mattdev1000

Opteron Performance

Discussion created by mattdev1000 on Nov 20, 2009
Latest reply on Nov 20, 2009 by eduardoschardong
Upgrading from 8proc Intel system to 16proc Opteron System yields 30% gain on application

Greetings,

We have a multithreaded .net system that we run at our company.  Our production system are

2x Intel(R) Xeon(R) CPU X5355 @ 2.66GHz (4C; 2.66GHz; 2x 4MB L2; 1.33GHz FSB)16GB

And we're Testing

4x Quad-Core AMD Opteron(tm) Processor 8378 (4C; 2.4GHz; 2GHz IMC; 4x 512kB L2; 6MB L3)128GB

We're noticing that our software only runs about 30% faster on the opteron system even though it carries 8 more cores then the current system.  While I realize there's a lot at play here, we were expecting better performance.

Running Sandra on both systems shows that the inter-core test of the opteron system is actually slower then it's intel counterpart both in bandwidth and latency.  The .Net benchmarks are on the order of 20-40% faster (keep getting different results) on AMD.  Everything else seems materially better on Opteron (CPU/Cache/Memory tests).

We are running Windows 2003 64bit for Intel Based System
We are running Windows 2003 Enterprise 64bit for AMD Based SYstem

SciMark C# implementation shows:

Intel
Composite Score: 198.24 MFlops
FFT            : 114.84 - (1024)
SOR            : 354.37 - (100x100)
Monte Carlo    :  23.99
Sparse MatMult : 208.67 - (N=1000, nz=5000)
LU             : 289.33 - (100x100)

Opteron
Composite Score: 174.33 MFlops
FFT            : 110.32 - (1024)
SOR            : 309.89 - (100x100)
Monte Carlo    :  31.13
Sparse MatMult : 191.54 - (N=1000, nz=5000)
LU             : 228.77 - (100x100)

A few questions:

1) Is anyone experiencing the same with their .Net application?

2) Not ruling out the need to profile our software but want to rule out  hardware issues and/or hardware + os issue.  Are there windows server and/or .net versions built to run optimally on amd?

3) Are there better benchmark software besides sandra, cpuz, scimark to use to compare the systems to help identify potential hardware issues?

TIA

Outcomes