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List: tomcat-user
Subject: Re: users Digest 12 Apr 2016 18:54:12 -0000 Issue 12577
From: Lyndon Samson <lyndon.samson () gmail ! com>
Date: 2016-04-13 1:12:56
Message-ID: CAA7HE4bpo6PuAB91nbfW53+HLZ3-dN65K+r-RMX_Vjm32kYGQA () mail ! gmail ! com
[Download RAW message or body]
Windows env often have 'virus scanners' that make large numbers of HTTP
calls to known vunerable endpoints. Do the access logs show anything OOTO?
On 13 Apr 2016 4:54 am, <users-digest-help@tomcat.apache.org> wrote:
>
> users Digest 12 Apr 2016 18:54:12 -0000 Issue 12577
>
> Topics (messages 257263 through 257265)
>
> Re: Tomcat 8 uses high CPU
> 257263 by: Christopher Schultz
> 257264 by: Mark Thomas
> 257265 by: Josep M Beleta
>
> Administrivia:
>
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> ----------------------------------------------------------------------
>
>
>
> ---------- Forwarded message ----------
> From: Christopher Schultz <chris@christopherschultz.net>
> To: Tomcat Users List <users@tomcat.apache.org>
> Cc:
> Date: Tue, 12 Apr 2016 14:50:12 -0400
> Subject: Re: Tomcat 8 uses high CPU
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Josep,
>
> On 4/12/16 2:30 PM, Josep M Beleta wrote:
> > I need some help with a problem we have running Tomcat 8, with Java
> > 8 on a Windows 2008 R2 Standard with Service Pack 1 running as a
> > virtual machine on top of ESXi, 5.1.0. The virtual machine has 16
> > GB of memory and 4 CPUs. The physical host computer has lots of
> > memory and is not stressed at all.
> >
> > One week ago our Tomcats, we have two, began to use high CPU. When
> > the problem started we had no made any change we can remember in
> > the preceding week, and no Windows update was installed.
> >
> > We use two Tomcats, one of them with some in-house applications
> > the other one with Jira. Both began to shows the same symptoms
> > roughly at the same time.
> >
> > The Jira Tomcat version is 8.0.17 and runs with Java 1.8.0_51 64
> > Bit, the other Tomcat is 8.0.33 and runs over Java 1.8.0_77 64 Bit.
> >
> >
> > These are the facts we can summarize:
> >
> > 1. Now we run only the Tomcat for our in-house applications.We
> > stopped the Jira one. 2. We run it as a service. 3. Every time, two
> > hours after launching the Tomcat service, the CPU use jumps to
> > 70-75% and some time after (one hour more) it reaches 100 %. More
> > threads are allocated using lots of CPU. The final result is our
> > entire system being degraded as time goes on. 4. The problems has
> > nothing to do with our applications. We undeployed them with the
> > same result.
>
> So if you start Tomcat with no applications deployed and make no
> requests, Tomcat starts taking 75% of the CPU after 2 hours?
>
> Mark is right: we need to see those thread dumps. It looks like your
> second attempt also didn't work. Please try to re-attach them as plain
> text files.
>
> - -chris
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> Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
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> iEYEARECAAYFAlcNQ2QACgkQ9CaO5/Lv0PDJTwCfWuiSiAqrb8hYw5YQLOxE52uX
> isIAnRpR9Vj2GZLjiCMr6+hnFbB7eEPb
> =/3nu
> -----END PGP SIGNATURE-----
>
>
>
> ---------- Forwarded message ----------
> From: Mark Thomas <markt@apache.org>
> To: Tomcat Users List <users@tomcat.apache.org>
> Cc:
> Date: Tue, 12 Apr 2016 19:53:19 +0100
> Subject: Re: Tomcat 8 uses high CPU
> On 12/04/2016 19:50, Josep M Beleta wrote:
> > I am sorry, I sent the same file twice.
> >
> > Here is the other one.
>
> Nope. They need to be plain text attachments and no larger than 1MB.
>
> Mark
>
>
> >
> > **
> >
> > *Josep M Beleta*
> >
> > /Director de Tecnologia/
> >
> >
> > Carver Advanced Systems, S.L.
> >
> > ParĂs, 184. 4 º 08036 - Barcelona
> >
> >
> > Tel: 93 238 5880
> >
> > Fax: 93 238 5881
> >
> > */segueix-nos
> > <http://www.linkedin.com/company/carver-advanced-systems-s.l.>/*<
> http://twitter.com/#%21/carver_as> <
> https://plus.google.com/112583630853594851700?prsrc=3>
> >
> > www.carver-as.com <http://www.carver-as.com>
> >
> >
> > 2016-04-12 20:49 GMT+02:00 Josep M Beleta <beleta@carver-as.com
> > <mailto:beleta@carver-as.com>>:
> >
> > Hi Mark, thanks a lot.
