banner

The site's hierarchy



Home page :: Private area :: Site Map :: Credits
Conferences / Horizon NYC Workshop

Navigation

Mar 2009
MTWTFSS
2324252627281
2345678
9101112131415
16171819202122
23242526272829
303112345
News
  • CINES received a 150 TFlops machine
  • GENCI has acquired for the French University Supercomputing Center a 12288 core SGI Altix. It is ranked 14th in the World and first in France.
  • Site Web du CINES
  • IDRIS received a 140 Tflops BlueGene/P machine.
  • The CNRS supercomputing centre has acquired a new BlueGene machine with 40480 processors and 20 To of RAM memory.
  • See the press release.
  • Mare Nostrum simulation down to z=1.55
  • We carried out our fourth run of MareNostrum down to z=1.55 while producing 150 Million "stars". More info is given here
  • Horizon 4Pi 4096^3 down to z=0
  • We have carried a full sky 2Gpc/h 4096^3 Dark Matter simulation down to z=0. More details can be found here
  • Horizon 4Pi run 2048^3 completed
  • We have completed a full sky cone run of DM with RAMSES on platine CEA with 2048^3 particles. See a slice here
  • Mare Nostrum @ z=1.9
  • We carried out our third run of MareNostrum down to z=1.9 while producing 120 Million "stars"
  • Mare Nostrum simulation down to z=2.4
  • We carried our second run on the Mare Nostrum supercomputing center down to z=2.4, thanks to 4-fold improvement in overall performance.
  • 1024^3 500 h-1Mpc simulation completed
  • RAMSES run of the HORIZON initial condition was carried down to z=0 using 1024^3 dark matter particles in a (500 Mpc/h)^3 box with up to 16 levels of refinement (corresponding to local effective resolution of 65536).
  • Horizon 1024^3 100 Mpc/h simulation completed.
  • A RAMSES run of the HORIZON initial condition was carried down to z=0 using 1024^3 dark matter particles in a (100 Mpc/h)^3 box with up to 16 levels of refinement (corresponding to local effective resolution of 65536).
  • A 43 Tflops supercomputer at CEA
  • CCRT, the supercomputing centre of CEA, has just received a new BULL supercomputer with 6800 processors and 13.6 Tb of RAM memory. This facility is dedicated to academic and industrial research.
  • Lire le communiqué
  • Fourth Horizon Workshop 2006b
  • The 4th workshop takes place from December, the 11th to December, the 12th at Paris Observatory. Registration form available here.
  • MareNostrum simulation has started at BSC
  • After 1 week of operations, we have reached redshift 4. The simulation will proceed further more during the next quarters. We have started to post-process these initial data.
  • Horizon Grid
  • The Horizon grid is now in operation. It links the 6 quadri opteron of Meudon, Paris, Lyon, Saclay, IAP and Marseille and is open to all members of the collaboration. Voir ce lien
  • http://grille.projet-horizon.fr
  • Third Horizon Workshop 2006a
  • Horizon Workshop 2006a 10, 11 and 12 april 2006 in Lyon. It will be dedicated to progress reports. Registration form
  • Horizon is part of the DEISA "Extreme Computing Initiative"
  • Horizon will launch one extreme application for galaxy formation using the DEISA infrastructure at Mare Nostrum http://www.bsc.es
  • DEISA web site
  • Second Horizon Workshop
  • Horizon Workshop 2005 took place at Paris Observatory the 14th and 15th november. It was dedicated to internal discussions and management issues.
  • November 2005: Horizon méso-machine is fully operational at HPC1
  • October 2005: Horizon was awarded a 500 k€ grant by ANR, the French Science Foundation.
  • Horizon response to «ANR Blanche» Call for Proposals has been succesfull in the «UNIVERS» program.
  • ANR web site
  • July 2005: HP France was selected to host the Horizon "meso-computer"
  • HP company has succesfully answered the "call for proposals" issued by the Hrizon Project for a medium-size dedicated super-computer. The computer will be hosted at HPC1, the HP high performance computing center near Paris.
  • February 2005: INSU and CEA agree to fund the Horizon "meso-machine".
  • Horizon has submitted to INSU a proposal for funding a medium-size computer dedicated to the project. The proposal was accepted as a joint CEA and INSU operation.
  • September 2004: Kick-off meeting in Paris
  • During 3 days (13, 14 and 15 of september), 30 scientists have met at Observatoire de Paris to set up the basic organisation and objectives of the Horizon Project.
  • KO Meeting
  • June 2004: Project report at SF2A in Paris
  • April 2004: Horizon received official support from ASSNA.
  • The french initiative «Action Spécifique pour les Simulations Numériques en Astrophysique» have given to the Horizon project its "label" for outstanding and structuring computational project.
  • April 2004: The french Astroparticule program provides financial support for the Horizon "mini-grid"
  • The Programme Astro-Particule, a joint IN2P3 and INSU initiative, has agreed to finance 6 quad AMD64 servers dedicated to the Horizon Project.
  • January 2004: Review by PNC and PNG
  • Both PNG and PNC scientific comitees are officially supporting the Horizon Project initiative.
  • June 2003: Presentation of the project to SF2A
  • Theoretical Virtual Observatory workshop (IAP April 5-6, 2006)
  • A workshop dedicated to the Theoretical Virtual Observatory will take place at IAP on April 5-6th.

