These variables provide default values for most functions in the package.
The environment .pbd_env contains several objects with parameters for
communicators and methods.
Wei-Chen Chen wccsnow@gmail.com, George Ostrouchov, Drew Schmidt, Pragneshkumar Patel, and Hao Yu.
The elements of .pbd_env$SPMD.CT are default values for various
controls
| Elements | Default | Meaning |
comm | 0L | communicator index |
intercomm | 2L | inter communicator index |
info | 0L | info index |
newcomm | 1L | new communicator index |
op | "sum" | the operation |
port.name | "spmdport" | the operation |
print.all.rank | FALSE | whether all ranks print message |
print.quiet | FALSE | whether rank is added to print/cat |
rank.root | 0L | the rank of root |
rank.source | 0L | the rank of source |
rank.dest | 1L | the rank of destination |
request | 0L | the request index |
serv.name | "spmdserv" | the service name |
status | 0L | the status index |
tag | 0L | the tag number |
unlist | FALSE | whether to unlist a return |
divide.method | "block" | default method for jid |
mpi.finalize | TRUE | shutdown MPI on finalize() |
quit | TRUE | quit when errors occur |
msg.flush | TRUE | flush each comm.cat/comm.print |
msg.barrier | TRUE | include barrier in comm.cat/comm.print |
Rprof.all.rank | FALSE | call Rprof on all ranks |
lazy.check | TRUE | use lazy check on all ranks |
The elements of .pbd_env$SPMD.OP list the implemented operations for
reduce() and allreduce(). Currently, implemented operations are
"sum", "prod", "max", "min", "land", "band", "lor", "bor", "lxor", "bxor".
The elements of .SPMD.IO are default values for functions in
comm_read.r and comm_balance.r.
| Elements | Default | Meaning |
max.read.size | 5.2e6 | max of reading size (5 MB) |
max.test.lines | 500 | max of testing lines |
read.method | "gbd" | default reading method |
balance.method | "block" | default load balance method |
where balance.method is only used for "gbd" reading method when
nrows = -1 and skip = 0 are set.
The elements of .pbd_env$SPMD.TP are default values for
task pull settings
| Elements | Default | Meaning |
bcast | FALSE | whether to bcast() objects to all ranks |
barrier | TRUE | if call barrier() for all ranks |
try | TRUE | if use try() in works |
try.silent | FALSE | if silent the try() message |
Programming with Big Data in R Website: https://pbdr.org/