> >
> > here come the dumps:
> >
> > Josep
> >
> >
> > **
> >
> > *Josep M Beleta*
> >
> > /Director de Tecnologia/
> >
> >
> > Carver Advanced Systems, S.L.
> >
> > ParĂs, 184. 4 º 08036 - Barcelona
> >
> >
> > Tel: 93 238 5880 <tel:93%20238%205880>
> >
> > Fax: 93 238 5881 <tel:93%20238%205881>
> >
> > */segueix-nos
> > <http://www.linkedin.com/company/carver-advanced-systems-s.l.>/*<
> http://twitter.com/#%21/carver_as> <
> https://plus.google.com/112583630853594851700?prsrc=3>
> >
> > www.carver-as.com <http://www.carver-as.com>
> >
> >
> > 2016-04-12 20:43 GMT+02:00 Mark Thomas <markt@apache.org
> > <mailto:markt@apache.org>>:
> >
> > On 12/04/2016 19:30, Josep M Beleta wrote:
> > > Hi,
> > >
> > > I need some help with a problem we have running Tomcat 8, with
> Java 8 on
> > > a Windows 2008 R2 Standard with Service Pack 1 running as a
> virtual
> > > machine on top of ESXi, 5.1.0. The virtual machine has 16 GB
> of memory
> > > and 4 CPUs. The physical host computer has lots of memory and
> is not
> > > stressed at all.
> > >
> > > One week ago our Tomcats, we have two, began to use high CPU.
> When the
> > > problem started we had no made any change we can remember in
> the
> > > preceding week, and no Windows update was installed.
> > >
> > > We use two Tomcats, one of them with some in-house
> applications the
> > > other one with Jira. Both began to shows the same symptoms
> roughly at
> > > the same time.
> > >
> > > The Jira Tomcat version is 8.0.17 and runs with Java 1.8.0_51
> 64 Bit,
> > > the other Tomcat is 8.0.33 and runs over Java 1.8.0_77 64 Bit.
> > >
> > > These are the facts we can summarize:
> > >
> > > 1. Now we run only the Tomcat for our in-house
> > applications.We stopped
> > > the Jira one.
> > > 2. We run it as a service.
> > > 3. Every time, two hours after launching the Tomcat service,
> > the CPU
> > > use jumps to 70-75% and some time after (one hour more) it
> reaches
> > > 100 %. More threads are allocated using lots of CPU. The
> final
> > > result is our entire system being degraded as time goes on.
> > > 4. The problems has nothing to do with our applications. We
> > undeployed
> > > them with the same result.
> > > 5. We tested versions 8.0.23 and 8.0.33 in our internal
> > Tomcat with the
> > > same results.
> > > 6. We tested JVM 1.8.0_66, 1.8.0_71 and 1.8.0_77 with the
> > same results.
> > > 7. We have changed some JVM parameters, allocating more heap
> > memory, or
> > > changing GC methods with always the same result, 100% CPU.
> > > 8. Using jstack we take several thread dumps that we are
> > enclosing in
> > > this message. Dump75 is whe the CPU was at 75 %, the other
> one,
> > > Dump100, the CPU was at 100%.
> > > 9. I am attaching the Process Explorer images of the Tomcat
> > process
> > > showing also the Tomcat threads. I am including a Tomcat
> manager
> > > screenshot showing the status of the server.
> > >
> > > Any help would be deeply appreciated,
> >
> > We really need to see those thread dumps. I've checked the list
> > config
> > and plain text files should be allowed through. I'm attaching a
> test
> > file to this message to confirm that. If it comes through, please
> > provide your thread dumps in plain text form and we can take a
> look.
> >
> > Mark
> >
> >
> >
> >
> ---------------------------------------------------------------------
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> > <mailto:users-unsubscribe@tomcat.apache.org>
> > For additional commands, e-mail: users-help@tomcat.apache.org
> > <mailto:users-help@tomcat.apache.org>
> >
> >
> >
> >
> >
> >
> > ---------------------------------------------------------------------
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> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
>
>
>
>
> ---------- Forwarded message ----------
> From: Josep M Beleta <beleta@carver-as.com>
> To: Tomcat Users List <users@tomcat.apache.org>
> Cc:
> Date: Tue, 12 Apr 2016 20:53:55 +0200
> Subject: Re: Tomcat 8 uses high CPU
> Again,
>
>
>
>
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