On 04/16/2013 06:11 PM, Scott Ferguson wrote:
> On 4/16/13 8:24 AM, Vidar Skaugen wrote:
>> Hi. We have a web app that uses quite a bit of memory, so after roughly
>> 20 instances per GB allocated memory it starts to spend more and more
>> time doing garbage collection. With enough concurrent connections it
>> grinds to a halt.
>>
>> I've been trying to limit the number of threads that are started at
>> once. <port-thread-max> seems to work for this, and does what I want
>> when I setup Resin as a http server. However I've been unable to get it
>> to work with mod_caucho. Setting <port-thread-max> in <port-default> or
>> setting port_thread_max in resin.properties does not seem to affect the
>> traffic coming in from mod_caucho.
>
> If this is for Resin 4.0, you might try <cluster-port>, which has the
> same syntax as <http> and lets you configure the 6800 port properties.
> The config looks like:
>
> <server id="a">
> <http .../>
> <cluster-port port="6800">
> <port-thread-max>20</port-thread-max>
> </cluster-port>
> ...
>
> If you're in a clustered environment, that limit might cause problems
> with the clustering.
Thank you very much for the reply Scott. I wasn't aware that was an
option. After extrapolating from your reply I ended up using:
<server id="nettskjema-1" address="127.0.0.1" port="6800">
<port-default>
<port-thread-max>20</port-thread-max>
</port-default>
</server>
Also, sorry for the late reply. I've been testing it quite a bit since
there's still a problem somewhere with an occasional response getting
dropped, but I'm pretty sure now that the port-thread-max bit works
perfectly and it's an unrelated issue (there are quite a few places if
could happen since it goes through apache and mod_caucho before reaching
resin).
Regards
- Vidar Engh Skaugen
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