Re: VC++ 2013, malloc() and free()

From	Melzzzzz <mel@zzzzz.com>
Newsgroups	comp.lang.c
Subject	Re: VC++ 2013, malloc() and free()
Date	2016-10-25 16:55 +0200
Organization	albasani.net
Message-ID	<20161025165527.6ef70fd4@maxa-pc.cpe.bvcom.net> (permalink)
References	(2 earlier) <numo37$2l9$3@dont-email.me> <20161025071544.6dd3b8d6@maxa-pc.cpe.bvcom.net> <b1ed8ae0-cbfb-4e75-8db0-00a222660138@googlegroups.com> <20161025161851.6d657301@maxa-pc.cpe.bvcom.net> <7815aa7e-f328-4994-ba9e-5b03949fc91a@googlegroups.com>

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On Tue, 25 Oct 2016 07:32:50 -0700 (PDT)
supercat@casperkitty.com wrote:

> On Tuesday, October 25, 2016 at 9:19:00 AM UTC-5, Melzzzzz wrote:
> > > Uh, no it doesn't.  Any decent malloc() implementation on a
> > > Windows machine will request memory from the OS in large chunks
> > > and then dole it out to the application in smaller chunks.
> > > Calling free() will add storage into a list of space that has
> > > been received from the operating system and is available for
> > > future calls to malloc().  When a program finishes, the operating
> > > system won't care about what the program has done with its
> > > blocks, or what portions it had marked as available for its own
> > > reuse.  The OS will simply mark all of the "big" blocks it had
> > > given to the allocation as available for reuse. Although calling
> > > free() on every allocated block before exiting may make it easier
> > > to diagnose memory leaks [if a program is expected to have done
> > > so, but some blocks remain allocated, that will indicate that
> > > something that was expected to have been freed, wasn't] and while
> > > it's useful to allow programs to be incorporated into other
> > > programs, for the scenario of a program being run from a typical
> > > OS best efficiency would be obtained by not having applications
> > > bothering with free() unless they themselves are going to have
> > > use for the memory released thereby.  
> > 
> > I talked about garbage collector.  
> 
> The set of blocks the OS cleanup logic will need to handle will
> generally be the same regardless of whether the application calls
> free() or not.

No, I meant cleanup runs of GC. Is that wasting of CPU cycles?

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Thread

VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-24 02:20 +0800
  VC++ 2013, malloc() and free() asetofsymbols@gmail.com - 2016-10-23 11:44 -0700
    Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 12:46 +0800
      Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 07:15 +0200
        Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-25 07:15 -0700
          Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 16:18 +0200
            Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-25 07:32 -0700
              Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 16:55 +0200
              Re: VC++ 2013, malloc() and free() jameskuyper@verizon.net - 2016-10-25 08:07 -0700
      Re: VC++ 2013, malloc() and free() "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-10-24 22:30 -0700
        Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 07:46 +0200
          Re: VC++ 2013, malloc() and free() "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-10-25 17:54 -0700
            Re: VC++ 2013, malloc() and free() "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-10-25 17:55 -0700
        Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 22:32 +0800
          Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 16:46 +0200
            Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 23:24 +0800
              Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 23:52 +0800
          Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-25 08:01 -0700
            Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 17:23 +0200
              Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-25 09:09 -0700
                Re: VC++ 2013, malloc() and free() Keith Thompson <kst-u@mib.org> - 2016-10-25 09:29 -0700
                Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 18:51 +0200
                Re: VC++ 2013, malloc() and free() raltbos@xs4all.nl (Richard Bos) - 2016-10-27 19:54 +0000
                Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-27 15:06 -0700
                Re: VC++ 2013, malloc() and free() Keith Thompson <kst-u@mib.org> - 2016-10-27 17:06 -0700
                Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-28 06:47 -0700
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-29 23:16 +0800
                Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-29 09:35 -0700
                Re: VC++ 2013, malloc() and free() "James R. Kuyper" <jameskuyper@verizon.net> - 2016-10-29 12:51 -0400
                Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-29 14:26 -0700
                Re: VC++ 2013, malloc() and free() jameskuyper@verizon.net - 2016-10-29 15:27 -0700
                Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-29 17:11 -0700
          Re: VC++ 2013, malloc() and free() Geoff <geoff@invalid.invalid> - 2016-10-31 13:01 -0700
            Re: VC++ 2013, malloc() and free() Jerry Stuckle <jstucklex@attglobal.net> - 2016-10-31 16:35 -0400
              Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-01 15:31 +0800
                Re: VC++ 2013, malloc() and free() Jerry Stuckle <jstucklex@attglobal.net> - 2016-11-01 11:28 -0400
      Re: VC++ 2013, malloc() and free() Geoff <geoff@invalid.invalid> - 2016-10-31 12:11 -0700
        Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-31 13:08 -0700
  Re: VC++ 2013, malloc() and free() Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-10-23 21:35 +0100
    Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 12:49 +0800
      Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 07:16 +0200
        Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 22:30 +0800
  Re: VC++ 2013, malloc() and free() "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-10-23 15:52 -0700
    Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 12:50 +0800
      Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 07:18 +0200
        Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 22:28 +0800
          Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 16:48 +0200
            Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 23:25 +0800
              Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 17:35 +0200
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 23:50 +0800
                Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 18:45 +0200
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-26 01:59 +0800
                Re: VC++ 2013, malloc() and free() Geoff <geoff@invalid.invalid> - 2016-10-31 12:10 -0700
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-01 15:32 +0800
                Re: VC++ 2013, malloc() and free() Jerry Stuckle <jstucklex@attglobal.net> - 2016-11-01 11:31 -0400
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-03 19:28 +0800
                Re: VC++ 2013, malloc() and free() Jerry Stuckle <jstucklex@attglobal.net> - 2016-11-03 10:00 -0400
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-03 23:25 +0800
                Re: VC++ 2013, malloc() and free() Keith Thompson <kst-u@mib.org> - 2016-11-03 09:03 -0700
                [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-04 02:33 +0800
                Re: [OT] Keith Thompson <kst-u@mib.org> - 2016-11-03 12:26 -0700
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-04 12:05 +0800
                Re: [OT] luser droog <luser.droog@gmail.com> - 2016-11-03 21:52 -0700
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-04 21:59 +0800
                Re: [OT] Keith Thompson <kst-u@mib.org> - 2016-11-04 08:45 -0700
                Re: [OT] James Kuyper <jameskuyper@verizon.net> - 2016-11-04 11:49 -0400
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-05 00:33 +0800
                Re: [OT] Keith Thompson <kst-u@mib.org> - 2016-11-04 09:56 -0700
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-05 01:40 +0800
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-05 01:42 +0800
                Re: [OT] Keith Thompson <kst-u@mib.org> - 2016-11-04 11:52 -0700
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-05 18:13 +0800
                Re: [OT] Keith Thompson <kst-u@mib.org> - 2016-11-05 13:19 -0700
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-06 16:00 +0800
                Re: VC++ 2013, malloc() and free() Jerry Stuckle <jstucklex@attglobal.net> - 2016-11-03 20:16 -0400
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-05 00:34 +0800
                Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-11-03 08:54 -0700
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-04 02:31 +0800

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