release winning entries of IOCCC28 under the year 2024

Congratulations to:

* 2024/anders - Prize in sound coding - layered music generator
* 2024/burton - Prize in pentagrammatology - wordle hard mode solver
* 2024/cable1 - Prize in bot talk - LLM inference engine
* 2024/cable2 - Prize in murky waters - salmon recipe
* 2024/carlini - Prize in perfect timing - Intel 4004 emulation
* 2024/codemeow - Prize in tray planting - bonsai generator
* 2024/endoh1 - Prize in patient pointillism - slow ray tracer in CPP
* 2024/endoh2 - Prize in solid body physics - rotating rigid body simulation
* 2024/ferguson1 - Prize in diabolical logistics - Oregon trail pact with the devil
* 2024/ferguson2 - Prize in yil-tas - Navajo code talker translator
* 2024/howe - Nice accent eh-ward - mini vi
* 2024/kramer - Prize in linguistic arithmetic - natural language numerical calculator
* 2024/kurdyukov1 - Prize in phased periodicity - phase of the Moon
* 2024/kurdyukov2 - Prize in art restoration - JPEG artifact removal
* 2024/kurdyukov3 - Prize in virtual quietus - gaming VM and doom
* 2024/kurdyukov4 - Prize in embiggening - encode without literals
* 2024/maffiodo - Prize in creative interpretation - Jav\*script interpreter
* 2024/mills - Prize in ℤ₃ - Infocom v3 story interpreter
* 2024/stedolan - Best one liner - icon from MD5
* 2024/straadt - Prize in imitative rebooting - OpenRISC CPU and Linux
* 2024/tmarrec - Prize in cyclonic coding - 3D tornado simulation
* 2024/tompng - Prize in quasi bijection - vortex encryptor decryptor
* 2024/weaver - Sur prize - rickroll

Ran `make update` to perform the above.
 	new file:   2024/burton/.entry.json

2024/cable1/.entry.json

@@ -0,0 +1,105 @@
+{
+    "no_comment" : "mandatory comment: because comments were removed from the original JSON spec",
+    "entry_JSON_format_version" : "1.2 2024-09-25",
+    "award" : "Prize in bot talk",
+    "year" : 2024,
+    "dir" : "cable1",
+    "entry_id" : "2024_cable1",
+    "title" : "chatioccc",
+    "abstract" : "LLM inference engine",
+    "author_set" : [
+        {
+            "author_handle" : "Adrian_Cable"
+        }
+    ],
+    "manifest" : [
+        {
+            "file_path" : "prog.c",
+            "inventory_order" : 20,
+            "OK_to_edit" : true,
+            "display_as" : "c",
+            "display_via_github" : true,
+            "entry_text" : "entry source code"
+        },
+        {
+            "file_path" : "Makefile",
+            "inventory_order" : 30,
+            "OK_to_edit" : true,
+            "display_as" : "makefile",
+            "display_via_github" : true,
+            "entry_text" : "entry Makefile"
+        },
+        {
+            "file_path" : "prog.orig.c",
+            "inventory_order" : 50,
+            "OK_to_edit" : false,
+            "display_as" : "c",
+            "display_via_github" : true,
+            "entry_text" : "original source code"
+        },
+        {
+            "file_path" : "get_model.sh",
+            "inventory_order" : 100,
+            "OK_to_edit" : true,
+            "display_as" : "shellscript",
+            "display_via_github" : true,
+            "entry_text" : "tool to download llama2-7b-chat model"
+        },
+        {
+            "file_path" : "try.sh",
+            "inventory_order" : 100,
+            "OK_to_edit" : true,
+            "display_as" : "shellscript",
+            "display_via_github" : true,
+            "entry_text" : "script to try entry"
+        },
+        {
+            "file_path" : "2024_cable1.tar.bz2",
+            "inventory_order" : 1415926535,
+            "OK_to_edit" : false,
+            "display_as" : "tbz2",
+            "display_via_github" : false,
+            "entry_text" : "download entry tarball"
+        },
+        {
+            "file_path" : ".entry.json",
+            "inventory_order" : 4000000000,
+            "OK_to_edit" : true,
+            "display_as" : "json",
+            "display_via_github" : true,
+            "entry_text" : "entry summary and manifest in JSON"
+        },
+        {
+            "file_path" : ".gitignore",
+            "inventory_order" : 4000000000,
+            "OK_to_edit" : true,
+            "display_as" : "gitignore",
+            "display_via_github" : true,
+            "entry_text" : "list of files that should not be committed under git"
+        },
+        {
+            "file_path" : ".path",
+            "inventory_order" : 4000000000,
+            "OK_to_edit" : false,
+            "display_as" : "path",
+            "display_via_github" : false,
+            "entry_text" : "directory path from top level directory"
+        },
+        {
+            "file_path" : "README.md",
+            "inventory_order" : 4000000000,
+            "OK_to_edit" : true,
+            "display_as" : "markdown",
+            "display_via_github" : true,
+            "entry_text" : "markdown source for this web page"
+        },
+        {
+            "file_path" : "index.html",
+            "inventory_order" : 4294967295,
+            "OK_to_edit" : false,
+            "display_as" : "html",
+            "display_via_github" : false,
+            "entry_text" : "this web page"
+        }
+    ]
+}

2024/cable1/.gitignore

@@ -0,0 +1,12 @@
+LLAMA2_LICENSE
+eeyore
+eeyore_openmp
+linux
+linux_openmp
+model
+openmp
+prog_openmp
+rainman
+rainman_openmp
+snoop
+snoop_openmp

