I think I might have found the problem here.. :/ thread_pool_add_delay
the doco says that the values are in milliseconds but if I set this to 2 (which should be 2ms) it makes the server handle traffic very badly and only very gradually increases perfomance.. However if I set this to 0 then everything runs immediately and well. Furthermore in the docs it says: Reducing the add_delay lets you create threads faster which is essential - specially at startup - to avoid filling up the queue and dropping requests. which would exactly fit my (sad) scenario below.. Could anybody confirm that the value is in milliseconds and not in seconds? thanks v On Wed 11 Nov 2015 09:52:52, Viktor Villafuerte wrote: > I'm bumping this 'thread' up to the top since CJ Ess has just asked a > question related to threads also.. I hate doing this but I'm hoping that > somebody could (maybe) answer this too..? > > v > > On Mon 12 Oct 2015 15:17:05, Viktor Villafuerte wrote: > > Hi all you carpenters and other Varnish using folk, > > > > There are couple of things in the output of varnishstat that puzzle me a > > little.. > > > > MAIN.sess_drop 0 0.00 Sessions dropped > > MAIN.sess_dropped 3809332 0.32 Sessions dropped for > > thread > > MAIN.fetch_no_thread 58746 0.01 Fetch failed (no > > thread) > > MAIN.pools 2 . Number of thread pools > > MAIN.threads 1255 . Total number of > > threads > > > > I've got 2 pools of 4000 threads set in Varnish config and > > man varnish-counters says: > > > > sess_drop > > Count of sessions silently dropped due to lack of worker thread. > > > > sess_dropped > > Number of times session was dropped because the queue were too long > > already. See also parameter queue_max. > > > > fetch_no_thread > > beresp fetch failed, no thread available > > > > > > This tells me that there's no lack of worker threads (good!), but the > > thread queue length does get too long and subsequently sessions get > > dropped (bad!). Also backend fetch failed due to no threads being > > available (what?) > > > > > > Now the puzzling bit :) > > > > 1) why would the thread queue get too long if there seems to be NO lack > > of threads to use? > > > > 2) why would there be no threads if there seems to be NO lack of threads > > > > 3) 'See also the parameter queue_max' - but I cannot find any mention of > > such parameter anywhere around? Where does this ellusive paramater live > > then? > > > > > > Could anybody shed bit of light on this for me? > > > > > > > > > > -- > > Regards > > > > Viktor Villafuerte > > Optus Internet Engineering > > t: +61 2 80825265 > > > > _______________________________________________ > > varnish-misc mailing list > > [email protected] > > https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc > > -- > Regards > > Viktor Villafuerte > Optus Internet Engineering > t: +61 2 80825265 > > _______________________________________________ > varnish-misc mailing list > [email protected] > https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc -- Regards Viktor Villafuerte Optus Internet Engineering t: +61 2 80825265 _______________________________________________ varnish-misc mailing list [email protected] https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
