RE: Diagnosing Silently Frozen Tomcats

2013-03-22 Thread Robinson, Eric
> > ... and a link to TFM, if Eric didn't see [the other] Mark's response: > http://wiki.apache.org/tomcat/HowTo#How_do_I_obtain_a_thread_d > ump_of_my_running_webapp_.3F > > - -chris I did see that and I even read it before posting. It said kill -3 sends a SIGQUIT. I guess I jumped to the co

RE: Diagnosing Silently Frozen Tomcats

2013-03-22 Thread Robinson, Eric
> RTFM > > kill -3 doesn't kill the process it generates a thread dump to stdout. > > Mark Ha! It's probably been 30 years since the last time anyone told me to RTFM. Fair enough, I suppose I deserved it, although in my defense I did check the man page first. :-) Thanks! --Eric Disclai

RE: Diagnosing Silently Frozen Tomcats

2013-03-22 Thread Robinson, Eric
Dan said: > Take a full thread dump of the PID. Linux kill -3, if > Windows CTRL+BREAK if you have a console window open. > Mark said: > 2. Thread dumps > So I tried kill -3 but it does nothing. The process ignores me like it owes me child support. I notice that it is in sleep state S1 if

Diagnosing Silently Frozen Tomcats

2013-03-22 Thread Robinson, Eric
When tomcat freezes silently, what is the best way to look inside the frozen tomcat or java instance and see the cause? We have 1500+ tomcat instances, and most of them run great most of the time. But a few times per week, an instance will become unresponsive. There is usually nothing suspicious

RE: Free Memory vs. Total Memory vs. Max Memory

2012-02-22 Thread Robinson, Eric
> You have to balance that against the minimal cost of today's > memory (even ECC RAM is under $10 per GiB). > True, RAM is relatively cheap, but servers are not. We like to stack as many instances of tomcat on a server as possible while maintaining good performance. Some of our 8-core 32GB serv

RE: Free Memory vs. Total Memory vs. Max Memory

2012-02-20 Thread Robinson, Eric
> > What are the possible downsides of setting a low initial > memory pool > > and a high max pool? If a tomcat app usually needs > approximately 64MB > > of heap space, but sometimes as much as 300-400MB, would it > cause any > > problems to set the initial pool to 16M and the max pool to 51

RE: Free Memory vs. Total Memory vs. Max Memory

2012-02-18 Thread Robinson, Eric
> Robinson, Eric wrote: > >> We have many servers that have been running 100-200 instances of > >> tomcat each for years without any performance problems. > >> Most of our servers are Linux 8-core machines with 32GB > RAM, with the > >> tomcat instances

RE: Free Memory vs. Total Memory vs. Max Memory

2012-02-17 Thread Robinson, Eric
> We have many servers that have been running 100-200 instances > of tomcat each for years without any performance problems. > Most of our servers are Linux 8-core machines with 32GB RAM, > with the tomcat instances configured with -Xms16M -Xmx192M. > We also have some Windows servers with 100-

RE: Free Memory vs. Total Memory vs. Max Memory

2012-02-17 Thread Robinson, Eric
> >> I can see the lure of "only taking what you need" and allowing the > >> JVM to automatically re-size the memory space: > >> that way, you only take up a huge chunk of memory during peak load > >> and not all the time. > >> > >> But why? > >> > >> If you are going to need, say, 512MiB at peak

RE: Free Memory vs. Total Memory vs. Max Memory

2012-02-17 Thread Robinson, Eric
> Note that you are talking of "memory pool", which is a bit > vague. The -Xms and -Xmx parameters relate to how big the > Heap is, which is only one part of the memory space needed by the JVM. > I am just using the terms that I see on the screen when I pull up tomcat6w.exe. --Eric Discl

RE: Free Memory vs. Total Memory vs. Max Memory

2012-02-17 Thread Robinson, Eric
> > If your application > needs 64MB of > > Heap space and you allocate only -Xms16M, then right at the > start the > > JVM will have to increase the Heap to 64MB (minimum); so > why would you > > do that ? > 64MB was just a number I threw out. The app actually uses about 20MB at startup, s

Free Memory vs. Total Memory vs. Max Memory

2012-02-16 Thread Robinson, Eric
What are the possible downsides of setting a low initial memory pool and a high max pool? If a tomcat app usually needs approximately 64MB of heap space, but sometimes as much as 300-400MB, would it cause any problems to set the initial pool to 16M and the max pool to 512M? -- Eric Disclai

Do I Have Java Memory Fragmentation?

