1 ILDG Status in Japan  Lattice QCD Archive(LQA) a gateway to ILDG Japan Grid  HEPNet-J/sc an infrastructure for Japan Lattice QCD Grid A. Ukawa Center for Computational Sciences University of Tsukuba

2 LQA Overview  stores gauge configurations and makes them available to lattice community world-wide  Open since February 2004/maintained by CCS  will be a Japan site of ILDG  configurations CP-PACS Nf=2 configurations already available CP-PACS/JLQCD Nf=2+1 configurations in near future  Access policy no authentication requires registration to download acknowledge downloading from LQA (cite relevant papers) when configurations are used for publications

3 CP-PACS/JLQCD Nf=2+1 configurations  RG-improved glue + Clover quark with NP Csw  three lattice spacings a=0.122,0.100,0.07 fm / 10 (Kud,Ks) combinations  6000 – 8000 trajectory/beta,(Kud,Ks)  Will be released 6 months after publication of spectrum/quark mass paper Lattice conference presentation of heavy quarks and eta ’ (effectively Lat ’ 06)  In future, lighter ud quark configurations will be added using PACS-CS

4 LQA details  Architecture a prototype implementation of ILDG standard  XML files still in the old QCDML draft v4.0/conversion to the official version QCDml1.1 is finished/will be implemented soon  file format also based on a previous proposal/conversion to the official v1.0 soon enables interactive search/implementation of middleware Web service standards (when they are ready/approved) user MDC metadata server- side client web browser html WS query Tomcat servlet Xindice

5 LQA search page

6 LQA statistics  Statistics : example of June 2005 Number of registered users 57 Access to the top page 180 (per month) Access to the search page 23 (per month) #configs downloaded 2400 (per month)

7 HEPNet-J/sc Overview  Japanese domestic LQCD network uses SuperSINET peer- to-peer 1Gbps private network connections major LQCD sites in Japan are connected (see figure) enables to construct a dedicated network for LQCD in Japan

8 HEPNet-J/sc Status (1)  Major machines and upgrade plan SR8000/F1 1.2TFlops 24+ Tflops KEK Tsukuba CP-PACS 0.6TFlops PACS-CS 14.3 Tflops Osaka SX-5/128M8 1.3TFlops 24+ Tflops Hiroshima SR TFlops Kyoto SX-5 → 1+TFlops Kanazawa PC-Clusters Tsukuba VPP TFlops (upgrade in a few years) JAMSTEC Earth Simulator 2.7% of 40TFlops (This year) the Nf=2+1 project uses a part of these machines March ‘06 June ‘06 March ‘06 (not QCD dedicate)

9 HEPNet-J/sc Status (2)  shares configurations and other lattice data via file mirroring total 60TB distributed over 6 sites used by several lattice groups in Japan  CP-PACS, JLQCD, QCD-Taro, Kanazawa etc. production and measurement for the Nf=2+1 QCD project utilizes the file sharing very effectively

10 HEPNet-J/sc Future Plan  an issue size of one partition is limited to 1-2 TB, but size of data sets (for one project) easily exceeds the limit. Then, data are distributed over many disks uniform file system based on Grid Technology is required, such as  SRB (Storage Resource Broker)  Gfarm (Grid Data Farm)  will work as a backbone of LQA or ILDG-Japan Grid

11 ILDG related activity  International Lattice Field Theory Network (ILFT Network) USA/UK/Germany/Italy/Japan Bi-annual workshops  3-6 October 2005 at JLAB, USA  8-11 March 2006 in Hayama, Japan Exchange of people This year ’ s Special event : “ Perspectives in Lattice QCD ” A lecture school in Nara, Japan, organized by Y. Kuramashi October 31-November