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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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  • Opening a specific port on Mac

    - by Manish
    I need to open a specific port on my mac client (because when I try to connect from server it says "target machine actively refused it ").My problem though is I cannot find a way to add a specific port on my latest Mac OS. I go to system pref-securtiy &privacy-firewall- turn it on (FWIW connection didnt work when I had turned it off)-Firewall options-"+" This gives me an option to add some application but not a port .Can someone point me to the right place to add the port?

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  • restore admin share C$

    - by woodelf
    My admin share C$ has been removed causing our server managed security - Sophos Endpoint Security and Control, to stop updating this client because it is unable to create local tasks. I've searched for two days now, lots of stuff about disabling C$ or allowing network access via a regedit - but nothing about restoring a missing "default admin share C$". OK I can recreate C$ from the mmc but it's removed on a reboot. System is Win7 Pro 64-bit on a domain Very grateful for any help... Nick

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  • How to send Ctrl+Alt+F1 to window (to switch terminal remotely, not locally)?

    - by Vi
    when I press Ctrl+Alt+F{1..12}, it switches me to other virtual terminal. When I have VNC/rdesktop client (and there it is VMWare/Virtualbox with other Linux) I want to switch virtual terminal remotely, but just pressing Ctrl+Alt+F1 switches things locally. VirtualBox/VMWare often provides special means to send Ctrl+Alt+Del, but not Ctrl+Alt+F1. (I already know that I can log in over ssh and chvt)

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  • RSS to e-mail notifications?

    - by OverTheRainbow
    There's a web site that's supposed to upload a video I'd like to watch but it could be in several weeks. The only way to be notified of any change is through RSS, but I don't use RSS at all, so installing an RSS client just for this seems overkill. Unless there's a better solution I should know about, do you know of a good, free solution on the web that will watch the RSS channel and send me an e-mail when a new item was added? Thank you.

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  • Best VPN Server

    - by eavar
    I don't like the standard vpn server on windows for some reason and I'm searching for the best client/server application in order to create a Virtual Private Network. I don't care if the application has it's own technology.

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  • `find` command not available in web host, how to implement a delete based on modification time using other commands?

    - by CalumJEadie
    I'm creating a simple datebase backup solution for a client using web hosting at DataFlame. The web hosting account provides access to cron but not a shell. I have a database backup script creating regular backups and I want to automatically remove those more than N days old. I attempted to use find -v $backup_dir -mtime +$keep_days -name "*db.tar.gz" -delete however the user executing the script does not have permission to run find. Can you suggest how to implement this without using the find command?

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  • I have install on my xpsp pc VMware® Workstation 7.1.1 build-282343

    - by Ajifan
    I have installed on my XP sp pc to VMware® Workstation 7.1.1 build-282343 And also I have more two separate machine one laptop and one pc I have already connect those three machine's to a Nortel switch to distribute internet as a work group Now I want add a virtual Windows server 2003 enterprise and I want to connect those my to machine as a client and want to give some policies and security for users Like real network environment t how I can implement those steps please explain me step by step

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  • What browser or any tool can reduce flash CPU usage?

    - by Stan
    OS: windows XP SP3 While listening to Pandora in Chrome, the CPU usage is almost to 100% for a single core in CPU. Is there any way to reduce CPU usage? Either by using another browser, any plugins that reduce flash CPU usage, or like in Linux, there's a lightweight client - Pithos for Pandora. Thanks.

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  • Not able to connect to port 80 using telnet?

    - by pranitkothari
    When I try to connect my Windows PC with telnet, its giving me following error. Welcome to Microsoft Telnet Client Escape Character is 'CTRL+]' Microsoft Telnet open 192.168.220.135 80 Connecting To 192.168.220.135...Could not open connection to the host, on port 8 0: Connect failed Microsoft Telnet I have firewall off for both the machines. Can you please suggest how to connect to port 80 using telnet. Thanks.

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  • Svn hook on commit makes lock

    - by dynback.com
    My post-commit hook looks like this: pushd C:\Websites\Project svn update I am updating my server copy of repository. When I commit client stopped on sending content and locked or I dont know. Its is waiting for something. So when I cancel and try to update manually on server, I see: Working copy "." lockedsvn And only after manual cleanup and update again, I get updated revision, that was really commited. What I do wrong?

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  • Is a VPN a good method for protecting data in an untrusted network? [closed]

    - by john
    I will be connecting my laptop in an untrusted network. If I setup OpenVpn on a server and use a vpn client on the laptop to connect through it, is it enough? Can someone perform a MITM attack or otherwise eavesdrop on my traffic? If someone on the local network port-scans my laptop, will the open ports be accessible to him while I use the VPN tunnel? Is there anything else I should keep in mind?

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