IOSS reader performance issue
We have another performance issue with the IOSS reader. Here is how to replicate.
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The tarball cement_bridge.tar.gz contains two files. One is exampleFile.e, the other is spreader144. Spreader144 will make the dataset.
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Linux
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Create a sandbox directory, and go into it. "source spreader144"
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5.9.1, 16 ranks, Linux.
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Load dataset cement_bridge.e.144.*. Leave all variables not loaded. Time the time from hitting the apply button to when the bridge segment appears. For me, this is about 49 seconds.
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5.10.0, 16 ranks, Linux.
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Load dataset cement_bridge.e.144.*. Turn off block array loads. Time the time from hitting the apply button to when the bridge segment appears. For me, this is about 165 seconds.
This 3X to 4X slowdown is impacting my users.
I will pass the dataset cement_bridge.tar.gz to Utkarsh.