<div dir="ltr"><div>I have 8GB physical memory and my swap is 32GB.<br></div>I didn't increase the swap yet, should I?<br></div><div class="gmail_extra"><br><div class="gmail_quote">2015-09-08 9:23 GMT-03:00 Marcus Kool <span dir="ltr"><<a href="mailto:marcus.kool@urlfilterdb.com" target="_blank">marcus.kool@urlfilterdb.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=""><br>
<br>
On 09/08/2015 08:11 AM, Jorgeley Junior wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Thank you all, this is the output:<br>
vm.overcommit_memory = 0<br>
vm.swappiness = 60<br>
I have a Redhat 6.6<br>
</blockquote>
<br></span>
The value of vm.overcommit_memory is OK.<br>
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.<br>
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.<br>
This implies that the OS has 15% of the physical memory available for file system buffers which is plenty.<br>
<br>
You only mentioned that the swap is 32 GB. What is the size of the physical memory ?<br>
<br>
Did you already increase the swap ?<br>
<br>
Marcus<br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
2015-09-05 15:08 GMT-03:00 Marcus Kool <<a href="mailto:marcus.kool@urlfilterdb.com" target="_blank">marcus.kool@urlfilterdb.com</a> <mailto:<a href="mailto:marcus.kool@urlfilterdb.com" target="_blank">marcus.kool@urlfilterdb.com</a>>>:<span class=""><br>
<br>
On Linux, an important sysctl parameter that determines how Linux behaves with respect to VM allocation is vm.overcommit_memory (should be 0).<br>
And vm.swappiness is important to tune servers (should be 10-15).<br>
<br>
Which version of Linux do you have and what is the output of<br>
sysctl -a | grep -e vm.overcommit_memory -e vm.swappiness<br>
<br>
Marcus<br>
<br>
<br>
On 09/04/2015 07:04 PM, Jorgeley Junior wrote:<br>
<br>
Thanks Amos, i will increase the swap<br>
<br></span><span class="">
Em 04/09/2015 17:22, "Amos Jeffries" <<a href="mailto:squid3@treenet.co.nz" target="_blank">squid3@treenet.co.nz</a> <mailto:<a href="mailto:squid3@treenet.co.nz" target="_blank">squid3@treenet.co.nz</a>> <mailto:<a href="mailto:squid3@treenet.co.nz" target="_blank">squid3@treenet.co.nz</a> <mailto:<a href="mailto:squid3@treenet.co.nz" target="_blank">squid3@treenet.co.nz</a>>>> escreveu:<br>
<br>
On 5/09/2015 7:16 a.m., Jorgeley Junior wrote:<br>
> Thanks Amos, my swap is 32GB, so that's causing the error as you said.<br>
> Which is the better choice: increase the swap size or reduce the<br>
> cache_mem???<br>
><br>
<br>
Both probably. 128 GB swap I suspect you will need.<br>
<br>
Increase the swap so the system lets Squid use more virtual memory.<br>
<br>
Decrease the cache_mem so that Squid does not actually end up using the<br>
swap for its main worker processes. That is a real killer for performance.<br>
<br>
<br>
Amos<br>
<br>
<br>
<br>
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