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From Tullio Bettinazzi <>
Subject Strange wait time in my application - Tomcat 7.0.67
Date Mon, 03 Oct 2016 07:56:34 GMT
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.


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