    The goal is to bring together experts of the Virtual Observatory and theoreticians who would like to make results of their simulations (e.g. databases or catalogs) or numerical codes available to the worldwild astronomical community.

  • Program and speakers

Horizon NYC Workshop

"Extreme" Cosmological Hydro Simulations

by Devriendt Julien (Tuesday 11 April 2006)

- Information
- Program
- Participants
- Conclusion

Practical Information:

The workshop will take place from the 19th to the 22nd of December 2005 in New York City and will be hosted by Greg Bryan (gbryanatastro.columbia.edu) at the Department of Astronomy of Columbia University.

Participants will be lodged at the Milburn Hotel:

The Milburn Hotel
242 West 76th Street
New York, NY 10023
Tel: (212)-362-1006
Toll Free: 1-800-833-9622

http://www.milburnhotel.com

Participants are expected to pay for their hotel rooms themselves (at the Columbia rate of $145/night+tax), and to later get reimbursed by sending their receipts to Romain Teyssier at the following address:

Service d’Astrophysique
CEA Saclay Batiment 709
L’Orme des Merisiers
F-91191 Gif-sur-Yvette Cedex
Fax: +33 1 69 08 65 77

The meeting will take place in room 1402 (14th floor Library) of the Pupin Physics Lab, which is located in the north-west corner of the Columbia campus. The main campus entrance is at 116th St. and Broadway. Directions to the Pupin Physics Lab can be found at:

http://www.astro.columbia.edu/direc...

The easiest way to get from the hotel to the Columbia campus is to take the number 1 (red) subway in the Uptown direction to the 116th street stop (5 stops). The subway costs $2 per ride and requires the purchase of MetroCards, which can be bought using automatic machines in any subway station. The subway stop nearest to the Milburn hotel is at the corner of 79th St. and Broadway. For a subway map, see

http://www.mta.nyc.ny.us/nyct/maps/...

The hotel is just a few blocks away from The American Museum of Natural History (79th St and Central Park West), and of course, just a few blocks from Central Park itself.

Program:

The main goal for this meeting is to come up with a list of the best possible "extreme" simulations related to galaxy formation in a cosmological context, where best is to be understood in terms of the science they will address. By "extreme" we mean either extremely large simulations (e.g. 10 billion particles and hydro cells, 5 levels of AMR refinement) or extremely resolved simulations (e.g. 10 million particles and hydro cells but 30 levels of AMR refinement), or a combination of both :-). Therefore, we will have to review / discuss the supercomputers available to run such simulations, and the codes most suited to run them.