2011-12-19 Thread Robinson, Eric
We have a Windows 2003 R2 x64 virtual machine running as a guest under Oracle VirtualBox on 64-bit Linux. The Windows VM has 16GB of RAM and is running approximately 80 separate instances of tomcat. (These instances do a specific small function and do not require much power or cause much load.) Wit

RE: Tomcat Silently Dies and then Won't Restart -- Error 1067

2011-12-09 Thread Robinson, Eric
> > Tomcat 6 on our Windows 2003 R2 x64 server runs fine for a > day or two, > > then silently dies without leaving any messages in the log > files. Then > > when we try to restart it, we get a Windows error 1067 and > the service > > will not start. We have to reboot the whole server and the

Tomcat Silently Dies and then Won't Restart -- Error 1067

2011-12-09 Thread Robinson, Eric
Tomcat 6 on our Windows 2003 R2 x64 server runs fine for a day or two, then silently dies without leaving any messages in the log files. Then when we try to restart it, we get a Windows error 1067 and the service will not start. We have to reboot the whole server and then tomcat will work fine agai

RE: tomcat6 still deleting XML files from Catalina/localhost when the system is booted

2011-03-28 Thread Robinson, Eric
> So are nfs mounts being used? If so, my guess is that the > mount isn't available when Tomcat starts which triggers the undeploy. > > Mark > Sadly, this turns out not to be the case. We modified the tomcat init script so that it waits for the NFS mount to be available before trying to start t

RE: tomcat6 still deleting XML files from Catalina/localhost when the system is booted

2011-03-23 Thread Robinson, Eric
> >> suppose that what you want to mount there, is the exported NFS > >> filesystem "server01:/some/exported/fs". If you place a > small file > >> "not.yet.mounted" inside of the /mnt/nfs01 local > directory, it will > >> be visible, as long as the mount has not yet really happened. > > > >

RE: tomcat6 still deleting XML files from Catalina/localhost when the system is booted

2011-03-22 Thread Robinson, Eric
> Eric Robinson > > #!/bin/bash > > # > > # httpdStartup script for the Apache HTTP Server > > # > > # chkconfig: - 85 15 > > # description: Apache is a World Wide Web server. It is > used to serve > > \ > > # HTML files and CGI. > > # processname: httpd > > # config: /etc/h

RE: tomcat6 still deleting XML files from Catalina/localhost when the system is booted

2011-03-22 Thread Robinson, Eric
-- Eric Robinson > #!/bin/bash > # > # httpdStartup script for the Apache HTTP Server > # > # chkconfig: - 85 15 > # description: Apache is a World Wide Web server. It is used > to serve \ > # HTML files and CGI. > # processname: httpd > # config: /etc/httpd/conf/httpd.conf

RE: tomcat6 still deleting XML files from Catalina/localhost when the system is booted

2011-03-22 Thread Robinson, Eric
> -- > > On 22/03/2011 17:04, Robinson, Eric wrote: > > >> >debug="1" reloadable="false"> > > > > > > > So are nfs mounts being used? If so, my guess is that the > mount isn't > > available wh

RE: tomcat6 still deleting XML files from Catalina/localhost when the system is booted

2011-03-22 Thread Robinson, Eric
> On 22/03/2011 17:04, Robinson, Eric wrote: > > > debug="1" reloadable="false"> > > > > So are nfs mounts being used? If so, my guess is that the > mount isn't available when Tomcat starts which triggers the und

tomcat6 still deleting XML files from Catalina/localhost when the system is booted

2011-03-22 Thread Robinson, Eric
This is really getting frustrating. We have 75 instances on tomcat6 running on the same server. Each instance runs from its own discrete directory, where the tomcat-env.sh script and catalina.properties file set environment vars to point to that unique instance's folders. Every time we reboot the s

RE: Installing Tomcat the Brute Force Way?

2011-03-20 Thread Robinson, Eric
> > Not necessarily. I did an rpm -qlp on > tomcat-6.0.18-0.noarch.rpm. All > > the files it installs are in /opt/tomcat > > > > The files, yes. But it is highly likely that it installs > also links from /etc/tomcat, /usr/share/tomcat, > /usr/lib/tomcat, /var/lib/tomcat and so on. > At least

RE: Installing Tomcat the Brute Force Way?

2011-03-19 Thread Robinson, Eric
> > From looking at the server, it would appear that tomcat was > installed > > using tomcat-6.0.18-0.noarch.rpm. > > Now you're in trouble. The 3rd-party repackaged versions of > Tomcat typically scatter files all over, and then try to get > things back together with symlinks. You're better

RE: Installing Tomcat the Brute Force Way?

