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From Pid <...@pidster.com>
Subject Re: parallel webapp initialization
Date Wed, 25 Jan 2012 09:24:26 GMT
On 24/01/2012 21:01, David Rees wrote:
> On Mon, Jan 23, 2012 at 11:53 PM, Pid * <pid@pidster.com> wrote:
>> On 23 Jan 2012, at 21:12, David Rees <drees76@gmail.com> wrote:
>>> On Tue, Oct 11, 2011 at 6:42 AM, Mark Thomas <markt@apache.org> wrote:
>>>> I have added a patch based on the previous patches that adds:
>>>> - threaded start/stop for Contexts
>>>> - threaded start/stop for Hosts
>>>> - threaded deployment
>>>>
>>>> Control over the number of threads is via server.xml and/or JMX. This
>>>> can be changed dynamically.
>>>>
>>>> Review, feedback, testing etc. welcome.
>>>>
>>>> With 4 threads rather than the current 1 (on a 8-core machine), I saw a
>>>> 20-25% improvement in start time with a large number of Contexts that
>>>> all start quickly. I'd expect to see better results in situations where
>>>> 1 few Contexts start slowly but most are quick.
>>>
>>> Resurrecting an old thread, but I've started using this in Tomcat
>>> 7.0.25 with good results - have a Tomcat instance used for testing
>>> with a couple dozen contexts that take a while to load each, but with
>>> startStopThreads bumped up it reduces startup time from 60 seconds to
>>> 20 seconds using all available CPU cores.  Very helpful!
>>
>> That's great - and thanks for letting us know.
>>
>> If you have time, I think it would be interesting to know your
>> application sizes, individual startup time and how many
>> startStopThreads you are using.
> 
> On this example there's about 30 webapps, each war file ranges between
> 30-60MB.  Single threaded startup, each application takes about 2
> seconds to start up.  This is on a warm restart, webapps already
> deployed, cold restarts are slower if the server has to read from
> disk.

Awesome, thanks.

> The system has 8 CPU cores, Opteron 2378 CPU.  Going beyond 4
> startStopThreads for the host where the webapps are deployed doesn't
> speed things up much more as it appears that the webapps can use up to
> 2 cores when initializing as seen in single threaded startup mode.

In single threaded startup mode, the process uses 2 cores?

You refer to system and host separately, is it virtualised?

> Going to 6 threads pretty much maxed it out, but I've left it set to 7.

:)


p


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