Messages in this thread | | | Subject | Re: 'disposable' dirty pages [was: Out Of Memory in v. 2.1] | Date | Thu, 08 Oct 1998 17:52:04 -0300 | From | "Brandon S. Allbery KF8NH" <> |
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In message <Pine.LNX.3.95.981008084640.1111A-100000@chaos.analogic.com>, "Richa rd B. Johnson" writes: +----- | On Thu, 8 Oct 1998, Cameron Simpson wrote: | > On 7 Oct 1998, in message <Pine.GSO.3.96.981007120041.28599A-100000@ultra5> | > Ely Wilson <plexus@ionet.net> wrote: | > | Hmm, I'm wondering. I haev this application, it allocates 10 blocks each | > | 1 megs in size. Then I free() 5 of those blocks, but the program is stil | > | eating 10 megs of memory. | > | Is this right? | > | > Well, it's "normal". UNIX processes generally only grow. | | glibc seems to give back memory. Here I allocate some memory, I don't +--->8
That's why glibc uses mmap() for large pages. All it has to do when they're freed is undo the mmap(), and the memory goes straight back to the OS.
-- brandon s. allbery [os/2][linux][solaris][japh] allbery@kf8nh.apk.net system administrator [WAY too many hats] allbery@ece.cmu.edu electrical and computer engineering KF8NH carnegie mellon university
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