<div dir="ltr">+ gluster-devel<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, May 17, 2017 at 10:50 PM, mabi <span dir="ltr"><<a href="mailto:mabi@protonmail.ch" target="_blank">mabi@protonmail.ch</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>I don't know exactly what kind of context-switches it was but what I know is that it is the "cs" number under "system" when you run vmstat.<br></div><div><br></div><div>Also I use the percona linux monitoring template for cacti (<a href="https://www.percona.com/doc/percona-monitoring-plugins/LATEST/cacti/linux-templates.html" target="_blank">https://www.percona.com/doc/<wbr>percona-monitoring-plugins/<wbr>LATEST/cacti/linux-templates.<wbr>html</a>) which monitors context switches too. If that's of any use interrupts where also quite high during that time with peaks up to 50k interrupts.<br></div><div class="HOEnZb"><div class="h5"><div><br></div><div class="m_-9093338394098711715protonmail_signature_block m_-9093338394098711715protonmail_signature_block-empty"><div class="m_-9093338394098711715protonmail_signature_block-proton m_-9093338394098711715protonmail_signature_block-empty"><br></div></div><div><br></div><blockquote class="m_-9093338394098711715protonmail_quote" type="cite"><div>-------- Original Message --------<br></div><div>Subject: Re: [Gluster-users] 120k context switches on GlsuterFS nodes<br></div><div>Local Time: May 17, 2017 2:37 AM<br></div><div>UTC Time: May 17, 2017 12:37 AM<br></div><div>From: <a href="mailto:ravishankar@redhat.com" target="_blank">ravishankar@redhat.com</a><br></div><div>To: mabi <<a href="mailto:mabi@protonmail.ch" target="_blank">mabi@protonmail.ch</a>>, Gluster Users <<a href="mailto:gluster-users@gluster.org" target="_blank">gluster-users@gluster.org</a>><br></div><div><br></div><div> <br></div><div class="m_-9093338394098711715moz-cite-prefix">On 05/16/2017 11:13 PM, mabi wrote:<br></div><blockquote type="cite"><div>Today I even saw up to 400k context switches for around 30
minutes on my two nodes replica... Does anyone else have so high
context switches on their GlusterFS nodes?<br></div><div><br></div><div>I am wondering what is "normal" and if I should be worried...<br></div><div><br></div><div class="m_-9093338394098711715protonmail_signature_block m_-9093338394098711715protonmail_signature_block-empty"><div class="m_-9093338394098711715protonmail_signature_block-user m_-9093338394098711715protonmail_signature_block-empty"><div><br></div></div><div class="m_-9093338394098711715protonmail_signature_block-proton m_-9093338394098711715protonmail_signature_block-empty"><br></div></div><div><br></div><blockquote class="m_-9093338394098711715protonmail_quote" type="cite"><div>-------- Original Message --------<br></div><div>Subject: 120k context switches on GlsuterFS nodes<br></div><div>Local Time: May 11, 2017 9:18 PM<br></div><div>UTC Time: May 11, 2017 7:18 PM<br></div><div>From: <a rel="noreferrer nofollow noopener" href="mailto:mabi@protonmail.ch" class="m_-9093338394098711715moz-txt-link-abbreviated" target="_blank">mabi@protonmail.ch</a><br></div><div>To: Gluster Users <a rel="noreferrer nofollow noopener" href="mailto:gluster-users@gluster.org" class="m_-9093338394098711715moz-txt-link-rfc2396E" target="_blank"><gluster-users@gluster.org></a><br></div><div><br></div><div>Hi,<br></div><div><br></div><div>Today I noticed that for around 50 minutes my two GlusterFS
3.8.11 nodes had a very high amount of context switches,
around 120k. Usually the average is more around 1k-2k. So I
checked what was happening and there where just more users
accessing (downloading) their files at the same time. These
are directories with typical cloud files, which means files of
any sizes ranging from a few kB to MB and a lot of course.<br></div><div><br></div><div>Now I never saw such a high number in context switches in
my entire life so I wanted to ask if this is normal or to be
expected? I do not find any signs of errors or warnings in any
log files.<br></div><div><br></div></blockquote></blockquote><div class="m_-9093338394098711715protonmail_signature_block m_-9093338394098711715protonmail_signature_block-empty"><div class="m_-9093338394098711715protonmail_signature_block-user m_-9093338394098711715protonmail_signature_block-empty"><div><br></div></div></div><div>What context switch are you referring to (syscalls context-switch on
the bricks?) ? How did you measure this?<br></div><div> -Ravi<br></div><div> <br></div><blockquote type="cite"><blockquote class="m_-9093338394098711715protonmail_quote" type="cite"><div>My volume is a replicated volume on two nodes with ZFS as
filesystem behind and the volume is mounted using FUSE on the
client (the cloud server). On that cloud server the glusterfs
process was using quite a lot of system CPU but that server
(VM) only has 2 vCPUs so maybe I should increase the number of
vCPUs...<br></div><div><br></div><div>Any ideas or recommendations?<br></div><div><br></div><div class="m_-9093338394098711715protonmail_signature_block m_-9093338394098711715protonmail_signature_block-empty"><div class="m_-9093338394098711715protonmail_signature_block-user m_-9093338394098711715protonmail_signature_block-empty"><div><br></div></div><div class="m_-9093338394098711715protonmail_signature_block-proton m_-9093338394098711715protonmail_signature_block-empty"><br></div></div><div>Regards,<br></div><div>M.<br></div></blockquote><div><br></div><div><br></div><div><br></div><pre>______________________________<wbr>_________________
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