Author: toad
Date: 2008-03-11 14:56:06 +0000 (Tue, 11 Mar 2008)
New Revision: 18456
Modified:
trunk/freenet/src/freenet/node/Node.java
Log:
Tune the BDBJE's maximum latency using the je.env.background* options.
We were having long pauses on the UDP handler thread caused by the whole
datastore being blocked for >10 seconds.
Modified: trunk/freenet/src/freenet/node/Node.java
===================================================================
--- trunk/freenet/src/freenet/node/Node.java 2008-03-11 14:53:36 UTC (rev
18455)
+++ trunk/freenet/src/freenet/node/Node.java 2008-03-11 14:56:06 UTC (rev
18456)
@@ -1286,9 +1286,16 @@
envConfig.setLockTimeout(600*1000*1000); // should be long
enough even for severely overloaded nodes!
// Note that the above is in *MICRO*seconds.
envConfig.setConfigParam("je.log.faultReadSize", "6144");
+ //
http://www.oracle.com/technology/products/berkeley-db/faq/je_faq.html#35
envConfig.setConfigParam("je.evictor.lruOnly", "false"); //Is
not a mutable config option and must be set before opening of environment.
envConfig.setConfigParam("je.evictor.nodesPerScan", "100");
//Is not a mutable config option and must be set before opening of environment.
+ // FIXME consider reducing nodesPerScan to reduce maximum
latency. It's a tradeoff between eviction scan accuracy and maximum latency
cost.
+ // Tune latency
+ envConfig.setConfigParam("je.env.backgroundReadLimit", "65536");
+ envConfig.setConfigParam("je.env.backgroundWriteLimit",
"65536");
+ envConfig.setConfigParam("je.env.backgroundSleepInterval",
"10000" /* microseconds */); // 10ms
+
File dbDir = new File(storeDir,
"database-"+getDarknetPortNumber());
dbDir.mkdirs();
