Is calling R script thread-safe in MPI context? - Gretl-users - gretlml.univpm.it

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Is calling R script thread-safe in MPI context?

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Marcin Błażejowski

Monday, 24 January 2022 Mon, 24 Jan '22

3:45 p.m.

Hi, suppose I have a R code which load gretldata via '--send-data' flag and stores the results RES via 'gretl.export(RES, base)' and 'base' is $mpirank based string. Is this thread-safe? Marcin -- Marcin Błażejowski

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Sven Schreiber

Monday, 24 January Mon, 24 Jan

5:18 p.m.

Am 24.01.2022 um 16:45 schrieb Marcin Błażejowski:

Hi, suppose I have a R code which load gretldata via '--send-data' flag and stores the results RES via 'gretl.export(RES, base)' and 'base' is $mpirank based string. Is this thread-safe?

Hi Marcin, I believe it would be. Assuming that gretl.export from the R side produces temp files, I think the most problematic part would be to make sure that those temp files are not mixed up across ranks (threads). So if those files are named according to the MPI rank and only that rank them picks them up, I'd say it should work in theory. cheers sven

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Marcin Błażejowski

6:08 p.m.

On 24.01.2022 18:18, Sven Schreiber wrote:

Am 24.01.2022 um 16:45 schrieb Marcin Błażejowski: > Hi, > > suppose I have a R code which load gretldata via '--send-data' flag > and stores the results RES via 'gretl.export(RES, base)' and 'base' is > $mpirank based string. Is this thread-safe? > Hi Marcin, I believe it would be. Assuming that gretl.export from the R

Hi Sven, yes, but what worries me here is not gretl.export() but --send-data (all nodes work on different data). Marcin -- Marcin Błażejowski

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Sven Schreiber

9:55 p.m.

Am 24.01.2022 um 19:08 schrieb Marcin Błażejowski:

On 24.01.2022 18:18, Sven Schreiber wrote: > Am 24.01.2022 um 16:45 schrieb Marcin Błażejowski: >> Hi, >> >> suppose I have a R code which load gretldata via '--send-data' flag >> and stores the results RES via 'gretl.export(RES, base)' and 'base' is >> $mpirank based string. Is this thread-safe? >> > Hi Marcin, I believe it would be. Assuming that gretl.export from the R Hi Sven, yes, but what worries me here is not gretl.export() but --send-data (all nodes work on different data).

I would expect it to work, because each gretl MPI-based process would invoke its separate R instance. At least that's my understanding. cheers sven

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Marcin Błażejowski
Sven Schreiber