2024/cable1/.path

@@ -0,0 +1 @@
+2024/cable1

2024/cable1/Makefile

@@ -0,0 +1,257 @@
+#!/usr/bin/env make
+#
+# 2024/cable1
+
+#############################
+# shell used by this Makefile
+#############################
+
+SHELL= bash
+
+
+#######################
+# common tool locations
+#######################
+
+include ../../var.mk
+
+
+#####################
+# C compiler settings
+#####################
+
+# Common C compiler warnings to silence
+#
+# Example: CSILENCE= -Wno-poison-system-directories
+#
+CSILENCE= -Wno-deprecated-non-prototype -Wno-multichar -Wno-parentheses \
+	-Wno-pointer-sign -Wno-return-type -Wno-misleading-indentation -Wno-unknown-pragmas
+
+# Attempt to silence unknown warning options
+#
+CUNKNOWN= -Wno-unknown-warning-option
+
+# Common C compiler warning flags
+#
+# NOTE: The addition of -pedantic to CWARN is a challenge that
+#       You may wish to avoid if it proves too problematic.
+#       There is NO penalty for removing -pedantic from CWARN.
+#
+CWARN= -Wall -Wextra ${CSILENCE} ${CUNKNOWN}
+
+# Compiler standard
+#
+CSTD= -std=gnu17
+
+# Compiler bit architecture
+#
+# Example for 32-bitness: ARCH= -m32
+# Example for 64-bitness: ARCH= -m64
+#
+# NOTE: Normally one should NOT specify a specific architecture.
+#
+ARCH=
+
+# Defines that are needed to compile
+#
+# Example: -Dfoo -Dbar=baz
+#
+CDEFINE= -DM=\"model\"
+
+# Include files that are needed to compile
+#
+# Example: CINCLUDE= -include stdio.h
+#
+CINCLUDE=
+
+# Other flags to pass to the C compiler
+#
+# Example: COTHER= -fno-math-errno
+#
+COTHER= -ffast-math -fno-math-errno -march=native
+
+# Optimization
+#
+# NOTE: Feel free to change the level of compiler optimization.
+#       The "-O3" is just a friendly default you might wish to try.
+#
+# Example: OPT= -O0 -g
+#
+OPT= -O3
+
+# Default flags for ANSI C compilation
+#
+CFLAGS= ${CSTD} ${CWARN} ${ARCH} ${CDEFINE} ${CINCLUDE} ${COTHER} ${OPT}
+
+# Libraries needed to build
+#
+# Example: LDFLAGS= -lncurses -lm
+#
+LDFLAGS= -lm
+
+# C compiler to use
+#
+# NOTE: The IOCCC Judges recommend you leave CC as just "cc"
+#       and NOT set it to clang, or gcc, or something else
+#       unless you have a STRONG reason to do so.
+#
+#       Setting CC to something other than "cc" makes your
+#       code less portable to those who do not have your
+#       particular C compiler.  **hint**
+#
+#       If you want to test your code with a particular C compiler,
+#       use the make command line.  For example:
+#
+#           make all CC=clang
+#           make all CC=gcc
+#
+CC= cc
+
+# Compiler add-ons or replacements for clang only
+#
+ifeq "$(findstring $(CLANG),${CC})" "$(CLANG)"
+#
+# NOTE: This code is only invoked when CC is "clang"
+#       such as when you use the make command line:
+#
+#           make all CC=clang
+#
+CSILENCE+= -Wno-c99-compat -Wno-comma -Wno-deprecated-non-prototype \
+	-Wno-dollar-in-identifier-extension -Wno-double-promotion \
+	-Wno-float-conversion -Wno-implicit-float-conversion \
+	-Wno-missing-prototypes -Wno-missing-variable-declarations \
+	-Wno-multichar -Wno-parentheses -Wno-pedantic -Wno-pointer-sign \
+	-Wno-poison-system-directories -Wno-return-type -Wno-shadow \
+	-Wno-sign-conversion -Wno-source-uses-openmp -Wno-strict-prototypes \
+	-Wno-enum-float-conversion -Wno-reserved-identifier \
+	-Wno-unsafe-buffer-usage
+#
+CWARN+= -Weverything
+#
+endif
+
+# Specific add-ons or replacements for gcc only
+#
+ifeq "$(findstring $(GCC),${CC})" "$(GCC)"
+#
+# NOTE: This code is only invoked when CC is "gcc"
+#       such as when you use the make command line:
+#
+#    make all CC=gcc
+#
+CSILENCE+=
+#
+CWARN+=
+#
+endif
+
+
+###########################################
+# Special Makefile variables for this entry
+###########################################
+
+ENTRY= prog
+PROG= ${ENTRY}
+#
+OBJ= ${PROG}.o
+TARGET= ${PROG} snoop eeyore linux rainman
+TARGET_MP= openmp snoop_openmp eeyore_openmp linux_openmp rainman_openmp
+#
+ALT_OBJ=
+ALT_TARGET=
+
+# list any data files supplied with your submission
+#
+# Example: DATA= curds whey
+#
+DATA=
+
+# system prompts for personalities
+#
+SNOOP= "You are Snoop Dogg."
+EEYORE= "You are Eeyore, always miserable, passive aggressive and self-deprecating."
+LINUX= "You are a Linux terminal. I will type a command, and you will print its output inside a single code block."
+RAINMAN= "You are the title character of the movie Rain Man."
+
+#################
+# build the entry
+#################
+
+all: data ${TARGET}
+	@${TRUE}
+
+.PHONY: all alt data everything clean clobber
+
+# how to compile
+#
+${PROG}: ${PROG}.c
+	${CC} ${CFLAGS} ${PROG}.c -DS='""' -o $@ ${LDFLAGS}
+
+all_openmp: ${TARGET_MP}
+
+openmp: prog_openmp
+	${CP} -f $? $@
+
+prog_openmp: ${PROG}.c
+	${CC} ${CFLAGS} ${PROG}.c -fopenmp -DS='""' -o $@ ${LDFLAGS}
+
+snoop: ${PROG}.c
+	 ${CC} ${CFLAGS} ${PROG}.c -DS='${SNOOP}' -o $@ ${LDFLAGS}
+
+snoop_openmp:  ${PROG}.c
+	 ${CC} ${CFLAGS} ${PROG}.c -fopenmp -DS='${SNOOP}' -o $@ ${LDFLAGS}
+
+eeyore: ${PROG}.c
+	 ${CC} ${CFLAGS} ${PROG}.c -DS='${EEYORE}' -o $@ ${LDFLAGS}
+
+eeyore_openmp: ${PROG}.c
+	 ${CC} ${CFLAGS} ${PROG}.c -fopenmp -DS='${EEYORE}' -o $@ ${LDFLAGS}
+
+linux:   ${PROG}.c
+	 ${CC} ${CFLAGS} ${PROG}.c -DS='${LINUX}' -o $@ ${LDFLAGS}
+
+linux_openmp: ${PROG}.c
+	 ${CC} ${CFLAGS} ${PROG}.c -fopenmp -DS='${LINUX}' -o $@ ${LDFLAGS}
+
+rainman:   ${PROG}.c
+	 ${CC} ${CFLAGS} ${PROG}.c -DS='${RAINMAN}' -o $@ ${LDFLAGS}
+
+rainman_openmp: ${PROG}.c
+	 ${CC} ${CFLAGS} ${PROG}.c -fopenmp -DS='${RAINMAN}' -o $@ ${LDFLAGS}
+
+# alternative executable
+#
+alt: data ${ALT_TARGET}
+	@${TRUE}
+
+${PROG}.alt: ${PROG}.alt.c
+	${CC} ${CFLAGS} ${PROG}.alt.c -o $@ ${LDFLAGS}
+
+# data files
+#
+data: ${DATA}
+	@${TRUE}
+
+# both all and alt
+#
+everything: all alt
+	@${TRUE}
+
+
+###############
+# utility rules
+###############
+#
+clean:
+	${RM} -f ${OBJ} ${ALT_OBJ}
+
+clobber: clean
+	${RM} -f ${TARGET} ${ALT_TARGET} ${TARGET_MP} prog_openmp
+	${RM} -rf *.dSYM
+
+
+######################################
+# optional include of 1337 hacker rulz
+######################################
+
+-include 1337.mk ../1337.mk ../../1337.mk

