Thanks Jochen and Frederik for these tips - that should be plenty to get me started :)
Cheers Adam On Wed, Jun 15, 2011 at 7:33 PM, Jochen Topf <[email protected]> wrote: > On Wed, Jun 15, 2011 at 06:09:13PM +1200, Adam Ratcliffe wrote: >> We've been using mod_tile/renderd for approx. a year serving an >> australasian tile set, we will only be serving this one tile set for >> the foreseeable future. We're now looking at rebuilding our tile >> servers and I have set up a test installation running Tirex. >> >> I'm wondering if anybody is able to provide me with any guidelines on >> how to configure the buckets. Is there a relationship between the >> maxproc setting and the number of CPUs available on the host for >> instance? > > All of this of course depends on the details of your hardware, the map data > you have, the number of tiles, the access pattern etc. But here are some > points to get you started: > > * You probably don't want to have too many rendering processes even if you > have many CPUs, because then your bottleneck will be the database disk > access. > * You also, of course, don't want to few rendering processes, because you > don't want an idle machine. > * You should not use all capacities in the low priority buckets, so that > there are always capacities available if high priorities come in. > * For the highest priority bucket, your maxproc should probably be slightly > higher than the number of CPUs you have. Slightly higher because some > processes > will be waiting for IO. Maxload about twice that (1 for the renderer > process, 1 one for the datatabase process). > * For all other buckets use less. Numbers depend on your ratio of > interactively > rendered tiles vs. background-rendered tiles. If you want snappier access > for live rendering give low-priority buckets smaller maxproc/maxload, but > background-rendering will be slower. > > Start with those ideas and then watch your system and change settings > accordingly. Look at the jobs.log logfile for rendering times and success > rate. Experiment with different settings. > > Jochen > -- > Jochen Topf [email protected] http://www.remote.org/jochen/ +49-721-388298 > > _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
