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From neillott <neilmatthewl...@yahoo.com>
Subject Slow KahaDB access
Date Tue, 01 Dec 2009 16:56:29 GMT

Hi,

I know this question was posted earlier, but can anyone help here?

http://old.nabble.com/slow-KahaDB-access-td26172918.html#a26216649

I'm seeing this in my activemq log:

2009-12-01 09:29:08,690 | INFO  | Slow KahaDB access: cleanup took 9789 |
org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Journal
Checkpoint Worker
2009-12-01 09:30:36,376 | INFO  | Slow KahaDB access: cleanup took 1298 |
org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Journal
Checkpoint Worker
2009-12-01 09:47:18,871 | INFO  | Slow KahaDB access: cleanup took 14058 |
org.apache.activemq.store.kahadb.MessageDatabase | ActiveMQ Journal
Checkpoint Worker

When I benchmark the box I'm seeing this:

[myserver] /usr/local/neil/activemq > java -classpath lib/kahadb-5.3.0.jar
org.apache.kahadb.util.DiskBenchmark 
Benchmarking: /usr/local/neil/activemq/disk-benchmark.dat
Writes: 
  128000 writes of size 4096 written in 18.521 seconds.
  6911.0737 writes/second.
  26.996382 megs/second.

Sync Writes: 
  57936 writes of size 4096 written in 10.001 seconds.
  5793.0205 writes/second.
  22.628986 megs/second.

Reads: 
  1960651 reads of size 4096 read in 10.001 seconds.
  196045.5 writes/second.
  765.80273 megs/second.


What exactly do I need to do to get rid of the slow kahadb access messages?

Thanks,

Neil
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