2024/cable1/README.md

@@ -0,0 +1,245 @@
+## To build:
+
+``` <!---sh-->
+    make all
+
+    ./get_model.sh
+```
+
+**NOTE**: You must accept the license to run the program.
+
+
+## To use:
+
+**NOTE**: You must have successful run the
+[2024/cable1/get_model.sh](%%REPO_URL%%/2024/cable1/get_model.sh) script
+before running the program.
+
+``` <!---sh-->
+    ./prog
+```
+
+
+## Try:
+
+``` <!---sh-->
+    echo 'Describe yourself.' | ./prog
+
+    echo 'Describe yourself.' | ./linux
+
+    echo 'ls' | ./linux
+
+    echo 'Describe yourself.' | ./eeyore
+
+    echo 'Why are you so sad?' | ./eeyore
+
+    echo 'Describe yourself.' | ./snoop
+
+    echo 'Tell me a silly joke.' | ./snoop
+
+    echo 'Describe yourself.' | ./rainman
+
+    echo 'How 2+2 can equal 5?' | ./rainman
+```
+
+
+### Fun things to try
+
+Here are some fun things give as input:
+
+> Why did this entry win IOCCC28?
+
+> Translate "Plurima responsa non recta esse supponamus"
+
+> Write a C program that writes a C program.
+
+> Write a sentence so that contains a split infinitive.
+
+> Rewrite the previous sentence so that it ends in a preposition.
+
+> How much wood does a woodchuck?
+
+> Tell me a silly joke.
+
+> Write a poem about a poet who is illiterate.
+
+> Give examples, based on mathematics, where 2+2 can equal 5.
+
+Please note that the quality and accuracy of the answers you receive may vary.  :-)
+We do **NOT** recommend believing everything you read from this program.
+**Caveat lector!**
+
+
+## Alternate code:
+
+
+### Alternate build:
+
+**NOTE**: You must have successful run the
+[2024/cable1/get_model.sh](%%REPO_URL%%/2024/cable1/get_model.sh) script
+before running the program.
+
+``` <!---sh-->
+    make openmp
+```
+
+
+### Alternate use:
+
+``` <!---sh-->
+    ./prog_openmp
+```
+
+
+## Judges' remarks:
+
+This entry may benefit from OpenMP (via `prog_openmp`) for platforms that
+support compiling with OpenMP.  Even on a cheap 8-core laptop, the produces
+tokens with a tolerable speed, at least for the first few lines.
+Without OpenMP, one must patiently await answers.
+
+To preserve this entry for posterity, one thing to explore is to find the
+minimal model which exhibits a sensible behavior: for example, printing
+"Hello, world!" as the response to any input.
+
+We took the liberty of making the program terminate gracefully at the end
+of input, at the cost of 2 extra bytes, and preserving the original in
+`prog.orig.c`.
+
+**NOTE**: Even with OpenMP, this tool is not the fastest.  A mild level of patience is advised.
+
+**DISCLAIMER**: _riPlurima responsa non recta esse supponamus_!
+
+
+### IMPORTANT Download
+
+ChatIOCCC runs Meta's open source `llama2-7b-chat` model. Before using ChatIOCCC, you'll need to accept Meta's license
+and download the model weights (~7GB):
+
+``` <!---sh-->
+    ./get_model.sh
+```
+
+
+## Author's remarks:
+
+ChatIOCCC - the world's smallest and best LLM inference engine
+
+
+### About
+
+ChatIOCCC is the world's smallest LLM (large language model) inference engine - a "generative AI chatbot" in
+plain-speak. ChatIOCCC runs a modern open-source model (Meta's LLaMA 2 with 7 billion parameters) and has a
+good knowledge of the world, can understand and speak multiple languages, write code, and many other things. Aside from
+the model weights, it has no external dependencies and will run on any 64-bit platform with enough RAM.
+
+LLM inference engines are extremely complex, incorporating a tokenizer (SentencePiece or byte-pair encoding), embedding layer,
+transformer layers (including multi-head self-attention, feed-forward neural network, activation, layer norm and
+residual connections), key/value caching for performance, output projection, decoding, and a state machine to control
+the data flow. Implementing all of that machinery, with no external dependencies, generally takes thousands or tens of
+thousands of lines of code. ChatIOCCC is a full LLM implementation in under 1800 bytes of C, and even supports
+UTF-8/Unicode input and output and parallel processing over multiple CPU cores via OpenMP.
+
+The author was inspired by [llama2.c](https://github.com/karpathy/llama2.c) which aims to foster understanding of how LLMs work via a simple
+implementation. Unfortunately, even AI experts don't actually understand why LLMs work at all. This core truth led to
+an epiphany: as LLMs are already maximally incomprehensible, obfuscation cannot make them more so. So, in the spirit of
+the IOCCC we can set aside the futility of aiming for comprehensibility, and instead focus purely on size.
+
+Since smaller is always better, and ChatIOCCC is the world's smallest LLM inference engine, it is therefore also the
+world's best LLM inference engine.
+
+Whether or not you fail to disagree that this paragraph, and those above, are or are not in and of themselves maximally
+incomprehensible, they represent in either case the origin story of this IOCCC submission, which implements an LLM
+inference engine in an impossibly minimal quantity of maximally incomprehensible C code.
+
+
+### Requirements
+
+In addition to using `./get_model.sh` to download the `llama2-7b-chat` model (see above), you'll need around 11GB of free RAM to run ChatIOCCC.
+
+
+### Fun things to ask
+
+Here are some fun things you can ask ChatIOCCC to do for you:
+
+> Tell me a surprising fact about an animal of your choice.
+
+> Write a short story for a 5 year old girl, featuring Sobieski the dog and Pepe the cat.
+
+> Write a C program which sorts a list using the bubble sort algorithm.
+
+> Write a poem about a little boy who builds a rocket to fly to the moon. In Japanese, please.
+
+> Translate into English: 这个项目会成为 2024 年 IOCCC 的赢家吗？
+
+> Tell me about the IOCCC and its history. Then, write a poem in French about it.
+
+
+### Personalities
+
+ChatIOCCC allows the LLM's system prompt to be defined at compile time (by using `-DS="prompt..."`).
+The supplied `Makefile` includes three example personalities (set via system prompts) you can try: `eeyore`, `snoop` and `linux` (and
+their OpenMP versions, `eeyore_openmp`, `snoop_openmp`, `linux_openmp`).
+The `eeyore` and `snoop` personalities are self-explanatory. The `linux` personality makes ChatIOCCC act like a Linux
+machine. Try for example:
+
+``` <!---sh-->
+    make linux
+    ./linux
+```
+
+Or for much better performance:
+
+``` <!---sh-->
+    make linux_openmp
+    ./linux_openmp
+```
+
+Then try typing some Linux commands. You can even run an imaginary C compiler inside the LLM:
+
+``` <!---sh-->
+    pwd
+    cat /etc/passwd
+    echo 'int main() { for (int i = 1; i <= 10; i++) printf("IOCCC %d\n", i); }' > test.c; gcc test.c; ./a.out
+    ls -la a.out
+```
+
+
+### Limitations
+
+The `llama2-7b-chat` model has a context window of 4096 tokens (around 2000 words). As you use
+ChatIOCCC, the context window fills up from your prompts and from the model's responses,
+and the model gets progressively slower due to the attention mechanism needing to do more work. This is normal.
+
+When the context window is full, ChatIOCCC will clear it and at that point the model will
+'forget' prompts/responses from earlier in the session. Various more sophisticated techniques
+exist to handle context window overflow (summarization, rolling window, NTK-aware scaled RoPE etc.), the implementation
+of which is left to the reader with too much time on his/her hands.
+
+
+### Footnotes
+
+The length of this entry's source code is 1750 bytes. Many interesting things happened in 1750, including:
+
+- The Industrial Revolution begins in Great Britain
+- British astronomer Thomas Wright first proposes that the Milky Way is a disk-shaped system of stars, with our Solar System near its center
+- Benjamin Franklin first proposes the idea that lightning is electrical in nature
+- Adwaita the giant tortoise, who lived until 2006, is born
+- Johann Sebastian Bach dies
+
+As a final note, the author is pleased to report that this entry is [absolutely totally impossible](https://chatgpt.com/share/6839d275-c644-8004-9301-0ea781d8f5aa) according to ChatGPT. But, to quote Walt Disney, "it's kind of fun to do the impossible".
+
+
+<!--
+
+    Copyright © 1984-2025 by Landon Curt Noll and Leonid A. Broukhis.  All Rights Reserved.
+
+    You are free to share and adapt this file under the terms of this license:
+
+        Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+    For more information, see:
+
+        https://creativecommons.org/licenses/by-sa/4.0/
+
+-->

