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遇到一个很奇怪的问题。
昨天下载了mysql5.0.45(是二进制版本,解开就能用的那种),操作系统是RHEL5.1。
没做什么配置,解开tar包就运行mysql,发现产生了多个进程,我记得mysql一直是单进程(多线程)的啊,linux下不应该看到多个进程的。
相关信息如下:
[root@vtest bin]# uname -a
Linux vtest 2.6.18-53.el5 #1 SMP Wed Oct 10 16:34:02 EDT 2007 i686 athlon i386 GNU/Linux
[root@vtest bin]# ./mysqladmin -V
./mysqladmin Ver 8.41 Distrib 5.0.45, for pc-linux-gnu on i686
[root@vtest bin]# ./mysqld_safe --user=mysql &
[1] 6214
[root@vtest bin]# Starting mysqld daemon with databases from /usr/local/mysql/data
[root@vtest bin]#
[root@vtest ~]# ps ax
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6214 pts/0 S 0:00 /bin/sh ./mysqld_safe --user=mysql
6238 pts/0 S 0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql
6239 pts/0 S 0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql
6240 pts/0 S 0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql
6241 pts/0 S 0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql
6242 pts/0 S 0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql
6243 pts/0 S 0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql
6245 pts/0 S 0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql
6246 pts/0 S 0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql
6247 pts/0 S 0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql
6248 pts/0 S 0:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql
6249 pts/1 R+ 0:00 ps ax
[root@vtest ~]# top
top - 09:48:10 up 9:03, 2 users, load average: 0.00, 0.00, 0.00
Tasks: 55 total, 1 running, 54 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.3%us, 0.3%sy, 0.0%ni, 99.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 263564k total, 259360k used, 4204k free, 17776k buffers
Swap: 1048568k total, 96k used, 1048472k free, 200296k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6238 mysql 25 0 49272 12m 2020 S 0.0 5.0 0:00.30 mysqld
6239 mysql 18 0 49272 12m 2020 S 0.0 5.0 0:00.00 mysqld
6240 mysql 25 0 49272 12m 2020 S 0.0 5.0 0:00.00 mysqld
6241 mysql 24 0 49272 12m 2020 S 0.0 5.0 0:00.00 mysqld
6242 mysql 24 0 49272 12m 2020 S 0.0 5.0 0:00.00 mysqld
6243 mysql 25 0 49272 12m 2020 S 0.0 5.0 0:00.00 mysqld
6245 mysql 18 0 49272 12m 2020 S 0.0 5.0 0:00.01 mysqld
6246 mysql 18 0 49272 12m 2020 S 0.0 5.0 0:00.00 mysqld
6247 mysql 18 0 49272 12m 2020 S 0.0 5.0 0:00.00 mysqld
6248 mysql 25 0 49272 12m 2020 S 0.0 5.0 0:00.00 mysqld
5981 root 17 0 9152 2748 2216 S 0.0 1.0 0:02.95 sshd
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有人知道这是怎么回事吗? |
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