Doug

@switchology

Trading software engineer interested in high performance Java, distributed latency sensitive realtime systems... coffee and penguins

England
flickr.com/photos/switcho…
Vrijeme pridruživanja: siječanj 2009.
26 fotografija ili videozapisa Fotografije i videozapisi

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  1. 4. stu 2019.

    Old article but compressed oops can be a gotcha!

    1 korisnik označava da mu se sviđa
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  2. proslijedio/la je Tweet
    19. lis 2019.

    I hope this presentation will answer many questions about excessive memory usage of a Java process. How to find where large RSS comes from, how to monitor native memory consumption and how to profile off-heap allocations.

    Memory Footprint of a Java Process by Andrei Pangin
    67 proslijeđenih tweetova 181 korisnik označava da mu se sviđa
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  3. proslijedio/la je Tweet
    2. kol 2019.

    People fighting against "gender identity" on biological grounds need to get better hobbies. I don't care if you identify as a watermelon as long as you run tests before you submit your PR.

    6 replies 9 proslijeđenih tweetova 79 korisnika označava da im se sviđa
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  4. 29. srp 2019.

    Recently we were looking at why a process, whose parent exited and was reparented appears to run but crashes immediately after writing to stdout.. anyway I found this article on how the TTY driver works. I would thoroughly recommend it:

    3 korisnika označavaju da im se sviđa
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  5. 15. srp 2019.

    One of the best things I've learnt professionally, that has been applied to my hobby projects, is ruthless scoping, followed by descoping, and more descoping until all that remains is the minimal effort necessary for a project!

    2 korisnika označavaju da im se sviđa
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  6. proslijedio/la je Tweet
    10. srp 2019.

    Flame graphs are now also in IntelliJ, with integration with Java Flight Recorder and Async profiler

    58 proslijeđenih tweetova 142 korisnika označavaju da im se sviđa
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  7. proslijedio/la je Tweet
    10. srp 2019.

    I reimplemented the attach API for HotSpot on POSIX and now I am trying to do the same for OpenJ9. Once completed, I want to do the same for Win32. This way, you can attach using any JVM and self-attach from the same process. Would love to get this out but my C is rusty. Thanks!

    Alright, anybody who is (a) good at C, (b) decent at Java, (c) has a minute. Why does my Semaphore code not work: - compared to:
    1 proslijeđeni tweet 11 korisnika označava da im se sviđa
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  8. 5. srp 2019.

    Great article on various classes of performance optimisation. A new one to me was bypass delays that come into affect when switching between int, floating point and vector arithmetic. Agner Fog has more info

    1 reply 2 proslijeđena tweeta 12 korisnika označava da im se sviđa
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  9. 9. lip 2019.

    For anyone looking to compile JDK 11 or 12 hsdis (the hotspot disassembler) on Linux:

    1 reply 4 proslijeđena tweeta 10 korisnika označava da im se sviđa
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  10. 28. svi 2019.

    Interesting paper on an compression scheme for heap objects. There's a number of cool ideas in that paper and Hotpads are a new technology to me. Paper on Hotpads:

    1 proslijeđeni tweet 8 korisnika označava da im se sviđa
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  11. proslijedio/la je Tweet
    18. tra 2019.

    Forget your CS degree (but you already have, right?), read Code Complete NOW. You'll relearn bits of your degree if/when relevant, right now you need to skill up on the profession. Oh, and welcome to the shitshow!

    What's one piece of advice you'd give to new coders?
    5 proslijeđenih tweetova 21 korisnik označava da mu se sviđa
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  12. proslijedio/la je Tweet
    27. stu 2018.

    Probably my favourite bit of The Thick Of It ever...

    629 replies 8.974 proslijeđena tweeta 24.830 korisnika označava da im se sviđa
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  13. proslijedio/la je Tweet
    27. stu 2018.

    0.5 () is released:

    6 proslijeđenih tweetova 8 korisnika označava da im se sviđa
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  14. 28. lis 2018.

    Tonight I have been mostly been revising 'strong' consistency models "Sequential Consistency versus Linearizability" by

    2 korisnika označavaju da im se sviđa
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  15. proslijedio/la je Tweet
    19. lis 2018.
    Odgovor korisniku/ci

    Well, that's tricky. You will take some additional space per-object, and it is then the question how many objects do you have. We estimated ~5-10% is spent on fwdptrs in usual workloads. Larger objects (e.g. in-memory cache full of byte[]-s)? Overhead goes closer to zero.

    1 reply 2 proslijeđena tweeta
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  16. proslijedio/la je Tweet
    14. lis 2018.

    : Characterizing Latency, Throughput, and Port Usage of Instructions on Intel Microarchitectures (PDF)

    6 proslijeđenih tweetova 5 korisnika označava da im se sviđa
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  17. proslijedio/la je Tweet
    12. lis 2018.

    Celebrating their First Day of Trading rings the NYSE Opening Bell

    43 proslijeđena tweeta 65 korisnika označava da im se sviđa
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  18. 29. ruj 2018.

    Yes sir, my servers are UTC

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  19. 29. ruj 2018.

    I found this little gem today: See also Very cool for those interested in garbage collectors

    10 proslijeđenih tweetova 22 korisnika označavaju da im se sviđa
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  20. proslijedio/la je Tweet
    27. ruj 2018.

    Ok, quick read of ZGC and it basically screams "GPGC done by Oracle". Can anybody closer to the truth fill in any details?

    6 proslijeđenih tweetova 14 korisnika označava da im se sviđa
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