On Friday 02 May 2008 16:24, Robert Hailey wrote: > > On May 2, 2008, at 9:59 AM, j16sdiz at freenetproject.org wrote: > > > Author: j16sdiz > > Date: 2008-05-02 14:59:50 +0000 (Fri, 02 May 2008) > > New Revision: 19683 > > > > Modified: > > trunk/freenet/src/freenet/store/BerkeleyDBFreenetStore.java > > Log: > > oomhook: lower database cache size > > > > > > Modified: trunk/freenet/src/freenet/store/BerkeleyDBFreenetStore.java > > =================================================================== > > --- trunk/freenet/src/freenet/store/BerkeleyDBFreenetStore.java > > 2008-05-02 14:59:29 UTC (rev 19682) > > +++ trunk/freenet/src/freenet/store/BerkeleyDBFreenetStore.java > > 2008-05-02 14:59:50 UTC (rev 19683) > > @@ -25,6 +25,7 @@ > > import com.sleepycat.je.DatabaseNotFoundException; > > import com.sleepycat.je.Environment; > > import com.sleepycat.je.EnvironmentConfig; > > +import com.sleepycat.je.EnvironmentMutableConfig; > > import com.sleepycat.je.LockMode; > > import com.sleepycat.je.OperationStatus; > > import com.sleepycat.je.RunRecoveryException; > > @@ -2247,6 +2248,11 @@ > > keysFC.force(true); > > if (lruFC != null) > > lruFC.force(true); > > + > > + EnvironmentMutableConfig dbmc = environment.getMutableConfig(); > > + long cacheSize = (long) (dbmc.getCacheSize() * .9); // we have > > 6 > > databases, 0.9^6 = 0.53 > > + dbmc.setCacheSize(cacheSize); > > + Logger.normal(this, "low memory, set db cache = " + cacheSize); > > } > > > > What is the significance of 0.9^6=0.53? It seems to me if you are > trying to half the memory usage, all the caches would have to be > reduced by 0.5; otherwise the comment could be made a bit more clear.
Be careful not to adjust it down to zero. Setting the max database memory to 0 currently sets it unlimited, resulting in full GCs every <10 seconds which last for ~ 3 seconds... -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 189 bytes Desc: not available URL: <https://emu.freenetproject.org/pipermail/devl/attachments/20080503/fa837e54/attachment.pgp>
