[jboss-user] [JBoss Cache: Core Edition] - expected lag with INVALIDATION_ASYNC?

[dukehoops]

I am measuring cache lag in a 2-node cluster running JBC3/Hibernate with INVALIDATION_ASYNC like so:

loop:
{
1. update Entity A on cluster node N1
2. thinkTime  //account for invalidation lag
3. get Entity A from N2 (and compare to value in 1.)
4. thinkTime
}

When thinkTime gets to 30ms comparison in #3 starts to fail. This is true when N1 and N2 are on different hosts on the same subnet *and* when they're both on the same host (so network latency isn't a problem). So, it seems, the time is either spend in JGroups or jbc3 code.

Given how small the load is, 30ms seems quite high and I'd like to understand what's going on. Given the config below, what lag would you expect to see? Where do you think most of the time is spent?

My stack:
JBC 3.0.3.GA using MVCC, INVALIDATION_ASYNC
JGroups 2.7.0.GA
-using UDP multicast, multiple channels but shared transport
Tomcat 6 NIO
Hibernate 3.3.1
-using TRANSACTIONAL cache strategy
Spring 2.5.6

Hardware (single host):
3ghz intel core2 duo
4gb ram
vista






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