parallel::detectCores(TRUE) gives: Error in system(cmd, TRUE) : error in running command
There is no /usr/sbin/sysctl on my Ubuntu 12.04 machine. There is a /sbin/sysctl, but it does not accept the '-n hw.ncpu' arguments. Its /usr/bin/nproc [-all] will tell the number of available [installed] processing units and 'cat /proc/cpuinfo | grep processor | wc -l' will also give the number of installed processing units. Bill Dunlap TIBCO Software wdunlap tibco.com On Fri, Aug 22, 2014 at 3:17 PM, Marius Hofert
<marius.hofert at uwaterloo.ca> wrote:
Thanks, Bill. The output is:
trace(system, quote(print(command)))
parallel::detectCores(TRUE) Tracing function "system" in package "base" [1] "system"
Tracing system(cmd, TRUE) on entry [1] "/usr/sbin/sysctl -n hw.ncpu 2>/dev/null" Error in system(cmd, TRUE) : error in running command
On Fri, Aug 22, 2014 at 6:13 PM, William Dunlap <wdunlap at tibco.com> wrote:
The same is true in R-2.14.1 on Ubuntu 12.04.4 LTS . Put a trace on system with trace(system, quote(print(command))) parallel::detectCores(TRUE) and you will see the offending shell command. Bill Dunlap TIBCO Software wdunlap tibco.com On Fri, Aug 22, 2014 at 1:03 PM, Marius Hofert <marius.hofert at uwaterloo.ca> wrote:
Hi, Both under the current R-devel (r66456) and a version from about 3 months ago, I experience the following behavior:
parallel::detectCores(TRUE)
Error in system(cmd, TRUE) : error in running command
traceback()
3: system(cmd, TRUE)
2: gsub("^ +", "", system(cmd, TRUE)[1])
1: parallel::detectCores(TRUE)
This is on Ubuntu 14.04. Does anybody else see this? [I currently have quite a heavy workload, otherwise I would have installed and tested it also under 3.1.1] Cheers, Marius
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