Pages tagged with "linux" on monperrus.net

I've just successfully installed a printer Samsung ML-2525W on two Linux machines (Debian and Ubuntu). Here is what I did. >>> read more

Here is a small howto (for Linux/Debian/Ubuntu) to set up mldonkey to serve large files (to "seed" files on a "seedbox" in the P2P terminology), for instance to seed scientific datasets . >>> read more

To backup an IMAP account (e.g. Gmail on imap.gmail.com), mbsync (from the isync software package) is a very good solution. It backs-up all emails in a Maildir directory. Prerequisite Install isync: $ aptitude install isync Configuration file Create a file .mbsyncrc in your home directory. >>> read more

Modern disks have a physical sector size that is larger than 512B, but the software chain (BIOS, OS, partitioning tools) generally assumes a sector size of 512B. As a result, first, I/O requests that are smaller than the physical sector size are actually translated to larger requests. >>> read more

Cups is a printing software system that supports network printing. For instance, if a machine Timoleon is connected to a USB printer, one can access Timoleon over the network to print on the USB printer. The network printing facility also holds for network printers. >>> read more

It is not straightforward to install a Debian server on Amazon EC2. Indeed, Amazon provides as quick start Red Hat Linux, Suse Linux and their own Amazon Linux but not Debian linux. Fortunately, RightScale provides a very good public AMI image of Debian Squeeze (the latest stable version of Debian). >>> read more

Here is a description of a bug I encountered while working with jmdns. Problem Aug 26, 2011 12:16:52 AM javax.jmdns.impl.HostInfo newHostInfo WARNING: Could not intialize the host network interface on nullbecause of an error: beethoven: beethoven java.net. >>> read more

I run GNU/Linux (Debian/Ubuntu) on my DELL Latitude E4200. Graphics Graphics works perfectly with the "intel" driver of xorg. >>> read more

See also http://www.monperrus.net/martin/performance-of-amazon-elastic-block-store The maximal end-to-end latency of a hard-drive is achieved with accessing a random sector (it includes transfer time). The program seeker.c published at http://www.linuxinsight.com/how_fast_is_your_disk. >>> read more

My server regularly stalled, freezed and sometimes crashed under heavy write accesses (open-iscsi on root filesystem). I solved the problem by changing the scheduler and increasing the maximal I/O queue size (nr_requests). >>> read more

I recently encountered performance and reliability problems using iSCSI. One of the most efficient solutions was to set the I/O scheduler to "noop". Noop is the simplest elevator/scheduler in Linux. >>> read more

There are many cases where aligning the disk partitions yields better perfomance, for instance for database partitions, solid-state disks (SSD), and SAN storage with iSCSI. Here is the result of my Googling on this topic. >>> read more

I recently encountered some performance issues using iSCSI. I use the open-iscsi implementation on the client side. After hours of googling and trial and errors, here are some points related to the performance of iSCSI. >>> read more

ExpandAnimations is a LibreOffice/OpenOffice.org extension to expand animations before exporting to PDF. It is a fork of an excellent macro written by Matthew Neeley (see http://markmail.org/message/ewe336yoe6iennsf and https://gist.github.com/977752). >>> read more

On a Gnome desktop on Linux, gnome-power-manager is responsible for handling battery events and physical events (laptop lid closed, power button pressed, etc). The tool gnome-power-preferences configures it. In recent versions, gnome-power-* is built on top of Upower. >>> read more

I discovered recently the old key-value database paradigm and I am quite convinced. But what about the performance of different implementations? This document presents a comparison in the context of PHP. >>> read more

1/ creating the swap file of 512M (the size is set by parameter "count") $ dd if=/dev/zero of=/swap count=1000000 2/ configuring as swap $ mkswap /swap 3/ Adding "/swap none swap loop 0 0" to the file /ect/fstab 4/ Mounting the swap file. >>> read more

This document is a complete analysis of a challenging bug related to Xorg, an Intel graphics card and Linux. >>> read more

It's difficult to backup data if the target filesystem of your backup is vfat (e.g. on the external hard drive of your sister), and the source is ext3. The reason is that vfat has much less features compared to ext3 (e.g. the group information). >>> read more

Rsync is great for backuping data. However, it requires some advanced options to get a smooth backup from an ext3 filesystem to a vfat/fat16/fat32 one (e.g. >>> read more

This document presents how to use DejaVu fonts with x11: 1. Ensure that the freetype module is loaded by X (Load "freetype" in the section "Module" of xorg.conf) 2. Add the directory containing the TTF files of Dejavu (FontPath "/usr/share/fonts/truetype/ttf-dejavu" in the section "Files") 3. >>> read more

You may want to use "Computer Modern" fonts with OpenOffice.org on Linux for several reasons: * to have a latex look'n'feel * to produce PDF files that only contain Type1 fonts (see http://cadlab.cs.ucla.edu/~kohcc/sigdacdrom/instruct/fonts. >>> read more

I use kvm for running Windows XP on Linux and I am very happy :-) For me, it is the first fully satisfying virtualization experience. First KVM is extremely fast, from the viewpoint of the virtual system (i.e. >>> read more

There is a number of tools to save power on Linux by throttling the CPU(s). Some are daemon based for example cpufreqd, powernowd, powersaved, cpudyn. Some are desktop based for example kpowersave or gnome-power-manager. >>> read more

To upload files with PHP from the command-line, you can use curl as follows. curl -v -F filepassword=@myfile.png http://www.domain.com/upload.php The equivalent HTML form is: <form method="post" enctype="multipart/form-data" action="upload. >>> read more

Here is a solution for automounting usb flash drives / memory sticks on linux using only udev and pmount. 1. add a file automount.rules in /etc/udev/rules.d. 2. >>> read more

I have been needing a desktop search software for a long time. There are many tools for that, but I could not figure out which one is the best. That's why I made this comparison. I mainly found that beagle is the best one. >>> read more

I currently have a Dell Latitude E5400, and run Linux on it. Graphics (OK with default installation of Ubuntu 8.1 Intrepid) Graphics works perfectly with the "intel" driver of xorg (at least as of X.Org version 1.4.2). >>> read more

Table of Contents 1. Problem 2. Motivations 3. Scheme of resolution 4. Tools used 5. Parameters 6. Solutions 6.1. Assistantless 6.2. With assistant 6.2.1. SSH access on assistant (you do not need to be root) 6.2.2. Root access on assistant 6.2.3. >>> read more