How can I `print` or `cat` when using parallel

Question

If I call a function using parSapply then print, message or cat statements inside that function don\'t seem to output to

Answer 1

Using outfile param in makeCluster you can redirect the output to a file and then check that file to see how your program progresses.

Interestingly on a Linux machine setting it to "" outputs to the console, but that doesn't work for me on a Windows machine. File output works on both.

Answer 2

I am using makeCluster with outfile on Windows with doParallel package version 1.0.8. I'm able to tail outfile using a simple Powershell command powershell Get-Content c:/path/to/log/mylog.txt -wait. Works for me.