hum, does the new option in kernel 3.10 about SO_REUSEPORT, could allow a better new connection performace? or it doesn't make any sense?
https://lwn.net/Articles/542629/ http://linux.dell.com/files/presentations/Linux_Plumbers_Conf_2010/Scaling_techniques_for_servers_with_high_connection%20rates.pdf 2013/8/18 dormando <dorma...@rydia.net>: >> Hi,Since the best performance are usually achieved with #threads = #cores >> and its recommended to run memcached with #worker_threads = #cores. >> I was wondering why does memcached have a specific thread to accept new >> connections rather than have the worker threads accept new connections? >> >> One possible explanation I found is the Thundering_herd_problem. But I would >> imagine that CPU cycles would be wasted on accept only on otherwise idle >> core which I would Imagine is not an issue for most installations, am I >> wrong? >> >> I was wondering If any one could elaborate on this? Was it discussed in the >> past? Is accepting new connections a rare enough event that it doesn't make >> a difference? >> >> Thanks, >> Ilya > > It's been that way for a long, long time. It does help with the thundering > heard problem, and tests over the years have shown that it still performs > better that way. > > If some day the opposite becomes true, we either switch back or add an > option. > > The foruma is 'worker_threads =~ cores', just pretend the accept thread > doesn't count unless your workload never uses persistent connections. > There're also some background threads that're usually idle and won't count > to that total. > > -- > > --- > You received this message because you are subscribed to the Google Groups > "memcached" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to memcached+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. -- Roberto Spadim -- --- You received this message because you are subscribed to the Google Groups "memcached" group. To unsubscribe from this group and stop receiving emails from it, send an email to memcached+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
