MYSQL/HTTPD resource issues in 5020

[Tom Elliott]

@Adam-Taylor WHen I get back to a normal schedule at work, I’d love to link up and run a Teamviewer connection with you.

It seems, to me, that this isn’t something I’ve been causing, directly. For some time I had some issues, but I have a person who has around 6k hosts and was seeing the resource problems as described. I have confirmed with him that this is now fixed. Now that doesn’t mean an issue still doesn’t persist, but I’m pretty sure this isn’t something FOG is doing any more.

[Adam Taylor]

Can you ask him what OS, apache version, mysql version he is running for a can compare?

Thanks,

Adam

[Adam Taylor]

Question.

Would the old fog client be causing this? We noticed the new MSI fog client but we are still running the old one.

Adam

[Trevelyan]

I’ve noticed that first thing in the morning, our server is fine. Its only when PCs start powering up that we see issues - but it isn’t even a hundred that cause it. Just loads and loads of high-CPU hogging apache2 instances that never seem to end.

For the record - all of these are new clients (we have no PCs running the old client anymore)

[Sebastian Roth]

Are you both running the latest SVN? Would be very interesting to see what is going on within those lots of processes! Maybe you could try using strace (option -p to attach to a running process, -o to write to a file) to see what is going on. I am aware of this being an advanced debugging issue and I am not sure if you are keen enough to get into this. Maybe give it a try and well see what we get. I am more than happy to take a look if you upload a strace log file.

[d4rk3]

I am also experiencing this. This includes random revisions ranging from r4982 - r5080.

[Joseph Hales]

I am also still seeing this on this mornings SVN 5082 on ubuntu 14.

It does not affect the storage node whose cpu load is around 1. Here is TOP of the main server.

lsof -i :80 output
lsof output.txt

[Joseph Hales]

Should this thread be marked solved or should I start a new thread.

[Sebastian Roth]

Maybe it is a good idea to start a (combined) new thread on this issue. Tom and I have been thinking and trying a lot but are unable to reproduce this issue. Probably because we only have a couple to a few dozens of clients to test with. Unfortunately I think we need you - @Adam-Taylor, @Joseph-Hales and @Raymond-Bell - to get into the details of debugging this. I am still not quite sure how we are going to get there. Here are some ideas:

• Check the output of apache2 -V or httpd -V for “Server MPM”, is it Worker or Prefork??
• Apache server status http://fog-ip/server-status (might be enabled already but only accessable from localhost - check out the apache mod-configs)
• Mysql logging, a good talk about this: http://stackoverflow.com/questions/568564/how-can-i-view-live-mysql-queries
• mysqladmin -u root -p -i 1 processlist;
• Tools like mytop and mtop (http://www.tecmint.com/mysql-performance-monitoring/)

Just a few ideas. Probably best to start a new thread and get into the details with this.

[Joseph Hales]

@Uncle-Frank said:

mysqladmin -u root -p -i 1 processlist;

New thread started here
https://forums.fogproject.org/topic/6020/fog-svn-5020-and-above-cpu-hammered-thread/1