[mythtv-users] 0.25 SQL CPU Load issues after optimisation

martin martin at mstubbs.co.uk
Thu Jul 19 13:14:47 UTC 2012

On 17/07/12 23:48, Another Sillyname wrote:
> I recently rebuilt my system from a .23 fixes setup to a .25 fixes
> setup using the Linux Mint Mate 13 repo's.
> While setting up and tweaking the system over the last couple of weeks
> I started to notice a couple of performance 'glitches' but had other
> things I needed to get setup correctly so they got my focus.
> I've now had time to do some analysis and this problem has been
> mentioned on the list before but I can't see a clear answer to it.
> My backend is a Quad core Intel Q6700 running at 2.66Ghz and has 4GB
> of memory.  There are a couple of other services running from that
> server but it never runs at anything approaching it's load capability.
> The SQL database is becoming CPU bound on two of the cores in 'bursts'
> where two cores will peak at 100% usage for up to 50 seconds at a
> time.

I have had the same problem for a few months now. I moved the mysql 
files onto an SSD and use memory for the tmp files but it didn't get any 
better. I was wondering if the reason I have the problem and others 
don't is because my system has a lot of active channels from Freesat and 
Freeview and they are receiving continual EIT updates causing the 
scheduler to run every few minutes.

I currently just accept that mythweb and the frontend "go to sleep" for 
50 secs every few mins.


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