An ARM comparison: Raspberry Pi vs OpenRD Client

Bellow there’s a comparison between Raspberry Pi (Model B) and OpenRD Client, two low-power ARM SoC (System on a Chip), running Linux (Rasbian and Fedora respectively). I used the EEMBC CoreMark benchmark with default settings for 100000, 1000000 and 2000000 iterations. For each set, each device keep its performance with the same rate of iterations per second. The difference between the devices is at, an average level of, 520 iterations per second. That translates to 1.4x faster in favour of the OpenRD Client.

While OpenRD Client performs better, in terms of efficiency, Raspberry Pi seems to doing much better. In terms of CPU, Raspbeery Pi uses a 700MHz (with the possibility of setting it up to 1GHz) ARMv11 processor while OpenRD Client an older 1.2GHz Marvell Sheeva (ARMv5TE). ARMv11 supports an FPU unlike ARMv5 and that is one of the reasons that Raspberry Pi performs quite well despite its lower specifications. In terms of memory, Raspberry Pi uses 256MB DDR2 800MHz (newer models have 512MB RAM), in share with its relatively powerful GPU, while OpenRD Client uses 512MB DDR2 800MHz. OpenRD Client also provides Gigabit Ethernet as well as many more I/O interfaces. Also, OpenRD has preloaded OS, unlike Raspberry Pi that boots from an SD card. During this benchmark, Raspberry Pi was running Rasbian “Wheezy” (unofficial Debian port to armhf) while OpenRD Client Fedora 8.


(Raspberry Pi diagram – http://www.raspberrypi.org/wp-content/uploads/2012/04/Raspi_Iso_Blue.png)


(OpenRD Client Hardware Block diagram – http://www.globalscaletechnologies.com/skins/skin_1/images/OpenRD-Client_back.PNG)

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HPC-Europa2 Virtual Cluster liveDVD – milestone6 (final release)

The JRA2 team is proud to announce the release of HPC-Europa2 live DVD milestone 6. You can download milestone 6 ISO image (compressed with size 1.7 GB) from the below links:

CINECA (Italy) – http://www.hpc-europa.eu/?q=node/142
EPCC (Scotland) – http://hpce2jra2.epcc.ed.ac.uk/milestone6.iso.gz
HLRS (Germany) – https://fs.hlrs.de/projects/live-ptd/iso/milestone6.iso.gz

Release Note for Milestone 6
============================
The Virtual Cluster liveDVD:
* provides tools and libraries that are installed and used at the partner sites.
* emaulates the environment of the platforms available at HPC-Europa centers.
* allows hands-on building of a virtual cluster.

The liveDVD contains training and dissemination material published by the
HPC-Europa2 project, including material from the partner centers such as slides,
video tutorials and example code. Optional access to a source code repository enables
the migration of code and data from the Virtual Cluster to the user account created
on the HPC-Europa machines.

The liveDVD is based on SliTaz GNU/Linux, a free operating system, working completely
in RAM and booting from a removable media. The file size of the SliTaz GNU/Linux
3.0 ISO image is 29 MB. Hence, it leaves plenty of space for adding tools, libraries
and training material into this liveDVD. The SliTaz system is quick, responsive, and clean.
A lightweight and elegant desktop is included as well in the 29MB ISO image.

The milestone 6 ISO image has roughly the size of 3.8 GB including several tools
and libraries, as well as training material. Moreover, it contains a documentation
of how to build a virtual cluster using VirtualBox, and HPC-Europa2's Science and
Supercomputing in Europe research highlights for 2009 and 2010. Finally, this milestone
release addresses several bug fixes, such as firefox with flash support and
build scripts for Torque.

Since the previous release (milestone 5), existing packages have been updated, such as:
* MPICH2 to version 1.4.1p1
* Firefox to version 9.0.1 with flash support.
* Paraver to support the updated version of MPICH2.

In addition, this release has added several new packages:
* lava-1.0.6: Platform Lava - an open source version of Platform Load Sharing Facility (LSF).
* info (texinfo-4.13a) and man pages (man-db-2.6.0.2 and man-pages-3.35) for Linux documentation.
* Abiword and Gnumeric for office word documents and spreadsheets.
* Compiler wrappers (based on gcc and gfortran) to emulate Intel, IBM and NEC SX compilers.

