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New demo available online: virtual nodes

We are pleased to announce that we have a new demo video online: Virtual Nodes.

This video shows how an e-mail server can be replicated with Virtual Nodes and demonstrates fault tolerance by switching off individual replicas.

Watch this video now!

Take a look at XtreemOS technical videos!


XtreemOS video tutorials

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Two XtreemOS video tutorials are now available online!

The tutorials can teach you the basics of using XtreemOS and performing administrative tasks in an XtreemOS grid, so that you do not have to start with reading the manuals.

  • The first tutorial teaches XtreemOS from the user's point of view,
  • The second tutorial is about easy and secure grid configuration wth XtreemOS operating system.


Give us your feedback on our video demos!

As part of our quality assurance plan, we would like to collect feedbacks on the XtreemOS demo videos that are currently available on our website.

You have quite probably had the opportunity to watch at least one of these videos (XtreemOS events or directly on our website), so we would greatly appreciate if you you take a few minutes of your time to complete this brief evaluation and share your feedback and comments with us.

Your responses will help us continue providing information on XtreemOS functionalities and capabilities that you find most useful/exploitable.
N.B. the questionnaires are completely confidential and you do not need to give any personal details whatsoever.

There are different surveys for the various video demos to evaluate:
(all XtreemOS screencast are available here)
  1. Wissenheim (video demo)
  1. Mobile Device Flavour
- Survey (a single survey for the 3 XtreemOS-MD demonstrations):
  1. XtreemOS technical demonstrations
- Survey (a single survey for all the XtreemOS technical demos):

The surveys are available till November 14, 2010.
We thank you in advance for your participation.


New demo video online: Checkpointing and restart

We are pleased to announce that we have another new demo video on-line: the checkpointing demo by John Mehnert-Spahn from the University of Duesseldorf.

All our technical video demos are avilable here


SC'10 - Comme and visit us at our XtreemOS booth!

The SC Conference is the premier international conference for high performance computing (HPC), networking, storage and analysis.

The XtreemOS project will be present at SC'10 at booth n°1631 (click here to see the conference floor plan).

A delegation of researchers from the consortium will showcase XtreemOS: the project current achievements will be presented, especially the last advancements, software release and demos (our third release will be out in the coming days).

XtreemOS participants: Christine Morin, Yvon Jégou, Pierre Riteau

Dates: November 13-19, 2010

Venue: Ernest N. Morial Convention Center, New Orleans, LA



Watch our XtreemOS promotional video!

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We have prepared a video to introduce to the capabilities of XtreemOS:

Take a look at it on the homepage of our project website

Enjoy ;-)

New XtreemOS demo video

We are pleased to announce that we have another new demo video on-line:

the  MaxDB replayer running on XtreemFS (by SAP)



Winners of our XtreemOS challenge


We are pleased to announce the final results of the challenge.

The selection committee unanimously voted for:

  •  Monte Carlo Simulation for Single-Photon Emission Computed Tomography with XtreemOS by Emanuele Carlini, Sebnem Erturk & Giacomo Righetti from University of Pisa, Italy,  as the winners and the recipients of the first prize.

The other two finalists are

  • Grid Security Operation Center by Syed Raheel Hasan, Jasmina Pazardzievska, Maxime Syrame (supervised by Julien Bourgeois) from Laboratoire Informatique, Université de Franche-Comté, France, (2nd prize) and,
  • Parallel Kriging by Alvaro Parra, Exequiel Sepulveda & Felipe Lema from ALGES lab at Universidad de Chile.

 Summary of the work carried out by Emanuele Carlini, Sebnem Erturk & Giacomo Righetti:

- Monte Carlo Simulation for Single-Photon Emission Computed Tomography with XtreemOS

"Single photon emission computed tomography (SPECT) is an imaging technique for the in vivo volumetric analysis of the distributions of radiopharmaceuticals. Our project focused on a Monte Carlo simulations of SPECT, which is composed by CPU-intensive tasks that take up to several days or months to complete even with state-of-the-art single-CPU computers
We adapted the job submission to the status of the platform in order to meet a target completion deadline, by tuning the number of machines at runtime, requiring more and/or faster machines whenever necessary, or, conversely, releasing heavy-loaded machines whenever they represent a bottleneck. XtreemOS offered us a number of tools and features which have been attractive in order to complete such goal. Besides the global security and authentication capabilities, we
specifically rely on the job deployment features of XtreemOS."

