[h5py] 273/455: Fix slowdown with row-oriented selection

[Ghislain Vaillant]

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ghisvail-guest pushed a commit to annotated tag 1.3.0
in repository h5py.

commit ca153dd249e243eb364a366df1054c965cc0624a
Author: andrewcollette <andrew.collette at gmail.com>
Date:   Tue Jun 9 22:05:28 2009 +0000

    Fix slowdown with row-oriented selection
---
 h5py/highlevel.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/h5py/highlevel.py b/h5py/highlevel.py
index e5de0c9..eb9ec41 100644
--- a/h5py/highlevel.py
+++ b/h5py/highlevel.py
@@ -1031,7 +1031,13 @@ class Dataset(HLObject):
                 val = val2
             
             # Perform the write, with broadcasting
-            mspace = h5s.create_simple(mshape, (h5s.UNLIMITED,)*len(mshape))
+            # Be careful to pad memory shape with ones to avoid HDF5 chunking
+            # glitch, which kicks in for mismatched memory/file selections
+            if(len(mshape) < len(self.shape)):
+                mshape_pad = (1,)*(len(self.shape)-len(mshape)) + mshape
+            else:
+                mshape_pad = mshape
+            mspace = h5s.create_simple(mshape_pad, (h5s.UNLIMITED,)*len(mshape_pad))
             for fspace in selection.broadcast(mshape):
                 self.id.write(mspace, fspace, val, mtype)
 

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