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POHow to use pthread_setaffinity_np
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copied!<p>I am working on a performance critical system that has a lot of logging. I am planning to do my major computation in a thread that sticks to one core, and logs in another thread that sticks to another core. How do I achieve that in pthread_setaffinity_np() ?</p> <p>I imagine that my code would look like </p> <pre><code>void log_something(const string& st) { pthread_setaffinity_np(pthread_self(),sizeof(cpuset),&cpuset); //LOG string st; } int main() { while (true) { // do some computation log_something(something) } } </code></pre> <p>My question is, when I call pthread_setaffinity_np() in log_something(), would it do the logging in the cpu I specified, and while doing the logging, return to the while loop of main() and continue the computation? </p> <p>Or it will switch the entire program to that cpu set, and will only return to main method after logging? </p> <p>Thanks! </p> <p>[EDITED] I use logging as an example but my practical problem is more complicated than that. For example, I might have to update a dynamic parameter every minute, and while I am updating the parameter, I still want to continue my computation in the main() method based on the old parameter (i.e. I just can't stop my main computation for parameter updating). Therefore the process of updating the parameters might have to be migrated to another thread that sticks to another core. So I am looking for a generic solution of separating the computation, not just an efficient logger. </p> <p>Sorry for the confusion. </p>

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