http://www-01.ibm.com/support/knowledgecenter/SSEPGG_9.7.0/com.ibm.db2.luw.qb.server.doc/doc/t0008238.html?cp=SSEPGG_9.7.0%2F2-0-2-1-2-2-5-3&lang=zh
ipcs -l #该命令可以看到内核参数的值(共享内存段,信号量,消息队列)
vm.swappiness是内核参数:
使得vm.swappindess生效:
cat /proc/sys/vm/swappiness
cp /etc/sysctl.conf /tmp
echo 'vm.swappiness=0' >> /etc/sysctl.conf
sysctl -p
cat /proc/sys/vm/swappiness
修改单个用户的最大openfile数量&&用户的最大进程数量(这不算内核参数,算是资源限制参数):
echo '* soft nofile 51200' >> /etc/security/limits.conf
echo '* hard nofile 51200' >> /etc/security/limits.conf
echo ‘* soft noproc 11000' >> /etc/security/limits.conf
echo ‘* hard noproc 11000' >> /etc/security/limits.conf
echo '* soft nofile 51200' >> /etc/security/limits.d/90-nproc.conf
echo '* hard nofile 51200' >> /etc/security/limits.d/90-nproc.conf
echo '* soft noproc 11000' >> /etc/security/limits.d/90-nproc.conf
echo '* hard noproc 11000' >> /etc/security/limits.d/90-nproc.conf
需要用户重新登录才能生效;
ulimit -a 可以查看user的资源限制参数。一个普通用户能够在一个单独session中使用的最大资源。root用户没有此限制。