java virtual machine - how does it allocate resources?

Posted by Will on Stack Overflow See other posts from Stack Overflow or by Will
Published on 2010-06-02T23:04:06Z Indexed on 2010/06/02 23:24 UTC
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Filed under:

java

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query

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jvm

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streaming

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continuous

I am testing the performance of a data streaming system that supports continuous queries.

This is how it works: - There is a polling service which sends data to my system. - As data passes into the system, each query evaluates based on a window of the stream at the current time. - The window slides as data passes in.

My problem is this, when I add more queries to the system, I should expect the throughput to decrease because it can't cope the data rate.

However, I actually observe an increase in throughput.

I can't understand why this is the case and I am guessing that it's something to do with the way the JVM allocates CPU, memory etc.

Can anyone shed any light to my problem?

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