From marius.hofert at uwaterloo.ca  Sat Aug 23 00:17:25 2014
From: marius.hofert at uwaterloo.ca (Marius Hofert)
Date: Fri, 22 Aug 2014 18:17:25 -0400
Subject: [Rd] parallel::detectCores(TRUE) gives: Error in system(cmd,
 TRUE) : error in running command
In-Reply-To: <51eca682339a4cb5b14cc327e37ff02a@CONNHUB4.connect.uwaterloo.ca>
References: <CAM3-KjZ2OtUx6Hz88WuM4A4AV8_OAey4MvWjz8ZKMRDQi=jgdQ@mail.gmail.com>
	<51eca682339a4cb5b14cc327e37ff02a@CONNHUB4.connect.uwaterloo.ca>
Message-ID: <CAM3-Kjb-E2U=SaTigq7D-SBhG_ox=R8o-c9ZgwqpvspKweOEEw@mail.gmail.com>

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
>>
>> ______________________________________________
>> R-devel at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel



[Rd] parallel::detectCores(TRUE) gives: Error in system(cmd, TRUE) : error in running command
Marius Hofert