> -Original Message-
> From: Olaf Kock
> Sent: Friday, June 25, 2021 8:07 AM
> To: users@tomcat.apache.org
> Subject: Re: Re-Use TCP Source Ports if the Socket is Unique?
>
>
> On 25.06.21 14:46, Eric Robinson wrote:
> > Olaf and Scott --
> >
> &g
> -Original Message-
> From: Christopher Schultz
> Sent: Friday, June 25, 2021 11:33 AM
> To: users@tomcat.apache.org
> Subject: Re: Re-Use TCP Source Ports if the Socket is Unique?
>
> Eric,
>
> On 6/24/21 21:14, Eric Robinson wrote:
> > I guess I ma
> -Original Message-
> From: Mark H. Wood
> Sent: Friday, June 25, 2021 12:30 PM
> To: users@tomcat.apache.org
> Subject: Re: Re-Use TCP Source Ports if the Socket is Unique?
>
> On Fri, Jun 25, 2021 at 12:46:03PM +, Eric Robinson wrote:
> > Olaf and Scott -
We can run 75 to 125 instances of tomcat on a single Linux server with 12 cores
and 128GB RAM. It works great. CPU is around 25%, our JVMs are not throwing
OOMEs, iowait is minimal, and network traffic is about 30Mbps. We're happy with
the results.
Now we're upping the ante. We have a 48-core s
> -Original Message-
> From: Shawn Heisey
> Sent: Saturday, June 26, 2021 8:09 PM
> To: users@tomcat.apache.org
> Subject: Re: 500 instances of tomcat on the same server
>
> On 6/25/2021 8:58 PM, Eric Robinson wrote:
> > We can run 75 to 125 instances of tomc
> -Original Message-
> From: Christopher Schultz
> Sent: Monday, June 28, 2021 8:54 AM
> To: users@tomcat.apache.org
> Subject: Re: 500 instances of tomcat on the same server
>
> Eric,
>
> On 6/25/21 22:58, Eric Robinson wrote:
> > We can run 75 to 12
> -Original Message-
> From: Mark Thomas
> Sent: Monday, June 28, 2021 9:04 AM
> To: users@tomcat.apache.org
> Subject: Re: 500 instances of tomcat on the same server
>
> On 28/06/2021 14:53, Christopher Schultz wrote:
> > Eric,
> >
> > On 6/25
t be simple to be able to scale it to different clients like that.
> just my 2 cents.
>
Not simple, but predictable. We've been hosting it for over decade, and we have
a good feel for its resource utilization.
-Eric
> On Mon, Jun 28, 2021 at 1:12 PM Eric Robinson
> wrote:
>
Guido,
I think you intended that message for me, not Brian. Thanks much for the
feedback. I have been reading about Kubernetes, but I got discouraged when I
saw that they dropped Docker support, since Docker seems to be the most popular
containeriziation technology. Also, most of the Kubernetes
> -Original Message-
> From: Berneburg, Cris J. - US
> Sent: Tuesday, June 29, 2021 7:16 AM
> To: users@tomcat.apache.org
> Subject: RE: 500 instances of tomcat on the same server
>
> Eric and Mark
>
> Just curious...
>
> Eric> We can run 75 to 125 instances of tomcat on a single Linux ser
When we see these errors in the tomcat logs...
java.lang.OutOfMemoryError: Java heap space
... we do a thread dump and examine the memory numbers, resulting in output
such as the following...
PSYoungGen total 95808K, used 22323K [0x2aaac377,
0x2aaaca21, 0x2aaaca2100
> PSYoungGen total 95808K, used 22323K [0x2aaac377,
> 0x2aaaca21, 0x2aaaca21)
> eden space 82432K, 10% used
> [0x2aaac377,0x2aaac402f7f8,0x2aaac87f)
> from space 13376K, 99% used
> [0x2aaac87f,0x2aaac94fd5a8,0x2aaac950)
>
Christopher Shultz wrote:
//
Time to upgrade. Tomcat is hideously out of date (probably because you are
using RedHat's Tomcat package), at least by version number. I'm not sure what
RedHat does (if anything) about security fixes, etc. but a vanilla 6.0.18 is
probably vulnerable and has been for
//
Yeah, heapdumps.
I've posted above some howtos, have you looked at them?
//
No, I'm not sure how useful I would find them. I think the heap summary is
probably all I need, but I may be wrong. Would the heap dump provide more
actionable intel as far as tuning my memory parameters?
--Eric
//
Recent 64-bit JVMs will automatically use "-XX:+UseCompressedOops".
I'm not sure about your version, specifically. If you have the option, you
might want to run a 32-bit JVM; it will probably run leaner and faster than a
64-bit JVM will.
//
Interesting. What do you mean my faster and leaner?
//
You can look for biggest objects in heap (using MAT, Leak Suspects report,
Dominators Tree report).
This way you can try to find what was the exact reason of OOM instead of just
thinking "eh, I need to give instances more memory".
MAT does things good. I've already found using MAT+JVVM the rea
//
Mostly leaner - a 32-bit JVM uses 32-bit pointers, so object references consume
less heap and stack space. Whether or not the code runs faster or slower
depends on what you're doing, since the tradeoff is fewer registers available
in 32-bit mode, which can lead to more register spills and re
//
I think if you have vendor-locked app in vendor-locked environment (am I
right?)
