Re: homogeneous environments
"Robert W. Anderson" <[email protected]>
| Newsgroups | gmane.comp.compilers.distcc |
|---|---|
| Message-ID | <[email protected]> |
Fergus Henderson wrote: > > > On Thu, Apr 30, 2009 at 9:07 PM, Robert W. Anderson > <[email protected] <mailto:[email protected]>> wrote: > > Fergus Henderson wrote: > > The include server could be the bottleneck. What's the CPU > usage for the include server process? > Or it could be disk I/O. Try iostat or vmstat to profile that. > > > After some more experimentation, I think I may have a clue what's > going on here. I think I may be getting bound up in context > switching costs, both in my single node performance and on localhost > using distcc. > > On a single node: > > -j4: 24 million context switches @ 10us = 4m > -j8: 96 million context switches @ 10us = 16m > ... > > I don't understand why doubling the job count increases context > switching by 4x. Any insights appreciated. > > > You mentioned earlier that your host has four processors. No, I mentioned a few times that it has 16 processors. Thanks, -- Robert W. Anderson Center for Applied Scientific Computing Email: [email protected] Tel: 925-424-2858 Fax: 925-423-8704 __ distcc mailing list http://distcc.samba.org/ To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/distcc