[20190523]修改参数后一些细节注意.txt
--//昨天远程给别人解决一个小问题,就是配置使用hugepage.一些细节必须注意,通过例子说明问题.
1.环境:
# cat /proc/version
Linux version 2.6.32-220.el6.x86_64 ([email?protected]) (gcc version 4.4.6 20110731 (Red Hat 4.4.6-3) (GCC) ) #1 SMP Tue Dec 6 19:48:22 GMT 20112.配置hugepages要修改/etc/security/limits.conf,加入如下注解部分:# grep memlock /etc/security/limits.conf#??????? - memlock - max locked-in-memory address space (KB)#*?? soft? memlock? 53248000#*?? hard? memlock? 53248000--//当前是没有打开.相当于修改配置文件.登录oracle用户:$ ps -ef | grep bas[h] | grep oracl[e]oracle?? 25704 25703? 5 10:38 pts/0??? 00:00:00 -bash--//bash进程号=25704$ cat /proc/25704/limitsLimit???????????????????? Soft Limit?????????? Hard Limit?????????? UnitsMax cpu time????????????? unlimited??????????? unlimited??????????? secondsMax file size???????????? unlimited??????????? unlimited??????????? bytesMax data size???????????? unlimited??????????? unlimited??????????? bytesMax stack size??????????? 10485760???????????? unlimited??????????? bytesMax core file size??????? 0??????????????????? unlimited??????????? bytesMax resident set????????? unlimited??????????? unlimited??????????? bytesMax processes???????????? 16384??????????????? 16384??????????????? processesMax open files??????????? 65536??????????????? 65536??????????????? filesMax locked memory???????? 65536??????????????? 65536??????????????? bytes~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Max address space???????? unlimited??????????? unlimited??????????? bytesMax file locks??????????? unlimited??????????? unlimited??????????? locksMax pending signals?????? 30408??????????????? 30408??????????????? signalsMax msgqueue size???????? 819200?????????????? 819200?????????????? bytesMax nice priority???????? 0??????????????????? 0Max realtime priority???? 0??????????????????? 0Max realtime timeout????? unlimited??????????? unlimited??????????? us--//如果你在别的窗口修改/etc/security/limits.conf:*?? soft? memlock? 53248000*?? hard? memlock? 53248000--//进程号=25704配置并不会改变,也就是要退出再登录才生效,这样情况下使用这个环境启动数据库肯定无法启动.--//在登录1个窗口:$ ps -ef | grep bas[h] | grep oracl[e]oracle?? 25704 25703? 0 10:38 pts/0??? 00:00:00 -bashoracle?? 25844 25842? 7 10:42 pts/1??? 00:00:00 -bash--//新增加1个窗口,进程号=25844?$ cat /proc/25844/limitsLimit???????????????????? Soft Limit?????????? Hard Limit?????????? UnitsMax cpu time????????????? unlimited??????????? unlimited??????????? secondsMax file size???????????? unlimited??????????? unlimited??????????? bytesMax data size???????????? unlimited??????????? unlimited??????????? bytesMax stack size??????????? 10485760???????????? unlimited??????????? bytesMax core file size??????? 0??????????????????? unlimited??????????? bytesMax resident set????????? unlimited??????????? unlimited??????????? bytesMax processes???????????? 16384??????????????? 16384??????????????? processesMax open files??????????? 65536??????????????? 65536??????????????? filesMax locked memory???????? 54525952000????????? 54525952000????????? bytes~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Max address space???????? unlimited??????????? unlimited??????????? bytesMax file locks??????????? unlimited??????????? unlimited??????????? locksMax pending signals?????? 30408??????????????? 30408??????????????? signalsMax msgqueue size???????? 819200?????????????? 819200?????????????? bytesMax nice priority???????? 0??????????????????? 0Max realtime priority???? 0??????????????????? 0Max realtime timeout????? unlimited??????????? unlimited??????????? us--//注意看下划线. 54525952000/1024 = 53248000 KB.--//也就是一些细节在工作中一定要注意.
