I have a server which has been running slowly and sometime even crawling. Below is a s-trace of a command which i ran and i notices that a system call took about 24s to complete. Does anyone know what might be the reason? What can i troubleshoot in the server? All system metrics (CPU/RAM etc) looks normal to me.
0.000809 rt_sigaction(SIGKILL, {0x404840, [KILL], SA_RESTORER|SA_RESTART, 0x7fbb70b6c4b0}, 0x7fff1aa27e70, 8) = -1 EINVAL (Invalid argument)
0.024098 rt_sigaction(SIGTERM, {0x404840, [TERM], SA_RESTORER|SA_RESTART, 0x7fbb70b6c4b0}, {SIG_DFL, [], 0}, 8) = 0
0.006378 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 3325
24.746578 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3325, si_uid=0, si_status=0, si_utime=2134, si_stime=311} ---
0.011690 rt_sigaction(SIGINT, {SIG_DFL, [INT], SA_RESTORER|SA_RESTART, 0x7fbb70b6c4b0}, {0x404840, [INT], SA_RESTORER|SA_RESTART, 0x7fbb70b6c4b0}, 8) = 0
0.000986 rt_sigaction(SIGKILL, {SIG_DFL, [KILL], SA_RESTORER|SA_RESTART, 0x7fbb70b6c4b0}, 0x7fff1aa27e70, 8) = -1 EINVAL (Invalid argument)
Thanks in advance.
David