[yt-svn] commit/yt: xarthisius: Fix documentation for MosaicFisheyeCamera. Fix logic governing mpi procs division among computational patches

[Bitbucket]

1 new commit in yt:


https://bitbucket.org/yt_analysis/yt/changeset/98e269561222/
changeset:   98e269561222
branch:      yt
user:        xarthisius
date:        2012-01-19 13:51:52
summary:     Fix documentation for MosaicFisheyeCamera. Fix logic governing mpi procs division among computational patches
affected #:  1 file

diff -r 8bf3fafb70d17df4a77564fd6ae9a4224aec325b -r 98e269561222ebfaee42c5f38df792204d4b1f03 yt/visualization/volume_rendering/camera.py
--- a/yt/visualization/volume_rendering/camera.py
+++ b/yt/visualization/volume_rendering/camera.py
@@ -965,7 +965,7 @@
         >>>         transfer_function = tf, 
         >>>         sub_samples = 5, 
         >>>         pf=pf, 
-        >>>         nimx=2,nimy=2,procs_per_wg=4)
+        >>>         nimx=2,nimy=2,procs_per_wg=2)
         
         # Take a snapshot
         >>> im = cam.snapshot()
@@ -977,8 +977,16 @@
 
         ParallelAnalysisInterface.__init__(self)
         PP = ProcessorPool()
+        npatches = nimy*nimx
         if procs_per_wg is None:
-            procs_per_wg = PP.size
+            if (PP.size % npatches):
+                raise RuntimeError("Cannot evenly divide %i procs to %i patches" % (PP.size,npatches))
+            else:
+                procs_per_wg = PP.size / npatches
+        else:
+            if (PP.size != npatches*procs_per_wg):
+               raise RuntimeError("You need %i processors to utilize %i procs per one patch in [%i,%i] grid" 
+                     % (npatches*procs_per_wg,procs_per_wg,nimx,nimy))
         for j in range(nimy):
             for i in range(nimx):
                 PP.add_workgroup(size=procs_per_wg, name='%04i_%04i'%(i,j))

Repository URL: https://bitbucket.org/yt_analysis/yt/

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