Difference between revisions of "Clear Memory Linux"
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(New page: ==== Clear Memory Linux ==== 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: <pre>* ec...) |
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| − | ==== Clear Memory Linux ==== | + | ==== Clear Memory Linux ==== |
| − | Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free. | + | 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: | + | To free pagecache: |
<pre>* echo 1 > /proc/sys/vm/drop_caches</pre> | <pre>* echo 1 > /proc/sys/vm/drop_caches</pre> | ||
| − | To free dentries and inodes: | + | To free dentries and inodes: |
<pre>* echo 2 > /proc/sys/vm/drop_caches</pre> | <pre>* echo 2 > /proc/sys/vm/drop_caches</pre> | ||
| − | To free pagecache, dentries and inodes: | + | To free pagecache, dentries and inodes: |
<pre>* echo 3 > /proc/sys/vm/drop_caches</pre> | <pre>* echo 3 > /proc/sys/vm/drop_caches</pre> | ||
| − | As this is a non-destructive operation, and dirty objects are not freeable, the user should run "sync" first in order to make sure all cached objects are freed. | + | As this is a non-destructive operation, and dirty objects are not freeable, the user should run "sync" first in order to make sure all cached objects are freed. |
| + | |||
| + | Run every 2 hour | ||
| + | <pre>nano /etc/crontab | ||
| + | |||
| + | 0 */2 * * * root echo 3 > /proc/sys/vm/drop_caches</pre> | ||
| + | |||
| + | <pre> | ||
| + | #!/bin/bash | ||
| + | # Note, we are using "echo 3", but it is not recommended in production instead use "echo 1" | ||
| + | echo "echo 3 > /proc/sys/vm/drop_caches" | ||
| + | </pre> | ||
| + | <pre> | ||
| + | chmod 755 clearcache.sh | ||
| + | crontab -e | ||
| + | </pre> | ||
| + | Append the below line, save and exit to run it at 1am daily. | ||
| + | <pre> | ||
| + | 0 1 * * * /path/to/clearcache.sh | ||
| + | </pre> | ||
==========================<br> | ==========================<br> | ||
Latest revision as of 11:41, 11 January 2017
Clear Memory Linux
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 not freeable, the user should run "sync" first in order to make sure all cached objects are freed.
Run every 2 hour
nano /etc/crontab 0 */2 * * * root echo 3 > /proc/sys/vm/drop_caches
#!/bin/bash # Note, we are using "echo 3", but it is not recommended in production instead use "echo 1" echo "echo 3 > /proc/sys/vm/drop_caches"
chmod 755 clearcache.sh crontab -e
Append the below line, save and exit to run it at 1am daily.
0 1 * * * /path/to/clearcache.sh
==========================
