Originally posted by: ToshiyukiMiyamoto

Hi,

When I run multiple CPOs in parallel, the search speed of CPO slows down.

Why does it slow down? And, is it possible to avoid the slow down?

In detail:

* My PC has Intel Core i7, thus it has 4 cores. And it has enough memory. Its OS is Linux.

* The oplrun command is used.

* I changed the number of runs from 1 to 3. Thus, I have enough cores.

* The number of workers of each run is limited to 1.

* I measured the search speed from the line of "Search speed" in log files.

* Results are as follows:

 % grep speed one_thread.log
 ! Search speed (br. / s) : 12.3
% grep speed two_threads.log
 ! Search speed (br. / s) : 10.4
 ! Search speed (br. / s) : 10.4
% grep speed three_threads.log
 ! Search speed (br. / s) : 8.3
 ! Search speed (br. / s) : 8.3
 ! Search speed (br. / s) : 8.3

* Thus, the search speed slowed down by about 33% when we run  three CPOs in parallel. (12.3 -> 8.3)

Originally posted by: ChrisBr

Hello Toshiyuki,

The slow down is normal because some machine's resources are shared.
If you really think that there is a problem, send us your model, so that we'll be able to check if there is anything abnormal.

Regards,

Chris.

Originally posted by: ToshiyukiMiyamoto

Thanks.