On an embedded system (Linux kernel 2.6.28 on ARM processor using glibc 2.6.1) I am running an application consisting of multiple threads. I would like one of those threads to get more CPU time than the others. One option for setting priorities seems to be to use pthread_setschedparam with SCHED_RR (or SCHED_FIFO), however this gives th...
I'm on a server running a Linux shell. I need to mail a simple file to a recipient. How to do this, prefereably using only the mail command? UPDATE: got a good solution, using mutt instead: $ echo | mutt -a syslogs.tar.gz [email protected] ...
Jonathan Leffler's comment in the question "How can I find the Size of some specified files?" is thought-provoking. I will break it into parts for analysis. -- files are stored on pages; you normally end up with more space being used than that calculation gives because a 1 byte file (often) occupies one page (of maybe 512...
While Windows releases of MySQL administration and profiling tools seem to be a dime a dozen, I'm having a very hard time finding very many designed for Linux. Note that I'm not looking for monitoring software ala Nagios/Munin here. This would be something more along the lines of a SQLYog. While I could write some basic scripts to han...
Hi. I'm currently using shared memory for IPC between Java and C++ apps, but looking for a more convenient alternative. Can someone advice better method, but with same performance speed? Thanks! ...
Hi. Does someone know how well the following 3 compare in terms of speed: shared memory tmpfs (/dev/shm) mmap (/dev/shm) Thanks! ...
This should be easy, just curious. I know "httpd" is the HTTP daemon, just curious what the relationship is between "httpd" and "apachectl." ...
IronPort developed a stackless threading model that allows the IronPort appliance to support more than 10,000 simultaneous connections in contrast to the 100 connections supported on a traditional OS. If one wanted to do the same but to make it open source, where should they start? ...
IronPort developed a high performance file system and an I/O driven scheduler optimized for the asynchronous nature of messaging (hence "Async"OS). If you wanted to do the same but make it open source, what exactly would need to change? ...
I would like to write a cross-platform function in C++ that contains system calls. What conditional compilation flags can I check to determine which operating system the code is being compiled for? I'm interested mostly in Windows and Linux, using Visual Studio and GCC. I think it should look something like this: void SomeClass::SomeFu...
Is there a good development IDE for Groovy/Grails code completion under Linux? ...
I'm having some problems getting ncurses' getch() to block. Default operation seems to be non-blocking (or have I missed some initialization)? I would like it to work like getch() in Windows. I have tried various versions of timeout(3000000); nocbreak(); cbreak(); noraw(); etc... (not all at the same time). I would prefer to not (expl...
I need to do a regex find and replace on all the files in a folder (and its subfolders). What would be the linux shell command to do that? For example, I want to run this over all the files and overwrite the old file with the new, replaced text. sed 's/old text/new text/g' ...
I am using /bin/tcsh as my default shell. However, the tcsh style command os.system('setenv VAR val') doesn't work for me. But os.system('export VAR=val') works. So my question is how can I know the os.system() run command under which shell? ...
I need to write some MAKEFILEs, but know nothing about them. Will someone please post some links to tutorials on how to create these wonderful files? I would like to study the basics of MAKEFILEs, from the beginning... ...
how can i know version of echo command as specified in the man page for echo echo --version should output version of echo command is it a bug in echo command or its documentation.. plz explain.. same is the case with echo help!! ...
I feel somewhat dumb asking this, but I'm relatively new to linux (more in terms of experience than time), and one thing that i've always wondered is if I can 'rejoin' (my own term) a process while it's running. For example, if I set a game server or eggdrop IRC bot to run in the background, is there a command I can use to view that pr...
I know, strange title.... this is my problem: I have the cakephp stack in /var/www/site from one view under controller A I do a jquery ajax call: $("#searchstring").autocomplete("/items/getitemsforautocomplete", { ... more code when the call is triggered I can see from firebug that cakephp wants to call: http://localhost/items/g...
I want to tail multiple files (and follow them) in CentOS, I've tried this: tail -f file1 file2 file3 but the output is very unfriendly I've also had a look at multitail but can't find a CentOS version. What other choices do I have? ...
I have a a directory with zip archives the zip archives contain .jpg, .png, .gif images I want to unzip each archive taking the images only and putting them in a folder with the name of the archive so files/archive1.zip files/archive2.zip files/archive3.zip files/archive4.zip open archive1.zip - take sunflower.jpg, rose_sun.gif...