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Linux人工清理內存cache

hat and opera memory des struct ron span ati

  內存緩存的出現是解決,設備之間的讀寫速度的差異!

00、linux緩存解釋

/proc/sys/vm/drop_caches (since Linux 2.6.16)
Writing to this file causes the kernel to drop clean caches,dentries and inodes from memory, causing that memory to become free

sync //fist act!!!
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.

Linux人工清理內存cache