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July 21, 2009, 05:42 |
trying floatTransfer=1
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#1 |
Senior Member
BastiL
Join Date: Mar 2009
Posts: 530
Rep Power: 20 |
Hi all,
I want to try to switch on floatTransfer for paralle calculations with 1.5-dev. I tried creating ~/.OpenFOAM-1.5-dev/controlDict and set it to 1 there - without effect. Where does the local controlDict have to be placed? ~/.OpenFOAM-1.5-dev/etc/controlDict) ~/OpenFOAM/.OpenFOAM-1.5-dev/controlDict? Is it dependent on Installation location? Thanks. |
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July 21, 2009, 10:22 |
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#3 |
Senior Member
Hua Zen
Join Date: Mar 2009
Posts: 138
Rep Power: 17 |
~/OpenFOAM/OpenFOAM-dev/etc/controlDict
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July 21, 2009, 15:04 |
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#4 |
Senior Member
BastiL
Join Date: Mar 2009
Posts: 530
Rep Power: 20 |
Thanks, I will try this out. Documentation of this is not very accurate.
Regards BastiL |
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July 22, 2009, 03:36 |
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#5 | ||
Senior Member
Mark Olesen
Join Date: Mar 2009
Location: https://olesenm.github.io/
Posts: 1,714
Rep Power: 40 |
Quote:
In some cases it is fine, but for a few particular problems (and perhaps particular decompositions thereof) I think rounding error issues become a problem. In my case, the solution ran well for 800-1000 iter or so and then the hit a very strange spike in the convergence behaviour. Quote:
Code:
//- Search for @em name in the following hierarchy: // -# personal settings: // - ~/.OpenFOAM/\<VERSION\>/ // <em>for version-specific files</em> // - ~/.OpenFOAM/ // <em>for version-independent files</em> // -# site-wide settings: // - $WM_PROJECT_INST_DIR/site/\<VERSION\> // <em>for version-specific files</em> // - $WM_PROJECT_INST_DIR/site/ // <em>for version-independent files</em> // -# shipped settings: // - $WM_PROJECT_DIR/etc/ Note: unlike other dictionaries, do not attempt to use #include or other directives within the controlDict. It is read before these mechanisms are available within OpenFOAM. /mark |
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July 27, 2009, 03:53 |
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#6 |
Senior Member
BastiL
Join Date: Mar 2009
Posts: 530
Rep Power: 20 |
Thanks Mark,
I found this code in src/OpenFOAM/include/OSspecific.H. Do I have to uncomment some of it? And where do I finally have to place my file to? The reason why I would like to try floatTransfer is very poor scaling of OF on our Myrinet-Cluster. It seems there is nearly no speedup between 16 and 64 cores - ths behaviour is completely different to commerical codes. |
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July 27, 2009, 04:01 |
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#7 |
Senior Member
Mark Olesen
Join Date: Mar 2009
Location: https://olesenm.github.io/
Posts: 1,714
Rep Power: 40 |
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July 27, 2009, 04:31 |
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#8 |
Senior Member
BastiL
Join Date: Mar 2009
Posts: 530
Rep Power: 20 |
Thanks. However, that does not seem to be much quicker at all.... I have no idea:
16 Cores: Time = 250 PBiCG: Solving for Ux, Initial residual = 0.000399256, Final residual = 3.3002e-05, No Iterations 2 PBiCG: Solving for Uy, Initial residual = 0.00462622, Final residual = 0.000422648, No Iterations 2 PBiCG: Solving for Uz, Initial residual = 0.00475788, Final residual = 0.000443842, No Iterations 1 GAMG: Solving for p, Initial residual = 0.0483258, Final residual = 0.000298896, No Iterations 3 time step continuity errors : sum local = 0.000588824, global = 1.06764e-05, cumulative = -0.000579853 PBiCG: Solving for epsilon, Initial residual = 4.90512e-05, Final residual = 1.28975e-07, No Iterations 1 bounding epsilon, min: -0.403354 max: 6.75487e+08 average: 41716.5 PBiCG: Solving for k, Initial residual = 5.70964e-05, Final residual = 2.91034e-07, No Iterations 1 ExecutionTime = 26228.3 s ClockTime = 26328 s 64 Cores: Time = 250 PBiCG: Solving for Ux, Initial residual = 0.000395327, Final residual = 1.16597e-05, No Iterations 3 PBiCG: Solving for Uy, Initial residual = 0.00493349, Final residual = 0.000152124, No Iterations 3 PBiCG: Solving for Uz, Initial residual = 0.00514608, Final residual = 0.000143217, No Iterations 3 GAMG: Solving for p, Initial residual = 0.0501587, Final residual = 0.000316504, No Iterations 4 time step continuity errors : sum local = 0.000624036, global = -1.80558e-05, cumulative = -0.00034109 PBiCG: Solving for epsilon, Initial residual = 7.91971e-05, Final residual = 6.22651e-07, No Iterations 1 bounding epsilon, min: -0.42092 max: 1.81212e+09 average: 49460.6 PBiCG: Solving for k, Initial residual = 9.47916e-05, Final residual = 1.49895e-06, No Iterations 1 ExecutionTime = 24337.1 s ClockTime = 24453 s This is a Myrinet CLuster, I use OpenMPI 1.26 as with OF1.5 compiled with mx turned on and I use the --mca mtl Option. Ideas? |
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