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. -- Robert Hailey -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://emu.freenetproject.org/pipermail/devl/attachments/20080502/175c561d/attachment.html>
