[mythtv-users] Performance issues, or Why Mythtv hates Oprah

Yan-Fa Li yanfali at gmail.com
Thu Mar 29 01:13:19 UTC 2007

On 3/28/07, sdkovacs <sdkovacs at gmail.com> wrote:
> The Oprah Winfrey show records every day at 4pm EDT, but there is
> something on my box that is creating performance problems, and when
> Oprah is choppy, I'm in trouble(WAF). This is my setup:
> OS: Fedora Core 6, ATRPMS
> Mythtv: .20-fixes (mythtv-0.20-153.fc6.at)
> Computer: PIII-800Mhz, 384MB RAM.
> Capture Cards: PVR-350, PVR-150
> The symptom in Mythtv is that the recording intermittently skips a few
> seconds. mythbackend.log has iobound errors and Orca graphs show that
> the box is obviously stressed. I have mythtv setup to flag commercials
> immediately upon the start of the recording and I don't have any
> performance problems at any other time of day whilst recording. The
> first place I looked was cron(see output below), but there are no jobs
> running at that time. I'm looking for some tips on how to identify
> what is stressing my box - maybe a command I can put into cron that
> will identify the processes that are causing the problem.
> Thanks in advance for any help.

Check wether it's running slocate.  That hog takes up a lot of memory
and forces processes into swap.  Look at your cron.hourly, cron.daily
directories under /etc.  Redhat also tends to run sa, which keeps
track of IO statistics and what not, which you might consider turning

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