![多个 Apache 根进程](https://linux22.com/image/1340549/%E5%A4%9A%E4%B8%AA%20Apache%20%E6%A0%B9%E8%BF%9B%E7%A8%8B.png)
我今天注意到,当我们从 Web 服务器发出请求时,速度相当慢。我开始调查,发现有大量 root 拥有的 Apache 进程。
我不确定这是否就是导致速度变慢的真正原因,但无论如何,情况看起来不太好。
问题是,我不知道接下来该做什么?我如何找出为什么有这么多根进程?有人能推荐一组测试吗?我尝试过跟踪其中几个,它们似乎在做一些事情,但 strace 的输出超出了我的能力范围。
root 30918 1.8 1.3 84284 52296 ? Ss 14:11 0:01 /usr/sbin/apache2 -k restart
root 30919 0.0 1.1 84420 45612 ? S 14:11 0:00 /usr/sbin/apache2 -k restart
root 30920 0.0 1.1 84420 45604 ? S 14:11 0:00 /usr/sbin/apache2 -k restart
root 30921 0.0 1.1 84420 45612 ? S 14:11 0:00 /usr/sbin/apache2 -k restart
root 30922 0.1 1.1 84420 45612 ? S 14:11 0:00 /usr/sbin/apache2 -k restart
root 30923 0.0 1.1 84420 45612 ? S 14:11 0:00 /usr/sbin/apache2 -k restart
www-data 30926 6.6 1.5 104964 61336 ? S 14:12 0:03 /usr/sbin/apache2 -k restart
root 30930 0.1 1.1 84420 45616 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
root 30933 0.0 1.1 84420 45616 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
root 30935 0.0 1.1 84420 45616 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
root 30936 0.0 1.1 84420 45616 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
root 30937 0.0 1.1 84420 45616 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
root 30938 0.0 1.1 84420 45616 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
root 30961 0.0 1.1 84420 45612 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
root 30989 0.0 1.1 84420 45612 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
root 30990 0.0 1.1 84420 45612 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
root 31011 0.1 1.1 84420 45612 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
root 31013 0.1 1.1 84420 45612 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
root 31014 0.0 1.1 84420 45612 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
www-data 31175 2.5 1.5 104168 60524 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
www-data 31189 2.3 1.4 102360 58920 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
www-data 31190 1.5 1.4 101904 58356 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
www-data 31191 0.3 1.1 84556 46760 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
www-data 31192 1.4 1.4 101916 58384 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
www-data 31193 1.5 1.4 101916 58376 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
root 31240 0.1 1.1 84420 45612 ? S 14:12 0:00 /usr/sbin/apache2 -k restart
这是其中一个进程的 strace 输出的示例。
--- SIGCHLD (Child exited) @ 0 (0) ---
read(6, 0xff87f6ef, 1) = -1 EAGAIN (Resource temporarily unavailable)
getuid32() = 0
close(17) = 0
gettimeofday({1354109303, 670988}, NULL) = 0
semop(5668864, {{0, -1, SEM_UNDO}}, 1) = 0
accept(4, {sa_family=AF_INET, sin_port=htons(48107), sin_addr=inet_addr("192.168.16.12")}, [16]) = 17
fcntl64(17, F_GETFD) = 0
fcntl64(17, F_SETFD, FD_CLOEXEC) = 0
semop(5668864, {{0, 1, SEM_UNDO}}, 1) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xf74a2768) = 1949
waitpid(1949, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0) = 1949
--- SIGCHLD (Child exited) @ 0 (0) ---
read(6, 0xff87f6ef, 1) = -1 EAGAIN (Resource temporarily unavailable)
getuid32() = 0
close(17) = 0
gettimeofday({1354109305, 724358}, NULL) = 0
semop(5668864, {{0, -1, SEM_UNDO}}, 1) = 0
accept(4, {sa_family=AF_INET, sin_port=htons(48132), sin_addr=inet_addr("192.168.16.12")}, [16]) = 17
fcntl64(17, F_GETFD) = 0
fcntl64(17, F_SETFD, FD_CLOEXEC) = 0
semop(5668864, {{0, 1, SEM_UNDO}}, 1) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xf74a2768) = 1974
waitpid(1974, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0) = 1974
--- SIGCHLD (Child exited) @ 0 (0) ---