2011-03-18 Thread Robinson, Eric
> > I should be able to copy /opt/tomcat and /usr/java to the > new server, > > create the tomcat user, set permissions, and be on my way. No? > > Don't know about /usr/java, since that usually involves > symlinks; you should probably do an actual JRE or JDK install > for that. /opt/tomcat s

RE: Installing Tomcat the Brute Force Way?

2011-03-18 Thread Robinson, Eric
> > From: Robinson, Eric [mailto:eric.robin...@psmnv.com] > > Subject: Installing Tomcat the Brute Force Way? > > > If I have a working tomcat6 server, can I "install" tomcat6 > on a new > > server by simply copying a few files and directories over fro

Installing Tomcat the Brute Force Way?

2011-03-18 Thread Robinson, Eric
Hey, here's a quick question (and possibly a stupid one, but I have a thick skin). If I have a working tomcat6 server, can I "install" tomcat6 on a new server by simply copying a few files and directories over from the working server to the new one and setting permissions? --Eric

RE: why does tomcat6 delete xml files from ../tomcat6/conf/Catalina/localhost directory?

2011-03-10 Thread Robinson, Eric
> > The only filesystem involved is the local ext3 one that > tomcat lives on. > > I can stop and start tomcat as many times as I want and > everything is > > fine. But when I reboot the server, the next time tomcat > comes up the > > XML files get deleted. This only happens to the 70 or so >

RE: [>Suspected Spam<][Characteristics] Re: why does tomcat6 delete xml files from ../tomcat6/conf/Catalina/localhost directory?

2011-03-10 Thread Robinson, Eric
> > On 10/03/2011 14:33, Robinson, Eric wrote: > > The only filesystem involved is the local ext3 one that > tomcat lives on. > > I can stop and start tomcat as many times as I want and > everything is > > fine. But when I reboot the server, the next time tomcat

RE: why does tomcat6 delete xml files from ../tomcat6/conf/Catalina/localhost directory?

2011-03-10 Thread Robinson, Eric
> >> They are deleted as part of the autoDeploy process when Tomcat > >> detects that the associated directory or WAR file is deleted. Turn > >> off autoDeploy or stop deleting your WARs/directories. > > > > Why would rebooting cause this? I'm not aware of anything > that we are > > deleting.

RE: why does tomcat6 delete xml files from ../tomcat6/conf/Catalina/localhost directory?

2011-03-09 Thread Robinson, Eric
> -Original Message- > From: Mark Thomas [mailto:ma...@apache.org] > Sent: Wednesday, March 09, 2011 3:42 PM > To: Tomcat Users List > Subject: Re: why does tomcat6 delete xml files from > ../tomcat6/conf/Catalina/localhost directory? > > On 09/03/2011 23:

why does tomcat6 delete xml files from ../tomcat6/conf/Catalina/localhost directory?

2011-03-09 Thread Robinson, Eric
We have several instances of tomcat running on a server and everything seems to run fine. We can stop and start all instances of tomcat independently. HOWEVER, when we reboot there server, we find that several XML files have been deleted from the conf directories for each instance. These files ar

RE: Monitor session count & request time.

2011-02-11 Thread Robinson, Eric
Disregard that last email. If I had paid attention, I would not have skipped right past the part where it was about Solr. :-| -- Eric Robinson Disclaimer - February 11, 2011 This email and any files transmitted with it are confidential and intended solely for Tomcat Users List. If yo

RE: Monitor session count & request time.

2011-02-11 Thread Robinson, Eric
> -Original Message- > From: Stijn Vanhoorelbeke [mailto:stijn.vanhoorelb...@gmail.com] > > Hi, > > I'm using Solr on my Tomcat 6 system. How can I measure how > much sessions there are active? > > I could find such info through Tomcat manager > (manager/html/sessions?path=/solr). But

RE: Is IBM Right About Java?

2011-02-10 Thread Robinson, Eric
Chris, > On 2/9/2011 3:01 PM, Edward Bicker wrote: > > I agree, I have enjoying Charles remarks and comments as well. > > I say to PID, he needs to PIDDLE off and leave us alone. > > /Ed > > Mod down: troll. :( > > Pid was right: you did hijack the thread. > He wasn't mean or obnoxious. > He eve

RE: Is IBM Right About Java?

2011-02-09 Thread Robinson, Eric
> > The JVM always reserves the maximum heap size as virtual space, but > > does not allocate more of the heap than the current limit; > the limit > > will be adjusted up or down within the -Xms : -Xmx range as load > > dictates. The unused virtual space is not available for > any other use.

