1. Alain Roy Computer Sciences Department University of Wisconsin-Madison roy@cs.wisc.edu http://www.cs.wisc.edu/condor ClassAds: Present and Future

2. www.cs.wisc.edu/condor What Are ClassAds? › A ClassAd maps attributes to expressions › Expressions  Constants: strings, numbers, etc.  Expressions: other.Memory > 600M  Lists: { “roy”, “pfc”, “melski” }  Other ClassAds › Powerful tool for grid computing  Semi-structured (you pick your structure)  Matchmaking

3. www.cs.wisc.edu/condor ClassAd Example [ Type = “Job”; Owner = “roy”; Universe = “Standard”; Requirements = (other.OpSys == “Linux” && other.DiskSpace > 140M); Rank = (other.DiskSpace > 300M ? 10 : 1); ClusterID = 12314; JobID = 0; Env = “”; … ] (To see a real ClassAd, try: condor_q –l or condor_status –l )

4. www.cs.wisc.edu/condor ClassAd Matchmaking [ Type = “Job”; Owner = “roy”; Requirements = (other.OpSys == “Linux” && other.DiskSpace > 140M); Rank = (other.DiskSpace > 300M ? 10 : 1); ] [ Type = “Machine”; OpSys = “Linux”; DiskSpace = 500M; AllowedUsers = {“roy”, “melski”, “pfc”}; Requirements = (IsMember(other.Owner, AllowedUsers); ]

5. www.cs.wisc.edu/condor ClassAds Are Open Source › Library GNU Public License (LGPL) › Complete source code included  Library code  Test program › Available from: http://www.cs.wisc.edu/condor/classad › Version 0.9.3

6. www.cs.wisc.edu/condor Who Uses ClassAds? › Condor › European Data Grid › NeST › Web site › …You?

7. www.cs.wisc.edu/condor ClassAd User: Condor › ClassAds describe jobs and machines › Matchmaking figures out what jobs run on which machines › DAGMan will soon internally represent DAGs as ClassAds

8. www.cs.wisc.edu/condor ClassAd User: EU Datagrid › JDL: ClassAd schema to describe jobs/machines › ResourceBroker: matches jobs to machines

9. www.cs.wisc.edu/condor ClassAd User: NeST › NeST is a storage appliance › NeST uses ClassAd collections for persistent storage of:  User Information  File meta-data  Disk Information  Lots (storage space allocations)

10. www.cs.wisc.edu/condor ClassAd User: Web Site › Web-based application in Germany › User actions (transitions) are constrained › Constraints expressed through ClassAds

11. www.cs.wisc.edu/condor What’s New? › ClassAd collections › XML representation

12. www.cs.wisc.edu/condor New: ClassAd Collections › A collection is a “bag” of ClassAds › Can have views on a collection:  Sub view: contains ClassAds matching a constraint, like (memory > 300M)  Partition view: contains sub view for each value of a constraint

13. www.cs.wisc.edu/condor Collection Views Root View (all machine ClassAds)OpSys == “Linux”Memory > 600MOwner: royOwner: pfcOwner: ned

14. www.cs.wisc.edu/condor New: XML Representation › Does not replace original representation › Sample: Job Roy (other.Memory > 600M)

15. www.cs.wisc.edu/condor What’s Coming? › 1.0—real soon now  Smoothing out minor issues  Updated documentation › After 1.0  Set-extensions (with University of Chicago)  Gang-matching, indexing  Recoverable transmission of ClassAds (two- phase commit)  Access from multiple languages (SWIG)

16. www.cs.wisc.edu/condor Cool! Tell Me More! Q&A: 9:00am-noon, Wed., Room 3393 http://www.cs.wisc.edu/condor/classad condor-admin@cs.wisc.edu ClassAd users mailing list