You can download milestone 6 ISO image (compressed - size 1.7 GB) from the below link:
    http://www.hpc-europa.eu/?q=node/142

System Requirements
===================
* A laptop or computing with a DVD drive.
* Intel or AMD processor with a hardware virtualization support when using KVM
  and libvirt. Otherwise, this liveDVD can be run under VirtualBox or VMware or similar.

Known Issues
============
* PGI compilers require a license file in order to work (not included in this milestone).
* Totalview requires a license file in order to work (not included in this milestone).
  For requiring a demo license visit:
  http://www.roguewave.com/products/totalview-family/totalview.aspx
* On a MacBook Pro laptop, the mousepad does not work. Need to use an USB mouse
* Resizing video screen on VLC causes an unexpected exit of the program.
* VLC has no sound for viewing mkv videos.
* VLC cannot stream files or view incoming streams.

Acknowledgement
===============
This work was carried out under the HPC-EUROPA2 project (project number: 228398),
with the support of the European Community - Research Infrastructure Action of the FP7.

Shell script for NITROX calculations

The following script was developed for providing quick calculations over NITROX diving. It provides an interactive menu for the following calculations:

1 – Maximum Operational Depth (MOD)
2 – Operational Depth (OD)
3 – Best mix
4 – Equivelant Air Depth (EAD)
5 – Nitrogen percentage compared to Air
6 – Oxygen partial pressure (PO2)
7 – Central Nervous Systems Toxicity (CNS)
8 – Absolute pressure

############################################################################
# Copyright (C) 2011  Panagiotis Kritikakos <panoskrt@gmail.com>           #
#                                                                          #
#    This program is free software: you can redistribute it and/or modify  #
#    it under the terms of the GNU General Public License as published by  #
#    the Free Software Foundation, either version 3 of the License, or     #
#    (at your option) any later version.                                   #
#                                                                          #
#    This program is distributed in the hope that it will be useful,       #
#    but WITHOUT ANY WARRANTY; without even the implied warranty of        #
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         #
#    GNU General Public License for more details.                          #
#                                                                          #
#    You should have received a copy of the GNU General Public License     #
#    along with this program.  If not, see <http://www.gnu.org/licenses/>. #
############################################################################
#!/bin/bash

disclaimer()
{
echo "
=======================================================
Every individual diver is responsible for planning
and conducting dives using SCUBA equipment up to the
trained and certified qualification he or she holds.

The creator of this program does not have any
responsibility for symptoms of Decompressions Sickness
when the suggested values of this program are used
for conducting a dive.
========================================================
"
}
mod(){
   echo -n "NITROX mix: "; read mix
   MOD=`echo "scale=2; (((1.6/$mix)*10)*100)-10" | bc`
   echo " MOD for $mix NITROX: $MOD"
}

od(){
   echo -n "NITROX mix: "; read mix
   OD=`echo "scale=3; (((1.4/$mix)*10)*100)-10" | bc`
   echo " OD for $mix NITROX: $OD"
}

bestmix(){
   echo -n " Depth: "; read depth
   BESTMIX4=`echo "scale=2; 1.4/(($depth/10)+1)" | bc`
   BESTMIX6=`echo "scale=2; 1.6/(($depth/10)+1)" | bc`
   echo " Best mix for 1.4 PO2: $BESTMIX4"
   echo " Best mix for 1.6 PO2: $BESTMIX6"
}

ead(){
   echo -n " Depth: "; read depth
   echo -n " NITROX: "; read nitrox
   EAD=`echo "scale=2; ((((1-($nitrox/100))*4)/0.79)-1)*10" | bc`
   echo " EAD for $depth MSW and NITROX $nitrox: $EAD"
}

compare(){
   echo -n " NITROX: "; read nitrox
   EQU=`echo "scale=2; 100-(((1-($nitrox/100))/0.79)*100)" | bc`
   echo " ${EQU}% less nitrogen"
}

po2(){
   echo -n " Depth: "; read depth
   echo -n " NITROX: "; read nitrox
   PO2=`echo "scale=2; (($depth+10)/10)*($nitrox/100)" | bc`
   echo " PO2 at $depth MSW for NITROX $nitrox: $PO2 ATM"
}

