[squid-users] stoping after rotate

[Marcus Kool]

On 09/08/2015 10:39 AM, Jorgeley Junior wrote:
> I have 8GB physical memory and my swap is 32GB.
> I didn't increase the swap yet, should I?

You must start with reading the memory FAQ: http://wiki.squid-cache.org/SquidFaq/SquidMemory

The general rule for all processes applies: make sure that a process is *not* larger than 80% of the physical memory.
In your case, you must reduce cache_mem and make sure that Squid does not use more than 6 GB.

A swap of 32 GB is fine for a system with 8 GB physical memory.

I also suggest to consider a memory upgrade.

Marcus


> 2015-09-08 9:23 GMT-03:00 Marcus Kool <marcus.kool at urlfilterdb.com <mailto:marcus.kool at urlfilterdb.com>>:
>
>
>
>     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 at urlfilterdb.com <mailto:marcus.kool at urlfilterdb.com> <mailto:marcus.kool at urlfilterdb.com <mailto:marcus.kool at urlfilterdb.com>>>:
>
>              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 at treenet.co.nz <mailto:squid3 at treenet.co.nz> <mailto:squid3 at treenet.co.nz <mailto:squid3 at treenet.co.nz>> <mailto:squid3 at treenet.co.nz
>         <mailto:squid3 at treenet.co.nz> <mailto:squid3 at treenet.co.nz <mailto:squid3 at treenet.co.nz>>>> 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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