So is the main issue the amount of shm used, right? > On Dec 19, 2014, at 5:04 AM, Sylvain Goulmy <sygoulmy@xxxxxxxxx> wrote: > > Hi Yann, > > Thank you for your feedback. > > My configuration is currently defining 338 virtual hosts and 169 proxy balancers. > > The balancers are defined in the main section. Each virtual host refers only one balancer. > > Here what i notice : > - Apache creates one shm for each balancer > - Each virtual hosts creates one shm for each balancer even if it doesn't refer it... > > Am i missing a directive that could avoid that behaviour or do i have to redesign my all configuration by moving each balancer definition at the virtual host level ? > > Thanks in advance. > Regards. > > Sylvain > > > On Fri, Dec 19, 2014 at 12:06 AM, Yann Ylavic <ylavic.dev@xxxxxxxxx> wrote: > If you can manage to recompile the APR library used by your Apache 2.4 > (you probably did that already since 2.4 does not seem to be the > version packaged with RHEL 6.4), you can use "./configure > --enable-posix-shm ..." to use another shared memory mechanism than > the default one (IPC SysV) which is limited to 32K segments (system > wide). > The number of segments would then be limited by the usual number of > file descriptors per process (ulimit -n). > > Unfortunately, there no equivalent to the Mutex directive for shared > memories, this can't be changed by httpd's configuration (as far as I > know). > > On Thu, Dec 18, 2014 at 2:30 PM, Sylvain Goulmy <sygoulmy@xxxxxxxxx> wrote: > > > > I also noticed that a single proxy_balancer creates almost 350 shm on the > > system. > > > > Is it normal that a single proxy_balancer creates so many shm ? > > How many VirtualHost(s) do you use in your configuration? > Also, how do you declare the balancer(s), in each VirtualHost or in > the main section using BalancerInherit on? > > > > > Do i really have to increase the memory segment on my system in huge > > proportion to handle all my proxy_balancers ? > > The number of IPC SysV shared-memory segments is limited to 32768 on > linux (system wide), and you are already above with 100 * 350, so you > would need to use another SHM mechanism. > Unfortunately, there no equivalent to the Mutex directive for shared > memories, AFAIK this can't be changed by httpd's configuration. > So you would have to recompile the APR library used by your Apache 2.4 > (you probably did that already since RHEL 6.4 does not seem to package > 2.4 by default), and do for example "./configure --enable-posix-shm > ..." to use another shared-memory mechanism. > The number of segments would then be limited by the usual number of > file descriptors per process (ulimit -n). > > However 350 shm per balancer looks weird to me, your configuration may > do something not optimal... > > Regards, > Yann. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx > For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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