As this is a workshop, the major part of the time is obviously devoted to discussion. However, to trigger and lead these discussions we have chosen a format in which a general presentation of a hot scientific topic — which is expected to last about 15 minutes and certainly no more than a half hour — is given by a "chair(wo)man" or "pundit" which naturally opens on a question / discussion session. In summary, a short presentation, a list of key questions to address / discuss and an example of an "extreme" simulation designed to tackle a key issue is requested from each of the primary presenters / discussion leaders.

Of course, all participants are more than invited (especially those who do not chair a session) to prepare questions / issues they would like to see discussed for each topic.

As a tentative title for the workshop, one could then think of:

"Extreme" Cosmo Hydro Simulations: Which Scientific Issues To Address?

A list of possible topics with a loose schedule and suggested chair would then be:



Monday morning (9:30 am - 12 pm):

  • Numerical techniques and supercomputing centers: state-of-the-art and availability vs size of simulations.
PDF - 1.1 Mb
R. Teyssier’s presentation

Chairman: Romain Teyssier

Monday afternoon (1:30 pm - 4 pm):

  • First stars, proto-galaxies and reionization.
PDF - 5.2 Mb
G. Bryan’s presentation

Chairman: Greg Bryan


Tuesday morning (9:30 am - 12 pm):

  • ISM: molecular cloud and star formation within galaxies
PowerPoint - 19.6 Mb
A. Slyz’s presentation

Chairwoman: Adrianne Slyz

Tuesday afternoon (1:30 pm - 4 pm):

  • High-z (but post-reionization) galaxies (LBG-like objects) and their impact on the IGM
PowerPoint - 6 Mb
A. Kravtsov’s presentation

Chairman: Andrey Kravtsov


Wednesday morning (9:30 am - 12 pm):

  • Galaxies in Clusters and Groups (at high and low z): interactions with and impact on the ICM
PowerPoint - 14 Mb
G. Yepes’ s presentation

Chairman: Gustavo Yepes

Wednesday afternoon (1:30 pm - 4 pm):

  • Galaxies in Large Scale Structures
PDF - 14.3 Mb
J. Blaizot’s presentation

Chairman: Jeremy Blaizot


Thursday morning (9:30 am - 12 pm):

  • Summary of the Workshop: consensus ranking of what are the "most sexy" extreme simulations

Chairman: Stefan Gottloeber



List of participants:

Surname First Name Arrival Date Departure Date
Aubert Dominique 18/12/2005 22/12/2005
Blaizot Jeremy 18/12/2005 22/12/2005
Bryan Greg 18/12/2005 22/12/2005
Devriendt Julien 18/12/2005 22/12/2005
Gottloeber Stefan 17/12/2005 22/12/2005
Kravtsov Andrei 18/12/2005 22/12/2005
Pichon Christophe 18/12/2005 22/12/2005
Rasera Yann 18/12/2005 22/12/2005
Slyz Adrianne 18/12/2005 22/12/2005
Sousbie Thierry 18/12/2005 22/12/2005
Teyssier Romain 18/12/2005 22/12/2005
Yepes Gustavo 17/12/2005 21/12/2005

Brief summary / conclusions of this workshop:

The workshop led to the conclusion that to cover all aspects of galaxy formation (overlap of length and mass scales from proto-galaxies at high redshift to cD monster galaxies located at the center of the richest clusters), one would need a set of minimum 3 extreme simulations:

  • A large box (500 Mpc/h) to obtain a statistically meaningful sample of massive (10 keV) clusters, extremely massive (and rare) galaxies up to moderate redshift (z 1-2) and study their spatial distribution
  • A medium box (100 Mpc/h) to cover intermediate redshifts and the mass assembly of Lyman Break Galaxies at z 3-4, linking them to their local descendents
  • A small box (20 Mpc/h) to tackle high redshift proto-galaxies (z 20) and their impact on the reionization of the Universe

As discussed, the baryon physics to be implemented in each of these runs will be different: simple adiabatic hydrodynamics for the large box; atomic cooling, UV background flux and standard star formation and feedback recipes for the medium box; molecular cooling and post-processing radiative transfer for the small box.