Hi all, Is there a problem when accessing/writing to global variable in using doSNOW package on multiple cores?
In the below program, each of the MyCalculations(ii) writes to the ii-th column of the matrix "globalVariable"... Do you think the result will be correct? Will there be hidden catches? Thanks a lot! p.s. I have to write out to the global variable because this is a simplied example, in fact I have lots of outputs that need to be transported from within the parallel loops... therefore, probably the only way is to write out to global variables... library(doSNOW) MaxSearchSpace=44*5 globalVariable=matrix(0, 10000, MaxSearchSpace) cl<-makeCluster(7) registerDoSNOW(cl) foreach (ii = 2:nMaxSearchSpace, .combine=cbind, .verbose=F) %dopar% { MyCalculations(ii) } stopCluster(cl) [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.