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Linux释放内存及手动释放Oracle共享内存段

原创 Linux操作系统 作者:wailon 时间:2013-11-09 17:22:27 0 删除 编辑

$ free -m
free内存减少到几十兆,系统运行缓慢
 
运行sync将dirty的内容写回硬盘
$sync
 
drop_caches的详细文档如下:
Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.
To free pagecache:
* echo 1 > /proc/sys/vm/drop_caches
To free dentries and inodes:
* echo 2 > /proc/sys/vm/drop_caches
To free pagecache, dentries and inodes:
* echo 3 > /proc/sys/vm/drop_caches
As this is a non-destructive operation, and dirty objects are notfreeable, the user should run "sync" first in order to make sure allcached objects are freed.
This tunable was added in 2.6.16.
 
修改/etc/sysctl.conf 添加如下选项后就不会内存持续增加
vm.dirty_ratio = 1
vm.dirty_background_ratio=1
vm.dirty_writeback_centisecs=2
vm.dirty_expire_centisecs=3
vm.drop_caches=3
vm.swappiness =100
vm.vfs_cache_pressure=163
vm.overcommit_memory=2
vm.lowmem_reserve_ratio=32 32 8
kern.maxvnodes=3

 
手动删除Oracle共享内存段
$ ps -ef |grep $ORACLE_SID|grep -v grep|awk '{print $2}' | xargs kill -9
$ ipcs -m | grep oracle | awk '{print $2}' | xargs ipcrm shm

--增加LINUX虚拟内存,11g由于设置memory_target参数而共享内存过小,无法启动时报ORA-00845
mount -t tmpfs shmfs -o size=32g /dev/shm

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