# What's New

## Index

- SLURM Version 2.1, January 2010
- SLURM Version 2.2, available in late 2010
- SLURM Version 2.3, available in 2011
- SLURM Version 2.4 and beyond

## Major Updates in SLURM Version 2.1

SLURM Version 2.1 was released in January 2010. Major enhancements include:

- Optimized resource allocation based upon network topology (e.g. hierarchical switches).
- Support for job preemption based upon job Quality of Service (QOS) in addition to queue priority.
- Support for time limits on individual job steps (in addition to the job time limit).
- Improve fault-tolerance in recognizing compute node reboots.
- Add sinfo and squeue information about specific cores allocated.
- Support for Solaris (OpenSolaris build 119).

## Major Updates in SLURM Version 2.2

SLURM Version 2.2 release is planned late in 2010. Major enhancements include:

- Permit resource allocations (jobs) to shrink in size.
- Add support for job time limit range. The job's time limit will get it's maximum time limit unless reducing it to a lower value within the range will permit it to start earlier via backfill scheduling.
- Add support for allocation of generic resources (e.g. GPUs).
- Add a job submission plugin that can be use to set site-specific default job parameters including default partition (based upon job size, etc.).
- Add support for TotalView partitial attach (debugger attach to selected tasks only).
- Add support for draining partitions (job queues) with alternate partition specification available.
- The MySQL database has been restructured for a 50-75% performance improvement.
- RPCs have been modified to prevent job loss on SLURM upgrades and permit different versions of the commands and deamons to interoperate.
- Major enhancements made to PostGreSQL database plugin (still beta).
- Permit SLURM commands to operate between clusters (e.g. status jobs on a different cluster or submit a job on one cluster to run on another).
- Major enhancements for high-throughput computing. Job throughput rates now exceed 120,000 jobs per hour with bursts of job submissions at several times that rate.

## Major Updates in SLURM Version 2.3

SLURM Version 2.3 release is planned in 2011. Major enhancements currently planned include:

- Support for Cray computers (integration with ALPS/BASIL).
- Support for BlueGene/Q computers.
- Integration with FlexLM license management.
- Numerous enhancements to advanced resource reservations.

## Major Updates in SLURM Version 2.4 and beyond

Detailed plans for release dates and contents of additional SLURM releases have not been finalized. Anyone desiring to perform SLURM development should notify slurm-dev@lists.llnl.gov to coordinate activities. Future development plans includes:

- Add Kerberos credential support including credential forwarding and refresh.
- Provide a web-based SLURM administration tool.

Last modified 31 August 2010