TC clustering uses GZIP(In|Out)putStream in replication. I don't know,
if there is buffering on top. Filip?
Rainer
Martin Schulz wrote:
OT: The following is advice to servlet developers rather than container
developers.
For what it's worth, just be careful when you use GZIP(In|Out)putStream,
, 2004 3:59 AM
Subject: Re: Any synchronization issues with SMP?
TC clustering uses GZIP(In|Out)putStream in replication. I don't know,
if there is buffering on top. Filip?
Rainer
Martin Schulz wrote:
OT: The following is advice to servlet developers rather than container
developers
OT: The following is advice to servlet developers rather than container
developers.
For what it's worth, just be careful when you use GZIP(In|Out)putStream,
since the native code uses a mutex (for no good reason, imho), to prevent
garbage collection from interfering with the array being used.
it appears that the JVM slows everything down to a crawl,
including the code path which should lead to another accept being
called., for up to 8 minutes!!!
Furthermore, the mpstat has the nice porperty that CPU usage adds
up to exactly 100%, i.e. a single CPU is used... no more, no less.
This
Developers List
Subject: Re: Any synchronization issues with SMP?
it appears that the JVM slows everything down to a crawl,
including the code path which should lead to another accept being
called., for up to 8 minutes!!!
Furthermore, the mpstat has the nice porperty that CPU usage adds
up to exactly 100
Hi,
we know one application running on 9 systems with 4 US II CPUs each
under Solaris 9. Peak request rates at 20 requests/second per system.
Tomcat is 4.1.29, Java is 1.3.1_09. No symptoms like yours!
You should send a signal QUIT to the jvm process during the
unresponsiveness time. This is a
Rainer,
Thanks for the tips. I am about to take timing stats
internally in the ThreadPool and the Tcp workers.
Also, the described symptoms do not disappear, but seem to be of much
shorter duration when only 4 CPUs are used for the application.
I'll summarize what I find.
Martin
Rainer Jung