RE: Is IBM Right About Java?

2011-02-08 Thread Robinson, Eric
Andre, > Like, what if they come back next week and say that now they > need 1 GB heap per instance ? > Sometimes I lose sleep thinking about that scenario. :-) --Eric Disclaimer - February 8, 2011 This email and any files transmitted with it are confidential and intended solely for

RE: Is IBM Right About Java?

2011-02-08 Thread Robinson, Eric
> Daniel, > > On 2/8/2011 4:56 PM, Daniel Savard wrote: > > However, increasing this limit for all instances may lead to a > > situation where enough instances are claiming more memory > at the same > > time and beyond the physical memory available. > > Exactly. With the low-memory limit on ea

RE: Is IBM Right About Java?

2011-02-08 Thread Robinson, Eric
Chris, > On 2/8/2011 3:16 PM, Robinson, Eric wrote: > > This is great feedback, Chuck. Right now we have 200+ instances > > running on the same server, most of which are set to 64MB > min and max > > heap. Like I daid, we do not see OOM messages or paging, > and t

RE: Is IBM Right About Java?

2011-02-08 Thread Robinson, Eric
> pid's using a mail client that uses header information to > track threads. > So, if you started this thread by hitting "reply" to an > existing topic then changed the subject and content, the > header thread tracking info will still be present. Thus, to > him, it will appear as though you

RE: Is IBM Right About Java?

2011-02-08 Thread Robinson, Eric
> > As I understand it, it would actually not work because > instances that > > peak at 512M but then go back down to, say, 128M, would still never > > return the unused memory to the OS so it can be used by > other instances. > > Not true - that's the whole point of the -Xms setting. If GC

RE: Is IBM Right About Java?

2011-02-08 Thread Robinson, Eric
> > Saw this statement on an IBM web site: > > Please don't hijack threads. > > Start a new email to the list, just like you would to a person. > > I'm not sure what you are referring to. I started this as a new thread and so far it has not wandered off topic at all. I'm especially appreciati

RE: Is IBM Right About Java?

2011-02-08 Thread Robinson, Eric
> On 2/8/2011 12:27 PM, Robinson, Eric wrote: > >>> I would like to set all JVMs to -Xms=32M -Xmx=512M and let > >> the system > >>> figure out how much memory each instance really needs. > >> > >> That should work, at the expense of some thr

RE: Is IBM Right About Java?

2011-02-08 Thread Robinson, Eric
> > I would like to set all JVMs to -Xms=32M -Xmx=512M and let > the system > > figure out how much memory each instance really needs. > > That should work, at the expense of some thrashing of the > heap size as the load waxes and wanes. > As I understand it, it would actually not work becaus

RE: Is IBM Right About Java?

2011-02-08 Thread Robinson, Eric
Thanks for the input, everyone. I see there is mostly agreement on this question. Once the OS allocates memory to the JVM, the OS never gets it back. GC does not return memory to the OS. This is unfortunate behavior for those of us who stack multiple instances on tomcat/java on the same server as

Is IBM Right About Java?

2011-02-08 Thread Robinson, Eric
Saw this statement on an IBM web site: "Most JVMs grow towards the upper heap limit (-Xmx/-mx options) when more memory is required, and do not return memory to the operating system, even if the memory is no longer needed, until the JVM process terminates." Is this true? If thought returning unne

RE: Tomcat Shutting Down by Itself?

2010-07-28 Thread Robinson, Eric
> So we definitely know the process is gone and not that > it is only no longer responding? I'm not 100% certain. I did... netstat -an|grep ":3057"|grep LISTEN ..and nothing came back. From that we at least know that the process was no longer listening on its assigned port. Then I *t

RE: Tomcat Shutting Down by Itself?

2010-07-27 Thread Robinson, Eric
>> 2) Use System.getRuntime().addShutdownHook() to trigger your >> own thread when the JVM does decide to exit. > > Assuming the OP does not have easy access to the running > application, would that mean adding another application > which is launched at Tomcat start, and runs the above ? > Or d

RE: Tomcat Shutting Down by Itself?

2010-07-27 Thread Robinson, Eric
> this particular set of users of this complex application, uses > a particular functionality of the application, used by no other > set of users, and that particular functionality contains > (or triggers) a bug that blows away the server. That seems like the reasonable conclusion. The next qu

RE: Tomcat Shutting Down by Itself?

