Messages in this thread | | | Date | Thu, 8 May 2003 03:01:28 -0700 | From | William Lee Irwin III <> | Subject | Re: shared objects, ELFs and memory usage |
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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.
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