I have 8GB physical memory and my swap is 32GB.
I didn't increase the swap yet, should I?2015-09-08 9:23 GMT-03:00 Marcus Kool <marcus.kool@xxxxxxxxxxxxxxx>:
On 09/08/2015 08:11 AM, Jorgeley Junior wrote:
Thank you all, this is the output:
vm.overcommit_memory = 0
vm.swappiness = 60
I have a Redhat 6.6
The value of vm.overcommit_memory is OK.
The default value for vm.swappiness is way too high. It means that Linux swaps out parts of processes when they are idle for a while.
For better overall system performance, you want those processes in memory as long as possible and not swapped out so I recommend to change it to 15.
This implies that the OS has 15% of the physical memory available for file system buffers which is plenty.
You only mentioned that the swap is 32 GB. What is the size of the physical memory ?
Did you already increase the swap ?
Marcus
2015-09-05 15:08 GMT-03:00 Marcus Kool <marcus.kool@xxxxxxxxxxxxxxx <mailto:marcus.kool@xxxxxxxxxxxxxxx>>:
On Linux, an important sysctl parameter that determines how Linux behaves with respect to VM allocation is vm.overcommit_memory (should be 0).
And vm.swappiness is important to tune servers (should be 10-15).
Which version of Linux do you have and what is the output of
sysctl -a | grep -e vm.overcommit_memory -e vm.swappiness
Marcus
On 09/04/2015 07:04 PM, Jorgeley Junior wrote:
Thanks Amos, i will increase the swap
Em 04/09/2015 17:22, "Amos Jeffries" <squid3@xxxxxxxxxxxxx <mailto:squid3@xxxxxxxxxxxxx> <mailto:squid3@xxxxxxxxxxxxx <mailto:squid3@xxxxxxxxxxxxx>>> escreveu:
On 5/09/2015 7:16 a.m., Jorgeley Junior wrote:
> Thanks Amos, my swap is 32GB, so that's causing the error as you said.
> Which is the better choice: increase the swap size or reduce the
> cache_mem???
>
Both probably. 128 GB swap I suspect you will need.
Increase the swap so the system lets Squid use more virtual memory.
Decrease the cache_mem so that Squid does not actually end up using the
swap for its main worker processes. That is a real killer for performance.
Amos
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