Re: CPU scaling
Alex Karasulu wrote:
Hi Howard,
I should be able to get a hold of an 8-way Xeon system in January
sometime. I will be able to place the order for it on the 2nd.
Sounds great, thanks Alex.
Interestingly, while 2 cores can get over 13,000 auths/second,
and 4
cores can
get around 25,000 auths/second (using back-hdb), with all 8 cores
it's only
peaking at 29,000 auths/second. This tells me it's better to run two
separate
slapds in a mirrormode configuration on this box (4 cores per
process) than to
run a single process across all of the cores. Then I'd expect to hit
50,000
auths/second total, pretty close to the limits of the ethernet
device/driver.
Well, I guessed wrong. The peak with two separate processes was still the
same, 29,000 auths/second. Interestingly, the peak with only 6 cores was about
31,000 auths/second. It appears that we're memory bandwidth-limited.
--
-- Howard Chu
Chief Architect, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/