cns(){
   echo -n " PO2 [1.4, 1.5, 1.6]: "; read po2
   echo -n " Duration: "; read duration
   if [ "$po2" == "1.4" ]; then
      CNS=`echo "scale=2; ($duration/150)*100" | bc`
   elif [ "$po2" == "1.5" ]; then
      CNS=`echo "scale=2; ($duration/120)*100" | bc`
   elif [ "$po2" == "1.6" ]; then
      CNS=`echo "scale=2; ($duration/45)*100" | bc`
   else
      echo " Choose between 1.4, 1.5 and 1.6 PO2"
      exit 1
   fi
   echo " CNS for $duration minutes and $po2 PO2: ${CNS}%"
}

absolute(){
   echo -n " Depth: "; read depth
   ABS=`echo "scale=2; (($depth/10)+1)" | bc`
   echo " Absolute pressure at depth of $depth MSW: $ABS ATM"
}

echo " 1 - Maximum Operational Depth (MOD)"
echo " 2 - Operational Depth (OD)"
echo " 3 - Best mix"
echo " 4 - Equivelant Air Depth (EAD)"
echo " 5 - Nitrogen percentage compared to Air"
echo " 6 - Oxygen partial pressure (PO2)"
echo " 7 - Central Nervous Systems Toxicity (CNS)"
echo " 8 - Absolute pressure"
echo
echo -n " Function: "; read option
disclaimer
case "$option" in
	1)
	  mod
	  ;;
	2)
	  od
	  ;;
	3)
	  bestmix
	  ;;
	4)
	  ead
	  ;;
	5)
	  compare
	  ;;
	6)
	  po2
	  ;;
	7)
	  cns
	  ;;
	8)
	  absolute
	  ;;
	*)
	  echo " Please choose a valid option from the menu"
	  exit 1
esac

HPC-Europa2 Virtual Cluster liveDVD – milestone 5

The fifth release of the HPC-Europa2 Virtual Cluster liveDVD is available (milestone 5) for download:

CINCENA (ITA) - http://www.hpc-europa.eu/files/iso/milestone5.iso.gz
EPCC (UK) - http://hpce2jra2.epcc.ed.ac.uk/milestone5.iso.gz

Release Note for Milestone 5
============================
The Virtual Cluster liveDVD:
* provides tools and libraries that are installed and used at the partner sites.
* emulates the environment of the platforms available at HPC-Europa centers.
* allows hands-on building of a virtual cluster.

The liveDVD contains training and dissemination material published by the HPC-Europa2 project, including material from the partner centers such as slides, video tutorials and example code. Optional access to a source code repository enables the migration of code and data from the Virtual Cluster to the user account created on the HPC-Europa machines.

The liveDVD is based on SliTaz GNU/Linux, a free operating system, working completely in RAM and booting from a removable media. The file size of the SliTaz GNU/Linux 3.0 ISO image is 29 MB. Hence, it leaves plenty of space for adding tools, libraries and training material into this liveDVD. The SliTaz system is quick, responsive, and clean. A lightweight and elegant desktop is included as well in the 29MB ISO image.

The milestone 5 ISO images has roughly the size of 3.7 GB including several tools and libraries, as well as training material.

Since the previous release (milestone 4), existing packages have been updated, such as:

* Open MPI to version 1.5.4
* Midori with flash support
* Firefox to version 7.0.1

In addition, this release has added a new package to support EVO (http://evo.caltech.edu/)

System Requirements
===================
* A laptop or computing with a DVD drive.
* Intel or AMD processor with a hardware virtualization support when using KVM and libvirt. Otherwise, this liveDVD can be run under VirtualBox or VMware or similar.

Known Issues
============
* Totalview requires a license file, which is no included, in order to work.
For requiring a demo license visit:
http://www.roguewave.com/products/totalview-family/totalview.aspx
* On a MacBook Pro laptop, the mousepad does not work. Need to use an USB mouse
* Resizing video screen on VLC causes an unexpected exit of the program.
* VLC has no sound for viewing mkv videos.
* VLC cannot stream files or view incoming streams.
* Flash cannot be viewed under Firefox. Use Midori instead.

Acknowledgement
===============
This work was carried out under the HPC-EUROPA2 project (project number: 228398),
with the support of the European Community – Research Infrastructure Action of the FP7.