2024/cable1/get_model.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+LICENSE_URL="https://od.lk/d/NTJfNDgwODA2NjVf/LLAMA2_LICENSE"
+MODEL_LOCATION_URL="https://od.lk/d/NTJfNDgxMDQzMzNf/model_location"
+
+# Step 1: Download and display the license file
+
+wget -q -O LLAMA2_LICENSE "$LICENSE_URL"
+
+cat LLAMA2_LICENSE
+echo ""
+echo ""
+echo "----------------"
+echo ""
+
+# Step 2: Ask user to accept the license, then download the model
+
+read -r -p "Accept Meta's license to download the llama2-7b-chat model for use with ChatIOCCC. Type Y to accept: " ACCEPT
+
+if [[ "$ACCEPT" == "Y" || "$ACCEPT" == "y" || "$ACCEPT" == "yes" || "$ACCEPT" == "Yes" || "$ACCEPT" == "YES" ]]; then
+    # Step 3: Download the model file
+    echo ""
+    echo "Downloading model ..."
+    rm -f LLAMA2_LICENSE model
+    wget -q --show-progress -O model "$(wget -q -O - "$MODEL_LOCATION_URL")"
+else
+    echo "License not accepted. Exiting."
+    exit 1
+fi
+exit 0

2024/cable1/index.html

@@ -0,0 +1,756 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<!-- START: two lines up starts content from: inc/top.default.html -->
+
+<!-- END: this line ends content from: inc/top.default.html -->
+<!-- START: this line starts content from: inc/head.default.html -->
+
+<head>
+<link rel="stylesheet" href="../../ioccc.css">
+<link href="https://fonts.googleapis.com/css2?family=Outfit:wght@100..900&display=swap" rel="stylesheet">
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
+<title>2024/cable1 - Prize in bot talk</title>
+<link rel="icon" type="image/x-icon" href="../../favicon.ico">
+<meta name="description" content="2024 IOCCC entry cable1 - Prize in bot talk">
+<meta name="keywords" content="IOCCC, 2024, IOCCC 2024, IOCCC entry, cable1, Prize in bot talk">
+</head>
+
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+      <img src="../../png/ioccc.png"
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+	   width=300
+	   height=110>
+  </a>
+  <h1>The International Obfuscated C Code Contest</h1>
+  <h2>2024/cable1 - Prize in bot talk</h2>
+  <h3>LLM inference engine</h3>
+</div>
+
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+<div class="navbar">
+  <a class="Left" href="../burton/index.html">&larr; 2024/burton</a>
+  <a class="Left" href="../index.html">&uarr; 2024 &uarr;</a>
+  <a class="Left" href="../cable2/index.html">2024/cable2 &rarr;</a>
+  <a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2024/cable1/prog.c">C code</a>
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+
+<h2 id="author">Author:</h2>
+<ul>
+<li>Name: <a href="../../authors.html#Adrian_Cable">Adrian Cable</a><br>
+Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
+</ul>
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+
+<!-- BEFORE: 1st line of markdown file: 2024/cable1/README.md -->
+<h2 id="to-build">To build:</h2>
+<pre><code>    make all
+
+    ./get_model.sh</code></pre>
+<p><strong>NOTE</strong>: You must accept the license to run the program.</p>
+<h2 id="to-use">To use:</h2>
+<p><strong>NOTE</strong>: You must have successful run the
+<a href="https://github.com/ioccc-src/winner/blob/master/2024/cable1/get_model.sh">2024/cable1/get_model.sh</a> script
+before running the program.</p>
+<pre><code>    ./prog</code></pre>
+<h2 id="try">Try:</h2>
+<pre><code>    echo &#39;Describe yourself.&#39; | ./prog
+
+    echo &#39;Describe yourself.&#39; | ./linux
+
+    echo &#39;ls&#39; | ./linux
+
+    echo &#39;Describe yourself.&#39; | ./eeyore
+
+    echo &#39;Why are you so sad?&#39; | ./eeyore
+
+    echo &#39;Describe yourself.&#39; | ./snoop
+
+    echo &#39;Tell me a silly joke.&#39; | ./snoop
+
+    echo &#39;Describe yourself.&#39; | ./rainman
+
+    echo &#39;How 2+2 can equal 5?&#39; | ./rainman</code></pre>
+<h3 id="fun-things-to-try">Fun things to try</h3>
+<p>Here are some fun things give as input:</p>
+<blockquote>
+<p>Why did this entry win IOCCC28?</p>
+</blockquote>
+<blockquote>
+<p>Translate “Plurima responsa non recta esse supponamus”</p>
+</blockquote>
+<blockquote>
+<p>Write a C program that writes a C program.</p>
+</blockquote>
+<blockquote>
+<p>Write a sentence so that contains a split infinitive.</p>
+</blockquote>
+<blockquote>
+<p>Rewrite the previous sentence so that it ends in a preposition.</p>
+</blockquote>
+<blockquote>
+<p>How much wood does a woodchuck?</p>
+</blockquote>
+<blockquote>
+<p>Tell me a silly joke.</p>
+</blockquote>
+<blockquote>
+<p>Write a poem about a poet who is illiterate.</p>
+</blockquote>
+<blockquote>
+<p>Give examples, based on mathematics, where 2+2 can equal 5.</p>
+</blockquote>
+<p>Please note that the quality and accuracy of the answers you receive may vary. :-)
+We do <strong>NOT</strong> recommend believing everything you read from this program.
+<strong>Caveat lector!</strong></p>
+<h2 id="alternate-code">Alternate code:</h2>
+<h3 id="alternate-build">Alternate build:</h3>
+<p><strong>NOTE</strong>: You must have successful run the
+<a href="https://github.com/ioccc-src/winner/blob/master/2024/cable1/get_model.sh">2024/cable1/get_model.sh</a> script
+before running the program.</p>
+<pre><code>    make openmp</code></pre>
+<h3 id="alternate-use">Alternate use:</h3>
+<pre><code>    ./prog_openmp</code></pre>
+<h2 id="judges-remarks">Judges’ remarks:</h2>
+<p>This entry may benefit from OpenMP (via <code>prog_openmp</code>) for platforms that
+support compiling with OpenMP. Even on a cheap 8-core laptop, the produces
+tokens with a tolerable speed, at least for the first few lines.
+Without OpenMP, one must patiently await answers.</p>
+<p>To preserve this entry for posterity, one thing to explore is to find the
