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Re: [Condor-users] condor performance on quad core vs dual core machines
- Date: Thu, 4 Dec 2008 22:51:58 -0500
- From: Ian Chesal <ICHESAL@xxxxxxxxxx>
- Subject: Re: [Condor-users] condor performance on quad core vs dual core machines
Is your application CPU bound or does it use other resources (disk, memory, network)? Sounds like it's not CPU bound. If your application is not CPU bound
you're going to see poorer performance on a box with higher density cores running a job per core because there's more contention for disk and memory and network resources. On your dual core box you have at most two threads active vyying for these resources.
On your 8 core box you have 8 threads, same number of disks and memory interfaces.
I have a performance question. Currently, I am using two clusters to execute my DAGs on.
On the first cluster, each machine has a two dual core CPU, whilst a machine on the second cluster has a two quad core CPU.
I run the same DAG on each cluster while there are equal number of cores available on both. For example, 8 unclaimed cores (2 machines) on cluster #1 and 8 unclaimed cores (1 machine) on cluster #2.
Interestingly, almost always I got better result on the dual core machines cluster!
These are the rest of particulars:
2 Dual Core
CPU: Xeon 3GHz
Condor Version: 6.8.0
Globus version: 4.0.4
2 Quad Core
CPU: Xeon 3GHz
OS: Red Hat Enterprise Linux Server release 5.1
OCS Version: Kusu 5 (build 1619)
Globus version: 4.2.1
P.S. All the above said are with the assumption that condor uses multi cores not single core in case of their availability.
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