[CentOS] pdflush kernel thread pops up every 10 seconds or so and video decoding grinds to a halt for 1/2 a second

Aleksey Tsalolikhin atsaloli.tech at gmail.com
Wed Oct 20 18:23:19 EDT 2010


Thanks, Ross, JohnS and Lamar for your kind responses.  It turned out
my friend is using 7200 RPM disk for his write-lots-of-little-files activity
so we're looking at upgrading that to 15000 RPM or getting him a FusionIO
memory card.

Thank you!

Aleksey


On Wed, Oct 20, 2010 at 2:50 PM, Lamar Owen <lowen at pari.edu> wrote:
> On Monday, October 18, 2010 09:25:41 pm Aleksey Tsalolikhin wrote:
>> Hi. A friend of mine was doing real-time video decoding on
>> Fedora Core 13 and he had a performance glitch (1/2 a second
>> freeze) every 5-10 seconds.  "top" showed flush-253:0
>> process at the moment of the freeze.
> [snip]
>> He also tried CentOS 5.5, and saw a "pdflush" process popping
>> up with the same frequency, and resulting in a similar glitch.
>>
>> Any other suggestions?
>
> What kind of hard drive is this?  How is/are your drive(s) set up?
>
> You need the iostat program (in the sysstat package, I think) to give you more detail; there are some pointers to its use in this list's archives.
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