Description Usage Arguments Details Value Examples
Grabs the existing BLACS context grid information.
1 2 3 | base.pnum(ICTXT, PROW, PCOL)
base.pcoord(ICTXT, PNUM)
|
ICTXT |
BLACS context number. |
PROW, PCOL |
BLACS grid location row/column |
PNUM |
process rank |
For advanced users only. These functions are simple recreations of the BLACS
routines BLACS_PNUM
and BLACS_PCOORD
. The former gets the
process number associated with the BLACS process grid location
c(MYPROW, MYPCOL)
, while the latter does the reverse.
pnum
returns an integer; pcoord
returns a list
containing elements PROW
and PCOL
.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | spmd.code <- "
suppressMessages(library(pbdMPI))
suppressMessages(library(pbdBASE))
init.grid()
### get the ICTXT = 0 BLACS coordsinates for process 3
myCoords <- base.pcoord(ICTXT = 0, PNUM = 3)
comm.print(myCoords)
### get the ICTXT = 1 BLACS coordsinates for process 3
myCoords <- base.pcoord(ICTXT = 1, PNUM = 3)
comm.print(myCoords)
### get the ICTXT = 2 BLACS coordsinates for process 3
myCoords <- base.pcoord(ICTXT = 2, PNUM = 3)
comm.print(myCoords)
finalize()
"
pbdMPI::execmpi(spmd.code = spmd.code, nranks = 4L)
|
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