Then run the following to install Lasso 9 Server: Sudo add-apt-repository "deb natty main restricted multiverse" Important Note: Users installing Lasso Server on an Amazon EC2 Ubuntu instance may need to add the following additional repository: Sudo add-apt-repository "deb stable main" To install Lasso 9 on Ubuntu, run the following in your terminal (you may need to run `sudo apt-get install python-software-properties` if you don't have add-apt-repository installed): To install Lasso 9 on a 64-bit CentOS 6 system, as root run: To install Lasso 9 Server via yum, the LassoSoft yum repository must be configured on the server. If the file does not exist, create /etc//CentOS6-Lasso9.repo and enter the following: To install Lasso 9 on a 32-bit CentOS 5 system, as root run: Yum install Lasso-Instance-Manager.x86_64 To install Lasso 9 on a 64-bit CentOS 5 system, as root run: Note: as of 9.1.4, the recommended yum conf file has been changed to include the GPG key. To install Lasso 9 Server via yum, the LassoSoft yum repository must be configured on the server. If the file does not exist, create /etc//CentOS5-Lasso9.repo and enter the following: When done, open to complete the installation.ĬentOS 5 32-bit/64-bit installation with yum To install Lasso 9 Server from an rpm, ensure ImageMagick is installed, then download the appropriate file below and run:ģ2-bit: Lasso-Instance-Manager-9.1. (27.6MB)Ħ4-bit: Lasso-Instance-Manager-9.1.86_64.rpm (27.6MB)Ħ4-bit: Lasso-Instance-Manager-9.1.86_64.rpm (15.7MB) Instructions for updating ImageMagick on CentOS 5 are available. For late-breaking documentation updates, please consult the Errata directory. (or doing other things).Lasso 9 is a middleware product which relies on third-party web servers and databases for smooth operation. Then you can use this utility as a basis for implementing various policies for renicing executables. You can of course save the Perl code to a file, say onexecuting, prepend a first line #!/usr/bin/env perl, make the file executable, put it on your $PATH, and from then on use onexecuting /bin/ls renice. here is a crude implementation in Perl using Linux::Inotify2 (which, on Ubuntu, is provided by the liblinux-inotify2-perl package): perl -MLinux::Inotify2 -e ' Unfortunately, this won't tell you which process caused the event to trigger, but you can then check which /proc/*/exe are a symlink to the executable file in question and renice the process id in question.Į.g. Executing it will trigger an I_OPEN and an I_ACCESS event. If the processes in question are started by executing an executable file with a known path, you can use the inotify mechanism to watch for events on that file. Of course, the linux scheduler does a fairly good job at handling CPU bound threads by downgrading their priority and rewarding (upgrading) the priority of I/O bound threads - so even in high loads a script should be responsive I guess. notification events/hooks, which may have to be processed many more times per second. Lastly, considering the HIGH frequency of process changes, it may be better to handle all changes at once (polling at interval) vs. The overhead for that many different hooks might be much greater than simple polling. I don't think any OS is going to natively inform you of any change to any process metric. Kernel mode hooks are available for certain process related events in Windows (creation and destruction), but they not only aren't exposed at user mode, but also aren't helpful at monitoring other process metrics. I had a similar choice to make and have a hybrid solution in place. I develop a similar 'process and process priority optimization automation' tool for Windows called Process Lasso (not an advertisement, its free). Ironically, the more perfect solution may be the less efficient one in some cases. This is the real world though and sometimes compromises must be made. This is classic programmer 'perfection' thinking. That said, when hooks or notification events are available, or can be easily injected, they should certainly be used if the situation calls. If the polling overhead is low-enough, it far exceeds the added complexity, cost, and RISK of developing your own style kernel hooks to get notified of the changes you need. Sometimes polling is a necessity, and even more optimal in the end - believe it or not.
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