Temporary file storage
- Unlike traditional Unix/Linux machines use of shared memory
space /dev/shm is discouraged on Stratus. On Stratus /dev/shm is only a placeholder without any storage space allocated to it.
- All Stratus nodes are equipped with ~2 TB of
Solid State Drive (SSD) that be used for fast
temporary read/write storage space during a job.
- SSD space is available as scratch space only during run time within a job.
- It uses a “btrfs”
filesystem created at start of the job and destroyed at the end. Runtime
location of this temporary scratch storage space is available as environment variable “localscratch”.
Batch scheduler
- Stratus cluster employs a Torque/Moab scheduler system to efficiently and fairly allocating
resources to the user jobs using a queue system.
- Users interested in utilizing the available resources to speed up a large number of independent
serial jobs should use a script/wrapper to pool them a single large job to submit in the queues.
- While one can submit a large number of small independent jobs to the queue, doing so would
impact the priority of their jobs due to scheduler’s use of
fair-share scheduling algorithm.