c++ - how to calculate the accurate time cost for one function?

Question

I want to test latency between two kind of ipc method.

one is zeromq ipc mode, the other is shared memory mode.

and my result tells me, shm cost 0.7 us for each data passing from one process to another, zeromq cost 13us.

I think the number is too large, i suspect it's caused by my timer function, i use gettimeofday method of c++.

Is there any good method to test a functions time cost, and, for a shared memory opertion, is 0.7 us too long? what is the normal range?

thanks

Answer 1

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