Video available here:

Winners of our XtreemOS challenge

Summary of the work carried out by Syed Raheel Hasan, Jasmina Pazardzievska, Maxime Syrame:

- "At present grid networks are working with very trusted sites. They share limited number of resources but the trend of interconnecting different grids is evolving with the passage of time. Specially by the innovation of desktop grids the risk is very high that grid networks will also be attacked like Brute force attack, Denial of Service attack(DoS) or Distributed Denial of Service attack (DDoS) etc. Grid Security Operation Center (GSOC) is the modern security operation center specific to counter these problems in grid computing networks."

Video available here:

Challenge - 2nd rank

Summary of the work carried out by Alvaro Parra, Exequiel Sepulveda & Felipe Lema

- "The intended application to run over XtreemOS is the parallel kriging implementation developed in C++. The current implementation is a multi process program where all parameters and options can be configured in a XML file. Output is a file containing the variable estimations of all defined nodes. The motivation is to run the application over the Grid5000 platform and make large scale experiments in order to make performance comparisons and measure scalability of the system. We want to measure what is the larger dimensionality that we can reach using this technology."

Video available here:





1 new XtreemOS-MD demo published

We have another new demo video on-line, again made by the TID team: "XtreemOS-MD On-Demand File Sharing demo".

The video is available here:
(right at the bottom of the page)


XtreemOS summer school: July 5-9, 2010 in Günzburg, Germany

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The presentations given during our 2nd summer school are available here

Summer school 2010


2 XtreemOS-MD demos now published

We are pleased to announce that we have two new demo videos online made by TID:

  • XtreemOS-MD Grid Media Player
  • Sharing a smartphone's 3G connection
PLease check this webpage: video demos



Grid'5000 Large Scale Deployment Challenge: results



For the first time, Grid'5000 users were invited this year to take part in a challenge to showcase tools and environments demonstrating the deployment of distributed or Grid middleware on Grid'5000. Teams were expected to demonstrate their know-how in the deployment of Grid (Glite, XtreemOS, Globus to name a few) or Cloud middleware. Participants were evaluated according to the following criteria:



  1. Deployment time, and number of sites and nodes deployed
  2. Complexity of the deployed middleware, and realism of Grid'5000 usage scenario for this middleware
  3. Ease of deployment by other users (documentation and script repository availability)
  4. Interest of the deployed middleware for the community
  5. Elegance of the solution


The Grid'5000 Spring School challenge winner is Pierre Riteau, who demonstrated the deployment of a sky computing environment based on nimbus in 31mn !
The runner-up is Marko Obrovac, who demonstrated scripts enabling the deployment of XtreemOS on Grid'5000. The script brought up an linux-ssi favour version of XtreemOS putting a virtual SMP of 156 processors online in less than 30mn.
Each win an ipod touch for their entry.


Kerrighed rc for XtreemOS

A Kerriged 3.0 release candidate is available at

Changes are the following:
   * [kernel] Port to linux 2.6.30
   * Add various options to checkpoint and restart
   * Add tools ipccheckpoint and ipcrestart to help checkpoint/restart of applications using IPC objects
   Kerrighed containerization
   * [kernel] Run Kerrighed in a Linux container
   * New tools krgboot[_helper] and krginit[_helper] to run Kerrighed in a Linux container
   * Fully automatic cluster boot
   Kerrighed hotplug
   * [kernel] Experimental support for adding nodes to a live cluster
   * New krgadm semantics:
     * kill commands 'cluster start' and 'wait_start',
     * make command 'nodes add' the default way to build a cluster

   * [kernel] Support migration of X connections
   * [kernel] Many bugfixes in socket migration
   * [kernel] Support migration / remote fork of chrooted applications
   * [kernel] Many migration fixes
   * Remove limitation on number of concurrent executions in KTP


Two new demos available

Two new demos made by BSC have been published on the project web page, namely hmmpfam/COMP Superscalar and SpecWeb2005:



XtreemOS summer school 2010

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Registration is now open!

We are organizing a second XtreemOS summer school in Reisensburg Castle,  Science Center of Ulm University, in Günzburg near Ulm, Germany from July 5th to 9th 2010.

Registration is now open!

The XtreemOS Summer School will include lectures on modern distributed paradigms such as Grid computing, Cloud computing, and network-centric operating systems. The Summer School will combine lectures from research leaders shaping the future of distributed systems and world leaders in deploying and exploiting distributed infrastructures. Hands-on laboratory exercises and practical sessions using XtreemOS will give participants experience on using modern distributed systems.

