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MorlockP's profile
ⓘ Dogs don't have thumbs
ⓘ Dogs don't have thumbs
ⓘ Dogs don't have thumbs
@MorlockP

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ⓘ Dogs don't have thumbs

@MorlockP

Two-time Prometheus award-winning hard science fiction author. https://www.amazon.com/dp/B005JPPMS6  Learn how to homestead https://www.amazon.com/dp/B093BC3K1T 

Aristillus Crater, Luna
amazon.com/dp/B005JPPMS6
Joined June 2012

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    1. ⓘ Dogs don't have thumbs‏ @MorlockP 5 Dec 2018

      AHA! Figured out this LMDB issue. (a) the built in locking didn't work across threads (b) my own pthread_mutex locking failed, but the DB was still corrupted. read the header file section about locking...no help. Then read the section on "read only" mode... and learn...

      2 replies 0 retweets 5 likes
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    2. Howard Chu‏ @hyc_symas 7 Dec 2018
      Replying to @MorlockP

      Eh, what? Of course the built in locking works across threads, that's what pthread_mutexes are designed for. There are no concurrency bugs in LMDB.

      1 reply 0 retweets 0 likes
    3. ⓘ Dogs don't have thumbs‏ @MorlockP 7 Dec 2018
      Replying to @hyc_symas

      All I can tell you is that when invited off 20 writes in 20 threads and used built in locking, 30% of writes got corrupted, and when I turned locking off and used my own thread murders, 0% did. /shrug

      1 reply 0 retweets 1 like
    4. Howard Chu‏ @hyc_symas 7 Dec 2018
      Replying to @MorlockP

      What platform? You realize that LMDB fully serializes writes? There is in fact no write concurrency.

      2 replies 0 retweets 1 like
    5. Howard Chu‏ @hyc_symas 7 Dec 2018
      Replying to @hyc_symas @MorlockP

      The only way you could make that fail is by using a single txn from multiple threads. Which the docs clearly prohibit.

      1 reply 0 retweets 0 likes
      ⓘ Dogs don't have thumbs‏ @MorlockP 7 Dec 2018
      Replying to @hyc_symas

      Yes, understood. I generate a new transaction inside each thread. I tried it with all transactions rooted in one parent trans that lives in the primary thread, and I tried it w root trans and child trans in each writer thread. Failed both ways (differently). Former segvs.

      4:44 AM - 7 Dec 2018
      1 reply 0 retweets 0 likes
        1. Howard Chu‏ @hyc_symas 7 Dec 2018
          Replying to @MorlockP

          Child txns are required to run in the same thread as the parent txn. This would explain your problem.

          0 replies 0 retweets 0 likes
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