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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Tomcat 7.0.67 vs. 7.0.62: any reason why 67 might be slower?
Date Wed, 01 Feb 2017 22:24:27 GMT
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James,

On 2/1/17 3:59 PM, James H. H. Lampert wrote:
> This is a long-shot, but . . .
> 
> One of our customer installations is running slow, for no apparent 
> reason. For example, a very simple BIRT report running in our
> webapp takes 6 seconds to run in this installation, whereas an
> essentially identical one takes only one second on another
> customer's installation.
> 
> The one that's running slow is running under Tomcat 7.0.67, whereas
> the one that's fast is running under 7.0.62.
> 
> Is there anything that happened between those two releases that
> could slow things down?

Between two separate customers? I'm blame the underlying database,
since that's where BIRT is doing most of its work. Slower hardware?
More records? Thrashing in-memory caches? It could be anything. I'm
not inclined to blame Tomcat.

If you want to benchmark Tomcat, throughput is really the only thing
you care about: the overhead that Tomcat adds to the "real work" you
are trying to accomplish.

If it really takes 6 seconds to get a completed response, run the
report and take a few thread dumps during that time. It will let you
know what the Java threads are doing. I suspect they will be waiting
on data from the JDBC driver.

- -chris
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