unix4lyfe.org

unix4lyfe.org

When you need a web server in a hurry. My notes and other stuff:. And disks that lie about them. Examples of what it can do. Discrete Cosine Transform in 2D. Of a point in 2D. And programming (and HN traffic. Zpool mirror to raidz. In 1D and 2D. In assembler on Linux on x86 64. Randomly generating a floating point number. What does " Incorrect key file. Using mod rewrite to redirect requests based on referer. Sort of a Darcs done wrong. Unix4lyfe T-shirts now available in XXL and XXXL!

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When you need a web server in a hurry. My notes and other stuff:. And disks that lie about them. Examples of what it can do. Discrete Cosine Transform in 2D. Of a point in 2D. And programming (and HN traffic. Zpool mirror to raidz. In 1D and 2D. In assembler on Linux on x86 64. Randomly generating a floating point number. What does Incorrect key file. Using mod rewrite to redirect requests based on referer. Sort of a Darcs done wrong. Unix4lyfe T-shirts now available in XXL and XXXL!

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1 unix4lyfe org

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3 software i maintain

4 darkstat

5 realtime network statistics

6 darkhttpd

7 4kb sectors

8 anti lamenessing engine

9 discrete cosine transform

10 rotation

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unix4lyfe.org | unix4lyfe.org Reviews

https://unix4lyfe.org

When you need a web server in a hurry. My notes and other stuff:. And disks that lie about them. Examples of what it can do. Discrete Cosine Transform in 2D. Of a point in 2D. And programming (and HN traffic. Zpool mirror to raidz. In 1D and 2D. In assembler on Linux on x86 64. Randomly generating a floating point number. What does " Incorrect key file. Using mod rewrite to redirect requests based on referer. Sort of a Darcs done wrong. Unix4lyfe T-shirts now available in XXL and XXXL!

INTERNAL PAGES

unix4lyfe.org

1

Benchmarking

https://unix4lyfe.org/benchmarking

These are my notes on benchmarking CPU-bound code. This article is specific to the i7-2600K Sandybridge CPU I'm currently (2014) using, but a lot of it will generalize to both earlier and later CPUs. Instruction is used to read the Time Stamp Counter. How to call RDTSCP from C. Uint64 t rdtscp(void) { uint32 t lo, hi; asm volatile ("rdtscp" : /* outputs */ "=a" (lo), "=d" (hi) : /* no inputs */ : /* clobbers */ "%rcx"); return (uint64 t)lo ( (uint64 t)hi) 32); }. The upper 32 bits are loaded into. Can be...

2

Automatic vectorization

https://unix4lyfe.org/autovec

Short version: write a naïve kernel. Before you look at the generated assembler, write a wrapper around the kernel. Void add1(float a[4], float b[4]) { for (int i = 0; i 4; i) { a[i] = b[i]; } }. Gcc version 4.9.1 invoked as. G -S -O3 -march=corei7-avx -masm=intel add.cc. Add1(float*, float*) $. The x86 64 calling convention is that the first two arguments are passed in the. Is 32 bits wide. The compiler unrolls the loop into four copies of:. Xmm0 = xmm0 b[n]. Why didn't it vectorize? Ingle precision ( s.

3

VDPPS is slow

https://unix4lyfe.org/vdpps-is-slow

Instruction for Dot Product of Packed Single Precision Floating-Point Values. As of Jan 2014, on my Intel Core™ i7-2600K CPU @ 3.40GHz (Sandy Bridge),. Is 128.39% /- 0.04% slower at 95% confidence than a non-vectorized implementation of dot product. (That is,. Has 228x the runtime of the alternative.). Calculates the dot product of two 128-bit. Registers, each containing up to four. S Using a mask, we can exclude some of the components from the sum, e.g. to calculate the dot product of 3-vectors. N Min M...

4

darkstat

https://unix4lyfe.org/darkstat

Captures network traffic, calculates statistics about usage, and serves reports over HTTP. Traffic graphs, reports per host, shows ports for each host. Embedded web-server with deflate compression. Asynchronous reverse DNS resolution using a child process. Small Portable. Single-threaded. Efficient. Darkstat-3.0.719.tar.bz2. 117,695 bytes, May 2015). Once built, this is all it takes to get darkstat running:. Without much trouble on your part. It has been reported to build on:. FreeBSD, NetBSD, OpenBSD.

5

Time

https://unix4lyfe.org/time

First written in 2006 or before. Last modified 3 Mar 2015. Some notes about time:. The time at zero degrees longitude (the Prime Meridian) is called Coordinated Universal Time (UTC is a compromise. Between the French and English initialisms). UTC used to be called Greenwich Mean Time (GMT) because the Prime Meridian was (arbitrarily) chosen to pass through the Royal Observatory in Greenwich. According to POSIX.1, Unix time is supposed to handle a leap second by replaying the previous second. e&#4...5900 ...

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Jump to main navigation and login. Red Hat / RHEL. This website contains information about all kind of things on Unix systemen and also the configuration of it. At the moment a lot about the Raspberry Pi ;-).

unix4lyfe.org

When you need a web server in a hurry. My notes and other stuff:. And disks that lie about them. Examples of what it can do. Discrete Cosine Transform in 2D. Of a point in 2D. And programming (and HN traffic. Zpool mirror to raidz. In 1D and 2D. In assembler on Linux on x86 64. Randomly generating a floating point number. What does " Incorrect key file. Using mod rewrite to redirect requests based on referer. Sort of a Darcs done wrong. Unix4lyfe T-shirts now available in XXL and XXXL!

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Чтобы не забывали …. Просто юмор …. Такой подлянки Кудимыч от неё не ожидал. Сорок лет трудового стажа, тридцать восемь лет семейного, восемнадцать грамот и дипломов, две медали, три значка, семьдесят две премии, эквивалентные двум полулитрам и четырём пирожкам с мясом, шестнадцать бесплатных путёвок в разные стороны в пределах железного занавеса! Одна квартира, полтора дома, гараж, автомобиль Опель 1993 года выпуска! Read more →. XenServer: Меняем мастера пула. Read more →. Read more →. Read more →.

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Friday, August 31, 2012. It copies a file or a group of files. Copying file overwrites without warning the destination file if it already exists. SYNTAX: $cp source target. Cp file1 file2 dir1 (used for copying file to directory). Used to delete a directory. It is used to change from one directory to other. Note: cd. or cd is used to come out from directory. It is used to create directory. Mkdir dir dir / subdir dir1 / subdir1. Mkdir Unix Unix/u (Used to create sub directories). Echo "Welcome to Unix".

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