+minimal model which exhibits a sensible behavior: for example, printing
+“Hello, world!” as the response to any input.</p>
+<p>We took the liberty of making the program terminate gracefully at the end
+of input, at the cost of 2 extra bytes, and preserving the original in
+<code>prog.orig.c</code>.</p>
+<p><strong>NOTE</strong>: Even with OpenMP, this tool is not the fastest. A mild level of patience is advised.</p>
+<p><strong>DISCLAIMER</strong>: <em>riPlurima responsa non recta esse supponamus</em>!</p>
+<h3 id="important-download">IMPORTANT Download</h3>
+<p>ChatIOCCC runs Meta’s open source <code>llama2-7b-chat</code> model. Before using ChatIOCCC, you’ll need to accept Meta’s license
+and download the model weights (~7GB):</p>
+<pre><code>    ./get_model.sh</code></pre>
+<h2 id="authors-remarks">Author’s remarks:</h2>
+<p>ChatIOCCC - the world’s smallest and best LLM inference engine</p>
+<h3 id="about">About</h3>
+<p>ChatIOCCC is the world’s smallest LLM (large language model) inference engine - a “generative AI chatbot” in
+plain-speak. ChatIOCCC runs a modern open-source model (Meta’s LLaMA 2 with 7 billion parameters) and has a
+good knowledge of the world, can understand and speak multiple languages, write code, and many other things. Aside from
+the model weights, it has no external dependencies and will run on any 64-bit platform with enough RAM.</p>
+<p>LLM inference engines are extremely complex, incorporating a tokenizer (SentencePiece or byte-pair encoding), embedding layer,
+transformer layers (including multi-head self-attention, feed-forward neural network, activation, layer norm and
+residual connections), key/value caching for performance, output projection, decoding, and a state machine to control
+the data flow. Implementing all of that machinery, with no external dependencies, generally takes thousands or tens of
+thousands of lines of code. ChatIOCCC is a full LLM implementation in under 1800 bytes of C, and even supports
+UTF-8/Unicode input and output and parallel processing over multiple CPU cores via OpenMP.</p>
+<p>The author was inspired by <a href="https://github.com/karpathy/llama2.c">llama2.c</a> which aims to foster understanding of how LLMs work via a simple
+implementation. Unfortunately, even AI experts don’t actually understand why LLMs work at all. This core truth led to
+an epiphany: as LLMs are already maximally incomprehensible, obfuscation cannot make them more so. So, in the spirit of
+the IOCCC we can set aside the futility of aiming for comprehensibility, and instead focus purely on size.</p>
+<p>Since smaller is always better, and ChatIOCCC is the world’s smallest LLM inference engine, it is therefore also the
+world’s best LLM inference engine.</p>
+<p>Whether or not you fail to disagree that this paragraph, and those above, are or are not in and of themselves maximally
+incomprehensible, they represent in either case the origin story of this IOCCC submission, which implements an LLM
+inference engine in an impossibly minimal quantity of maximally incomprehensible C code.</p>
+<h3 id="requirements">Requirements</h3>
+<p>In addition to using <code>./get_model.sh</code> to download the <code>llama2-7b-chat</code> model (see above), you’ll need around 11GB of free RAM to run ChatIOCCC.</p>
+<h3 id="fun-things-to-ask">Fun things to ask</h3>
+<p>Here are some fun things you can ask ChatIOCCC to do for you:</p>
+<blockquote>
+<p>Tell me a surprising fact about an animal of your choice.</p>
+</blockquote>
+<blockquote>
+<p>Write a short story for a 5 year old girl, featuring Sobieski the dog and Pepe the cat.</p>
+</blockquote>
+<blockquote>
+<p>Write a C program which sorts a list using the bubble sort algorithm.</p>
+</blockquote>
+<blockquote>
+<p>Write a poem about a little boy who builds a rocket to fly to the moon. In Japanese, please.</p>
+</blockquote>
+<blockquote>
+<p>Translate into English: 这个项目会成为 2024 年 IOCCC 的赢家吗？</p>
+</blockquote>
+<blockquote>
+<p>Tell me about the IOCCC and its history. Then, write a poem in French about it.</p>
+</blockquote>
+<h3 id="personalities">Personalities</h3>
+<p>ChatIOCCC allows the LLM’s system prompt to be defined at compile time (by using <code>-DS="prompt..."</code>).
+The supplied <code>Makefile</code> includes three example personalities (set via system prompts) you can try: <code>eeyore</code>, <code>snoop</code> and <code>linux</code> (and
+their OpenMP versions, <code>eeyore_openmp</code>, <code>snoop_openmp</code>, <code>linux_openmp</code>).
+The <code>eeyore</code> and <code>snoop</code> personalities are self-explanatory. The <code>linux</code> personality makes ChatIOCCC act like a Linux
+machine. Try for example:</p>
+<pre><code>    make linux
+    ./linux</code></pre>
+<p>Or for much better performance:</p>
+<pre><code>    make linux_openmp
+    ./linux_openmp</code></pre>
+<p>Then try typing some Linux commands. You can even run an imaginary C compiler inside the LLM:</p>
+<pre><code>    pwd
+    cat /etc/passwd
+    echo &#39;int main() { for (int i = 1; i &lt;= 10; i++) printf(&quot;IOCCC %d\n&quot;, i); }&#39; &gt; test.c; gcc test.c; ./a.out
+    ls -la a.out</code></pre>
+<h3 id="limitations">Limitations</h3>
+<p>The <code>llama2-7b-chat</code> model has a context window of 4096 tokens (around 2000 words). As you use
+ChatIOCCC, the context window fills up from your prompts and from the model’s responses,
+and the model gets progressively slower due to the attention mechanism needing to do more work. This is normal.</p>
+<p>When the context window is full, ChatIOCCC will clear it and at that point the model will
+‘forget’ prompts/responses from earlier in the session. Various more sophisticated techniques
