ca71c038a1
IO#popen is called for each call to Hardware.is_64_bit?; this becomes costly when it is repeatedly invoked. Luckily it is an invariant, so we can store it in a class variable. False is a valid value for this method, so the usual ||= idiom is not applicable. Signed-off-by: Jack Nagel <jacknagel@gmail.com>
75 lines
1.5 KiB
Ruby
75 lines
1.5 KiB
Ruby
class Hardware
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# These methods use info spewed out by sysctl.
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# Look in <mach/machine.h> for decoding info.
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def self.cpu_type
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@@cpu_type ||= `/usr/sbin/sysctl -n hw.cputype`.to_i
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case @@cpu_type
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when 7
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:intel
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when 18
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:ppc
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else
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:dunno
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end
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end
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def self.intel_family
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@@intel_family ||= `/usr/sbin/sysctl -n hw.cpufamily`.to_i
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case @@intel_family
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when 0x73d67300 # Yonah: Core Solo/Duo
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:core
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when 0x426f69ef # Merom: Core 2 Duo
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:core2
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when 0x78ea4fbc # Penryn
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:penryn
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when 0x6b5a4cd2 # Nehalem
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:nehalem
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when 0x573B5EEC # Arrandale
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:arrandale
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when 0x5490B78C
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:sandybridge # Sandy bridge
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else
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:dunno
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end
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end
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def self.processor_count
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@@processor_count ||= `/usr/sbin/sysctl -n hw.ncpu`.to_i
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end
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def self.cores_as_words
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case Hardware.processor_count
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when 1 then 'single'
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when 2 then 'dual'
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when 4 then 'quad'
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else
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Hardware.processor_count
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end
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end
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def self.is_32_bit?
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not self.is_64_bit?
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end
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def self.is_64_bit?
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return @@is_64_bit if defined? @@is_64_bit
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@@is_64_bit = self.sysctl_bool("hw.cpu64bit_capable")
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end
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def self.bits
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Hardware.is_64_bit? ? 64 : 32
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end
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protected
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def self.sysctl_bool(property)
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result = nil
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IO.popen("/usr/sbin/sysctl -n #{property} 2>/dev/null") do |f|
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result = f.gets.to_i # should be 0 or 1
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end
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$?.success? && result == 1 # sysctl call succeded and printed 1
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end
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end
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