[mythtv-users] Sloooow database
Curtis Stanford
curtis at stanfordcomputing.com
Wed Jun 11 17:31:55 UTC 2008
On 11-Jun-08, at 10:24 AM, Roger Heflin wrote:
> Recently on my 1GB system (I moved things from a 2.8GB to a 1GB
> system) I
> improved the database response by setting this setting with sysctl:
>
> sysctl -w vm.vfs_cache_pressure = 500
>
> This is supposed to reduce the amount of memory used for file cache
> and has
> appeared to improve my database response quite a lot. I did not see
> the issue
> at all on the 2.8GB system, but it was often a problem on the 1GB
> system, using
> this setting has appeared to correct the slow response I was having,
> I am using
> a settop device and it actually was timing out about 1/2 of the time
> when
> stopping a recording at the end (it was not having an issue on the
> 2.8GB system,
> and so far after changing the setting it has not timed out).
>
> Given that the IO patterns of transcode/viewing recordings/writing
> recordings is
> such that the data won't likely be reused from the cache soon
> enough, it makes
> sense to not push out application pages for the vfs cache.
>
Thanks Roger! I'll give that a try.
Curtis
More information about the mythtv-users
mailing list