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  • debugging JBoss 100% CPU usage

    - by Nate
    We are using JBoss to run two of our WARs. One is our web app, the other is our web service. The web app accesses a database on another machine and makes requests to the web service. The web service makes JMS requests to other machines, aggregates the data, and returns it. At our biggest client, about once a month the JBoss Java process takes 100% of all CPUs. The machine running JBoss has 8 CPUs. Our web app is still accessible during this time, however pages take about 3 minutes to load. Restarting JBoss restores everything to normal. The database machine and all the other machines are fine, only the machine running JBoss is affected. Memory usage is normal. Network utilization is normal. There are no suspect error messages in the JBoss logs. I have set up a test environment as close as possible to the client's production environment and I've done load testing with as much as 2x the number of concurrent users. I have not gotten my test environment to replicate the problem. Where do we go from here? How can we narrow down the problem? Currently the only plan we have is to wait until the problem occurs in production on its own, then do some debugging to determine the cause. So far people have just restarted JBoss when the problem occurred to minimize down time. Next time it happens they will get a developer to take a look. The question is, next time it happens, what can be done to determine the cause? We could setup a separate JBoss instance on the same box and install the web app separately from the web service. This way when the problem next occurs we will know which WAR has the problem (assuming it is our code). This doesn't narrow it down much though. Should I enable JMX remote? This way the next time the problem occurs I can connect with VisualVM and see which threads are taking the CPU and what the hell they are doing. However, is there a significant down side to enabling JMX remote in a production environment? Is there another way to see what threads are eating the CPU and to get a stacktrace to see what they are doing? Any other ideas? Thanks!

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  • Lightweight ad-blocker for firefox

    - by student
    On a old machine (512 MB RAM) I am currently running ubuntu jaunty and firefox 3.0.15. I tried the ad blocker addon add block plus but it eats lots of RAM (300 MB). Is high memory load of this add-on a bug, which is fixed in a newer version or just normal? If so, why is the memory usage so high? Is there another ad blocker add-on for firefox or another browser- add-on combination for linux (ubuntu jaunty) which uses significant less RAM?

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  • php mysql cpanel high cpu usage

    - by Megahostzone Santu
    server taking high cpu usage load average: 108.87, 105.92, 85.82 netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n Reselt showing too much connect from server IP cpanel Process Manager showing 19.4 | 0.5 | /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --log-error=/var/lib/mysql/zebra546.serverstall.com.err --pid-file=/var/lib/mysql/zebra546.serverstall.com.pid 3.0 | 0.2 | /usr/bin/php /home/nowwatch/public_html/index.php

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  • Trouble with Ubuntu on Oracle VM

    - by Rosarch
    I'm running Ubuntu on an Oracle VirtualBox virtual machine. I clicked the "install Ubuntu" button, and it took me through a wizard. I am currently on the following step: Unfortunately, the "forward" button is disabled. What's up with this? I tried entering different data for the form on this step, going back and redoing part of the wizard, and rebooting the machine. Nothing worked. My host OS is Windows 7.

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  • Exchange Not Delivering Email

    - by wolfvilleian
    I'm having an issue where my Exchange Edge Transport server receives mail (found in logs) and then it vanishes, never ending up in the users mailbox, I have a edge subscription setup between it and the main Exchange server, how can I go about tracing the message to figure out what is broken? I also have found records of the message in the logs on the main Exchange server. Thanks a ton for any help Edit: If I change port 25 on my main router to point to the main exchange server as opposed to the Edge Transport, email comes through fine form external domains and delivered in the correct mailbox

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  • Find out how many memory my server would need ideally?

    - by Daniel
    I have a pretty busy GNU/Linux server that I think needs more RAM. I know that the free command doesn't show the amount of RAM that is used. So I was stumbling upon Commited_As in /proc/meminfo. It currently shows 57972 kB which isn't much. Is this the amount of RAM that the processes use "right now" or is this an estimate of how many additional RAM it would take to never run out of memory with this load?

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  • Best program to conduct a presentation for investors

    - by the_drow
    Hello, I need a free program that follows those specific requirements: Can load Word/Powerpoint files and let the presenter control them Allows Voice/Video to be transmitted to all participants Is free (recommended but not required) or very cheap Is easy to install Anyone got recommendations for me?

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  • Url rewrite rule

    - by vvr
    How to redirect a page form show.php?id=(15charstring) to show/(15charstring) I tried like this it is doing reverse means it is redirecting /show/(15chars) to show.php?id=(15chars) RewriteEngine on RewriteRule ^/show/([a-zA-Z0-9]{15})$ http://site.com/show.php?id=$1 Second case is i have to redirect to another page if he added &m=true to the url show.php?id=(15chars)&m=true html/show.php?id=(15chars).

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  • A few question about some advanced Autohotkey uses

    - by user47625
    Hello, I'm using this wonderfull piece of software for some time now, but just for few quite basic things. So I'm wondering if these things would be possible: to use different set of shortcuts for different applications - so one shortcut performs different actions in different places. to make some form of modes for application, where you could use some swtch (vim style) and this would change things the shortucat would do if it would be possible to place some caption that indicates which mode you are using - little improvement of previous item I tkank everyone for answer.

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  • How can a cloud be created from virtualization or how is it different from virtualization?

