Re: Detecting CPU Speed

27 Mar 2007

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Hi Gary,
Thanks,
Luke
On Mar 27, 2007, at 1:25 PM, Gary Pederson wrote:
sub CpuFrequency {
   ##################################################################
   # This should work on 10.2 and later:
   local $value = 0;
   local @hardware = `system_profiler SPHardwareDataType`;
   chomp @hardware;
   foreach ( @hardware ) {
       if ( m/^\s*CPU Speed: (\d+) ([MGTPEZY])Hz/ ) {
           $value = $1.$2;
           $value =~ s/M/000000/;
           $value =~ s/G/000000000/;
           $value =~ s/T/000000000000/;
           $value =~ s/P/000000000000000/;
           $value =~ s/E/000000000000000000/;
           $value =~ s/Z/000000000000000000000/;
           $value =~ s/Y/000000000000000000000000/;
       }
   }
   return $value;
}

On Mar 26, 2007, at 9:55 PM, Gary Pederson wrote:
The incorrect values are from /usr/sbin/sysctl.

On Mar 26, 2007, at 11:52 AM, Luke Bellandi wrote:
Gary,
On Mar 24, 2007, at 5:55 PM, Gary Pederson wrote:
On those systems, sysctl returns
  hw.cpufrequency: 533333332
  hw.cpufrequency_min: 533333332
  hw.cpufrequency_max: 533333332
When it should report
  hw.cpufrequency: 867000000
  hw.cpufrequency_min: 533333332
  hw.cpufrequency_max: 867000000

- Luke
Thanks,
Gary Pederson

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Interesting.  Please file a bug against system_profiler on http://bugreporter.apple.com
.
I tested it and "system_profiler SPHardwareDataType" works on G4
laptops pre-10.4.
Here's the perl subroutine I'm using, if anyone else wonders into
this (we can dream about YHz in out code, right?):
In an earlier email, Daniel Soderberg suggested using the following
command:

system_profiler SPHardwareDataType | grep Speed
I haven't gotten back to those systems to see if it works, but I'll
post the results within a few days.
I've been detecting CPU speed in my InstallationCheck scripts using
`sysctl -n hw.cpufrequency` and `sysctl -n hw.cpufrequency_max`
These are returning the correct values on most machines, but the
wrong values on other machines (at least 867MHz G4 PowerBooks in
10.3.9) -- So some of our customers get a confusing message about
their CPU being too slow.

Are these values returned from your Javascript functions in your
distribution, or are they the values returned from /usr/sbin/sysctl?
If they're coming from your Javascript, check what /usr/sbin/sysctl
is returning for that property and let us know if that's correct.

Is there a way to accurately detect the maximum cpu speed on all OS
X Macs? Or at least on the ones I need to support (G4, G5, x86 --
10.3.9 and later)?
This email sent to luke@apple.com

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Luke Bellandi

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