On Thu, 30 Dec 2010, Martijn de Munnik wrote:
I know that I can run a lot of PHP processes in parallel. But that
is only interesting for me as server admin. When a scripts takes 5
seconds to run a customer doesn't care that we can run 100 of them
in parallel. I know PHP is single threaded but I didn't expect
poorer performance of a T5120 compared to a X2100M2.
Now you know. :-)
SPARC T-series is best for running highly-threaded apps like Java
servelets or specially coded multi-threaded applications. It is poor
for large monolithic lumbering legacy software, which is ill prepared
for the future. I was astonished to learn how well the image
processing package I maintain (highly threaded) runs on SPARC T2.
Due to the threading, the SPARC T2 was able to offer similar total
performance to AMD Opteron systems sold at the same point in time.
I'm now trying to optimize the compilation of PHP but I don't expect
huge amounts of improvements. There seems to be a bug in APC on
Sparc http://pecl.php.net/bugs/bug.php?id=17088 so I can't use APC
to improve the performance. I haven't tried xcache jet.
Note that this bug report included a compiler option which allows the
software to still work without crashing. The code will execute less
efficiently but this might not matter if the unaligned access does
not occur very often.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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