pmap memory leak  10818 Closed denizyuret opened this Issue on Apr 14, 2015 · 2 comments Projects None yet Labels parallel Milestone No milestone Assignees No one assigned 4 participants  denizyuret  timholy  amitmurthy  ViralBShah Notifications    denizyuret denizyuret commented on Apr 14, 2015  The code below leaks in Version 0.3.7  2015-03-23 21:36 UTC  and Version 0.4.0-dev+3718  2015-03-07 21:17 UTC . gc   does not seem to help. Replacing pmap with map stops the leak.  function main       for epoch 1:100          show epoch         a   helper            everywhere gc            everywhere println Base.PGRP.refs      end end  function helper        time p   pmap workers    do w         x   rand Float32, 1  10, 1  15      end     return 0 end  main     ViralBShah ViralBShah added the parallel label on Apr 14, 2015  timholy The Julia Language member timholy commented on Apr 14, 2015   3934,  8912,  6597  amitmurthy The Julia Language member amitmurthy commented on Apr 22, 2015  Thanks to  vtjnash 's fix 3bbc5fc  memory usage reaches a steady high state quite soon and does not keep growing when tested with the following code  julia -p 2 :  function main       for epoch 1:100          show epoch         a   helper            everywhere gc       end end  function helper        time p   pmap workers    do w         x   ones 10 8      end     return 0 end  main    The resident memory  after 100 loops  for the master is around 4.5G and for the workers around 800 MB each. That is probably a different issue.  Closing this issue.  amitmurthy amitmurthy closed this on Apr 22, 2015  timholy timholy referenced this issue on Apr 23, 2015 Closed Memory issue in pmap?  3934