Tag: Linux
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Linux Photo Processing
At LinuxFest Northwest 2013 April 28/29, I will be giving a talk comparing the GIMP and Darktable. These are two very powerful photo manipulation tools. I am particularly looking at two programs that provide a strong post-processing capability. You use them for different purposes and how they are used is quit different as well. There…
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Backups: using tar and find
If you are familiar with zip files, they are the DOS version of tar files (tar = Tape Archive). The tar utility is totally intended for storing backups. A quick way to backup your home directory is: cd /home ; tar -cvf home-jed.tar ./jed You might see that command grab a whole lot of stuff…
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Backups: outline
Here’s some basic programs and techniques I’ll be covering about backups. tar rsync find date how to write “now” using date how to find files newer than your last backup all this will be done in bash
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Backups: Using rsync and find.
I’m doing a talk at Linuxfest Northwest on making Very Sexy Backup Scripts. This is because you are more empowered when you know your filesystem and a little bit of bash scripting on your sweet linux system. I’ll start with an out-of-order post showing rsync and find. If you don’t know [[WTF]] I’m talking about,…
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Improve SSD performance on Linux
I had little idea that you could so easily change the disk scheduler in linux. I’m actually rather relieved I can do it in grub, or even live. I’ll have to do this on my workstations with SSDs. Four Tweaks for Using Linux with Solid State Drives | Tombuntu.
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Linux Random Numbers
This explanation from the article comparing /dev/urandom and /dev/random is priceless admin info: The kernel RNG produces two user-space output streams. One of these goes to /dev/urandom and also to the kernel itself; the latter is useful because there are uses for random numbers within the kernel. The other output stream goes to /dev/random. The…
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I had no idea t…
I had no idea that non-Intel processors had boundary restricted byte operations. This certainly could mean general network speedup. It ultimately turned out that certain device drivers were exposing a problem in the alignment handler. By accessing misaligned IP header fragments, the driver concerned was triggering an alignment exception within an atomic-critical section of kernel…
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Standing Workstation 2012
I’ve been computing at a standing workstation since 2010, and since then I haven’t had my lower back bother me for a while. When beginning my new job at Candela Technologies, I got a new workstation and decided to build…eh…over-build an adjustable multi-monitor standing workstation. Turns out it looks a lot like a mining frame…
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Hard Lockup CPU1
Friday morning was the first time I’ve ever seen one of my linux machines issue a hard lockup. I wonder if there was a power surge in the evening and it woke up and slept again, so when I booted it, it didn’t know what power state it was at. Luckily, this system seems fine…
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Pentax and Linux
Apparently it might be possible to make Linux chew on a tethered Pentax DSLR. http://inside-photography.blogspot.com/2008/07/being-linux-user-can-be-tough-at-times.html http://forums.dpreview.com/forums/read.asp?forum=1036&message=39004448 http://pktriggercord.sourceforge.net/ http://libregraphicsworld.org/blog/entry/pktriggercord-makes-tethered-shooting-with-pentax-dslr-possible-in-linux So many fun projects out there!
Bitratchet 