You made it crystal clear to me. Thanks a ton. Is psi probe available for
Ubuntu?
On Jul 15, 2015 6:56 PM, "Mark H. Wood" <mw...@iupui.edu> wrote:
> On Wed, Jul 15, 2015 at 04:51:47PM +0530, P. S. Mukhopadhyay wrote:
> > Thanks for you kind response and advices. I tried your suggestions and
> > succeeded to overcome the problem. I took following steps:
> >
> > edited /etc/default/tomcat7 file and entered :
> >
> > JAVA_OPTS="-Djava.awt.headless=true -Dfile.encoding=UTF-8 -server
> -Xms1536m
> > -Xmx1536m -XX:NewSize=256m -XX:MaxNewSize=256m -XX:PermSize=256m
> > -XX:MaxPermSize=256m -XX:+DisableExplicitGC"
> >
> > It's working now. But I do have a question. I'm running this test dspace
> in
> > a machine with 1 GB physical RAM. Is this setting of JAVA_OPTS is right?
>
> Right or wrong would be a local judgment, dependent on your load and
> your performance expectations.
>
> On a machine with 1GB physical, -Xms1536m will allow the JVM to
> request substantially more memory than is physically present. That
> can result in swapping, which will make response slower. If the
> amount of slow-down is acceptable then this is a reasonable
> configuration. If not, I'd recommend adding at least another 1GB.
>
> What I would do (and have done) is to install a resource monitor such
> as Psi Probe and examine Tomcat's use of memory regularly, making
> adjustments until it runs well with an every-day load and has some
> room to expand if there is a sudden great interest in your content. I
> try to size the physical machine to avoid swapping, but a small amount
> of swapping will not do noticeable harm to performance. On the other
> hand, I try not to give Tomcat more memory than it really needs for
> regular work and occasional demand spikes.
>
> --
> Mark H. Wood
> Lead Technology Analyst
>
> University Library
> Indiana University - Purdue University Indianapolis
> 755 W. Michigan Street
> Indianapolis, IN 46202
> 317-274-0749
> www.ulib.iupui.edu
>
>
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