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.