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Here is a simple test program to call SHA1 hashing routine from OpenSSL. #include <stdio.h> #include <string.h> #include <openssl/sha.h> int main (int argc, char *argv[]) { unsigned long i, n; unsigned char md[1024]; if (argc <= 1) return 0; n…
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Peter Kankowski wrote a very interesting article on hashing functions. It compares a number of current hash functions and conducts some performance benchmarks. iSCSI CRC Meiyan Murmur2 XXHfast32 SBox (dead link: https://home.comcast.net/~bretm/hash/10.html) Larson XXHstrong32 Sedgewick Novak…
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Here is an article GNU C: Extensions to the C Language Family about extensions in GNU C vs. ANSI C. Nested functions, i.e., a function defined within another function Double-word integers, i.e., 64 bit signed and unsigned long long int and unsigned long long int Arrays of variable length, f(int z)…
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Recently I learned the hard way that IBM Enterprise COBOL compiler for z/OS (mainframe) cannot generate 8-byte long POINTER variables, but only 4-byte pointers. This means, you cannot use more than 2GB in COBOL on a mainframe. I.e., you cannot make use of AMODE=64 with COBOL on the mainframe. You…
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Generators (and therefore coroutines) are now part of PHP (Wikipedia) 5.5, as of 20-Jun-2013. Here is an example: function xrange($start,$end) { for ($i = $start; $i<=$end; ++$i) yield($i); } The Icon programming language (Wikipeda) was one of the first computer languages where…
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I read a short note in Heise, that in 2011 WordPress was one of the most popular CMS. The report compared Alfresco WCM CMSMadeSimple Concrete5 DotNetNuke Drupal e107 eZ Publish Joomla! Liferay MODx Movable Type OpenCms Plone SilverStripe Textpattern Tiki Wiki CMS…
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I ran below commands under different load for my Gigabyte GTX 560 graphic card. export LD_LIBRARY_PATH=$CUDA_PATH/lib64 time /usr/local/cuda/samples/sdk/0_Simple/matrixMul/matrixMul time /usr/local/cuda/samples/sdk/0_Simple/matrixMulCUBLAS/matrixMulCUBLAS I was interested in the value…
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I copy Brian Koberlein's explanations on the history of Kepler's law. Kepler’s first two rules, that the orbit of a planet is an ellipse, and that a line drawn from the Sun to a planet sweeps out area at a constant rate were proposed in 1609. While these rules allowed for a more accurate…
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There is a an INCITE program (HPC Call for Proposals), where one can apply for CPU/GPU intensive jobs, the link is INCITE (dead link). From the FAQ: The INCITE program is open to US- and non-US-based researchers and research organizations needing large allocations of computer time, supporting…
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Bisher habe ich mit der Firma Unitymedia ausschließlich positive Erfahrungen gemacht. Sie sind es wert, kurz festgehalten zu werden. Am 20. August 2009 habe ich bei Unitymedia Internet (20MBit/s) und Telefon bestellt. Am nächsten Tag stand ein Herr Niclas Roth von Computer-Füchse vor der Tür…
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For internet connection I use a cable modem EPC3208 from Cisco, which was supplied by the cable provider, Unitymedia (now Vodafone) in my case. It shows the following measurements regarding signal-to-noise ratio, modem is at 192.168.100.1: More information on this modem can be found here: Cisco…
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Mainframe rehosting is about replacing the whole mainframe with one or multiple Linux boxes, or at times, move portions of the application landscape from the mainframe to Linux. Thereby you basically keep many of the hitherto used development- and runtime-environment, like COBOL, DB2, IMS, CICS,…
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Impressive numbers from WordPress.com: 827 terabytes of data, 400.000 new users, 7 million logins, 1 billion of pageviews. From March Wrap-Up, written by Matt Mullenweg: In March we brought you P2, an awesome theme perfect for short-form and group blogging, made with love by Automatticians. Next,…
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Loop unrolling is not only good for sequential programming, it has similar dramatic effects in highly parallel codes as well, see Unrolling parallel loops (local copy), also see #pragma unroll in the NVidia CUDA programming guide. Some bullet points of the presentation: More resources consumed per…
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See how to use ttf fonts in xterm in the NetBSD tutorial. To get TrueType fonts by default in uxterm or xterm I added the following lines in .Xdefaults: XTerm*faceName: Bitstream Vera Serif Mono XTerm*faceSize: 14 UXTerm*faceName: Bitstream Vera Serif Mono UXTerm*faceSize: 14 It didn't work if I…
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Very good article on open company communication by Sara Rosso, who works for WordPress. The article below centers around these headlines. Be distributed Be Online Be Transparent Work Hard, Play Hard When I Have Time by Sara Rosso Update: I gave a similar presentation at LeWeb about the Future…
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Instead of starting X like xinit /usr/bin/icewm and therefore loading the NVidia CUDA environment, one can simply add [ -c /dev/nvidia0 ] || mknod -m 666 /dev/nvidia0 c 195 0 [ -c /dev/nvidiactl ] || mknod -m 666 /dev/nvidiactl c 195 255 to `/etc/init.d/boinc-client` assuming one has a single…
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Interesting slides from Valve on their venture to Linux: Porting Source to Linux - Valve's Lessons Learned
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See an article by a guy named johnraff, Access Google translate from a terminal, or reblogged by Dmitry Sandalov here Access Google translate from a terminal. Works great. Here are some examples: translate Weg Way translate "Ich gehe nach Hause" I'm going home