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Commands tagged cache

Terminal - Commands tagged cache - 11 results

nocache <I/O-heavy-command>

2013-05-21 15:15:05

User: michelsberg

Tags: nice cache ionice nocache I/O cachedel cachestats

Up
Down

prevent large files from being cached in memory (backups!)

We all know...

nice -n19

for low CPU priority.

ionice -c3

for low I/O priority.

nocache can be useful in related scenarios, when we operate on very large files just a single time, e.g. a backup job. It advises the kernel that no caching is required for the involved files, so our current file cache is not erased, potentially decreasing performance on other, more typical file I/O, e.g. on a desktop.

http://askubuntu.com/questions/122857

https://github.com/Feh/nocache

http://packages.debian.org/search?keywords=nocache

http://packages.ubuntu.com/search?keywords=nocache (seems to be unavailable in ubuntu...)

To undo caching of a single file in hindsight, you can do

cachedel <OneSingleFile>

To check the cache status of a file, do

cachestats <OneSingleFile>

Comments (2) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

dscacheutil ?flushcache

2012-07-04 17:04:52

User: edshadi

Tags: dns cache flush dns flush cache

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Flush DNS in Mac OS X

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

sudo sync && sudo echo 3 | sudo tee /proc/sys/vm/drop_caches

2012-03-17 08:27:58

User: StephenJudge

Functions: echo sudo sync tee

Tags: memory cache

-2

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Clear Cached Memory on Ubuntu

"That's it. Not much to see here. The first command writes any cache data that hasn't been written to the disk out to the disk. The second command tells the kernel to drop what's cached. Not much to it. This invalidates the write cache as well as the read cache, which is why we have the sync command first. Supposedly, it is possible to have some cached write data never make it to disk, so use it with caution, and NEVER do it on a production server. You could ... but why take the risk?

As long as you are running a post 2.6.16 kernel,..."

Source: http://ubuntuforums.org/showpost.php?p=3621283&postcount=1

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

cat <file> > /dev/null

2011-11-12 15:45:27

User: totti

Functions: cat

Tags: ram file cache

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Load file into RAM (cache) for faster accessing for repeated usage

Best result when file size less than half of RAM size

Comments (3) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

kill -SIGHUP `cat /var/run/mydns.pid`

2011-10-21 14:29:24

User: ironmarc

Functions: kill

Tags: dns cache flush flush dns mydns

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clear MyDNS-ng cache

Occasionally, to force zone updating, cache flush is necessary. This command is better than restart the mydns daemon.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

rndc flush

2011-10-21 14:27:05

User: ironmarc

Functions: rndc

Tags: dns cache flush bind bind9 flush dns rndc

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Empty Bind9 cache

Occasionally, to force zone updating, cache flush is necessary. Use this command is better than restart the Bind9 process.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

sysctl -w vm.drop_caches=3

2011-10-18 18:23:38

User: sanidhya_k

Functions: sysctl

Tags: cache

Up
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Clear filesystem memory cache

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sync && echo 3 | sudo tee /proc/sys/vm/drop_caches

2011-10-18 15:22:25

User: mariusbutuc

Functions: echo sudo sync tee

Tags: cache

Up
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Clear filesystem memory cache

Found here: http://ubuntuforums.org/showthread.php?t=589975

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

sync && echo 1 > /proc/sys/vm/drop_caches

2011-06-10 07:32:28

User: KeePon

Functions: echo sync

Tags: memory ram kernel sync cache free

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clean up memory of unnecessary things (Kernerl 2.6.16 or newer)

run sync first to flush useful things out to disk!!!

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

find ~/.mozilla/firefox/*/Cache -exec file {} \; | awk -F ': ' 'tolower($2)~/mpeg/{print $1}'

2010-04-19 06:59:55

User: sata

Functions: awk file find

Tags: awk find file mp3 firefox cache

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Grab a list of MP3s out of Firefox's cache

Grab a list of MP3s (with full path) out of Firefox's cache

Ever gone to a site that has an MP3 embedded into a pesky flash player, but no download link? Well, this one-liner will yank the *full path* of those tunes straight out of FF's cache in a clean list.

Shorter and Intuitive version of the command submitted by (TuxOtaku)

for i in `ls ~/.mozilla/firefox/*/Cache`; do file $i | grep -i mpeg | awk '{print $1}' | sed s/.$//; done

2010-04-11 23:14:18

User: TuxOtaku

Functions: awk file grep sed

Tags: sed awk flash grep file mp3 firefox for mpeg cache

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Grab a list of MP3s out of Firefox's cache

Ever gone to a site that has an MP3 embedded into a pesky flash player, but no download link? Well, this one-liner will yank the names of those tunes straight out of FF's cache in a nice, easy to read list. What you do with them after that is *ahem* no concern of mine. ;)