On what call(s) the process is blocking?

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I have a program that should be CPU bound, but it is using well less than 100% CPU, and is not consuming input as fast as it can. It means my process is blocking or sleeping somewhere.

How to find what calls are blocking my process for the most time? Is there a tool or debugging procedure that measures the time how much time the process is asleep on each blocking system call?

sleep blocking linux c debugging
1 Answers

strace is an option:

$ strace -wc sleep 1
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 99.96    1.000146     1000146         1           nanosleep
  0.01    0.000131         131         1           execve
  0.01    0.000082          10         8           mmap
[...]
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