UNIX for Dummies Questions & Answers

On the other hand, if you want to limit CPU usage by a percentage and are using a recent enough Solaris release, you can use per project or per zone CPU capping.

CPU caps (Project rm.cpu-caps) - XWiki

No idea about Linux or netBSD.

Hi friends,
Thanks for your replies. By the way mine is a single processor environment and i need this program to do some stress testing. My task should consume CPU as per the specification ie the amount the task should utilize is given as a parameter eg:utilizeCpu(90) should utilize 90% of the CPU. I dont know whether this is feasible. I am a newbie to linux please let me know if there is any way to sort out this problem ????

Thanks,
Chandru.

Why do you need that ?
Is this homework ?
Why don't you answer the questions asked in post #4 ?
In any case, you cannot guarantee a process will use 90% of a CPU or 90% of all CPUs. That depends on CPU availability/ what other processes and the kernel are doing.

Hi,
The function should take the CPU utilization to the desired percentage and stay there. It should be based on the amount of CPU being used by the processes currently running. now if i give 90% cumulatively all the process taken together along with my process should take 90% of the CPU. Need not prempt any processes running at that time. I could not understand some concepts in post #4 what you mean by "Instantaneously a process is running either 100% or 0%" could you be more clear on that? Thanks for your reply.

Why do you need that ? (You only describe what you need, not why)
Is this homework ? (You failed to answer that one)
What concepts in the questions asked in post #4 are you failing to understand ?
You cannot reliably limit the CPU used to 90% without preempting running processes.
By 100% or 0%, I mean CPU load is computed by sampling. At a given time, a CPU is either idle (0%) or not (100%). Intermediary values are only the result of averaging these values.