Re: How to limit CPU usage within C++ (Linux)

peter koch <>
Tue, 19 Aug 2008 01:50:52 -0700 (PDT)
On 19 Aug., 10:44, Alexander Dong Back Kim <>

Dear members,

First of all, I apologize that this question is not 100% pure C++
question so some might be annoyed by this.

I'm writing a multithreading based application. The application can
use flexible number of threads while it's running (between 2~32
threads when it's needed or configured). My development machine has 8
CPU so the application I'm writing sometimes uses 600% of CPU usage
which was very impressive at the beginning. However, since the real
target machine has only 1 CPU and requires to run many other
applications at the same time, I think I should somehow limit the CPU
usage of my application (let say 30%.

I tried to use sleep() but I found out it's not good enough because I
want to explicitly define maximum CPU usage rate for this application.
Any suggestion or recommendation are welcomed and appreciated.


There is no good C++ answer to your question - using sleep is
certainly not a good solution.
The way to go is to have "nice" threads - giving them a lower priority
than the normal user threads. This way you can get all the CPU-time
when noone else is using the CPU(s) without impeding them they want to
run something "more important".


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