[Deploying Sakai] [Building Sakai] Solaris Architecture Affects Performance?
Branden Visser
branden at uwindsor.ca
Wed Jan 27 14:08:29 PST 2010
mizematr at notes.udayton.edu wrote:
>
> We recently completed a year long process to migrate our users off of
> WebCT CE 4.1 and onto Sakai 2.6.1. The transition went well and for the
> most part, our Faculty and Students are very happy with Sakai, but there
> has been one complaint: "Sakai seems slower than WebCT." At first we
> didn't take this too seriously, figuring it was a relative thing and
> users would soon become used to it, but as we looked into it, we found
> that our instance of Sakai was not just slower than our instance of
> WebCT, it was slower than instances of Sakai at other schools in the
> community. We've been working on this problem for the past several
> months, and believe we have finally found a major part of the problem,
> the Solaris architecture.
>
> When we bought a box for our Sakai installation, we bought one of the
> latest and greatest Solaris machines at the time, a Sun Blade T6300 and
> we think this is the problem. One of our Solaris admins found a report
> that some applications cannot leverage the architecture of the T6300 and
> will in fact run slower on the new architecture over the older
> architecture. We setup two test machines on the older architectures and
> repeatedly loaded a gradebook with 50 students and 44 columns, with
> these findings:
>
In the past, our appserver cluster has been a split between T2000's and
a T5120. I didn't run benchmarks to pit them against each other, but our
load-balancer consistently favoured the tomcat instances on the T5120,
which is a sign that it is yielding a quicker response. Besides, they're
both sun4v, so I guess it's a bit irrelevant.
Did you happen to spit out the GC work a-la:
-verbose:gc -XX:+PrintGCTimeStamps -XX:+PrintGCDetails
-XX:+PrintTenuringDistribution -Xloggc:$CATALINA_HOME/logs/gclog.out
? This could give some leads if the garbage collectors are simply
reacting differently and causing more pauses.
Branden
> Hostname: sakaitest
> Database: Oracle, sktest
> uname -m: sun4v
> Median Speed: 4.46s
>
> Hostname: kaylee
> Database: Oracle, sktest
> uname -m: sun4u
> Median Speed: 2.71s
>
> Hostname: river
> Database: Oracle, sktest
> uname -m: i86pc
> Median Speed: 1.50s
>
> So, my questions are:
>
> Has anyone else seen behavior like this?
> Are we just missing a setting for Java on the sun4v chipset?
> Solaris schools, what kind of architecture are you running?
>
> Any information/thoughts would be much appreciated.
> ---------------------------------------------------------------------------
> Matt Mize, Systems Administrator
> - Pay no attention to the man in the back office....
> Matt.Mize at notes.udayton.edu
> (937) 229-1024
>
> UDit Department, University of Dayton
> 300 College Park, Dayton, OH, 45469-1302
>
>
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