Why did httpd load spike on Red Hat Enterprise Linux 5.6?

Solution Unverified - Updated -

Issue

  • Why did httpd load spike on Red Hat Enterprise Linux 5.6?
  • Top out put :
top - 14:05:39 up 103 days,  4:26,  3 users,  load average: 3.05, 3.10, 3.08
Tasks: 122 total, 5 running, 117 sleeping, 0 stopped, 0 zombie
Cpu0 : 63.6%us, 0.1%sy, 0.0%ni, 36.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 : 63.9%us, 0.1%sy, 0.0%ni, 36.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 2058712k total, 2030248k used, 28464k free, 689712k buffers
Swap: 4096564k total, 8k used, 4096556k free, 1047908k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
32618 apache 25 0 131m 5008 2100 R 99.0 0.2 2140:48 httpd
32628 apache 25 0 131m 4980 2100 R 52.8 0.2 1967:29 httpd
32612 apache 25 0 131m 4648 1772 R 47.1 0.2 2180:29 httpd
  • Strace of htppd pid 13028

strac]#strace -p 13028
Process 13028 attached - interrupt to quit
select(0, NULL, NULL, NULL, {0, 683000}) = 0 (Timeout)
wait4(-1, 0x7fffb1eb0cbc, WNOHANG|WSTOPPED, NULL) = 0
select(0, NULL, NULL, NULL, {1, 0})     = 0 (Timeout)
wait4(-1, 0x7fffb1eb0cbc, WNOHANG|WSTOPPED, NULL) = 0
select(0, NULL, NULL, NULL, {1, 0})     = 0 (Timeout)
wait4(-1, 0x7fffb1eb0cbc, WNOHANG|WSTOPPED, NULL) = 0
select(0, NULL, NULL, NULL, {1, 0})     = 0 (Timeout)
wait4(-1, 0x7fffb1eb0cbc, WNOHANG|WSTOPPED, NULL) = 0
select(0, NULL, NULL, NULL, {1, 0})     = 0 (Timeout)
wait4(-1, 0x7fffb1eb0cbc, WNOHANG|WSTOPPED, NULL) = 0
select(0, NULL, NULL, NULL, {1, 0})     = 0 (Timeout)
wait4(-1, 0x7fffb1eb0cbc, WNOHANG|WSTOPPED, NULL) = 0
select(0, NULL, NULL, NULL, {1, 0})     = 0 (Timeout)
wait4(-1, 0x7fffb1eb0cbc, WNOHANG|WSTOPPED, NULL) = 0
select(0, NULL, NULL, NULL, {1, 0})     = 0 (Timeout)
wait4(-1, 0x7fffb1eb0cbc, WNOHANG|WSTOPPED, NULL) = 0
select(0, NULL, NULL, NULL, {1, 0})     = 0 (Timeout)
wait4(-1, 0x7fffb1eb0cbc, WNOHANG|WSTOPPED, NULL) = 0
select(0, NULL, NULL, NULL, {1, 0})     = 0 (Timeout)
wait4(-1, 0x7fffb1eb0cbc, WNOHANG|WSTOPPED, NULL) = 0
select(0, NULL, NULL, NULL, {1, 0})     = 0 (Timeout)
wait4(-1, 0x7fffb1eb0cbc, WNOHANG|WSTOPPED, NULL) = 0
select(0, NULL, NULL, NULL, {1, 0} <unfinished ...>
Process 13028 detached

Environment

  • Red Hat Enterprise Linux 5.6
  • Httpd : 2.2.3-53.el5_7.3.x86_64
  • APR (Apache Portable Runtime) rpm  is apr-1.2.7-11.el5_6.4

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