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ubernostrum's profile
James Bennett
James Bennett
James Bennett
@ubernostrum

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James Bennett

@ubernostrum

The man with the plan and the pocket comb.

The green fields of the mind
b-list.org
Joined June 2007

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    James Bennett‏ @ubernostrum 11 Sep 2019
    • Report Tweet

    Today I learned: Python’s concurrency-safe queue structures have a hard limit of 32,768 items. I totally did not deadlock a piece of code by not paying attention to that, why do you ask?

    9:18 AM - 11 Sep 2019
    • 18 Retweets
    • 68 Likes
    • Harpreetjot Mann Vadim Shumilin electrochemistry GAURAV 🐍 filipe fernandes wahome Руслан Nick Fishman Michael Herman
    3 replies 18 retweets 68 likes
      1. New conversation
      2. James Bennett‏ @ubernostrum 11 Sep 2019
        • Report Tweet

        And to stave off some questions: I wasn’t paying attention to it because the documentation states that if “maxsize is less than or equal to zero, the queue size is infinite”. I did not in fact assume “infinite”. But did assume > 32,768. Which turned out to be naïve.

        1 reply 0 retweets 5 likes
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      3. James Bennett‏ @ubernostrum 11 Sep 2019
        • Report Tweet

        Debugging it was a fun story, too. At first I thought it was something else stalling out (since all the failures happened at suspicious powers of 2). Eventually isolated just the queue setup and saw it start to block put() at 32,768 items.

        1 reply 1 retweet 3 likes
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      4. James Bennett‏ @ubernostrum 11 Sep 2019
        • Report Tweet

        So then I tried creating a queue with a higher maxsize, and got an immediate exception saying that’s not allowed. Turns out to be a hard-coded limit. Perhaps this should be documented better.

        2 replies 0 retweets 2 likes
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      5. James Bennett‏ @ubernostrum 11 Sep 2019
        • Report Tweet

        (it’s not entirely Python’s fault, since this is actually handed off to system-specific non-Python semaphore implementations, and that’s where the hard-coded limit actually lives, but still, could be documented better)

        1 reply 1 retweet 1 like
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      6. End of conversation
      1. James Bennett‏ @ubernostrum 11 Sep 2019
        • Report Tweet

        And to clarify a bit: it’s 32,768 on my system. May be different on yours. The actual limit is your system’s SEM_VALUE_MAX.

        1 reply 0 retweets 2 likes
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      2. Chris Samp‏ @cgsamp 11 Sep 2019
        • Report Tweet
        Replying to @ubernostrum

        So THAT’S why my first programming teacher made me learn the first 16 powers of two by heart.

        1 reply 0 retweets 0 likes
      3. Diane Chen‏ @PurpleDiane88 11 Sep 2019
        • Report Tweet
        Replying to @cgsamp @ubernostrum

        When I was in High school (which was a looooong time ago), one of our teachers had us chanting "two to the tenth is ten twenty four" and insisted we would need to know that. He was right!

        1 reply 0 retweets 0 likes
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