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o_guest's profile
Olivia Guest | Ολίβια Γκεστ
Olivia Guest | Ολίβια Γκεστ
Olivia Guest | Ολίβια Γκεστ
@o_guest

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Olivia Guest | Ολίβια Γκεστ

@o_guest

• goth gremlin • computational cognitive/neuroscience modeling • geek & techish Cypriot • plant aficionada • came up with #bropenscience • http://neuroplausible.com  •

Τότεναμ, Λονδίνο & Cyprus
olivia.science
Joined October 2015

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    Olivia Guest | Ολίβια Γκεστ‏ @o_guest 5 Apr 2017
    • Report Tweet

    What do I need to understand about Python multiprocessing to have faster instead of slower code? Obviously doing something super wrong. 😣

    10:02 AM - 5 Apr 2017
    • 2 Likes
    • Joe Simons David Bauer
    3 replies 0 retweets 2 likes
      1. New conversation
      2. Manuel Martín‏ @draxus 6 Apr 2017
        • Report Tweet
        Replying to @o_guest

        it actually can work slower if you use too many cores. Try with 2 or 4 to see if it's speeding up.

        1 reply 0 retweets 1 like
      3. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 6 Apr 2017
        • Report Tweet
        Replying to @draxus

        I have 32 on my machine tho..?

        1 reply 0 retweets 0 likes
      4. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 6 Apr 2017
        • Report Tweet
        Replying to @o_guest @draxus

        I tried with 2 and 4 also just to be clear.

        1 reply 0 retweets 0 likes
      5. Manuel Martín‏ @draxus 6 Apr 2017
        • Report Tweet
        Replying to @o_guest

        I've just seen your code. Not sure if it might be due to apply_async? I usually do this: https://pastebin.com/uJVvpYqv 

        1 reply 0 retweets 1 like
      6. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 6 Apr 2017
        • Report Tweet
        Replying to @draxus

        I'll try your way. But like @seaandsailor was saying it could be that I'm not doing enough on each worker? Turbo thanks for code I'll try. 😅

        1 reply 0 retweets 1 like
      7. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 6 Apr 2017
        • Report Tweet
        Replying to @o_guest @draxus @seaandsailor

        OK, so I don't actually understand your way, sorry. You have to bear in mind I used multiprocessing for the first time yesterday. ☺️

        1 reply 0 retweets 0 likes
      8. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 6 Apr 2017
        • Report Tweet
        Replying to @o_guest @draxus @seaandsailor

        for example where you define your arguments why are you using itertools.product?

        1 reply 0 retweets 0 likes
      9. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 6 Apr 2017
        • Report Tweet
        Replying to @o_guest @draxus @seaandsailor

        does that mean I have to use itertools.combinations? my loop is outside all this... hmm...

        2 replies 0 retweets 0 likes
      10. 2 more replies
      1. New conversation
      2. ⓪ Rik Smith-Unna  🇰🇪‏ @blahah404 6 Apr 2017
        • Report Tweet
        Replying to @o_guest

        shared memory, scheduling and inter-thread communication (applies to all languages)

        1 reply 0 retweets 0 likes
      3. ⓪ Rik Smith-Unna  🇰🇪‏ @blahah404 6 Apr 2017
        • Report Tweet
        Replying to @blahah404 @o_guest

        may need to modify data structures or algorithms to mitigate

        1 reply 0 retweets 0 likes
      4. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 6 Apr 2017
        • Report Tweet
        Replying to @blahah404

        I know but like I have it working and it's memory safe unlike scipy/sklearn versions BUT NO IDEA how to get to the data.

        1 reply 0 retweets 0 likes
      5. ⓪ Rik Smith-Unna  🇰🇪‏ @blahah404 6 Apr 2017
        • Report Tweet
        Replying to @o_guest

        get the data from where?

        1 reply 0 retweets 0 likes
      6. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 6 Apr 2017
        • Report Tweet
        Replying to @blahah404

        OK, hang on — many have tried to help and I got this far mostly without ever using this library.

        2 replies 0 retweets 1 like
      7. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 6 Apr 2017
        • Report Tweet
        Replying to @o_guest @blahah404

        Actually I might not be able to share right now because of how busy I am. I am trying to parallelise something & failing abysmally here are

        1 reply 0 retweets 0 likes
      8. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 6 Apr 2017
        • Report Tweet
        Replying to @o_guest @blahah404

        some of my attempts — currenytly trying something new as I'm 100% stuck there:https://github.com/oliviaguest/pairwise_distance/blob/master/pairwise_distance.py …

        1 reply 0 retweets 0 likes
      9. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 6 Apr 2017
        • Report Tweet
        Replying to @o_guest @blahah404

        my new tactic is also failing so if you can see the light for any of these attempts that wd be awesome — going to keep trying a little more

        1 reply 0 retweets 0 likes
      10. 2 more replies
      1. New conversation
      2. David Ellis‏ @Ducksual 5 Apr 2017
        • Report Tweet
        Replying to @o_guest

        How much work are you doing in each process and how much information are you passing between processes?

        1 reply 0 retweets 0 likes
      3. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 5 Apr 2017
        • Report Tweet
        Replying to @Ducksual

        I am trying to do a simple distance metric for each two points in a huge array and I think I am passing nothing.

        1 reply 0 retweets 0 likes
      4. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 5 Apr 2017
        • Report Tweet
        Replying to @o_guest @Ducksual

        Shall I share my code? Would that help?

        2 replies 0 retweets 0 likes
      5. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 5 Apr 2017
        • Report Tweet
        Replying to @o_guest @Ducksual

        If it it would, here it is! I am a total noob with this in Python so I'm probably doing something terribly wrong!https://github.com/oliviaguest/pairwise_distance/blob/master/pairwise_distance.py …

        0 replies 0 retweets 0 likes
      6. End of conversation

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