High Performance Computing encompasses using "supercomputers" with high numbers of CPUs, large storage systems and advanced networks to do time-consuming calculations. Parallel algorithms and parallelization of storage are essential to this field, as well as issues with complex, fast networks.

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HPC 2008 Time Share Single Core (Fractional Resource Scheduling)

Windows HPC 2008 appears to be restricted to one task per core. Is there anyway to time share multiple tasks (or jobs) over a single core?
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Windows HPC Server 2008: private network across VMs?

Windows HPC Server 2008 provides the option to automatically deploy OS images to new cluster node, using Windows Deployment Services. However, this requires the HPC cluster to be set up with a ...
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NFS denies mount, even though the client is listed in exports

We have a couple of servers (part of an HPC cluster) in which we're currently seeing some NFS behavior which is not making sense to me. node1 exports its /lscratch directory via NFS to node2, mounted ...
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Open MPI can't launch remote nodes via SSH

I am trying to set up Open MPI between a few machines on out network. Open MPI works fine locally, but I just can't get it to work on a remote node. I can ssh into the remote machine (without ...
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Numerous pbs_server errors in /var/log/messages

On supercomputer's management node we receive numerous errors such as: pbs_server: LOG_ERROR::is_request, bad attempt to connect from 10.10.0.254:1023 (address not trusted - check entry in ...
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Windows HPC Server 2008 R2 SP3 upgrade

It's not clear to me from reading the documentation if I must update the clients, or whether I can just update the head node and compute nodes. Does anyone have any experience of this? I don't want ...
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Parallel filesystem which schedules simultaneous file requests to mutually exclusive sets of OSSs

My environment is RHEL based, interconnect is infiniband. I have some experience with Lustre. What i want to know is: Is there a parallel file-system, where if simultaneous write request arrive, ...
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HPC / EC2 - optimizing NFS for relialibility

In AWS-EC2, I've set-up a cluster of linux virtual machines made of an NFS fileserver and many clients. If the number of clients is above ~20, under heavy I/O, I am experiencing loss of file ...
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Programs running in an NX session seem to pause when session disconnects

We are currently running an interactive HPC application which presents a graphical interface to the user, attaches to an HPC cluster and allows them to run and observe some computation. The user logs ...
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Job's dependency on Windows HPC Cluster Manager

I'm using Microsoft HPC 2008 R2 Cluster Manager and I need to add dependency between several jobs (the second jobs can't run while the first one is still running) but I found out that Microsoft has ...
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291 views

How should I run HPC Challenge benchmark on Ubuntu?

I've found a package on Ubuntu, http://packages.ubuntu.com/precise/hpcc. An older version of it reads as description: "The High Performance Computing (HPC) Challenge benchmark runs a suite of 7 ...
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Windows Azure HPC Scheduler Architecture

So far I've found very little information on the scheduling policy, resource management policy of Azure HPC Scheduler. I would appreciate any kind of information regarding some of these questions: ...
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GlusterFS distributed setup for 32 disks on 32 machines

I have 32 machines with identical disks (500G): they have two partitions, one for the OS (Debian 7) in ext4 (16G), and a XFS partition which covers the rest of the disk. They're connected through ...
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Setting up computational cluster using infiniband fails

My task: I need to assemble computational cluster, consists of two nodes using infiniband technology. When I try to start mpirun ... for two nodes, the process hangs. If i try to use flag ...
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Microsoft HPC: mixing windows and linux blades

I have a working Windows HPC cluster with 32 blades, all of them are using Windows HPC. My question is: can I install Linux on 16 blades and keep the other 16 on Windows? Is there a specific version ...
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Job run-time variations on dual socket computer

I'm running scientific software (WRF-NMM, atmosphere simulation, weather prediction). On all computers I used it, job running times of run cycles were consistent. All those machines were one socket, ...
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Automatically offline bad nodes in Windows HPC?

Is there any way, in Windows 2008 HPC, to automatically mark nodes offline if jobs are consistently failing on those nodes?
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Lustre I/O server goes down without cpu being loaded, I/O server which takes the backup service goes 100% cpu and performance goes down.

I'm having something that I can not understand. I quite new on lustre. n4 and n5 are two I/O servers, each one taking care of different datasets. When one of them goes down, the other is supposed to ...