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. Mark > > Tks > > Tullio > > > ________________________________ > Da: Mark Thomas <ma...@apache.org> > 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 1.7.0.67 on a Linux server. >> Could someone suggest a solution for my problem or, at least, an >> investigation strategy. > > https://www.yourkit.com/java/profiler/features/ > Performance and Memory Java Profiler - YourKit Java > Profiler<https://www.yourkit.com/java/profiler/features/> > www.yourkit.com > Easy to use performance and memory profiler for .NET framework. Supports > ASP.NET, Silverlight, .NET Windows services and more. > > > > > Mark > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
