On Fri, 9 Jun 2023 18:01:44 +0000 akshay kulkarni <akshay...@hotmail.com> wrote:
> > LYG <- pbmclapply(LYGH,FUN = arfima,mc.cores = 2,mc.preschedule = > > FALSE) > | > > | > 0%, ETA NA^ > > It just hangs. My questions from the last time still stand: 0) What is your sessionInfo()? Maybe you're running a parallel BLAS which doesn't always handle fork() or something. It may be worth disabling BLAS-level parallelism as long as you're already trying to use 100% of your processor by other means. 1) What does traceback() show after you interrupt pbmclapply? Most likely, you would be interrupting selectChildren(), but if not, the problem may lie in a very different place from what I'm expecting. 2) While pbmclapply is hung, without interrupting it, take a look at the state of the system and the processes on it (are you still on RHEL? use `top` or whatever task manager you're comfortable with). a) Is 100% of the CPU being used? 100% of one core? Is system mostly idle? b) Can you find the child processes launched by pbmclapply? c) Write down the PID of the child process and attach a debugger to it (If you're on RHEL, try following this guide: <https://beej.us/guide/bggdb/#attach>. If GDB asks you to install additional debug symbols by running debuginfo-install, follow its guidance and then restart GDB.) and obtain a backtrace. (In GDB, the command to obtain a backtrace is "backtrace".) Which function is the child process stuck in? -- Best regards, Ivan ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
