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Re: How to return unused memory to OS?

by CountZero (Bishop)
on Jan 11, 2008 at 05:57 UTC ( #661806=note: print w/ replies, xml ) Need Help??


in reply to How to return unused memory to OS?

Your analysis is basically correct. Once Perl has claimed the memory from the OS it will not be returned to the OS' pool.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James


Comment on Re: How to return unused memory to OS?
Re^2: How to return unused memory to OS?
by Limbic~Region (Chancellor) on Jan 11, 2008 at 19:56 UTC
      Most interesting and as usual I have to bow before your superior knowledge of these things.

      I will just add that I never saw the memory used by my Perl scripts get released back to the OS, but that may say more about my scripts than anything else. I have few long running scripts (except some mod_perl applications) so that may be the reason and I try to be parsimonious with memory so there is probably never enough in one block that can get released back to the OS.

      CountZero

      A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

      Perl uses a different allocation system on Windows than on other systems by default. You will experience differences in this are as a result.
      Hmmm...no matter what I do, windows does not reallocate that memory. I'm talking hundreds of megabytes of memory that are not reallocated. There seems to be nothing automatic about it....at least not in my case. Sounds like I need to use siding windows (as suggested by Rolf) or just deal with half of my memory being dedicated to a very simple task for days on end.

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