Hello,
Our system is sunfire v890 running solaris 10 08/07 release. The problem we
are experiencing is cpu hog process.
I find the pattern using 'truss -f -p pid' is as following:
lwp_sigmask(SIG_SETMASK, 0x00000000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF]
27082: pollsys(0xFFBFD560, 17, 0xFFBFF5C8, 0x00000000) = 1
27082: lwp_sigmask(SIG_SETMASK, 0xFFBFFAFF, 0x0000FFF7) = 0xFFBFFEFF
[0x0000FFFF]
27082: sigaction(SIGPIPE, 0xFFBFF388, 0xFFBFF428) = 0
27082: pollsys(0xFFBFD3F8, 1, 0xFFBFF460, 0x00000000) = 1
27082: sigaction(SIGPIPE, 0xFFBFF388, 0xFFBFF428) = 0
27082: recvfrom(386, "\r\n\r\n", 8, 2, 0xFFBFF4B4, 0xFFBFF4C4) = 4
27082: time() = 1245355435
27082: time() = 1245355435
27082: time() = 1245355435
On dev server, which doe NOT have the problem, the truss output is as following:
9050: lwp_sigmask(SIG_SETMASK, 0xFFBFFEFF, 0x0000FFF7) = 0xFFBFFEFF
[0x0000FFFF]
19050: lwp_sigmask(SIG_SETMASK, 0xFFBFFAFF, 0x0000FFF7) = 0xFFBFFEFF
[0x0000FFFF]
19050: pollsys(0xFFBFEC10, 7, 0xFFBFF048, 0x00000000) = 0
19050: lwp_sigmask(SIG_SETMASK, 0x00000000, 0x00000000) = 0xFFBFFEFF
[0x0000FFFF]
19050: pollsys(0xFFBFD308, 13, 0xFFBFF370, 0x00000000) = 1
19050: lwp_sigmask(SIG_SETMASK, 0xFFBFFAFF, 0x0000FFF7) = 0xFFBFFEFF
[0x0000FFFF]
19050: sigaction(SIGPIPE, 0xFFBFEF98, 0xFFBFF038) = 0
19050: write(115, " 0 0 7 5 1 - 1 2 0 ".., 79) = 79
19050: sigaction(SIGPIPE, 0xFFBFEF98, 0xFFBFF038) = 0
19050: time() = 1245355630
19050: time() = 1245355630
19050: time() = 1245355630
Looks like the difference is after sigaction, the problematic process is in
dead loop while the normal one is taking write action.
I tried dtrace to capture the difference as following:
#!/usr/sbin/dtrace -qs
proc:::signal-send
/args[2] == SIGPIPE/
{
printf ( "SIGPIPE was sent by %s pid = %d \n",
args[1]->pr_fname,args[1]->pr_pid);
}
This doesn't work as SIGPIPE is not a signal. Could anyone suggest the right
approach?
Thanks in advance,
zhu
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