From: William Lee Irwin III <wli@holomorphy.com>
To: Nir Livni <nirl@cyber-ark.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: shared objects, ELFs and memory usage
Date: Thu, 8 May 2003 03:01:28 -0700 [thread overview]
Message-ID: <20030508100128.GM8978@holomorphy.com> (raw)
In-Reply-To: <E1298E981AEAD311A98D0000E89F45134B55FB@ORCA>
On Thu, May 08, 2003 at 12:54:23PM +0300, Nir Livni wrote:
> After compiling and linking my .so with the -shared option,
> I've inspected strace output.
> I can clearly see that the shared object (which is 2MB size) is NOT being
> shared:
> 1395 open("/usr/local/sharedclient.so", O_RDONLY) = 6
> 1395 read(6, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\340\200"...,
> 1024) = 1024
> 1395 fstat64(6, {st_mode=S_IFREG|0644, st_size=2079700, ...}) = 0
> 1395 old_mmap(NULL, 2118824, PROT_READ|PROT_EXEC, MAP_PRIVATE, 6, 0) =
> 0x401ea000
> Any idea why ?
> (Please CC me because I am not subscribed)
It's called copy-on-write sharing. It is shared with the proviso that
all modified pages are privatized and not committed to disk.
-- wli
next prev parent reply other threads:[~2003-05-08 9:49 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-08 9:54 shared objects, ELFs and memory usage Nir Livni
2003-05-08 10:01 ` William Lee Irwin III [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-05-08 10:43 Nir Livni
2003-05-06 14:26 Nir Livni
2003-05-06 13:50 ` Richard B. Johnson
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