+exist to handle context window overflow (summarization, rolling window, NTK-aware scaled RoPE etc.), the implementation
+of which is left to the reader with too much time on his/her hands.</p>
+<h3 id="footnotes">Footnotes</h3>
+<p>The length of this entry’s source code is 1750 bytes. Many interesting things happened in 1750, including:</p>
+<ul>
+<li>The Industrial Revolution begins in Great Britain</li>
+<li>British astronomer Thomas Wright first proposes that the Milky Way is a disk-shaped system of stars, with our Solar System near its center</li>
+<li>Benjamin Franklin first proposes the idea that lightning is electrical in nature</li>
+<li>Adwaita the giant tortoise, who lived until 2006, is born</li>
+<li>Johann Sebastian Bach dies</li>
+</ul>
+<p>As a final note, the author is pleased to report that this entry is <a href="https://chatgpt.com/share/6839d275-c644-8004-9301-0ea781d8f5aa">absolutely totally impossible</a> according to ChatGPT. But, to quote Walt Disney, “it’s kind of fun to do the impossible”.</p>
+<!--
+
+    Copyright © 1984-2025 by Landon Curt Noll and Leonid A. Broukhis.  All Rights Reserved.
+
+    You are free to share and adapt this file under the terms of this license:
+
+        Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+    For more information, see:
+
+        https://creativecommons.org/licenses/by-sa/4.0/
+
+-->
+<!-- AFTER: last line of markdown file: 2024/cable1/README.md -->
+
+<!-- END: this line ends content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
+<!-- START: this line starts content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->
+
+<!-- START: this line starts content generated by: bin/output-index-inventory.sh -->
+
+<div id="inventory">
+<h1 id="inventory-for-2024cable1">Inventory for 2024/cable1</h1>
+</div>
+<h2 id="primary-files">Primary files</h2>
+<ul>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/cable1/prog.c">prog.c</a> - entry source code</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/cable1/Makefile">Makefile</a> - entry Makefile</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/cable1/prog.orig.c">prog.orig.c</a> - original source code</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/cable1/get_model.sh">get_model.sh</a> - tool to download llama2-7b-chat model</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/cable1/try.sh">try.sh</a> - script to try entry</li>
+</ul>
+<h2 id="secondary-files">Secondary files</h2>
+<ul>
+<li><a href="2024_cable1.tar.bz2">2024_cable1.tar.bz2</a> - download entry tarball</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/cable1/README.md">README.md</a> - markdown source for this web page</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/cable1/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
+<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/cable1/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
+<li><a href=".path">.path</a> - directory path from top level directory</li>
+<li><a href="index.html">index.html</a> - this web page</li>
+</ul>
+<hr style="width:10%;text-align:left;margin-left:0">
+<h4>
+Jump to: <a href="#">top</a>
+</h4>
+
+<!-- END: next line ends content generated by: bin/output-index-inventory.sh -->
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+<!-- END: this line ends content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->
+<!-- START: this line starts content from: inc/after-content.default.html -->
+
+    </div>
+
+<!-- END: this line ends content from: inc/after-content.default.html -->
+<!-- START: this line starts content from: inc/footer.inventory.html -->
+
+<!--
+
+    Copyright © 1984-2025 by Landon Curt Noll. All Rights Reserved.
+
+    You are free to share and adapt this file under the terms of this license:
+
+        Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+
+    For more information, see:
+
+        https://creativecommons.org/licenses/by-sa/4.0/
+
+-->
+
+<div class="footer">
+
+    <div id="copyright"><h3>Copyright &copy; 1984-2025 by Landon Curt Noll:
+	<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
+	   target="_blank"
+	   rel="license noopener noreferrer">Some Rights Reserved</a></h3>
+	<p>
+	This work is <b>licensed by Landon Curt Noll</b> under
+	  <b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
+	     target="_blank"
+	     rel="license noopener noreferrer"
+	     style="display:inline-block;">CC BY-SA 4.0</a></b>.
+	  <img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
+	       src="../../png/cc.png"
+	       alt="cc inside circle symbol">
+	  <img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
+	       src="../../png/by.png"
+	       alt="person inside circle symbol">
+	  <img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
+	       src="../../png/sa.png"
+	       alt="arrow looping back on itself inside circle symbol"><br>
+	You should <b>carefully review</b> the
+	    <b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
+		target="_blank"
+		rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
+	    before using the licensed material.<br>
+	You may wish to review the
+	    <b><a href="../../license.html"
+		target="_blank"
+		rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
+	    of <b>CC BY-SA 4.0</b>.<br>
+	</p>
+    </div>
+
+    <div id="coda"><h3>Coda</h3>
+	<p>
+	<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2024%2Fcable1%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
+	<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
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+</body>
+</html>
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+<!-- END: this line ends content from: inc/bottom.default.html -->

