[Simpleweb-Support] Simple Stability...

[Gail R. F. <ga...@sc...>]

Hi Niall and everyone,

As you know, I have been testing Simple for the past few weeks, trying =
to
track down a TCP error that was causing my instance to eventually hang =
all
worker threads, even under light loads.

I previously suggested a tweak to the Socket configuration (setting a
SO_LINGER timeout).=20

In the end, we found spotty documentation about a Linux 2.4.x kernel bug
that can cause sockets closed properly by the application to linger
indefinitely in CLOSE_WAIT. Updating our Red Hat distribution via Red =
Hat
Network (we paid for this service) resulted in the problem completely =
going
away.=20

I was more than surprised to find an OS bug to be at fault!

Along the way, I replaced Niall's synchronization and thread-pooling =
code
with the new JDK 5 constructs from the new and wonderful package
java.util.concurrent. I proved that Niall's software was correct =
(because we
saw the same deadlocks with the JDK 5 constructs, which have already =
been
proven correct). But, the migration to java.util.concurrent seems to =
make a
faster Simple.

I'm happy to contribute back the port to java.util.concurrent, it =
simplifies
the code...

-- Gail.

-------------
Gail Rahn Frederick
ga...@sc...
503.260.0910