Question #693017 on Yade changed:
https://answers.launchpad.net/yade/+question/693017
Huang peilun posted a new comment:
Thanks Robert, your comments help me a lot.
I now understand the matrix factorization reuse, multithreaded
factorization and GPU accelerated techniques. I still have some problems
about the parallel task management technique.
In the python scripts that your mentioned, I think the parallel task
management technique is implemented through the following code:
#######################################################################
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()],label="iloop"
),
FlowEngine(multithread=1,dead=1,label="flow",ompThreads=10),
GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
triax,
#VTKRecorder(Key=identifier,dead=1, label='vtkRec',
iterPeriod=100,initRun=True,fileName=(outputDir+'/vtkFiles/out-'),recorders=['spheres','facets','boxes']),
newton
]
#Some of the original code is omitted here
if setEnginesParallel:
O.engines=[ParallelEngine([flow,[O.engines[0],O.engines[1],O.engines[2],O.engines[4]]]),
O.engines[5],
O.engines[6]
]
triax = O.engines[1]
newton = O.engines[2]
O.engines[0].slaves[1][0].ompThreads=O.engines[0].slaves[1][1].ompThreads=O.engines[0].slaves[1][2].ompThreads=O.engines[0].slaves[1][3].ompThreads=5
flow.ompThreads=4
#######################################################################
I think based on the above code, FlowEngine runs before the
ForceResetter() which is now the O.engines[0].slaves[1][0]. However, in
this case, the fluid force cannot be applied to the sphere particles.
Did I get this right?
Besides, I noticed that the parallelism in Yade has 3 levels. According
to my understanding, by using the -j/--thread option, one can implement
parallelism inside Engines and parallelism between Computation,
interaction (python, GUI) and rendering. Parallelism inside multiple
engine groups can only be implemented by ParallelEngine. Did I get it
right？
I'm not sure if I should open a new question.
Thanks
Peilun
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