HPC-Europa2 Virtual Cluster liveDVD – milestone 4

The fourth release of the HPC-Europa2 Virtual Cluster liveDVD is available (milestone 4) for download:

CINCENA (ITA) - http://www.hpc-europa.eu/files/iso/milestone4.iso.gz
EPCC (UK) - http://hpce2jra2.epcc.ed.ac.uk/milestone4.iso.gz
HLRS (GER) - https://fs.hlrs.de/projects/live-ptd/milestone4.iso

Release Notes for milestone 4
============================
The Virtual Cluster liveDVD:
* provides tools and libraries that are installed and used at the partner sites.
* emulates the environment of the platforms available at HPC-Europa centers.
* allows hands-on building of a virtual cluster.

The liveDVD contains training and dissemination material published by the HPC-Europa2 project, including material from the partner centers such as slides, video tutorials and example code. Optional access to a source code repository enables the migration of code and data from the Virtual Cluster to the user account created on the HPC-Europa machines.

The liveDVD is based on SliTaz GNU/Linux, a free operating system, working completely in RAM and booting from a removable media. The file size of the SliTaz GNU/Linux 3.0 ISO image is 29 MB. Hence, it leaves plenty of space for adding tools, libraries and training material into this liveDVD. The SliTaz system is quick, responsive, and clean. A lightweight and elegant desktop is included as well in the 29MB ISO image.

The milestone4 ISO images has roughly the size of 3.4GB including several tools and libraries, as well as training material.

Since the previous release (milestone3), existing packages have been updated. Moreover, new packages have been added, such as:

* Emacs version 23.1
* Firefox version 6.0.2
* covise-6.5.0: A collaborative visualization and simulation environment
* imagemagick-6.5.5: Imaging tools.
* libvirt-0.9.4: The virtualization API
* marmot-2.4.0: A tool for analysing and checking MPI applications
* modules-3.2.8: The modules environment.
* opennebula-2.2.1: A virtualization manager
* qcachegrind-0.6: A profile data visualization under Qt similar to KCachegrind.
* torque-3.0.0: Provides the binaries for the Torque Batch System.
* tcl-8.5.9, tcl-8.4: TCL scripting packages, dependencies for the modules environment.
* VampirTrace-5.11: Generates an OTF trace file, which can be analyzed and visualized  by the visualisation tool Vampir.
* MPI and OpenMP training material has been added.
* Tutorial has been provided on how to set up the Virtual Cluster.

System Requirements
===================
* A laptop or computing with a DVD drive.
* Intel or AMD processor with a hardware virtualization support.

Known Issues
============
* Totalview requires a license file, which is no included, in order to work. For requiring a demo license visit: http://www.roguewave.com/products/totalview-family/totalview.aspx
* On a MacBook Pro laptop, the mousepad does not work. Need to use an USB mouse
* Resizing video screen on VLC causes an unexpected exit of the program.
* VLC has no sound for viewing mkv videos.
* VLC cannot stream files or view incoming streams.

Acknowledgement
===============
This work was carried out under the HPC-EUROPA2 project (project number: 228398), with the support of the European Community – Research Infrastructure Action of the FP7.

Simulation vs Emulation

Many times I can see these two different terms being used the other way around in articles. Simulation (προσομοίωση) is the process of modelling an event or process in a virtual environment. The model is aware that is being simulated and is different that the real one. It is used to represent the actual model/object. Emulation (εξομοίωση) on the other hand, is the process of creating the desired environment for an application, or an object in general, to act like being in the expected environment. For instance, a standard i386 Linux OS can be emulated on a i386 virtual machine that runs on PPC hardware. Emulation mimics what is excepted by the targeted object. The LHC can be simulated in a computer model. The first moments of the big bang will be emulated within the physical accelerator. Particles are not aware where they are physically.

Ποιότητα και συνθήκες κάνουν τη διαφορά

Μακρυά από τη μιζέρια της νεο-ελληνικής πραγματικότητας, προ-κρίσης όσο και κατά τη διάρκεια αλλά και την μετά…

Από τον Όλυμπο στο Έβερεστ – http://www.anevenontas.gr/news/mountain/189-apo-ton-olimpo-sto-everest

Ναυτίλος – Εξερευνήσεις στις Ελληνικές Θάλασσες – http://www.explorenautilus.com