(Done) February 19th 2025 Meetup: Causal Profiling

[frenchy64]

👍 to RSVP

https://madclj.com/

Wednesday, February 19th, 2025
6:30 PM to 9:00 PM CT

StartingBlock Madison
821 E Washington Ave 2nd floor · Madison, WI

• https://github.com/clojure-goes-fast/clj-async-profiler
• https://github.com/Byte-Lab/JCoz
• https://github.com/tonsky/fast-edn/
• https://github.com/hugoduncan/criterium/

Ideas:

• causal profiler based on clj-async-profiler
• pure clojure causal profiler based on https://github.com/taoensso/tufte
• adapt JCoz to clojure Profile non-Java JVM programs ByteLab-David/JCoz#23
• bench https://github.com/tonsky/fast-edn/ using JCoz
  • can we predict where clojure.edn reader is slow?
• summarize theory https://www.sigops.org/s/conferences/sosp/2015/current/2015-Monterey/printable/090-curtsinger.pdf
• existing discussion
  • https://www.reddit.com/r/Clojure/comments/kstuvl/anyone_tried_using_jcoz_java_causal_profiler_with/
  • https://clojureverse.org/t/avoiding-recursive-function-replacement-with-redefs-fn/5399/11

Organizer note:

• out of sparkling water

[frenchy64]

@madclj/meetup next meetup is about causal profiling. If you're keen to get involved or just want to hang out more, I've organized a planning lunch for January 21st.

[brunchboy]

I was really impressed with JCoz so this seems intriguing!

[frenchy64]

Yes! I have more questions than answers but also intrigued.

[sivakusayan]

The research this originates from seems cool :) I'm a big fan of Emery Berger's work in general, although I don't have the statistical background to appreciate his papers yet.

Only vaguely related, but this causal profiling stuff reminds me of a simulator called uiCA, which tries to predict how well small blocks of x86-64 code will perform on Intel CPUs. Another similar tool is llvm-mca.

[frenchy64]

@madclj/meetup there will be no meetup on Feb 12th due to weather. We will instead meet on Feb 19th.

[brookeswanson]

Stay safe and warm everyone!

[brunchboy]

Ah, rats, I just got back from buying ingredients to bake olive cheese nuggets and amaretto cookies for tonight! Hopefully I’ll be able to do that next week instead. 😸

[frenchy64]

Oh no!!

[brunchboy]

It’s all good! I baked half-scale recipes today, and brought them to the condo social, and will make them fresh again next week. The amaretto cookies were a hit, people took extras home and left none for us, so I am looking forward to it. 😄

[brunchboy]

[ericnormand]

I'll be there with my 2 kids.

[brunchboy]

Nice, I just started cooking. 😄

[frenchy64]

Anyone planning to be late please drop a note here with an ETA. It's too cold to be left outside.

I'm planning to be at the door at 6:30pm.

[frenchy64]

Pizza is ordered (a bit less than usual). Grabbing more drinks and snacks, see you all there!

[brunchboy]

I am aiming to be there right at 6:30 but if the amaretto cookies need a little extra baking time I may be a couple minutes late, in which case I’ll text you.

[sivakusayan]

We'll be there at 6:50ish!

[frenchy64]

• Paper
• coz
• Cannot reproduce plots
• coz.h
• JCoz profiling for non-Java languages
• coz with jank (and futures)
• coz toy.cpp
• coz visualizer (profile.coz from jank below)

Save this as profile.coz and upload to visualizer:

startup	time=1739937085108150079
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:21	speedup=1.00	duration=441594961	selected-samples=59
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=77
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:21	speedup=0.00	duration=500971950	selected-samples=52
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=62
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.00	duration=500825363	selected-samples=120
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=81
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.05	duration=497261492	selected-samples=101
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=85
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.75	duration=414669445	selected-samples=115
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=81
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.50	duration=440094045	selected-samples=125
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=81
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.70	duration=431267364	selected-samples=105
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=87
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:21	speedup=0.00	duration=505283392	selected-samples=41
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=87
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.55	duration=447731070	selected-samples=113
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=86
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.45	duration=470618528	selected-samples=72
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=67
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.35	duration=472826768	selected-samples=83
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=73
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:21	speedup=0.60	duration=470850917	selected-samples=51
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=54
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throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=49
runtime	time=6731119219
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samples	location=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:21	count=691
samples	location=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:29	count=3
samples	location=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:30	count=2
samples	location=/usr/include/c++/14/bits/std_thread.h:173	count=5
startup	time=1739937403102455350
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.80	duration=405621387	selected-samples=119
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=80
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:21	speedup=0.00	duration=505300824	selected-samples=59
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=70
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throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=77
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throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=85
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.80	duration=428391381	selected-samples=95
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experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.30	duration=470754454	selected-samples=102
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=83
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.30	duration=471738024	selected-samples=105
throughput-point	name=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:31	delta=86
experiment	selected=/home/ambrose/Projects/coz/benchmarks/toy/toy.cpp:17	speedup=0.60	duration=447774446	selected-samples=90
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samples	location=/usr/include/c++/14/bits/std_thread.h:173	count=2