Performance problem for Xalan-J on intel-dual core 2006-11-17 - By keshlam@(protected)
We've known for a while that some part of Xalan are oversynchronized, due
to their use of the original Java heap and vector classes -- but we
couldn't move to the unsynchronized 1.2 Collection classes because we were
still committed to running on Java 1.1.8.
Now that Xerces has given up compatability with that version -- and I think
Xalan is doing likewise? -- it might be interesting to see what effect a
global replace of the old classes with their new versions would have on the
system. I don't think we're actually relying on their built-in
synchronization anywhere; the few places I can think of where we do some
inter-thread coordination are explicitly synchronized at the functional
level.
This cut-over would involve a lot of fiddling detail work, but should be
straightforward...
______________________________________
"... Three things see no end: A loop with exit code done wrong,
A semaphore untested, And the change that comes along. ..."
-- "Threes" Rev 1.1 - Duane Elms / Leslie Fish
(http://www.ovff.org/pegasus/songs/threes-rev-11.html)
<html><body>
<p>We've known for a while that some part of Xalan are oversynchronized, due to
their use of the original Java heap and vector classes -- but we couldn't move
to the unsynchronized 1.2 Collection classes because we were still committed to
running on Java 1.1.8.<br>
<br>
Now that Xerces has given up compatability with that version -- and I think
Xalan is doing likewise? -- it might be interesting to see what effect a global
replace of the old classes with their new versions would have on the system. I
don't think we're actually relying on their built-in synchronization anywhere;
the few places I can think of where we do some inter-thread coordination are
explicitly synchronized at the functional level.<br>
<br>
This cut-over would involve a lot of fiddling detail work, but should be
straightforward...<br>
<br>
______________________________________<br>
"... Three things see no end: A loop with exit code done wrong,<br>
A semaphore untested, And the change that comes along. ..."<br>
-- "Threes" Rev 1.1 - Duane Elms / Leslie Fish (<a href="http://www
.ovff.org/pegasus/songs/threes-rev-11.html">http://www.ovff.org/pegasus/songs
/threes-rev-11.html</a>)</body></html>
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