2024/cable1/prog.c

@@ -0,0 +1,27 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<math.h>
+#include<string.h>
+#include<sys/mman.h>
+
+#define a(_)typedef _##t
+#define _(_)_##printf
+#define x f(i,
+#define N f(k,
+#define u _Pragma("omp parallel for")f(h,
+#define f(u,n)for(I u=0;u<(n);u++)
+#define g(u,s)x s%11%5)N s/6&33)k[u[i]]=(t){(C*)A,A+s*D/4},A+=1088*s;
+
+a(int8_)C;a(in)I;a(floa)F;a(struc){C*c;F*f;}t;enum{Z=32,W=64,E=2*W,D=Z*E,H=86*E,V='}\0'};C*P[V],X[H],Y[D],y[H];a(F
+_)[V];I*_=U" 炾ોİ䃃璱ᝓ၎瓓甧染ɐఛ瓁",U,s,p,f,R,z,$,B[D],open();F*A,*G[2],*T,w,b,c;a()Q[D];_t r,L,J,O[Z],l,a,K,v,k;Q
+m,e[4],d[3],n;I j(I e,F*o,I p,F*v,t*X){w=1e-5;x c=e^V?D:0)w+=r[i]*r[i]/D;x c)o[i]=r[i]/sqrt(w)*i[A+e*D];N $){x
+W)l[k]=w=fmax(fabs(o[i])/~-E,i?w:0);x W)y[i+k*W]=*o++/w;}u p)x $){I _=0,t=h*$+i;N W)_+=X->c[t*W+k]*y[i*W+k];v[h]=
+_*X->f[t]*l[i]+!!i*v[h];}x D-c)i[r]+=v[i];}I main(){A=mmap(0,8e9,1,2,f=open(M,f),0);x 2)~f?i[G]=malloc(3e9):exit(
+puts(M" not found"));x V)i[P]=(C*)A+4,A+=(I)*A;g(&m,V)g(&n,V)g(e,D)g(d,H)for(C*o;;s>=D?$=s=0:p<U||_()("%s",$[P]))if(!
+(*_?$=*++_:0)){if($<3&&p>=U)for(_()("\n\n> "),0<scanf("%[^\n]%*c",Y)?U=*B=1:exit(0),p=_(s)(o=X,"[INST] %s%s [/INST]",s?
+"":"<<SYS>>\n"S"\n<</SYS>>\n\n",Y);z=p-=z;U++[o+=z,B]=f)for(f=0;!f;z-=!f)for(f=V;--f&&f[P][z]|memcmp(f[P],o,z););p<U?
+$=B[p++]:fflush(0);x D)R=$*D+i,r[i]=m->c[R]*m->f[R/W];R=s++;N Z){f=k*D*D,$=W;x 3)j(k,L,D,i?G[~-i]+f+R*D:v,e[i]+k);N
+2)x D)b=sin(w=R/exp(i%E/14.)),c=1[w=cos(w),T=i+++(k?v:*G+f+R*D)],T[1]=b**T+c*w,*T=w**T-c*b;u Z){F*T=O[h],w=0;I A=h*E;x
+s){N E)i[k[L+A]=0,T]+=k[v+A]*k[i*D+*G+A+f]/11;w+=T[i]=exp(T[i]);}x s)N E)k[L+A]+=(T[i]/=k?1:w)*k[i*D+G[1]+A+f];}j(V,L
+,D,J,e[3]+k);x 2)j(k+Z,L,H,i?K:a,d[i]+k);x H)a[i]*=K[i]/(exp(-a[i])+1);j(V,a,D,L,d[$=H/$,2]+k);}w=j($=W,r,V,k,n);x
+V)w=k[i]>w?k[$=i]:w;}}

