On 10/26/2011 01:03 PM, Andrew Deason wrote:
On Wed, 26 Oct 2011 12:45:07 -0400
Jeffrey Altman<[email protected]> wrote:
I wonder why 128 threads (or 256 with 1.6) can't make use of more
than four cores though?
Resource contention between threads executing on separate sockets is
extremely expensive and there is no practical method of enforcing
processor affinity for all of the file server threads to ensure that
they only execute on cores within a single socket. At least not that
I am aware of on Linux. Windows would make such thread execution
restrictions trivial.
Linux, Solaris, and AIX all have this ability; I assume other Unix
platforms do, as well.
Is this what is being asked about?
http://linux.die.net/man/2/sched_setaffinity
On a (single socket) quad-core box with hyperthreading, is there an
advantage to restricting the fileserver to use fewer cores?
Thanks,
Jason
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