hpc Archives - Page 23 of 24

Sharing resources with Grid technology

Jan 27, 2011

The screen capture below is a good example of how ICTS's HPC is contributing towards the research community in South Africa through SAGrid. Grid technology, in this instance the gLite middleware, allows portions of an HPC cluster to be…

OpenMPI

Jan 25, 2011

hpc, MPI, programming

Installed openmpi 1.4-4 as well as the MPI development suite on the test cluter. Configured host based authentication to obviate the ssh password authentication. Compiled a test case program. Seeing a 50% speed improvement when splitting the workload over 3…

Comparative shopping

Jan 20, 2011

AWS, hpc

UCT-ICTS offers BL460 dual quad core CPUs with 2.4 GHz Xeon processors. The blades come with either 16 or 32 GB of RAM, fiber channel HBAs and dual NICs. Compared to Amazon each CPU gives approximately 2 EC2 compute units. …

PBS POC upgrade test

Jan 19, 2011

hpc, torque

Tested the upgrade path of Torque from 2.5.3 to 3.0.0. Fairly easy, except one needs to remember a few things:

shut down the pbs daemons before starting.
run torque.setup to sort out the symlinks.
restart the maui daemon.

All seems…

Multi threaded programming and SAGrid CRL error

Jan 12, 2011

hpc, MPI, programming, sagrid

Investigated mixed cluster options with multiple queues for Torque. Brief test of OMP - successful. Started investigating MPI. Fixed an issue with SAGrid: The WMS had lost access to the internet due to a proxy change hence CRL downloads were…

HPC cluster fully utilized

Jan 11, 2011

hpc

Deployed stats and accounting package to Virtual Box test bed. Doesn't work so well as Vbox hides various parameters from net-snmp. Another maths user has joined the UCT HPC cluster and started submitting jobs. Currently the cluster CPUs are 100%…

HPC queue longevity

Jan 10, 2011

hpc, torque

Increased the default research queue (UCTlong) from 2700 to 5400 hours.…

Stats and accounting package for HPC

Jan 6, 2011

hpc

Started writing a stats and accounting package for our HPC cluster, based on perl and utilizing the qstat and momctl commands. The page can be viewed here: http://srvslngrd004.uct.ac.za/

…

Maths jobs submitted to HPC cluster

Jan 4, 2011

application, hpc, MPI

Our first user has started submitting jobs to the cluster. The software being used is auto07p for continuation and bifurcation problems in ordinary differential equations. Auto07 can be compiled with OMP to make it multi-cpu aware. Currently each job makes…

Parallel code, benefits and pit-falls

Dec 15, 2010

hpc, MPI, programming

Most high end platforms for high performance computing are equipped with multi-core CPUs. In order to fully utilize the CPUs multiple jobs must be run on each platform or the code must be changed to utilize multiple CPUs. There are…

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