Re: [Dspace-tech] CPU usage when idle
I should add that this was on DSpace 5 and that APR is not on by default (requires the libtcnative-1 package). On Mon, Aug 17, 2015 at 11:39 AM, helix84 heli...@centrum.sk wrote: Hi everyone, this is just a heads-up about a problem I solved with my repository. I was getting ~60% CPU usage on all CPUs in the DSpace VM all the time, even when DSpace was idle. This is on Debian Jessie with distro packages of tomcat8 and openjdk-7-jdk:amd64. The problem went away when I turned off APR in /etc/tomcat8/server.xml. I confirmed this solution independently on 2 different DSpace instances. !-- Listener className=org.apache.catalina.core.AprLifecycleListener SSLEngine=on / -- Be aware if you define your HTTPS connector in Tomcat, it's attribute syntax changes depending on whether you are using APR (OpenSSL) or not (JSSE). Unrelated to CPU usage, I was also getting occasional Too many open files message with APR despite trying to raise the respective ulimit. They haven't appeared yet with APR turned off. If you have similar experiences, please do share them with us. Regards, ~~helix84 Compulsory reading: DSpace Mailing List Etiquette https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette -- ___ DSpace-tech mailing list DSpace-tech@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dspace-tech List Etiquette: https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette
Re: [Dspace-tech] CPU usage when idle
Hi All, Added to: http://wiki.lib.sun.ac.za/index.php/SUNScholar/Optimisations/Tomcat Cheers hg *Hilton Gibson* Ubuntu Linux Systems Administrator Stellenbosch University Library http://staff.lib.sun.ac.za/~hgibson/docs/cv/cv.html On 17 August 2015 at 11:41, helix84 heli...@centrum.sk wrote: I should add that this was on DSpace 5 and that APR is not on by default (requires the libtcnative-1 package). On Mon, Aug 17, 2015 at 11:39 AM, helix84 heli...@centrum.sk wrote: Hi everyone, this is just a heads-up about a problem I solved with my repository. I was getting ~60% CPU usage on all CPUs in the DSpace VM all the time, even when DSpace was idle. This is on Debian Jessie with distro packages of tomcat8 and openjdk-7-jdk:amd64. The problem went away when I turned off APR in /etc/tomcat8/server.xml. I confirmed this solution independently on 2 different DSpace instances. !-- Listener className=org.apache.catalina.core.AprLifecycleListener SSLEngine=on / -- Be aware if you define your HTTPS connector in Tomcat, it's attribute syntax changes depending on whether you are using APR (OpenSSL) or not (JSSE). Unrelated to CPU usage, I was also getting occasional Too many open files message with APR despite trying to raise the respective ulimit. They haven't appeared yet with APR turned off. If you have similar experiences, please do share them with us. Regards, ~~helix84 Compulsory reading: DSpace Mailing List Etiquette https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette -- ___ DSpace-tech mailing list DSpace-tech@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dspace-tech List Etiquette: https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette -- ___ DSpace-tech mailing list DSpace-tech@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dspace-tech List Etiquette: https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette
[Dspace-tech] CPU usage when idle
Hi everyone, this is just a heads-up about a problem I solved with my repository. I was getting ~60% CPU usage on all CPUs in the DSpace VM all the time, even when DSpace was idle. This is on Debian Jessie with distro packages of tomcat8 and openjdk-7-jdk:amd64. The problem went away when I turned off APR in /etc/tomcat8/server.xml. I confirmed this solution independently on 2 different DSpace instances. !-- Listener className=org.apache.catalina.core.AprLifecycleListener SSLEngine=on / -- Be aware if you define your HTTPS connector in Tomcat, it's attribute syntax changes depending on whether you are using APR (OpenSSL) or not (JSSE). Unrelated to CPU usage, I was also getting occasional Too many open files message with APR despite trying to raise the respective ulimit. They haven't appeared yet with APR turned off. If you have similar experiences, please do share them with us. Regards, ~~helix84 Compulsory reading: DSpace Mailing List Etiquette https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette -- ___ DSpace-tech mailing list DSpace-tech@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dspace-tech List Etiquette: https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette
