1. Oxana Smirnova (Lund, EPF) 3rd NorduGrid Workshop, May23, 2002
ExTENDED RSL
Oxana Smirnova (Lund, EPF) 3rd NorduGrid Workshop, May23, 2002

2. Globus RSL RSL stands for “Resource Specification Language”
Introduced to communicate job requirements to the Global Resource Allocation Manager (GRAM)
A conjunction of (attribute=value) pairs
GRAM understands a well defined set of attributes
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3. RSL Attributes For GRAM
(executable=string)
Program to run
(directory=string)
Directory in which to run (default is $HOME)
(arguments=arg1 arg2 arg3...)
List of string arguments to program
(stdin=string)
Stdin for program
(stdout=string)
Stdout for program
(stderr=string)
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4. RSL Attributes For GRAM
(maxTime=integer)
Maximum wall clock or cpu runtime (schedulers’s choice) in minutes
(maxWallTime=integer)
Maximum wall clock runtime in minutes
(maxCpuTime=integer)
Maximum CPU runtime in minutes
(maxMemory=integer)
Maximum amount of memory for each process in megabytes
(minMemory=integer)
Minimum amount of memory for each process in megabytes
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5. Flexibility RSL allows basic expressions:
(&(attribute=value1)(attribute=value2))
(|(attribute=value1)(attribute=value2))
operators: <, <=, =, >=, > , !=
Unknown attributes are passed through
May be handled by subsequent tools
globus_rsl: a module for manipulating RSL expressions
Parse an RSL string into a data structure
Functions to manipulate the data structure
Unparse the data structure into a string
Can be used to assist in writing brokers or filters which refine an RSL specification
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6. Making use of it: xRSL
NorduGrid comes with own, innovative Grid Manager and User Interface
User Interface performs the functions of broker
RSL appears to be a very convenient tool
Allows introduction of new attributes
Can be interpreted at different levels, by the UI and the GM
NorduGrid xRSL
Many new attributes
Unused Globus attributes are ignored
User-level xRSL and an internal UI-GM communication level
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7. New attributes, basic job description
(inputFiles=(<file> [<location>])(…))
List of files to be transferred to the computing node from a given location
(outputFiles=(<file> [<location>])(…))
List of files to be preserved after the job completion and retrieved or transferred to a given location
(executables=<file1> <file2> …)
List of files to be given “executable” permissions
(jobName=<string>)
User-defined job name
(notify=<options> < >)
notification on job status change
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8. New attributes, brokering hints
(runTimeEnvironment=<string>)
Application-specific runtime environment (e.g., ATLAS-3.0.1)
(middleware=<string>)
Required middleware (e.g., NorduGrid-1.0.0)
(maxDisk=<number>)
Required disk space
(cluster=<string>)
Specific cluster request
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9. Other new attributes (rerun=<number>)
Number of attempted job re-runs
(ftpThreads=<number>)
Number of GridFTP threads to be used for file transfers
(lifeTime=<number>)
Maximum time for the session directory to remain on the execution node (can not override local policy)
(startTime=<time>)
Specific job start time request
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10. Conclusion: more to come
RSL is a sufficient and convenient way to specify job requirements within the NorduGrid architecture
Detailed description of the NorduGrid xRSL can be found at
For examples of xRSL, see the “Application examples” presentation
As experience shows, more new attributes are still to come, following the user requirements
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