Hi Alan, See attached. The spikes are a result of a regular morning restart.
Cheers hg *Hilton Gibson* Stellenbosch University Library *http://staff.lib.sun.ac.za/~hgibson/about <http://staff.lib.sun.ac.za/~hgibson/about>* On 15 September 2015 at 16:57, Alan Orth <[email protected]> wrote: > Hey, Hilton. > > Interesting, you guys are using a pretty beefy server. I would be > interested to see your jvm stats. Our DSpace repositories are pretty > comparable (50,000–60,000 items) but you've allocated four times as much > RAM as us. Munin can monitor Tomcat's jvm heap but it doesn't work out of > the box. I've attached mine, which shows that my heap size is actually way > too large! > > Alan > > On Tue, Sep 15, 2015 at 3:40 PM, Hilton Gibson <[email protected]> > wrote: > >> Hi All, >> >> Our settings plus a Munin graph are available here: >> http://wiki.lib.sun.ac.za/index.php/SUNScholar/Prepare_Ubuntu/S05/Ubuntu-14.04#Step_5.4_Java_environment_settings_for_Tomcat_webapp_server >> >> Cheers >> >> hg >> >> *Hilton Gibson* >> Stellenbosch University Library >> *http://staff.lib.sun.ac.za/~hgibson/about >> <http://staff.lib.sun.ac.za/~hgibson/about>* >> >> >> On 15 September 2015 at 14:11, Alan Orth <[email protected]> wrote: >> >>> For reference, our DSpace has 50,000 items and runs on a server with >>> 8GiB of RAM. Right now our Tomcat's JAVA_OPTS are the following: >>> >>> -Djava.awt.headless=true -Xms4096m -Xmx4096m -XX:MaxPermSize=256m >>> -XX:+UseG1GC >>> >>> And I just checked our JVM heap usage from the system's munin graphs and >>> it looks like we are only using 2GiB, so I'm actually wasting RAM (the OS >>> could be using it for caches, but also it causes overhead for Java's >>> garbage collection)! I'll adjust that to something like 3GiB next time I >>> re-deploy. Also, I am using the new G1GC garbage collector (well, new in >>> Java 7 several years ago) but I should perhaps switch back to the default, >>> as that was a case of pre-mature optimization. >>> >>> Regards, >>> >>> Alan >>> >>> On Mon, Sep 14, 2015 at 4:11 PM, Francis Brouns <[email protected]> >>> wrote: >>> >>>> Dear Alan, >>>>> >>>> >>>> thanks for your suggestion. Indeed, 1.8G RAM is probably not enough. I >>>> did not really check available RAM when setting Tomcat. It should not be a >>>> problem to give the production server more than 2G RAM. That might solve >>>> part of the problem. >>>> >>>> I'll try to run the scripts you suggest. maybe that will give a better >>>> indication. >>>> >>>> We also will try java 7 and tomcat 7. >>>> >>>> kind regards, >>>> Francis Brouns >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "DSpace Technical Support" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To post to this group, send email to [email protected]. >>>> Visit this group at http://groups.google.com/group/dspace-tech. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> >>> >>> -- >>> Alan Orth >>> [email protected] >>> https://alaninkenya.org >>> https://mjanja.ch >>> "In heaven all the interesting people are missing." -Friedrich Nietzsche >>> GPG public key ID: 0x8cb0d0acb5cd81ec209c6cdfbd1a0e09c2f836c0 >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "DSpace Technical Support" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at http://groups.google.com/group/dspace-tech. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> > > > -- > Alan Orth > [email protected] > https://alaninkenya.org > https://mjanja.ch > "In heaven all the interesting people are missing." -Friedrich Nietzsche > GPG public key ID: 0x8cb0d0acb5cd81ec209c6cdfbd1a0e09c2f836c0 > -- You received this message because you are subscribed to the Google Groups "DSpace Technical Support" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/dspace-tech. For more options, visit https://groups.google.com/d/optout.
