Re: [PHP] How to reduce CPU usage in a cycle? [ag]

[Brent Baisley]

Personally, I wouldn't worry about it unless it is actually interfering 
with other processes. The OS will give any process or thread 100% of 
the CPU if there is nothing else that needs the CPU. What does you 
context switching numbers look like? If there is a lot of context 
switching, then your processes or threads are getting kicked off the 
CPU before they can accomplish much. And that's a problem.

The duration of your script is less  than a second, so that's not 
really a long enough time have an affect on other parts of the system. 
Heck, it may even being completing within just a couple of time slices 
(the length of time the OS allows a process/thread to use the CPU).

You could always adjust the priority level (nice value in Unix) of 
whatever PHP is running under (i.e. Apache). Although you should 
understand what you are doing if you are adjusting nice values.

On Dec 11, 2003, at 10:03 AM, TauAlex wrote:

Hello!

I'm having a problem with my php script on my linux web server. In that
script there is a cycle with some math calculations (about ~30 steps), 
the
execution time is less 1 second, but the script loads the server CPU 
up to
90%...
I've optimized script already to the minimum math function, anyway, it 
still
overloads the CPU.
How can I reduce the CPU load? It seems that usleep() does not help 
much,
especially in Windows (it's not supported).
How can I give system a portion of time in the end of each step (I 
don't
mind if it will increase the job time)? Is there a solution for both 
Windows
and Linux?

--
Brent Baisley
Systems Architect
Landover Associates, Inc.
Search & Advisory Services for Advanced Technology Environments
p: 212.759.6400/800.759.0577
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