Search Results

User Name Remember Me Password

Showing results 1 to 10 of 10 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX June 25, 2012, 19:01

Replies: 28 using core i7 cpu for parallel solving Views: 11,029 Posted By ghorrocks When CPUs run hard they run hot. Well designed... When CPUs run hard they run hot. Well designed systems can handle the load and should still function fine. Poorly designed systems will overheat and cause problems - I think the i7 chips sense their...

Forum: CFX September 8, 2011, 07:51

Replies: 28 using core i7 cpu for parallel solving Views: 11,029 Posted By ghorrocks If the benchmark problem runs at a similar speed... If the benchmark problem runs at a similar speed then you definitely have a problem with your set up, it is not the simulation. Recent Intel CPUs do run a higher clock speed when running single...

Forum: CFX September 5, 2011, 18:47

Replies: 28 using core i7 cpu for parallel solving Views: 11,029 Posted By ghorrocks I see. Forget about the 7 processes model, you... I see. Forget about the 7 processes model, you are always going to get terrible speedups with hyperthreading. A speedup of 1.86 at 4 processes is not very good. You should be over 3 for modern...

Forum: CFX September 4, 2011, 20:11

Replies: 28 using core i7 cpu for parallel solving Views: 11,029 Posted By ghorrocks I do not trust your measurement yet. Please... I do not trust your measurement yet. Please recalculate based on CFD Solver wall clock seconds reported immediately after the iterations are complete.

Forum: CFX September 2, 2011, 06:44

Replies: 28 using core i7 cpu for parallel solving Views: 11,029 Posted By ghorrocks OK, but it is easier to use the time recorded in... OK, but it is easier to use the time recorded in the output fine. Then you don't need to watch text files scroll past. More accurate too.

Forum: CFX September 1, 2011, 21:44

Replies: 28 using core i7 cpu for parallel solving Views: 11,029 Posted By ghorrocks What time are you reporting? The setup and shut... What time are you reporting? The setup and shut down of a simulation does not scale with multi processors, only the solver time. If you look in the output file the solver time is reported after the...

Forum: CFX August 31, 2011, 18:28

Replies: 28 using core i7 cpu for parallel solving Views: 11,029 Posted By ghorrocks CFX has not been compiled to make use of... CFX has not been compiled to make use of hyperthreading. On or off it will not make much difference. My question about memory is because a possible explanation of the poor performance is you have...

Forum: CFX August 31, 2011, 06:53

Replies: 28 using core i7 cpu for parallel solving Views: 11,029 Posted By ghorrocks I assume you have a 4 core CPU - in that case the... I assume you have a 4 core CPU - in that case the 4 core result will be close enough to the no-hyperthreading result. A speedup factor of 2 at 4 cores on a modern CPU is not very good. You should...

Forum: CFX August 10, 2011, 06:03

Replies: 28 using core i7 cpu for parallel solving Views: 11,029 Posted By ghorrocks Do the test yourself then! Run a benchmark case... Do the test yourself then! Run a benchmark case with 4 processes and another with 8. I bet the 8 case is either barely faster than the 4, or more likely to be slower.

Forum: CFX January 30, 2010, 05:31

Replies: 28 using core i7 cpu for parallel solving Views: 11,029 Posted By ghorrocks Installation of parallel licenses is discussed in... Installation of parallel licenses is discussed in the CFX manual. If you currently have 4 parallel licenses but wish to waste money by running 8 processes on a single i7 CPU then talk to your CFX rep...

Showing results 1 to 10 of 10

Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home General Forums     Main CFD Forum     System Analysis     Structural Mechanics     Electromagnetics     CFD Freelancers     Hardware     Lounge Software User Forums     ANSYS         CFX         FLUENT             Fluent Multiphase             Fluent UDF and Scheme Programming         ANSYS Meshing & Geometry     Autodesk Simulation CFD     AVL FIRE     COMSOL     CONVERGE     Fidelity CFD     FloEFD, FloWorks & FloTHERM     FLOW-3D     OpenFOAM         OpenFOAM News & Announcements             OpenFOAM Announcements from ESI-OpenCFD             OpenFOAM Announcements from OpenFOAM Foundation             OpenFOAM Announcements from Other Sources         OpenFOAM Installation         OpenFOAM Meshing & Mesh Conversion         OpenFOAM Pre-Processing         OpenFOAM Running, Solving & CFD         OpenFOAM Post-Processing         OpenFOAM Programming & Development         OpenFOAM Verification & Validation         OpenFOAM Community Contributions             OpenFOAM CC Toolkits for Fluid-Structure Interaction         OpenFOAM Journal         OpenFOAM Bugs     Phoenics     REEF3D         REEF3D News & Announcements     Siemens         STAR-CCM+         STAR-CD     SU2         SU2 News & Announcements         SU2 Installation         SU2 Shape Design Mesh Generation & Pre-Processing Software     ANSA     enGrid     GridPro     Pointwise & Gridgen Visualization & Post-Processing Software     EnSight     FieldView     ParaView     Tecplot Special Topics     Mesh Generation & Pre-Processing     Visualization & Post-Processing CFD Online Community     Site News & Announcements     Site Help, Feedback & Discussions     CFD-Wiki