On 4/12/2010 12:40 PM, Christoph Zwerschke wrote:
> Am 02.12.2010 04:14 schrieb Oliver Bock:
>> I observed it using a simple Webware script that reports the number of
>> active threads and roughly what they are doing. This script is normally
>> very fast because it waits on no locks and does no database work.
>> However when the server is busy I have occasionally noticed a several
>> second delay before it returns, and when it does return I see that the
>> other threads are all busy, and that the number of threads is still just
>> 5. In fact, the number of threads is /always/ just 5, so far as I can see.
>>
>> So my question is: is this behaviour normal? Am I handling this the
>> right way?
> Hi Oliver, just looked into this.
>
> Webware comes with a servlet called "ThreadControl" in the Admin
> context. There you can see which threads are currently handling which
> requests, and how many threads are idle. When I start the appserver, it
> shows the thread handling the ThreadControl servlet, and 9 idle threads,
> as expected. Then after a while, the idle threads go down to 4, also as
> expected. Webware also also comes with a script "stress.py" in
> WebKit/Test/stress. After I tried a "stress.py 500 30 30", I saw 19 idle
> threads, slowly phasing down to 4 again, again just as expected.
>
> Can you try the same on your machine and check if you get the same behavior?
Hi Cristoph,
Thanks for your response, and sorry for the slow reply. I was at the
beach :-)
When I used stress.py I found that Webware is so fast on my server that
it rarely required more than 5 threads, to run the pages requested, even
when stress.py is running 300 "simultaneous" requests. To better
simulate my problem I created a test page that contains a time.sleep(1),
and then I found that after a second or two, Webware created many extra
threads to handle the parallel requests. I could observe this both in
my homegrown thread display script (mentioned originally) and in
ThreadControl. This test was performed on the same production machine
on which I originally observed the problem, so the only difference is
the servlets being run, which should not affect AppServer's threading
strategy!
So I do not know what to think. I will look at ThreadControl if I
observe the problem again.
Regards,
Oliver
P.S: Perhaps this text could be added to the comment at the top of
stress.py: Ensure that Examples is the default context and that your the
hostname and port for your WebKit instance is in ../../adapter.address
("localhost:8090" is the default).
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