2010-07-27 Thread Robinson, Eric
> Yes. Each instance serves a different set of users > in a local office somewhere. By that I mean each pair of load-balanced instances serves a set of users in a local office somewhere. -- Disclaimer - July 27, 2010 This email and any files transmitted with it are confidential and intended

RE: Tomcat Shutting Down by Itself?

2010-07-27 Thread Robinson, Eric
>> 364600 491072 java5101 <--Here's the occasional bad boy >> 604780 746120 java 31131 <--Here's the occasional bad boy. > Those sizes appear to be in Kbyte, so we are talking in one > case of a process with a resident size of 360 MB, in the other of > 600 MB.I guess thus

RE: Tomcat Shutting Down by Itself?

2010-07-27 Thread Robinson, Eric
> Intuitively, I would have never thought that it was > /possible/ to run 160 or so instances of Tomcat on > anything but some type of very expensive hardware. I assure you that it works admirably! And each of the instances runs a sophisticated medical application with hundreds of JSPs and class

RE: Tomcat Shutting Down by Itself?

2010-07-26 Thread Robinson, Eric
> What kind of machine are you running these 163/164 > instances of Tomcat on, and when you are running them, > what /does/ "free" say ? I have two different servers with 164 instances of tomcat. Both servers have 2x quad-core 2.8Ghz Xeon processors with 32GB RAM. On the first server (app03), mo

RE: Tomcat Shutting Down by Itself?

2010-07-26 Thread Robinson, Eric
> What I was trying to say above, in a devious but humoristic > way, is that there are not a lot of people on this list > running those versions anymore. Fair enough. I realize it's old, but it still works great for 163 of the 164 instances on this server. However, an upgrade is coming soon a

RE: Tomcat Shutting Down by Itself?

2010-07-23 Thread Robinson, Eric
> This Tomcat and Java are just trying to say, in the only > way they can, that after some 10 years of good and hard > labor, it is now time to retire them and have the burden > taken over by a new generation. Yes, that's probably it. One of the... [r...@app03 ~]# ps ax|grep java|wc -l 164

RE: Tomcat Shutting Down by Itself?

2010-07-23 Thread Robinson, Eric
> Maybe something from this recent discussion applies: > http://marc.info/?t=12767355721&r=1&w=2 Good thread, thanks. Unfortunately, the situations it describes don't apply in this case. -- Eric Robinson Disclaimer - July 23, 2010 This email and any files transmitted with it are confident

RE: Tomcat Shutting Down by Itself?

2010-07-23 Thread Robinson, Eric
> Tomcat 5.x.y what? Be specific. Also tell us the JVM > you're using and the platform you're running on. Apache Tomcat/5.0.28 Java 1.4.2_09-b05 Sun Microsystems Inc. Linux 2.6.18-92.1.22.el5PAE i386 > If one of your webapps is doing something antisocial such > as calling System.exit(), t

Tomcat Shutting Down by Itself?

2010-07-23 Thread Robinson, Eric
We've observed tomcat5 shutting down seemingly by itself recently. This morning I saw this in the log: - Scheduler DefaultQuartzScheduler_$_NON_CLUSTERED shutting down. Any way to tell why tomcat is shutting down? -- Eric Robinson Disclaimer - July 23, 2010 This email and any files transmit

RE: Multiple Tomcat Instances

2010-06-24 Thread Robinson, Eric
> whoever has a user login on the server can have their own Tomcat > playground even though there is just one Tomcat installed? Pretty much, yes. --Eric Disclaimer - June 24, 2010 This email and any files transmitted with it are confidential and intended solely for Tomcat Users List. If you

RE: Does GC Really Matter (In This Situation)?

2010-06-23 Thread Robinson, Eric
> You can monitor the gc with jstat. > jstat -gc 10s > This wil show you the memory usage of a java instance with the time spent in GC. > If it does 0.9 sec. of GC every sec. yare running inefficient. :-) Thanks. I guess I could restate the question as, "Does GC inefficiency really matter if ove

RE: placiing content and application on a microsoft DFS solution

2010-06-22 Thread Robinson, Eric
> Has anyone ever placed an application and its content on a redundant > DFS solution? > So as when one DFS server fails, another takes over. > Does anyone see possible problems with this setup? > ie. when dfs server fails does tomcat loose connection to the app or > is the failover fast enough

RE: Showing Tomcat Memory Utilization with 'top'

2010-06-22 Thread Robinson, Eric
> Also, I believe VIRT includes memory shared with other > processes, so if you have 50MiB of Java system classes > loaded and a modern JVM which shares them among running JVMs, > then you'll see that 50MiB included in every process's VIRT > that is sharing it, which is somewhat misleading. E

