Guys,
How many processors do you have running on your system? I do not
believe that this is a JRUN or java issue but a "tread thrashing"
issue. Basically only one thread can run at any exact moment upon a
CPU. By running 100 threads at once, the machine is spending a lot of
resources upon just switching between threads than running them.
Another issue to consider is that NT's thread model is not the best
going. I just got a dual Pentium set up and it provides a little boost,
but not what I had hoped for:(
As for our PRD systems, we use some of the larger SUN systems and
they handle threading very well. After some experience we have found
out that setting more than about 20 threads to a process(not jrun in
particular) provides little benefit due to I/O & other things. This
machine though has 64 processors to utilize.
Makarand,
It sounds as if you might be upgrading your hardware to a UNIX
system to handle your load. A big perk with JSP's is that your code
won't have to change one bit:)
Dave
-----Original Message-----
From: bgroeneveld
Sent: Wednesday, October 03, 2001 6:08 PM
To: jrun-talk
Cc: bgroeneveld
Subject: Re: JRun does not responds after 100 threads
Makarand, I have seen similar behavior. I think there may be a JRun
problem. If I setup a threadpool of 50 with an idle thread timeout of
60, then after a fresh jrun startup and no activity NT perfmon shows
the threadpool gets cleaned up. Or if I send a burst of 100 persistent
connections, then after 60s the threadcount goes from 150 to 100.
I am going to try an experiment with the IBM jvm later this week to
make sure this isn't VM related.
I've had best performance leaving the threadpool at 1, even thought
that's not what's desired, my server/VM lives much longer that way.
I'm assuming that changing the threadpool causes a fault inside JRun.
Anyone know more?
BenG.
JOGALEKAR,MAKARAND (HP-Boise,ex1) wrote:
>Hello,
>
>We are having lot of problems with JRun 3.0 or Jrun3.1,
>If we get high volume and the thread count goes beyond 100, it does not
>respond.
>
>We are just using servlets with Netscape Exterprise server 3.6 with
EJB's at
>all.
>
>We have disabled the EJB option for performance and also tried
different
>options
>by setting initial thread count to 50 with maximum thread count to
500..but
>nothing works..
>
>Any help ??
>
>Thanks,
>-Makarand
>
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