On 28.09.12 09:34, Wolfgang Winkler wrote:
Performance is really fantastic. We had an Apache reverse
proxy sitting in front of a big AOLserver site. When we
hit sustained 200 pages/sec the system broke down. We
tried to improve the AOLserver performance, until we
noticed that it was Apache which could not cope with the
load. So we switched to nginx and the system has been
working fine for more than a month now. AOLserver did all
the heavy lifting and still Apache was the bottleneck.
nice story!
Scaling ist great, too. We have servers with lots of
memory, where we can cache nearly the whole (postgres)
database in memory. Disc IO is negligible and works over a
pretty fast fiber channel SAN, so the scarce ressource is
CPU power. We noticed over the last few years, that
throwing raw CPU power, be it fast processors or lots of
cores, will improve the AOLserver performance nearly
linear. With Apache/PHP, Apache/Java or IIS/ASP.net
(shudder) not so much, to state it in friendly terms.
cpus are developing in favor of aolserver/naviserver; we
discussed this a few years ago in the openacs forum
http://openacs.org/forums/message-view?message_id=2557344
I also would mention the fast startup times of AOLserver
as an advantage. When you've ever tried to restart an
Apache/Tomcat/JBoss site, you really get to value the
difference of a startup time of seconds rather than minutes.
The only problem we have is similar to Johns occasional
crashes. But I have 2 test servers and 1 pre production
server, where AOLserver crashes with " Fatal: received
fatal signal 11" or "alloc: invalid block: 0xc595660: b0
6", somtimes even 4 or 5 times while starting up. Nearly
the same code works for other very similar installations
with much higher load.
are you using at the backend SSL?
do you have a backtrace from gdb?
-gustaf neuann
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