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Groups > comp.lang.c > #21211

Re: Will 'free' return the memory Immediately to the OS ?

From Ben Pfaff <blp@cs.stanford.edu>
Newsgroups comp.lang.c
Subject Re: Will 'free' return the memory Immediately to the OS ?
Date 2012-05-22 13:45 -0700
Message-ID <874nr8djxa.fsf@blp.benpfaff.org> (permalink)
References (3 earlier) <i20ar71d8m427086mra7ortps5up3tqa7v@4ax.com> <jp4787$tmc$2@dont-email.me> <jp6j5t$q4m$1@dont-email.me> <jp6ott$t0q$1@dont-email.me> <jpgrn5$hbu$1@dont-email.me>

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Stephen Sprunk <stephen@sprunk.org> writes:

> There's that problem too, but I was thinking more along the lines of 4MB
> pages taking ~1000 times as long as 4kB pages to evict and reload.

I doubt that that is true, though.  I'd suspect that 4 MB pages
take less than 100 times as long as 4 kB pages to evict and
reload, maybe much less.

I tried to find some measurements online to support this point,
but couldn't quickly find anything relevant.

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Thread

Will 'free' return the memory Immediately to the OS ? Raj Pashwar <raj121190@hotmail.NOSPAM.com> - 2012-05-15 21:34 +0000
  Re: Will 'free' return the memory Immediately to the OS ? Ian Collins <ian-news@hotmail.com> - 2012-05-16 09:55 +1200
  Re: Will 'free' return the memory Immediately to the OS ? James Kuyper <jameskuyper@verizon.net> - 2012-05-15 18:42 -0400
  Re: Will 'free' return the memory Immediately to the OS ? Keith Thompson <kst-u@mib.org> - 2012-05-15 16:49 -0700
  Re: Will 'free' return the memory Immediately to the OS ? Ben Pfaff <blp@cs.stanford.edu> - 2012-05-15 16:59 -0700
  Re: Will 'free' return the memory Immediately to the OS ? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-05-15 20:24 -0400
  Re: Will 'free' return the memory Immediately to the OS ? David T. Ashley <dashley@gmail.com> - 2012-05-16 13:29 -0400
    Re: Will 'free' return the memory Immediately to the OS ? Stephen Sprunk <stephen@sprunk.org> - 2012-05-16 18:36 -0500
      Re: Will 'free' return the memory Immediately to the OS ? David T. Ashley <dashley@gmail.com> - 2012-05-17 09:47 -0400
        Re: Will 'free' return the memory Immediately to the OS ? Stephen Sprunk <stephen@sprunk.org> - 2012-05-17 11:22 -0500
        Re: Will 'free' return the memory Immediately to the OS ? Kaz Kylheku <kaz@kylheku.com> - 2012-05-17 16:54 +0000
          Re: Will 'free' return the memory Immediately to the OS ? Stephen Sprunk <stephen@sprunk.org> - 2012-05-18 12:30 -0500
        Re: Will 'free' return the memory Immediately to the OS ? Keith Thompson <kst-u@mib.org> - 2012-05-17 14:09 -0700
        Re: Will 'free' return the memory Immediately to the OS ? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-05-17 21:05 -0400
          Re: Will 'free' return the memory Immediately to the OS ? Stephen Sprunk <stephen@sprunk.org> - 2012-05-18 17:41 -0500
            Re: Will 'free' return the memory Immediately to the OS ? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-05-18 20:19 -0400
              Re: Will 'free' return the memory Immediately to the OS ? Stephen Sprunk <stephen@sprunk.org> - 2012-05-22 15:08 -0500
                Re: Will 'free' return the memory Immediately to the OS ? Ben Pfaff <blp@cs.stanford.edu> - 2012-05-22 13:45 -0700
                Re: Will 'free' return the memory Immediately to the OS ? Robert Wessel <robertwessel2@yahoo.com> - 2012-05-23 03:02 -0500
                Re: Will 'free' return the memory Immediately to the OS ? Robert Miles <milesrf@Usenet-News.net> - 2012-06-24 23:49 -0500
                Re: Will 'free' return the memory Immediately to the OS ? Stephen Sprunk <stephen@sprunk.org> - 2012-06-26 10:33 -0500
        Re: Will 'free' return the memory Immediately to the OS ? jgk@panix.com (Joe keane) - 2012-05-18 19:44 +0000
          Re: Will 'free' return the memory Immediately to the OS ? Stephen Sprunk <stephen@sprunk.org> - 2012-05-18 17:27 -0500
            Re: Will 'free' return the memory Immediately to the OS ? jgk@panix.com (Joe keane) - 2012-05-22 21:52 +0000
              Re: Will 'free' return the memory Immediately to the OS ? Ian Collins <ian-news@hotmail.com> - 2012-05-23 11:12 +1200
                Re: Will 'free' return the memory Immediately to the OS ? Robert Wessel <robertwessel2@yahoo.com> - 2012-05-23 03:15 -0500
    Re: Will 'free' return the memory Immediately to the OS ? Robert Wessel <robertwessel2@yahoo.com> - 2012-05-17 11:54 -0500

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