hpc

11 Million CPU hours

hpc
Yesterday we received our 50th citation and this morning the HPC clusters exceeded 11 million CPU hours since the commencement of the HPC initiative at ICTS. 5 Years ago almost to the day the first UCT researcher submitted jobs to…
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Parallel Octave

application, hpc, programming
We’ve tested the parallel package for Octave and it seems to work fairly well. To install this in your local folder run Octave and type: pkg install -verbose -local -forge struct pkg install -verbose -local -forge parallel pkg list Package…
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Octave

application, hpc, programming
We have installed GNU Octave on our clusters. From their website: “GNU Octave is a high-level interpreted language, primarily intended for numerical computations. It provides capabilities for the numerical solution of linear and nonlinear problems, and for performing other numerical …
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Core reservation in PBS

application, hpc, Memory, torque
Researchers who bother to read the Acceptable Usage Policy may have noticed there is a clause which states: Users must abide by the ratio of 2GB of RAM (memory) per allocated core. Usage of the pmem directive should also be…
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10 million CPU hours

hpc
This weekend we passed the 10,000,000 CPU hours mark. This is the sum total of CPU hours of all clusters our users have run jobs on since 2010: Roughly the equivalent of running a single core computer for 416,000 days…
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High Memory Nodes

hardware, hpc, Memory
We have installed two high memory DELL R820 servers into the 800 series. Each server has four sockets with six cores of 2.4GHz each. There are also thirty two 32GB DIMMS making up 1TB of RAM, although these memory chips …
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Say hello to HAL

hpc, SLURM
Over the past few months we’ve been referring to a new type of scheduler that we’ve been testing. We decided to move away from PBS as MAUI is no longer being maintained. The scheduler we have selected, SLURM, is …
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MPI affinity

hpc, maui, MPI, SLURM, torque
MPI socket vs core affinity When running a MPI job you can bind your threads to either a socket or to individual cores. There is no one best solution, the choice depends completely on your task and the way it…
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Berkeley Lab Checkpoint/Restart

hpc, SLURM
Berkeley Lab Checkpoint/Restart has been installed on the SLURM cluster. This allows users to checkpoint a job, cancel it and then resume the job at a later date. The executable is started with the cr_run wrapper: cr_run /home/andy/ram.pl >> /home/andy/ramtest.out…
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