Catalyst2 and grouping output

In Situ Support
1

Hello

I’m using the gridwriter.py sample script to write data out from Catalyst. The issue is as the number of ranks increases, the number of output files also goes up. Is there a way to group data from several ranks to output fewer files, and thus reduce writing out time?

Thanks

2

Hi Pascal,
You can use the AggregateDataset filter for this.

  aggregateDataset1 = AggregateDataset(Input=grid)
  aggregateDataset1.NumberOfTargetProcesses = 8

The NumberOfTargetProcesses is the number of ranks that will write out files.

3

Hi Boonth

Do you just put that in the gridWriter script?

4

No, I took that from another Catalyst 1.0 script. You’ll have to adapt it to your script.

Boonth