On Wed, 2011-08-17 at 04:50 -0700, Tim Triche, Jr. wrote: > I'll see if I can put together a self-contained example. Primarily, > the times that I use multicore (and attempted to use doSMP, mostly > because one of my users refuses to ditch Windows) are when I am > reading a ton of binary files, none of which depend on the others. > This is a blindingly obvious use-case for e.g. doMC and doSMP, yet > what typically happens is that the entire operation wedges. I'm told > that doSMP really only works well with Revolution R, but per above, I > will try to put together a working self-contained example to show > how.
Remember that physical I/O can bind up the processes too. Having a bunch of processes all trying to read from local disk at the same time (especially when they are all trying to read the same file(s), a problem it seems you may not have) is a recipe for I/O locks that can seize up your processes. So, if the problem only occurs with physical I/O, the first thing I would try is to move that storage to a storage device on another machine that is tuned for that level of disk I/O. Regards, - Brian -- Brian G. Peterson http://braverock.com/brian/ Ph: 773-459-4973 IM: bgpbraverock ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
