...how many processors?

radiance-general
1

The following possibly-useful fragments ask most Unix systems (I've tried it on BSD and Mac) how many processors there are.

(t)csh:
  set nproc = `sysctl -n hw.ncpu`

bash/ksh:
  nproc=`sysctl -n hw.ncpu`

Python:

···

from subprocess import Popen
def getnproc():
    GETN = 'sysctl -n hw.ncpu'
    nproc = 1
    sysc = Popen(GETN.split(), stdout=PIPE)
    (out,junk) = sysc.communicate()
    if sysc.returncode == 0:
        nproc = int(out)
    return nproc

--
Randolph

2

What a nice little Friday afternoon gift. Thanks Randolph!

···

On Fri, Oct 8, 2010 at 12:26 PM, Randolph M. Fritz <RFritz@lbl.gov> wrote:

The following possibly-useful fragments ask most Unix systems (I've tried
it on BSD and Mac) how many processors there are.

(t)csh:
set nproc = `sysctl -n hw.ncpu`

bash/ksh:
nproc=`sysctl -n hw.ncpu`

Python:

from subprocess import Popen
def getnproc():
   GETN = 'sysctl -n hw.ncpu'
   nproc = 1
   sysc = Popen(GETN.split(), stdout=PIPE)
   (out,junk) = sysc.communicate()
   if sysc.returncode == 0:
       nproc = int(out)
   return nproc

--
Randolph

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--

Rob Guglielmetti
www.rumblestrip.org

3

Unfortunately, this doesn't work on Linux, bah!

On Linux, the following shell command will do it:
  grep 'processor' /proc/cpuinfo |wc -l

I wonder what works on Solaris...

···

--
Randolph

4

On 08/10/10, 19:26:11, Randolph "M." Fritz <RFritz@lbl.gov> wrote regarding
[Radiance-general] ...how many processors?:

The following possibly-useful fragments ask most Unix systems (I've
tried it on BSD and Mac) how many processors there are.

(t)csh:
  set nproc = `sysctl -n hw.ncpu`

bash/ksh:
  nproc=`sysctl -n hw.ncpu`

sysctl is not available on Solaris. For Solaris I use:

$ psrinfo | wc -l
       4

It's more rigourous to look for on-line processors (but I don't ever off
line mine):

# psrinfo | grep -c on-line
4
# psradm -f 2
# psrinfo | grep -c on-line
3

That gives the number of virtual processors which usually is good enough,
to get more detail use (Solaris 9+):

$ psrinfo -vp
The physical processor has 2 virtual processors (0 1)
  x86 (chipid 0x0 AuthenticAMD family 15 model 65 step 3 clock 2613 MHz)
        Dual-Core AMD Opteron(tm) Processor 2218 HE
The physical processor has 2 virtual processors (2 3)
  x86 (chipid 0x1 AuthenticAMD family 15 model 65 step 3 clock 2613 MHz)
        Dual-Core AMD Opteron(tm) Processor 2218 HE

or for even more system detail:

$ prtdiag
System Configuration: Sun Microsystems Sun Fire X2200 M2
BIOS Configuration: Sun Microsystems S39_3B25 11/15/2007
BMC Configuration: IPMI 1.5 (KCS: Keyboard Controller Style)

==== Processor Sockets ====================================

Version Location Tag
-------------------------------- --------------------------
Dual-Core AMD Opteron(tm) Processor 2218 HE U
Dual-Core AMD Opteron(tm) Processor 2218 HE U

...etc...

James.