The aims of the XtreemOS Summer School are:

  • To introduce participants to emergent computing paradigms such as Grid computing and Cloud computing,
  • To provide lectures and practical courses on novel techniques to achieve scalability, highly availability and security in distributed systems,
  • To present Grid applications in the domains of E-science and business.
  • To provide a forum for participants to discuss your research work and share experience with experience researchers.


The school is open to postgraduate level students (MSc, PhD) and young researchers (from technical industries, research laboratories, and academic environments) who have recently started (or are about to start) working on grid research projects. Prospective students from computer science, computational science and application backgrounds will be encouraged to apply; Basic knowledge in distributed systems is the only prerequisite. Grid newcomers and beginners are welcome, but people already involved in grid projects should also benefit from this school.

 For more information, visit: xtreemos-events/summer-school-2010


HPC center Pisa workshops: XtreemOS for providing HPC services

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The use of XtreemOS on top of Grid and Cloud computing resources will be the topic of the upcoming workshop "X-HPC, XtreemOS for providing HPC services", hosted at the Department of Computer Science by the new-born HPC center of the University of Pisa.

The HPC center of the University of Pisa experiments with the latest and bleeding edge technology in hardware and software, like GPGPU technologies on ATI and NVIDIAdevices, and has been nominated the first ACER HPC competence center in Europe.

The X-HPC workshop will be held in Pisa, on Wednesday 16 June, in the Gerace room at the Computer Science Department of the University. Several industrial partners of the XtreemOS consortium and of the HPC center, like Kerlabs and Ferrari Racing Division, will join the event to provide their unique expertise and viewpoint. The workshop will showcase the latest XtreemOS LINUX distribution, which is currently under testing and evaluation on top of a network of computing resources provided by the Pisa HPC center, by INRIA, the Aladdin/G5K project, CNR and several other partner institutions of the XtreemOS consortium across all Europe.

XtreemOS Mobile Device flavour at EuroSys 2010

Alvaro Martinez Reol (TID) presented the XtreemOS MD flavour during the EuroSys 2010 conference (Paris, France) with a poster, demo and stand.


EuroSys 2010 - MD flavour

About 30 people came and visited the stand and both the poster and demo were explained directly to around 15. Conference delegates stopping at the XtreemOS stand seemed to be quite interested, not only in the MD part, but also in learning more about XtreemOS as a whole and about specific XtremOS components (XtreemFS, XtreemOS cluster flavour, use cases...).

Other visitors showed interest in XtreemOS and its possible advantages compared to other Grid solutions while others came to see the poster and GridPlayer video after they participated in the XtreemOS tutorial session.

Feedback on the XtreemOS tutorial given at Eurosys 2010

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The XtreemOS tutorial given at EuroSys 2010 consisted of three parts. The first part, presented by Guillaume Pierre (VUA), gave an overview of the system and of its architecture, introducing the VO management model, XtreemFS and the Application Execution Management system. The second part focused on the usage of XtreemOS, showing how the command-line and GUI tools can be used to execute applications and  to store data in a distributed fashion; the speaker for this part was Corina Stratan (VUA).  In the last part of the tutorial, Massimo Coppola (CNR) presented concepts related to the administration and security of XtreemOS, and explained how resources and Virtual Organizations can be managed.

EuroSys 2010 - tutorial (1)     EuroSys 2010 - tutorial (2)

The tutorial had approximately 25 participants, and some of them were interested in learning more about XtreemOS. From the questions asked during the tutorial, and also from the discussions that we had after the tutorial with some of the participants,  the aspects of interest were:
- what modules are needed by the XtreemOS kernel, and if there are any requirements for the other XtreemOS components
- if it is possible to package the XtreemOS components for other Linux distributions
- if it is possible to use XtreemOS with a custom job scheduler
- more details about the implementation of the XtreemOS components
- what are the applications used on top of XtreemOS
- in the case when a resource belongs to multiple VOs, how are the multiple certificates managed
- when a user submits a job, how does the system find resources that meet the requirements and that also allow the user to run applications


XtreemOS demo at CCGrid 2010

"XtreemOS, a GRID Operating System" has been accepted for demonstration at the 10th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGrid 2010), May 17-20, 2010, Melbourne, Australia.

The research demo is scheduled to be held on May 19th, 2010 as a plenary from 4:00pm to 6:00pm. Please visit for more details.

For the final program of the event and any other updates, please check CCGrid 2010 website regularly:

Demo presenter: Yvon Jégou (INRIA)


XtreemOS at 5th EGEE user forum

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XtreemOS will be present in Uppsala (Sweden) next April for the 5th EGEE User Forum:

A demo of the XtreemOS system is scheduled on April 14 (demo session 2):