RE: Showing Tomcat Memory Utilization with 'top'

2010-06-22 Thread Robinson, Eric
>> 2. Where does the 64MB of java heap show up? > Buried inside the VIRT number. For example, I have a tomcat configured to use 96MB of heap (export JAVA_OPTS="-ms96M -mx96M"). Top shows VIRT=336396, RES=227264. I'm guessing that the 96MB of heap is buried in BOTH the VIRT and RES numbers? -- E

Showing Tomcat Memory Utilization with 'top'

2010-06-22 Thread Robinson, Eric
In top, my java processes all show an average VIRT size of about 250MB and an average RES size of about 150MB. Most of them were started with a 64MB heap size. I have two questions: 1. Top shows 0k of swap usage, so the system is not swapping. In that case, why is there a difference between the VI

RE: Does GC Really Matter (Is This Situation)?

2010-06-22 Thread Robinson, Eric
>> Some people say this approach will lead to increased CPU > utilization > If you're referring to what I said, note the numerous caveats I > included. Sorry, I wasn't referring specifically your comments. Over the years I've heard the same thing a few times from different sources. It seems t

Does GC Really Matter (Is This Situation)?

2010-06-22 Thread Robinson, Eric
This is a similar question to one already being discussed in the list with the subject "Setting the Right Amount of Memory". We have 160 instances of tomcat on the same server, with most instances configured to use 64-96MB of RAM. We carefully watch the logs for OOMEs. If we see any, we increase t

RE: Setting the Right Amount of Memory

2010-06-21 Thread Robinson, Eric
> Sorry for not responding yet. Busy at what I actually > get paid for, and trying to generate some real numbers > for the question at hand. More later. No worries, I just want to keep the thread alive until something definitive comes from it if possible. :-) -- Eric Robinson Disclaimer -

RE: Setting the Right Amount of Memory

2010-06-21 Thread Robinson, Eric
> So what is the impact say (picking some random > numbers of the air) if you have an app that is quite > happy with 256MB of heap space but has 1024MB allocated? My question exactly! -- Eric Robinson Disclaimer - June 21, 2010 This email and any files transmitted with it are confidenti

RE: Setting the Right Amount of Memory

2010-06-20 Thread Robinson, Eric
>> For what it's worth, either this is not the case in our >> real-world situation or the effect is negligible. > Not surprising - you'd have to be very unlucky to be right > at the edge and see a lot of GC activity and be able to > continue running. Usually you'll be over the edge a bit, > e

RE: Setting the Right Amount of Memory

2010-06-20 Thread Robinson, Eric
> Having a borderline heap size can, in the worst case, result > in almost continual GC activity, if there is only room to > allocate a minimal number of objects between GC occurrences. For what it's worth, either this is not the case in our real-world situation or the effect is negligible. Even

RE: Setting the Right Amount of Memory

2010-06-19 Thread Robinson, Eric
> Just a note here : 160 X 512 MB = 81 GB. If each Tomcat's > JVM Is allowed to use up to 512 MB of Heap, there might be > moments where a lot of JVM's will be using close to that > amount. Unless your system can really support that amount > of real RAM, you may be in for massive swapping. Th

RE: Setting the Right Amount of Memory

2010-06-19 Thread Robinson, Eric
On 17/06/2010 08:59, Robinson, Eric wrote: >> If your heap size is right on the edge of your minimum for a Tomcat >> instance, you may be doing more GC work than is really needed. >> However, if you're satisfied with the response time and CPU >> utilization, you sho

RE: Setting the Right Amount of Memory

2010-06-17 Thread Robinson, Eric
> Time to hit the vendor around the head with the cluebat. > If the app is happy with less heap space then increasing > it is only going to cause problems - mainly that GC when it > happens will take longer and trigger longer pauses. You can > mitigate this with GC config (later VMs may make th

RE: Setting the Right Amount of Memory

2010-06-17 Thread Robinson, Eric
> Just wondering, what tools do you use to manage all the > instances? Also, what do you use to look for the OutOfMemory > in logs? I am looking at Splunk too. Just shell scripts. We have scripts that... -- set up a new instance and customize it for a new customer -- stops, sta

RE: Setting the Right Amount of Memory

2010-06-17 Thread Robinson, Eric
> If your heap size is right on the edge of your minimum for a Tomcat > instance, you may be doing more GC work than is really needed. > However, if you're satisfied with the response time and > CPU utilization, you should be ok. My thoughts exactly. Just wanted to check it with the community.