    - by Echelon
    I have heard that virtualization is the basis of Cloud,so If i have a machine with xen as virtualizing environment and many vms running on it,then can that be called as a cloud. Is it true that vms that scale based on load and memory is called cloud and vms that do not scale is called as just virtualization! How can a vm scale??Based on my understanding for xen once we fix cpu and ram,it cant go beyond that (am aware of Dynamic memory Management) so how it really scale?.Can any one please clarify this

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  • What's the most compact way to store a password-protected RSA key?

    - by Tim
    I've tried converting a PEM-encoded key to DER format, and it appears the password is stripped regardless of the -passout argument. Example: openssl rsa -in tmp.pem -outform DER -out tmp.der -passin pass:foo -passout pass:bar -des3 The resulting key appears no longer password-protected, so I am assuming that DER format does not support a password - is that correct? What alternative way is there to store this in a compact, binary form, and keep the password-protection?

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  • What kind of hosting is used for *tube sites?

    - by playcat
    Hello, When a site grows from a just-a-fun project to a site with bigger load of visitor, and you want to enable them to upload videos, you might find yourself in a need of a better hosting, including dedicated server and a no-limit web traffic (or some reasonable limit). So, if people can upload their videos, and if page has around 1000-10000 visitors per day, what kind of hosting is there to choose from? What is needed in that case? Thx

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  • How to turn iptables stateless?

    - by tex
    Hi, I'm running a Linux server that - from time to time - faces heavy load and the conntrack table overflows. Since it's iptables firewall ruleset is very simple I'd like to turn it to stateless mode. I know that iptables can operate in stateful connection tracking mode and in a stateless mode. My firewall rules are all in place I'm pretty sure that they are stateless but my question is how can I verify that the firewall is really operating in stateless mode?

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  • A few questions about advanced Autohotkey uses

    - by user47625
    Hello, I have been using this wonderful piece of software for some time now, but for just a few basic things. So I'm wondering if the following would be possible: to use different set of shortcuts for different applications - so one shortcut performs different actions in different places. to make some form of modes for application, where you could use some switch (vim style) and this would change things the shortcat would do if it would be possible to place some caption that indicates which mode you are using - little improvement of previous item I thank everyone for their answers.

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  • How to fix windows 7 loader?

    - by Adio
    I have an HD 250 Gb It is portioned to C,D,E C has 50 GB D has 50 GB and the rest is given to E, On C I have Windows 7, I decided to install Opensuse On E. I have installed Opensuse Successfully. Now Opensuse loader shows Windows7 option when I it loads but, when I chose to load windows 7 I get " A Disk read error occured, press ctrl+alt+e to restart". Does any one has an Idea How to fix windows 7 and keep Opensuse ? My Opensuse is 12.2. Thanks

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  • IIS6 - Classic ASP - "out of memory"/"out of string space"

    - by glaucon
    We have a classic ASP application that's under significantly more load than usual. We are from time to time been getting "out of memory" and "out of string space" in the httperr. We do not usually see these errors. For the moment we cannot change the application. Is there anything we can do to the IIS config which will help to reduce or stop these errors occurring ? The application pool is set to default values currently.

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  • compare windows server for patch/update/hotfix installs

    - by user12002221
    Are there any tools that can be used to connect to windows 2008 servers, and get a comparison of the installed patches/updates on the servers, showing what is installed on one and not on the other? This is to help isolate an issue we are seeing on a specific windows server, in a load balanced setup. There is a certain performance/locking issue, which is mitigated whenever one of the servers is disabled. Please share, if you have any suggestions. Thanks in advance!

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  • Is the XP VMM a bottleneck on a multi core machine?

    - by JeffV
    I have a dual Xeon hex core machine running an IO intensive application. (WinXP 32) I am seeing a hardware driver (1/2 user mode, 1/2 kernel, streaming data) that is using 6k delta page faults per second. When other applications load or allocate large amounts of memory the driver's hardware buffer gets an underrun (application not feeding it fast enough). Could this be because the kernel is only using one core to service page fault interrupts?

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  • Is there a way to snapshot a running process to disk to restore it later?

    - by Sijin
    I usually work with a lot of instances of visual studio open to different projects, I was wondering if there is a way to snapshot/hibernate a running process to disk instead of closing it so that I can open it in the same state as it was quickly. I have a ton of free disk space so wouldn't mind saving the entire process snapshot if it would save me the time in opening up the solution and waiting for the projects to load.

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  • Rewrite rules for Drupal Boost with Lighttpd

    - by bsdjunkie
    I have been given the super task of preparing a web site to get hammered.... Or site is drupal based, I have found what could be my answer in the form of Boost. But I can't for the life of me find any information on the Lighttpd rewrite rules to make it function. All suggestion welcome! Thanks

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  • How to output a simple network activity plot in console in Linux?

    - by Vi.
    There's tload that plots load average. There's iftop that network usage as bars. How to do something like this: # tcpdump -i eth0 --plot 'host 1.2.3.4' 13:45:03 | | 0 in 0 out 13:45:04 |O | 0 in 1MB out 13:45:05 |OOOI | 500 KB in 4MB out 13:45:06 |OIIII | 6MB in 1MB out 13:45:07 | | 0 in 0 out 13:45:08 |IIIIIIIIIIII | 53M in 0 out

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