10782 www 20 0 360m 26m 15m R 75.5 0.3 0:10.93 php-cgi
10708 www 25 0 360m 22m 12m R 69.7 0.3 0:45.16 php-cgi
10683 www 25 0 362m 28m 15m R 54.2 0.4 0:32.65 php-cgi
10711 www 25 0 360m 25m 15m R 52.2 0.3 0:44.25 php-cgi
10688 www 25 0 359m 25m 15m R 38.7 0.3 0:10.44 php-cgi
10719 www 25 0 360m 26m 16m R 7.7 0.3 0:40.59 php-cgi
找其中一个 CPU 100% 的 php-cgi 进程的 PID，用以下命令跟踪一下：
strace -p 10747
select(7, [6], [6], [], {15, 0}) = 1 (out [6], left {15, 0})
poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
select(7, [6], [6], [], {15, 0}) = 1 (out [6], left {15, 0})
poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
select(7, [6], [6], [], {15, 0}) = 1 (out [6], left {15, 0})
poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
select(7, [6], [6], [], {15, 0}) = 1 (out [6], left {15, 0})
poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
select(7, [6], [6], [], {15, 0}) = 1 (out [6], left {15, 0})
poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
select(7, [6], [6], [], {15, 0}) = 1 (out [6], left {15, 0})
poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
select(7, [6], [6], [], {15, 0}) = 1 (out [6], left {15, 0})
poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
select(7, [6], [6], [], {15, 0}) = 1 (out [6], left {15, 0})
poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
select(7, [6], [6], [], {15, 0}) = 1 (out [6], left {15, 0})
poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
select(7, [6], [6], [], {15, 0}) = 1 (out [6], left {15, 0})
poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
那么，就可以确定是 file_get_contents() 导致的问题了。
