1. NGS Innovation Forum, Manchester4 th November 2008 Condor and the NGS John Kewley NGS Support Centre Manager

2. 4 th November 2008NGS Innovation Forum, Manchester Outline What is High Throughput Computing What is Condor? Condor and the NGS

3. 4 th November 2008NGS Innovation Forum, Manchester HPC vs. HTC HPC (High Performance Computing) Large amounts of [simultaneous] computing power for comparatively short periods of time HTC (High Throughput Computing) Large amounts of computing over significantly longer periods, not necessarily all at the same time

4. 4 th November 2008NGS Innovation Forum, Manchester Various job types Parallel Serial Sequential Master-worker Embarrassingly Parallel Parameter Sweep Parameter Search Monte Carlo Parameter Studies MPI PVM OpenMP

5. 4 th November 2008NGS Innovation Forum, Manchester Terminology Parallel Tightly-coupled processes Need synchronisation Information sharing –Message passing –Shared memory 1 process fails, whole job fails Single large homogenous resource Processors used simultaneously Independent Unordered (so not serial/sequential) Nothing embarrassing about it No communication once job starts Might not need all results Could run on different machines with different operating systems.

6. 4 th November 2008NGS Innovation Forum, Manchester A job submission framework which utilises spare computing power Works within a heterogeneous computer network Desktop PCs, Linux workstations, servers, clusters, teaching lab resources can all be included in the Condor pool Uses matchmaking to connect jobs with resources Supports High Throughput Computing (HTC) Developed over the past 20 years at the University of Wisconsin in Madison What is Condor?

7. 4 th November 2008NGS Innovation Forum, Manchester Automatic resubmission when jobs fail Ability to cluster groups of jobs Checkpointing / migration DAGMan - Directed Acyclic Graph / workflow manager Integration with Grid resources, especially through Condor-G Staging and retrieval of data Glide-in – dynamically add Grid worker nodes to your Condor pool Useful Features

8. 4 th November 2008NGS Innovation Forum, Manchester The NGS and Cardiff NGS Partner site since April 05 First resource was a 32 processor SGI cluster (Apr 05) Second resource was the Condor pool (Jun 07) –Over 1000 Windows XP workstations –Mixture of P4s (80%) and C2Ds (20%) –Capped at 200 jobs running concurrently –Used by 10 different numbered accounts –See www.cf.ac.uk/arccawww.cf.ac.uk/arcca Central Manager Submit Nodes Execute Nodes

9. 4 th November 2008NGS Innovation Forum, Manchester Other Condor on the NGS Bristol: ~50 WindowsXP in a Condor pool fronted by a Linux server Reading: ~400 Linux (CoLinux under WindowsXP)

10. 4 th November 2008NGS Innovation Forum, Manchester What is Condor-G? Submit Node Queue Job 1 Job 2 … Remote Site Head Node (Globus) Internet Execute Node Firewall Batch System condor_submit …

11. 4 th November 2008NGS Innovation Forum, Manchester OxGrid: Overview Oxford e-Research Centre Resource Broker/ Login (Condor) Storage (SRB) Microsoft Cluster National Grid Service Cluster BDII, VOMS, SSO CA... Super- computing centre Other University/Institution Condor pool Other University/Institution National Grid Service Resource Department/College Condor pool Departmental Clusters

12. 4 th November 2008NGS Innovation Forum, Manchester NW-GRID cluster (ulgbc3) Condor-G submit host CSD-Physics cluster (ulgbc2) CSD-Physics cluster (ulgbc2) NW-GRID/POL cluster (ulgp4) Condor-G portal CSD AMD cluster (ulgbc1) Condor-G central manager MyProxy server User login Condor ClassAds Globus file staging

13. 4 th November 2008NGS Innovation Forum, Manchester University of Manchester, Research Computing Services 100 cores (an additional 400 in 2 nd pool) Condor used as backfill for the SGE queues IP-tunnelling used to enable connection to the NW- Grid backend nodes from Condor (rather than the provided GCB, the Generic Connection Broker)

14. 4 th November 2008NGS Innovation Forum, Manchester Novel Architecture !? Condor itself is not that new Some NGS users request Windows resources, but most previous NGS nodes used PBS, LSF or SGE on Linux Campus Grids are being developed to harness all available processing power (incl. teaching pools, servers and clusters) Condor can help NGS provide access to Windows resources

15. 4 th November 2008NGS Innovation Forum, Manchester Windows on the NGS Many users are looking for Windows resources on which to run their computations. As well as the resources provided by Cardiff, Bristol and Reading, Southampton have made available a group of 100 processors running under the Windows Compute Cluster Server

16. 4 th November 2008NGS Innovation Forum, Manchester Other work Jean-Alain Grunchec of the University of Edinburgh is trying Condor Glidein to add NGS resources to his condor pool The e-Minerals project utilised a condor submission mechanism to submit jobs to both local Condor pools and Grid resources such as NGS and NW-Grid Both the EGEE resource broker (being trialled by NGS) and Gridway metascheduler are based on Condor technologies STFC Daresbury Laboratory (another NW-Grid site) in collaboration with Cockcroft Centre in setting up a Campus Grid using NW-Grid and Condor resources

17. 4 th November 2008NGS Innovation Forum, Manchester Summary Condor pools can be part of the NGS Condor can be used in many ways with the NGS Being combined with NGS in many Campus Grids Condor can help NGS provide access to Windows resources Information on NGS resources can be found on http://www.grid-support.ac.uk/content/view/239/157/

18. 4 th November 2008NGS Innovation Forum, Manchester Acknowledgements Some slides are based on material from the University of Wisconsin-Madison Condor team. Some of the slides describing the UK university condor work are based on ones they produced themselves (I hope nothing was "lost in translation" ?