Setting the Right Amount of Memory

2010-06-16 Thread Robinson, Eric
We run 150+ instances of tomcat on one server. To optimize memory utilization, each tomcat instance is configured with 64MB by default (export JAVA_OPTS="-ms64M -mx64M"). We then watch for Java.Lang.OutOfmemory errors in the logs. If we see any of these over time, we allocate additional RAM in 32

RE: I Have Multiple Tomcat Instances, Now I Want Each to Run In a Different Time Zone

2009-11-24 Thread Robinson, Eric
Never mind, got it. I was using JAVA_OPTS instead of CATALINA_OPTS. --Eric Disclaimer - November 24, 2009 This email and any files transmitted with it are confidential and intended solely for Tomcat Users List. If you are not the named addressee you should not disseminate, distribute, cop

I Have Multiple Tomcat Instances, Now I Want Each to Run In a Different Time Zone

2009-11-24 Thread Robinson, Eric
I want to run multiple instances of tomcat on the same server, one instance for each time zone. I have all the separate tomcats running fine, but they are all using the server's time zone. I've been Googling and have not found an effective way to do it. Can someone please tell me how? --Eric

RE: Response Time in Jasper Logs

2009-07-06 Thread Robinson, Eric
> I would add that one good place to /start/ looking, > is the DNS name resolution of your customer's workstations. > Because if that is not working properly, then your server > won't even see the request for a while after they click.. Thanks for the suggestion. The clients connect by IP address

RE: Response Time in Jasper Logs

2009-07-05 Thread Robinson, Eric
Chris, > Your question makes me think that perhaps what you're > seeing is a timing-out keep-alive request: It's not what I'm seeing in the logs, it's what the customer is seeing in the application. One of my customers says they are frequently seeing long application delays on all of the workst

RE: Response Time in Jasper Logs

2009-07-05 Thread Robinson, Eric
That's very helpful, Chris. > The bytes are not guaranteed to have arrived at the client by the time the valve computes the elapsed time. Right, but is it generally correct to say that the response time value represents the time from when the request was received to the time the response was tra

Response Time in Jasper Logs

2009-07-03 Thread Robinson, Eric
We added the %D parameter to the AccessLogValve tag in our server.xml file and now all entries in the jasper logs contain a field showing the response time in milliseconds. That's very cool. I just want to be sure of one thing. Does the value represent the total time from the moment tomcat saw the

Best Free or Inexpensive Tomcat Log Analyzer

2009-03-04 Thread Robinson, Eric
Does anyone have suggestions on the best free or inexpensive tomcat log analyzer? I'm specifically looking for a tool that can help me spot performance problems such as requests that take a long time, errors, timeouts, and so on. If the tool can centrally monitor multiple servers, all the better!

Effect of Heap Size on Performance?

2009-03-04 Thread Robinson, Eric
One of our application servers has a small heap size, 64MB. The status page seems to indicate that the heap usage is somewhere around 48MB, with 16MB free. Most people these days suggest setting the heap size much higher, at least 512MB. Is there a way to tell what the optimal heap size is for our

RE: Understanding Tomcat Memory Utilization

2008-12-15 Thread Robinson, Eric
> That's 64 MB for the *Java heap*, not the entire process. Thanks, that's what I didn't know. -- Eric Disclaimer - December 15, 2008 This email and any files transmitted with it are confidential and intended solely for Tomcat Users List. If you are not the named addressee you should not

RE: Understanding Tomcat Memory Utilization

2008-12-15 Thread Robinson, Eric
> Welcome to paging. I understand the difference between resident size and virtual image. What I don't understand is why the tomcat status page indicates that tomcat is configured to use a maximum of 64MB, but the resident size is twice that and the virual image is four times that. In other word

RE: Understanding Tomcat Memory Utilization

2008-12-15 Thread Robinson, Eric
> Welcome to paging. I understand the difference between virtual image size and resident size. The part I don't understand is the relationship between the tomcat memory configuration as reported by the tomcat status page and the actual usage as reported by top. Tomcat says it is configured to us

Understanding Tomcat Memory Utilization

2008-12-15 Thread Robinson, Eric
We have 60 instances of tomcat 5.X running on an RHEL4 server. Each instance runs a copy of basically the same application, each for a different customer. According to their respective status pages, the tomcats are all configured to use a maximum of 64MB memory, but most peak at around 48MB.

RE: Multiple Authentication Methods?

