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linux下释放系统内存

2010-09-27 14:27:55| 分类： Linux | 标签： |举报 |字号大中小订阅

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1.释放共享内存：
ipcs -m | awk '{if($2~/^[0-9]+$/)print $2}'
cat out | while read shid
do
ipcrm shm $shid
done

2.释放内存：
sync
sync
sync
free -m
echo 1 >/proc/sys/vm/drop_caches
free-m
echo 0 >/proc/sys/vm/drop_caches

关于drop_caches的官方说明如下：

Writing to this file causes the kernel to drop clean caches,dentries and inodes from memory, causing that memory to becomefree.

To free pagecache, use echo 1 > /proc/sys/vm/drop_caches;

to free dentries and inodes, use echo 2 > /proc/sys/vm/drop_caches;

to free pagecache, dentries and inodes, use echo 3 >/proc/sys/vm/drop_caches.

Because this is a non-destructive operation and dirty objects are not freeable, the user should run sync first.

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