Clear cache memory
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This document details a method to clear memory cache on Ubuntu using Backtrack 5 R2. It describes system specifications, memory usage statistics, and provides a script to efficiently manage memory by clearing caches. The conclusion emphasizes that every Linux OS has an efficient memory management system that can be manually triggered to free up cache.
![Clear Memory Cache on Ubuntu
I'am use backtrack 5 R2 linux operating system, sometime my computer often find my memory full
using process and services system. Here I will share trick to make efficient memory management
system with clear memory, as like other article almost the same for the script using. My computer
specification version detail as below :
root@bt:/opt/nessus/sbin# lscpu
Architecture: i686
CPU op-mode(s): 64-bit
CPU(s): 2
Thread(s) per core: 1
Core(s) per socket: 2
CPU socket(s): 1
Vendor ID: AuthenticAMD
CPU family: 20
Model: 2
Stepping: 0
CPU MHz: 780.000
Virtualization: AMD-V
L1d cache: 32K
L1i cache: 32K
L2 cache: 512K
And details using kernel Linux bt 2.6.39.4 / i686 GNU/Linux.
Show Memory Process
the computer has memory process are running on operating system, we can check using some
command the following :
counting total service on system :
root@bt:service --status-all | wc -l
[ ? ] vboxdrv
[ ? ] vboxweb-service
[ ? ] vmware-USBArbitrator
[ ? ] wpa-ifupdown
27
And information details process memory using command top are result as below :
top - 11:20:00 up 4:25, 6 users, load average: 0.26, 0.72, 0.81
Tasks: 177 total, 2 running, 173 sleeping, 0 stopped, 2 zombie
Cpu(s): 31.3%us, 7.8%sy, 1.8%ni, 57.3%id, 1.3%wa, 0.0%hi, 0.5%si, 0.0%st
Mem: 3612432k total, 3486996k used, 125436k free, 283264k buffers
Swap: 2353516k total, 548k used, 2352968k free, 1547248k cached
information peak memory usage :
root@bt:/usr/bin/time -v ls /
bin cdrom etc initrd.img lost+found mnt opt proc sbin share sys usr vmlinuz
boot dev home lib media NONE pentest root selinux srv tmp var
Command being timed: "ls /"
User time (seconds): 0.00
System time (seconds): 0.00
Percent of CPU this job got: 50%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.00
Average shared text size (kbytes): 0
…..etc](https://image.slidesharecdn.com/clearcachememory-130908235705-/85/Clear-cache-memory-1-320.jpg)
Clear cache memory
- 1. Clear Memory Cache on Ubuntu I'am use backtrack 5 R2 linux operating system, sometime my computer often find my memory full using process and services system. Here I will share trick to make efficient memory management system with clear memory, as like other article almost the same for the script using. My computer specification version detail as below : root@bt:/opt/nessus/sbin# lscpu Architecture: i686 CPU op-mode(s): 64-bit CPU(s): 2 Thread(s) per core: 1 Core(s) per socket: 2 CPU socket(s): 1 Vendor ID: AuthenticAMD CPU family: 20 Model: 2 Stepping: 0 CPU MHz: 780.000 Virtualization: AMD-V L1d cache: 32K L1i cache: 32K L2 cache: 512K And details using kernel Linux bt 2.6.39.4 / i686 GNU/Linux. Show Memory Process the computer has memory process are running on operating system, we can check using some command the following : counting total service on system : root@bt:service --status-all | wc -l [ ? ] vboxdrv [ ? ] vboxweb-service [ ? ] vmware-USBArbitrator [ ? ] wpa-ifupdown 27 And information details process memory using command top are result as below : top - 11:20:00 up 4:25, 6 users, load average: 0.26, 0.72, 0.81 Tasks: 177 total, 2 running, 173 sleeping, 0 stopped, 2 zombie Cpu(s): 31.3%us, 7.8%sy, 1.8%ni, 57.3%id, 1.3%wa, 0.0%hi, 0.5%si, 0.0%st Mem: 3612432k total, 3486996k used, 125436k free, 283264k buffers Swap: 2353516k total, 548k used, 2352968k free, 1547248k cached information peak memory usage : root@bt:/usr/bin/time -v ls / bin cdrom etc initrd.img lost+found mnt opt proc sbin share sys usr vmlinuz boot dev home lib media NONE pentest root selinux srv tmp var Command being timed: "ls /" User time (seconds): 0.00 System time (seconds): 0.00 Percent of CPU this job got: 50% Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.00 Average shared text size (kbytes): 0 …..etc
- 2. Conky Monitoring Conky is application to show information usage some service system, RAM, hardisk and information download and upload our connection. As bellow picture are showing information RAM use 96%. Script clear memory create file name clear.cache on text editor and copy this script. #!/bin/sh sh -c "sync; echo 3 > /proc/sys/vm/drop_caches" give file access to the file using comman chmod +x (file clear.cache) root@bt:~# chmod + clear.cache Result Clear Cache memory Now we trying running script : root@bt:~# ./cache root@bt:~# and then we can show usage memory back to down. Conclusion/opinion Every Linux OS has an efficient memory management system used to clear the buffer cache periodically. You can manually free up the memory cache with the following simple references : http://www.linux.com http://www.linuxtoday.com/ http://www.conky.sourceforge.net/ http://stackoverflow.com