2008-05-13 Thread Robinson, Eric
I'm too lazy for all that. I was hoping it would amount a few extra lines in some configuration file. Now I'm thinking I'll figure out a way to lock it down in group policy or with some changes to the proxy server. -- Eric Robinson Disclaimer - May 13, 2008 This email and any files transmitte

Multiple Authentication Methods?

2008-05-13 Thread Robinson, Eric
How would be go about implementing the following kind of access scheme? 1. If the user's IP address is in an approved range, let them connect to tomcat anonymously. 2. If the IP address is not in an approved range, authenticate them through Active Directory. Is that even possible? -- Eric Ro

RE: Newbie Question: How to Disable Caching?

2007-05-08 Thread Robinson, Eric
ject: Re: Newbie Question: How to Disable Caching? Robinson, Eric wrote: > We have a medical program that runs on two tomcat servers behind an > LVS load balancer. Everything works fine except for one particular > function that apparently relies on data in the tomcat5/work directory. > I

Newbie Question: How to Disable Caching?

2007-05-08 Thread Robinson, Eric
We have a medical program that runs on two tomcat servers behind an LVS load balancer. Everything works fine except for one particular function that apparently relies on data in the tomcat5/work directory. If the load balancer directs a request to a tomcat server that has different cache data, the

RE: Someone Please: Why Is Tomcat Looking In The Wrong Directory?

2006-08-01 Thread Robinson, Eric
meone Please: Why Is Tomcat Looking In The Wrong Directory? Hmmm. and the plot thickens. Have you asked the vendor about this issue? Can they offer any insights as to how they access the myapp.properties file? --David Robinson, Eric wrote: >David, > >I do not know if the 3rd part

RE: Someone Please: Why Is Tomcat Looking In The Wrong Directory?

2006-08-01 Thread Robinson, Eric
Chris, It makes sense, but before I try the symlink approach, be advised of the full scenario. Multiple doctor's offices will be connected to the same server. Each office will have its own instance of tomcat running a copy (sometimes a different version) of the 3rd party app. The config files are

RE: Someone Please: Why Is Tomcat Looking In The Wrong Directory?

2006-08-01 Thread Robinson, Eric
eliant on a hard coded path or a relative path to the current directory at the time tomcat was started. --David Robinson, Eric wrote: >Sorry, I cannot answer that question as I am not the developer. >Although I called it "myapp" for simplicty, it is really a third-party >app

RE: Someone Please: Why Is Tomcat Looking In The Wrong Directory?

2006-08-01 Thread Robinson, Eric
email, neither PSM nor PMC can accept responsibility for any loss or damage arising from the use of this email or attachments.-Original Message- From: Steve Lianoglou [mailto:[EMAIL PROTECTED] Sent: Tuesday, August 01, 2006 8:08 AM To: Tomcat Users List Cc: Robinson, Eric Subject: Re: So

RE: Someone Please: Why Is Tomcat Looking In The Wrong Directory?

2006-08-01 Thread Robinson, Eric
.properties" ) ; --David Robinson, Eric wrote: >Hello all, > >When I start tomcat, I get several messages like these: > >java.io.FileNotFoundException: >/usr/local/tomcat5/webapps/myapp/conf/myapp.properties (No such file or >directory) > >This file actua

RE: Someone Please: Why Is Tomcat Looking In The Wrong Directory?

2006-08-01 Thread Robinson, Eric
8:06 AM To: Tomcat Users List Subject: Re: Someone Please: Why Is Tomcat Looking In The Wrong Directory? On 8/1/06, Robinson, Eric <[EMAIL PROTECTED]> wrote: > mobiledoc.xml exists in /usr/local/tomcat5/conf/Catalina/localhost > > mobiledoc.xml exists in > /home/myaccoun

Tomcat Config Problem: Will Pay for a Quick Answer!

2006-08-01 Thread Robinson, Eric
Please accept my apologies for being so direct, but we're in a huge hurry to get the answer to a tomcat configuration problem. I think it is a simple problem, but I have been unable to figure it out. (See my post earlier today entitled, "Someone Please: Why Is Tomcat Looking In The Wrong Directory?

RE: Someone Please: Why Is Tomcat Looking In The Wrong Directory?

2006-08-01 Thread Robinson, Eric
be subject to our monitoring procedures. 'Direct link to Fidelitys website. <http://www.fidelity-international.com/world/index.html> -Original Message- From: Robinson, Eric [mailto:[EMAIL PROTECTED] Sent: 01 August 2006 14:03 To: Tomcat Users List; Corobitsyn Roman Subject: R

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