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From Daniel Mikusa <>
Subject Re: Tomcat async servlet performance
Date Tue, 10 Sep 2013 23:29:59 GMT
On Sep 10, 2013, at 1:42 PM, Eitan Yarden <> wrote:

> I've been experimenting with Tomcat 7's async servlet support and comparing
> it to synchronous (plain) servlets on an EC2 m1.medium instance. I've
> configured Tomcat to use the APR connector, and the service does some
> (dummy) work for 80ms and returns an html response. I'm using Tomcat 7.0.42.
> When the thread-pool size restriction has been removed, the synchronous
> servlet spawned about 1000 threads and was able to handle up to about 2700
> requests/sec while still maintaining reasonable latency. The asynchronous
> servlet handled up to about 4500 requests/sec (I've used my own thread-pool
> for the async processing rather than the container's
> AsyncContext.start(Runnable) method).
> While certainly significant (66% increase in request rate), I had expected
> an even bigger difference between the async and sync servlets' performance.
> Has other people's experience been the same? Are there any major Tomcat
> configuration options that should be used when running async servlets?

Curious to see if you've hooked up a profiler to your tests to see where time is being spent?

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