TimeoutHandlers consume too many resources (bug)
Dave Siracusa
dave.siracusa at yellowbook.com
Mon Feb 9 14:31:31 EST 2009
I integrated timeout handlers in my server. I exercise my server via jmeter
using 10 threads, 10 iterations. After several runs, I noticed that the
server responsiveness goes way down from 6KB/sec to <1kB/sec.
I inspected the java process in Windows 2003 Server taskmanager and found
the handle count in excess of 16k, memory at 120MB, CPU utilization > 90%
even after my tests were completed. I brought down process explorer from
sysinternals.com and inspected the native java process and noticed thousands
of native windows threads.
I receive no timeout exceptions during the tests.
I repeated the tests with the ReadTimeoutHandler and WriteTimeoutHandler
commented out and the thread count is 100-125, memory is 25MB, and CPU at 0%
minutes after the test.
The performance is faster than the with the handlers and stays consistent
from run to run.
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