>On 01/22/2013 10:50 PM, Gary Mills wrote: >> On Tue, Jan 22, 2013 at 11:54:53PM +0000, Edward Ned Harvey >> (opensolarisisdeadlongliveopensolari s) wrote: >> Paging out unused portions of an executing process from real memory to >> the swap device is certainly beneficial. Swapping out complete >> processes is a desperation move, but paging out most of an idle >> process is a good thing. > >It gets even better. Executables become part of the swap space via >mmap, so that if you have a lot of copies of the same process running in >memory, the executable bits don't waste any more space (well, unless you >use the sticky bit, although that might be deprecated, or if you copy >the binary elsewhere.) There's lots of awesome fun optimizations in >UNIX. :)
The "sticky bit" has never been used in that form of SunOS for as long as I remember (SunOS 3.x) and probably before that. It no longer makes sense in demand-paged executables. Casper _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
