Admins eHow SysAdmin Tips & Tricks

October 24, 2012

The proper way to benchmark disk write performance in Linux

Filed under: CentOS,Debian,linux — Tags: , , , , — admin @ 7:46 am
dd bs=1M count=512 if=/dev/zero of=test conv=fdatasync

The result is something like this :
512+0 records in
512+0 records out
536870912 bytes (537 MB) copied, 1.43334 s, 375 MB/s

July 16, 2010

How to install Byte UnixBench on debian lenny

Filed under: Debian,General — Tags: , , , , , , — admin @ 2:28 pm

From UnixBench website :

UnixBench is the original BYTE UNIX benchmark suite, updated and revised by many people over the years.

The purpose of UnixBench is to provide a basic indicator of the performance of a Unix-like system; hence, multiple tests are used to test various aspects of the system’s performance. These test results are then compared to the scores from a baseline system to produce an index value, which is generally easier to handle than the raw scores. The entire set of index values is then combined to make an overall index for the system.

Some very simple graphics tests are included to measure the 2D and 3D graphics performance of the system.

Multi-CPU systems are handled. If your system has multiple CPUs, the default behaviour is to run the selected tests twice — once with one copy of each test program running at a time, and once with N copies, where N is the number of CPUs. This is designed to allow you to assess:

  • the performance of your system when running a single task
  • the performance of your system when running multiple tasks
  • the gain from your system’s implementation of parallel processing

Do be aware that this is a system benchmark, not a CPU, RAM or disk benchmark. The results will depend not only on your hardware, but on your operating system, libraries, and even compiler.

First install required libraries for compilation :

apt-get install libx11-dev libgl1-mesa-dev libxext-dev perl  perl-modules make

Then get the unixbench and run it :

tar zxvf unixbench-5.1.2.tar.gz
cd unixbench-5.1.2

April 10, 2010

Benchmark network throughput between 2 systems

Filed under: General,Windows — Tags: , , , , , , — admin @ 2:22 pm

Today I had 2 systems connected to each other with Mellanox MT25208 InfiniBand cards with 40Gbps speed ( it is fast , isnt it ? 😀 ) , after setting up IPoIB ( IP on InfiniBand ) on cards. I wanted to make sure I really have 40Gbps speed , so I searched the net for a network throughput benchmark utility and I found a great software named PCAUSA Test TCP (PCATTCP)
You can download its latest version from its original site : Original Download Page
Or from my site :
Usage :
you have to run a receiver on one of systems by following command :

PCATTCP.exe -r

the default setting was not optimized for testing a 40Gbps line , so I used the following command on transmitter part :

PCATTCP.exe -t -l 819200 -n 1024 is the IP of receiver part.
You are curious to know the result ? 😀 Here it is :

PCAUSA Test TCP Utility V2.01.01.11
Started TCP Transmit Test 0...
TCP Transmit Test
  Transmit    : TCP ->
  Buffer Size : 819200; Alignment: 16384/0
  Connect     : Connected to
  Send Mode   : Send Pattern; Number of Buffers: 1024
  Statistics  : TCP ->
838860800 bytes in 1.97 real seconds = 416683.62 KB/sec +++
numCalls: 1024; msec/call: 1.97; calls/sec: 520.85

Yes , I have a working 40Gbps line 😀

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