[freenet-dev] r19683 - trunk/freenet/src/freenet/store

[Robert Hailey]

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

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