Linux has a guadzillion debugging utilities available. One of my
favorite tools for debugging problems is strace, which allows you to
observe the system calls a process is making in realtime. Strace also
has a “-c” option to summarize system call activity:
$ strace -c -p 28009
The output contains the percentage of time spent in each system call, the total time in seconds, the microseconds per call, the total number of calls, a count of the number of errors and the type of system call that was made.
This output has numerous uses, and is a great way to observe how a process is interacting with the kernel. Good stuff!
$ strace -c -p 28009
Process 28009 attached Process 28009 detached % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 78.17 0.001278 2 643 select 14.80 0.000242 1 322 read 7.03 0.000115 0 322 write ------ ----------- ----------- --------- --------- ---------------- 100.00 0.001635 1287 total
The output contains the percentage of time spent in each system call, the total time in seconds, the microseconds per call, the total number of calls, a count of the number of errors and the type of system call that was made.
This output has numerous uses, and is a great way to observe how a process is interacting with the kernel. Good stuff!
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