I'm on JDK17 atm

I should run my server benchmarks on it :thinking_face:

that would be interesting

I do wonder with benchmarks how much of it depends upon your usecase. I'm doing all batchy/interactive repl stuff using tablecloth and tech.ml.dataset and I've not really got a good idea if it pushes the garbage collector in different ways than other apps (say web apps). I suppose I really ought to profile stuff more.

it is nice to get some perf for free when you can tho 😉

In that sense you should always upgrade your jdk

The interesting question for Clojure is which JIT compiler you should use, C2 or Graal

interesting. I've been using ZGC, but this makes me think I should be using something else

That's for GC, are you tuning for throughput or responsiveness? JIT compilers are orthogonal to that. Highly polymorphic and dynamic code, like Scala and Clojure, seems to benefit more from GraalVMs JIT compiler

sorry, too sleepy to read your response properly

I should be tuning for throughput as the actual java bits that execute are always batchy

looking at this makes me think I should use the G1 collector https://docs.oracle.com/en/java/javase/21/gctuning/available-collectors.html#GUID-C7B19628-27BA-4945-9004-EC0F08C76003

or (reading further down) ParallelGC

Parallel GC is optimized for throughput Shenandoah and ZGC are optimized for responsiveness (short pauses up to no pauses) G1 is a happy median You should use G1 (the default) and profile if you have issues.

thx!

JFR is an excellent tool in debugging these problems. It will yell at you you're doing too many GCs or have long pauses

So download Java Mission Control, attach to your REPL's JVM, and start recording 😄

does running data science code on my own machine (for clients) count as "production"?

Probably

You're dealing with long running computations on your machine? Then Parallel GC might be a better choice

Long running - more than a few seconds

long running being a few minutes of wall clock time

so sounds like ParallelGC might be good for me

Yes. But measure 🙂

Lein repl or deps?

Deps

At these speeds I can measure with time and that reflects how they get used as well as I do all my work in a repl

Yes

You should use clj-async-profiler, too, maybe you'll find some easy fixes

I should.

Beautiful

Seems like your dog is keeping a very close eye on your mbp...ready to pounce if it even dares beep or move!

😄 he's mostly interested in the ball on the table

What a view 😎

Is that in Spain?

Nope - in Italy, Biellese Alps