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From Mark Thomas <>
Subject Re: Strange wait time in my application - Tomcat 7.0.67
Date Mon, 03 Oct 2016 12:12:18 GMT
On 03/10/2016 11:19, Tullio Bettinazzi wrote:
> I already use Yourkit but it doesn't seems a load problem.
> The delay is not spread over all operaions but concentred in only one or two and allways
takes 4 secs more than the normal operation  time.
> Could You suggest how to use Yourkit in this schenario ?

I'd look at GC activity and detailed CPU profiling.


> Tks
> Tullio
> ________________________________
> Da: Mark Thomas <>
> Inviato: lunedì 3 ottobre 2016 10.39
> A: Tomcat Users List
> Oggetto: Re: Strange wait time in my application - Tomcat 7.0.67
> On 03/10/2016 08:56, Tullio Bettinazzi wrote:
>> I've an application under tomcat.
>> When only a one or two users works on it everithing is ok.
>> When the number of users grows the application slows down.
>> Is not a memory nor a cpu problem : using top I see the system resources quite free.
>> I don't see relevant garbage collection : heap size and permgen have correct dimentions.
>> No other applications are running on the system.
>> I log more or less every relevant operation in my system (db query and so on) and
I see that every slowdown is concentered in a single operation.
>> I mean all operations take "normal" time but one or two of them take 4 seconds more.
>> The "slowing" operations are not the same in different executions, and theydo not
have a specific type (not only DB query, not only DB stored procedures, not only.....).
>> It seems like if the thread is frozen for a fixed amount fo time (4 seconds more
or less) and then it restarts.
>> I don't think it's a "queue" problem because otherwise the wait time would be unperdictable
and not a "fixed" 4 seconds time.
>> I don't know any parameter impacting on that behaviour.
>> I use Tomcat 7.0.32 with JVM on a Linux server.
>> Could someone suggest a solution for my problem or, at least, an investigation strategy.
> Performance and Memory Java Profiler - YourKit Java Profiler<>
> Easy to use performance and memory profiler for .NET framework. Supports ASP.NET, Silverlight,
.NET Windows services and more.
> Mark
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