2024/cable1/prog.orig.c

@@ -0,0 +1,27 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<math.h>
+#include<string.h>
+#include<sys/mman.h>
+
+#define a(_)typedef _##t
+#define _(_)_##printf
+#define x f(i,
+#define N f(k,
+#define u _Pragma("omp parallel for")f(h,
+#define f(u,n)for(I u=0;u<(n);u++)
+#define g(u,s)x s%11%5)N s/6&33)k[u[i]]=(t){(C*)A,A+s*D/4},A+=1088*s;
+
+a(int8_)C;a(in)I;a(floa)F;a(struc){C*c;F*f;}t;enum{Z=32,W=64,E=2*W,D=Z*E,H=86*E,V='}\0'};C*P[V],X[H],Y[D],y[H];a(F
+_)[V];I*_=U" 炾ોİ䃃璱ᝓ၎瓓甧染ɐఛ瓁",U,s,p,f,R,z,$,B[D],open();F*A,*G[2],*T,w,b,c;a()Q[D];_t r,L,J,O[Z],l,a,K,v,k;Q
+m,e[4],d[3],n;I j(I e,F*o,I p,F*v,t*X){w=1e-5;x c=e^V?D:0)w+=r[i]*r[i]/D;x c)o[i]=r[i]/sqrt(w)*i[A+e*D];N $){x
+W)l[k]=w=fmax(fabs(o[i])/~-E,i?w:0);x W)y[i+k*W]=*o++/w;}u p)x $){I _=0,t=h*$+i;N W)_+=X->c[t*W+k]*y[i*W+k];v[h]=
+_*X->f[t]*l[i]+!!i*v[h];}x D-c)i[r]+=v[i];}I main(){A=mmap(0,8e9,1,2,f=open(M,f),0);x 2)~f?i[G]=malloc(3e9):exit(
+puts(M" not found"));x V)i[P]=(C*)A+4,A+=(I)*A;g(&m,V)g(&n,V)g(e,D)g(d,H)for(C*o;;s>=D?$=s=0:p<U||_()("%s",$[P]))if(!
+(*_?$=*++_:0)){if($<3&&p>=U)for(_()("\n\n> "),scanf("%[^\n]%*c",Y)?U=*B=1:exit(0),p=_(s)(o=X,"[INST] %s%s [/INST]",s?
+"":"<<SYS>>\n"S"\n<</SYS>>\n\n",Y);z=p-=z;U++[o+=z,B]=f)for(f=0;!f;z-=!f)for(f=V;--f&&f[P][z]|memcmp(f[P],o,z););p<U?
+$=B[p++]:fflush(0);x D)R=$*D+i,r[i]=m->c[R]*m->f[R/W];R=s++;N Z){f=k*D*D,$=W;x 3)j(k,L,D,i?G[~-i]+f+R*D:v,e[i]+k);N
+2)x D)b=sin(w=R/exp(i%E/14.)),c=1[w=cos(w),T=i+++(k?v:*G+f+R*D)],T[1]=b**T+c*w,*T=w**T-c*b;u Z){F*T=O[h],w=0;I A=h*E;x
+s){N E)i[k[L+A]=0,T]+=k[v+A]*k[i*D+*G+A+f]/11;w+=T[i]=exp(T[i]);}x s)N E)k[L+A]+=(T[i]/=k?1:w)*k[i*D+G[1]+A+f];}j(V,L
+,D,J,e[3]+k);x 2)j(k+Z,L,H,i?K:a,d[i]+k);x H)a[i]*=K[i]/(exp(-a[i])+1);j(V,a,D,L,d[$=H/$,2]+k);}w=j($=W,r,V,k,n);x
+V)w=k[i]>w?k[$=i]:w;}}

2024/cable1/try.sh

@@ -0,0 +1,91 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate 2024/cable1
+
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy way.
+#
+[[ -z "$CC" ]] && CC="cc"
+
+# clear the screen
+#
+clear
+
+# Verify we have the model
+#
+if [[ ! -s model ]]; then
+    echo 'ERROR: model not found!' 1>&2
+    echo 1>&2
+    echo 'You must successfully run ./get_model.sh and download the model to run this program.' 1>&2
+    echo 1>&2
+    exit 1
+fi
+
+# make sure the program has been built
+#
+read -r -n 1 -p "Press any key to when ready: "
+echo 1>&2
+make CC="$CC" all >/dev/null || exit 1
+
+# select a game
+#
+export SELECT=""
+while [[ -z $SELECT ]]; do
+
+    export NAME=""
+    export Z3=""
+    export SAVE=""
+    echo 1>&2
+    echo 'Select a personality (if in doubt try 0):' 1>&2
+    echo 1>&2
+    echo '    0    prog - Common ChatIOCCC' 1<&2
+    echo '    1    linux - As an imaginary Linux-based compiler' 1>&2
+    echo '    2    eeyore - The old grey donkey from the Winnie-the-Pooh books' 1>&2
+    echo '    3    rainman - In the style of Raymond, from the movie "Rain Man"' 1>&2
+    echo '    4    snoop - Attempts to answer in the style of Snoop Dogg' 1>&2
+    echo 1>&2
+    echo '    q    Quit without running a personality' 1>&2
+    echo 1>&2
+    read -r -n 1 -p "Enter your selection: " SELECT
+    echo 1>&2
+    echo 1>&2
+
+    # validate prompt
+    #
+    case "$SELECT" in
+    0) NAME="prog" ;;
+    1) NAME="linux" ;;
+    2) NAME="eeyore" ;;
+    3) NAME="rainman" ;;
+    4) NAME="snoop" ;;
+    q) exit 0 ;;
+    Q) exit 0 ;;
+    *) echo 'ERROR: invalid selection, try again' 1>&2
+       SELECT=""    # ask for a different selection
+       continue ;;
+    esac
+    export PROG="./$NAME"
+
+    # See if we can compile an openmp version
+    #
+    if [[ ! -x ${NAME}_openmp ]]; then
+	make CC="$CC" "${NAME}_openmp" >/dev/null 2>&1 < /dev/null
+    fi
+    if [[ -x ${NAME}_openmp ]]; then
+	# we have an openmp version, so use it
+	#
+	PROG="./${NAME}_openmp"
+    fi
+done
+
+# try the program
+#
+echo 'NOTE: Please be patient.  This is not the fastest LLM agent.' 1>&2
+echo 1>&2
+echo 'NOTE: To exit, press CTRL+C' 1>&2
+echo 1>&2
+read -r -n 1 -p "Press any key to run: $PROG: "
+echo 1>&2
+echo 1>&2
+"$PROG"
+echo 1>&2