cospaia

8 ms·

31.
by cospaia 5y ago
Thanks! I'll check JMH out now. Some week ago, while I thought the problem was todo with something in Clojure - https://twitter.com/pappapez/status/1486339518902984707?s=20... - I ran async-profiler via clj-a
32.
by cospaia 5y ago
I added this experiment, and the results (spoiler, it isn't getCurrentTimeMillis) here: https://github.com/PEZ/ghost-chase-condition/tree/master/tes...
33.
by cospaia 5y ago
Awesome. Would you consider adding this experiment to the repo? https://github.com/PEZ/ghost-chase-condition/tree/master/tes... Or, if that's a too big ask, just give me some hints how to do it, and
34.
by cospaia 5y ago
Haha, yes, you are reading correctly. To clarify: my employer bought the machine for me to have for this purpose. They know how grumpy I get with unsolved mysteries.
35.
by cospaia 5y ago
I've now made an experiment that removes System.currentTimeMillis() as a suspect: https://github.com/PEZ/ghost-chase-condition/tree/master/tes...
36.
by cospaia 5y ago
Thanks! I’ll try this when I’m at the computer.
37.
by cospaia 5y ago
This machine https://www.dustin.se/product/5011255694/mini-pc-pn51 Ubuntu, latest LTS. I bought the machine for this purpose. Guessing it was sufficiently similar to the machines running the benchmarks where I stu
38.
by cospaia 5y ago
Not certain. But there are a lot of implementations very similar to mine in tons of other languages and vms. None display this afaik. Also I get different behavior with JVM/JDK 7.
39.
by cospaia 5y ago
Yes, I should try to profile each run and compare the profiles of the bad and good ones. Would be quite funny if it's in the System.currentTimeMillis() call this happens. I'd try to figure out a way to remove that from the picture
40.
by cospaia 5y ago
It's a mini-pc. Could be throttling. There are benchmarks written in tons of languages here: https://github.com/PlummersSoftwareLLC/Primes I've so far only seen this behaviour with the JVM involved.
41.
by cospaia 5y ago
Yes, 1X, 0.5X are a bit arbitrary. I mean 1X as the speed I know it can run at. So it could well be that with JDK7 the optimizations could not happen and that the question then is why the optimizations do not always happen. Making each run
42.
by cospaia 5y ago
A datapoint I just discovered. On JDK7 the performance is stable at the 0.5X level. It starts to toggle between 0.5X and 1X on JDK8.
43.
Java BitSet performance-flicker mystery(blog.agical.se)
113 points by cospaia 5y ago|86 comments
44.
by cospaia 5y ago
I'm stumbling onto a strange Java performance irregularity, especially easy to hit with Docker on Linux. A super straightforward implementation of Eratosthenes sieve using a Java BitSet for storage, sometimes drops in performance by 50
45.
by cospaia 5y ago
You are on to something with ”behaviour”, ”actors”, and ”rational” . Ludwig von Mises defined ”rational” as ”aiming to an end, using means”. That means that even someone performing a dance to produce rain is a rational actor. He formulated
46.
by cospaia 5y ago
No, it can't be a science like physics. It is a science anyway. Just not like physics.
47.
I love being an open source developer, also when it is not butter smooth(twitter.com)
3 points by cospaia 5y ago|1 comments
48.
by cospaia 5y ago
A long Twitter thread about a non-lack of big problems, about parentheses, and about using git bisect to solve hard programming issues.
49.
by cospaia 5y ago
Thank you!
50.
by cospaia 5y ago
TL;DR: Two (OK, maybe three) clicks and you are evaluating Clojure code in a full blown editor environment running in your browser. And that's where you will start learning Clojure. Guides for beginners picking up Clojure often start w
51.
A REPL-driven, zero-install, Get Started with Clojure guide(calva.io)
19 points by cospaia 5y ago|3 comments
52.
by cospaia 7y ago
It would be lovely with a video demo of this!
53.
by cospaia 7y ago
It will depend on what features your workflow appreciates. Being the creator of Calva I am biased, of course, but it certainly supports my workflow. The big culprit right now is that Calva doesn't handle large results well at all. I fi