On Fri, Oct 26, 2012 at 11:04 PM, Shawn Heisey <s...@elyograg.org> wrote: > Warming doesn't seem to be a problem here -- all your warm times are zero, > so I am going to take a guess that it may be a heap/GC issue. I would > recommend starting with the following additional arguments to your JVM. > Since I have no idea how solr gets started on your server, I don't know > where you would add these: > > -Xmx4096M -Xms4096M -XX:NewRatio=1 -XX:+UseParNewGC -XX:+UseConcMarkSweepGC > -XX:+CMSParallelRemarkEnabled >
Thanks. I've added those flags to the Solr line that I use to start Solr. Those are Java flags, not Solr, correct? I'm googling the flags now, but I find it interesting that I cannot find a canonical reference for them. > This allocates 4GB of RAM to java, sets up a larger than normal Eden space > in the heap, and uses garbage collection options that usually fare better in > a server environment than the default.Java memory management options are > like religion to some people ... I may start a flamewar with these > recommendations. ;) The best I can tell you about these choices: They made > a big difference for me. > Thanks. I will experiment with them empirically. The first step is to learn to read the debug info, though. I've been googing for days, but I must be missing something. Where is the information that I pasted in pastebin documented? > I would also recommend switching to a Sun/Oracle jvm. I have heard that > previous versions of Solr were not happy on variants like OpenJDK, I have no > idea whether that might still be the case with 4.0. If you choose to do > this, you probably have package choices in Ubuntu. I know that in Debian, > the package is called sun-java6-jre ... Ubuntu is probably something > similar. Debian has a CLI command 'update-java-alternatives' that will > quickly switch between different java implementations that are installed. > Hopefully Ubuntu also has this. If not, you might need the following > command instead to switch the main java executable: > > update-alternatives --config java > Thanks, I will take a look at the current Oracle JVM. -- Dotan Cohen http://gibberish.co.il http://what-is-what.com
