Hello,
I'm trying to run a code that uses the snowfall package. Here is the structure
of my code.
sfInit(parallel=T, cpus = 5, slaveOutfile="ErrorMessage.txt")
sfExportAll()
sfLibrary(rgdal)
sfLibrary(raster)
sfLibrary(sp)
sfLibrary(rgeos)
sfLibrary(snowfall)
system.time( sfClusterApplyLB(1:10, function(k) {
sfCat(paste("Iteration ", k), sep="\n")
if (......) {
} else {
if (class(ob1)=="SpatialCollections") {
ob2 <- ob1@lineobj
} else if (class(ob1)=="SpatialLines") {
ob2 <- ob1
}
ob3 <- data.frame(length_m=sapply(1:length(ob2), function(l) gLength(ob2 [l,
])))
.....
}
.....
}
sfStop()
The problem is that the code returns the error message:
Error in checkForRemoteErrors(val) :
one node produced an error: object 'ob2' not found
>From the debugging function "sfCat", I also get these warning messages:
Warning messages:
1: In searchCommandline(parallel, cpus = cpus, type = type, socketHosts =
socketHosts, :
Unknown option on commandline: --file
2: In searchCommandline(parallel, cpus = cpus, type = type, socketHosts =
socketHosts, :
Unknown option on commandline: MASTER
3: In searchCommandline(parallel, cpus = cpus, type = type, socketHosts =
socketHosts, :
Unknown option on commandline: PORT
4: In searchCommandline(parallel, cpus = cpus, type = type, socketHosts =
socketHosts, :
Unknown option on commandline: OUT
5: In searchCommandline(parallel, cpus = cpus, type = type, socketHosts =
socketHosts, :
Unknown option on commandline: SNOWLIB
socketHosts, :
Unknown option on commandline: SNOWLIB
tion on commandline: SNOWLIB
The code works when I use a simple loop for(k in 1:10) {} instead of
sfClusterApplyLB(1:10, function(k) {}.
Why do I obtain this error message ? I am completely novice in using snowfall
package. So any advices are appreciated.
Thanks a lot for your time.
Marine
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