//
Yes indeed.
//
As I said above, there is an options for JVM:
-XX:-HeapDumpOnOutOfMemoryError - it will make heapdump on OOM.
-XX:HeapDumpPath=./java_pid.hprof - give it an reasonable path to file.
Set this o
//
One correction, option -XX:-HeapDumpOnOutOfMemoryError disables heapdumps on
OOM, you should use -XX:+HeapDumpOnOutOfMemoryError - with plus sign, to enable
it.
//
Thanks for the follow-up.
--Eric
Our canned tomcat application's web.xml file contains the following filter...
SessionFilter
servlet.BlahSession
SessionFilter
/*
Is there a way to make this filter not apply to requests that originate from
certain IP addresses?
--
Eric Robinson
We have multiple JVMs deployed on two identical Linux servers. Each server has
60 JVMs. Until today, both servers were running Tomcat6 with JDK 1.6. Today we
upgraded one of the servers to Tomcat 8 with JDK 1.8. Now the JVMs on the
Tomcat 8 server are each using between 20-80% more memory than t
> On 22.12.2017 13:48, Eric Robinson wrote:
> > We have multiple JVMs deployed on two identical Linux servers. Each server
> has 60 JVMs. Until today, both servers were running Tomcat6 with JDK 1.6.
> Today we upgraded one of the servers to Tomcat 8 with JDK 1.8. Now the JVMs
&g
> > From: Eric Robinson [mailto:eric.robin...@psmnv.com]
> > Subject: RE: Is it Normal for Tomcat 8 to Use 20-80% More Memory Than
> Tomcat 6?
>
> > if JVM instance "A" is configured as follows on server 1 under tomcat6/jdk
> 1.6, then
> > instance &qu
>
> More heap or more native memory?
>
With the exact same Xms and Xmx settings, I get vastly different resident and
virtual image sizes from the Linux ps command.
tomcatA: jdk1.8.0_152, res: 694312, virt: 5045084
tomcatB: jdk1.6.0_21, res: 332840, virt: 3922656
--Eric
-
> Eric,
>
> Just curious how much ram do you have in the server and cpu resources.
>
> #free -m and # cat /proc/cpuinfo | egrep 'cores|processor'
>
> (Not to insult your intelligence , I am just specifying what I was curious to
> see)
>
> And it's always easier to copy/paste than to think.
>
> > More heap or more native memory?
> >
>
> With the exact same Xms and Xmx settings, I get vastly different resident and
> virtual image sizes from the Linux ps command.
>
>
> tomcatA: jdk1.8.0_152, res: 694312, virt: 5045084
> tomcatB: jdk1.6.0_21, res: 332840, virt: 3922656
We have users in AD domain “Billing” who need to run a tomcat application from
a server that is in domain “BackOffice.”
Is it possible for a user in the Billing domain to login to the tomcat
application in the BackOffice domain without having to re-authenticate?
--Eric
We have a farm of VMs, each running multiple instances of tomcat (up to 80
instances per server). Everything has been running fine for years, but recently
one server has started nailing the CPU to 100% utilization.
We have tried:
* Different versions of tomcat and JDK
* Doubling the re
o: Tomcat Users List
Subject: Re: Tomcat Server Using 100% CPU
Did you reviewed the localhost_access log file. Which web-application is using
tomcat the most ?
On Thu, Aug 8, 2019 at 9:53 AM Eric Robinson
wrote:
> We have a farm of VMs, each running multiple instances of tomcat (up
> to 80
0% CPU
On 08.08.2019 20:08, Eric Robinson wrote:
> Utkarsh and John, thank you for your feedback.
>
> Since everything was originally on Windows, and we built a new Linux server
> with fresh tomcat installs, and the only thing we moved over from the old
> Windows servers was the tomcat
the working and nonworking servers run the same webapps with the same workload?
On Thu, Aug 8, 2019 at 2:09 PM Eric Robinson
wrote:
> Utkarsh and John, thank you for your feedback.
>
> Since everything was originally on Windows, and we built a new Linux
> server with fresh tomcat installs,
es the CPU usage
> persist? Is it only at startup or does it randomly start after some uptime?
> Have your webapps or dependencies changed around the time the issue
> started? Do the working and nonworking servers run the same webapps
> with the same workload?
>
> On Thu, Aug 8, 201
EN
8027/java
-Original Message-
From: André Warnier (tomcat)
Sent: Thursday, August 8, 2019 3:53 PM
To: users@tomcat.apache.org
Subject: Re: Tomcat Server Using 100% CPU
On 08.08.2019 20:08, Eric Robinson wrote:
> Utkarsh and John, thank you for your feedback.
>
> Since ever
The third one. ☹
Oh well, I had to ask.
-Eric
-Original Message-
From: Mark Thomas
Sent: Tuesday, April 22, 2025 2:50 AM
To: users@tomcat.apache.org
Subject: Re: State Synchronization without Serialization - Possible?
On 22/04/2025 01:09, Eric Robinson wrote:
> Hi all,
>
> W
Hi all,
We want to implement tomcat clustering, but we cannot because the application
is commercial, and it does not support serializable objects. In short, it does
not work with tomcat's standard clustering technology. Is there any known
reliable way to share session state, cookies, etc., betw
101 - 135 of 135 matches
Mail list logo
