Class: Sys::CPU

Inherits:
Object
  • Object
show all
Extended by:
FFI::Library
Defined in:
lib/sys/linux/sys/cpu.rb,
lib/sys/cpu.rb,
lib/sys/unix/sys/cpu.rb,
lib/sys/windows/sys/cpu.rb

Overview

Encapsulates system CPU information

Defined Under Namespace

Classes: CPUStruct, Error, ProcInfo

Constant Summary collapse

VERSION =

The version of the sys-cpu gem.

'0.8.0'.freeze
CTL_HW =

Generic hardware/cpu

6
HW_MACHINE =

Machine class

1
HW_MODEL =

Specific machine model

2
HW_NCPU =

Number of CPU’s

3
HW_CPU_FREQ =

CPU frequency

15
HW_MACHINE_ARCH =

Machine architecture

12
SI_MACHINE = 
5
SI_ARCHITECTURE = 
6
SC_NPROCESSORS_ONLN = 
15
P_OFFLINE = 
1
P_ONLINE = 
2
P_FAULTED = 
4
P_POWEROFF = 
5
P_NOINTR = 
6
P_SPARE = 
7
CPU_ARCH_ABI64 = 
0x01000000
CPU_TYPE_X86 = 
7
CPU_TYPE_X86_64 = 
(CPU_TYPE_X86 | CPU_ARCH_ABI64)
CPU_TYPE_SPARC = 
14
CPU_TYPE_POWERPC = 
18
CPU_TYPE_POWERPC64 = 
CPU_TYPE_POWERPC | CPU_ARCH_ABI64

Class Method Summary collapse

Class Method Details

.architecture(host = Socket.gethostname) ⇒ Object

Returns the host CPU’s architecture, or nil if it cannot be determined.



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# File 'lib/sys/unix/sys/cpu.rb', line 93

def self.architecture
  if respond_to?(:sysinfo, true)
    buf = 0.chr * 257

    if sysinfo(SI_ARCHITECTURE, buf, buf.size) < 0
      raise Error, "sysinfo function failed"
    end

    buf.strip
  elsif respond_to?(:sysctlbyname, true)
    optr = FFI::MemoryPointer.new(:char, 256)
    size = FFI::MemoryPointer.new(:size_t)

    size.write_int(optr.size)

    if RbConfig::CONFIG['host_os'] =~ /darwin/i
      name = 'hw.machine'
    else
      name = 'hw.machine_arch'
    end

    if sysctlbyname(name, optr, size, nil, 0) < 0
      raise Error, "sysctlbyname function failed"
    end

    optr.read_string
  else
    buf  = 0.chr * 64
    mib  = FFI::MemoryPointer.new(:int, 2)
    size = FFI::MemoryPointer.new(:long, 1)

    mib.write_array_of_int([CTL_HW, HW_MACHINE_ARCH])
    size.write_int(buf.size)

    if sysctl(mib, 2, buf, size, nil, 0) < 0
      raise Error, "sysctl function failed"
    end

    buf.strip
  end
end

.cpu_stats ⇒ Object

Returns a hash of arrays that contains an array of the following information (as of 2.6.33), respectively:

  • user: time spent in user mode.

  • nice: time spent in user mode with low priority.

  • system: time spent in system mode.

  • idle: time spent in the idle task.

  • iowait: time waiting for IO to complete.

  • irq: time servicing interrupts.

  • softirq: time servicing softirqs.

  • steal: time spent in other operating systems when running in a virtualized environment.

  • guest: time spent running a virtual CPU for guest operating systems.

  • guest_nice: time spent running a niced guest, i.e a virtual CPU for guest operating systems.

Note that older kernels may not necessarily include some of these fields.



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# File 'lib/sys/linux/sys/cpu.rb', line 112

def self.cpu_stats
  cpu_stat_file = "/proc/stat"
  hash = {} # Hash needed for multi-cpu systems

  lines = IO.readlines(cpu_stat_file)

  lines.each_with_index{ |line, i|
    array = line.split
    break unless array[0] =~ /cpu/   # 'cpu' entries always on top

    # Some machines list a 'cpu' and a 'cpu0'. In this case only
    # return values for the numbered cpu entry.
    if lines[i].split[0] == "cpu" && lines[i+1].split[0] =~ /cpu\d/
      next
    end

    vals = array[1..-1].map{ |e| e = e.to_i / 100 } # 100 jiffies/sec.
    hash[array[0]] = vals
  }

  hash
end

.cpu_type(host = Socket.gethostname) ⇒ Object

Returns a string indicating the type of processor, e.g. GenuineIntel.



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# File 'lib/sys/windows/sys/cpu.rb', line 264

def self.cpu_type(host = Socket.gethostname)
  cs = BASE_CS + "//#{host}/root/cimv2:Win32_Processor='cpu0'"
  begin
    wmi = WIN32OLE.connect(cs)
  rescue WIN32OLERuntimeError => e
    raise Error, e
  else
    return wmi.Manufacturer
  end
end

.fpu_type ⇒ Object

Returns the floating point processor type.

Not supported on all platforms.

Raises:

  • (NoMethodError) 


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# File 'lib/sys/unix/sys/cpu.rb', line 326

def self.fpu_type
  raise NoMethodError unless respond_to?(:processor_info, true)

  pinfo = ProcInfo.new

  if processor_info(0, pinfo) < 0
    if processor_info(1, pinfo) < 0
      raise Error, "process_info function failed"
    end
  end

  pinfo[:pi_fputypes].to_s
end

.freq(cpu_num = 0, host = Socket.gethostname) ⇒ Object

Returns an integer indicating the speed (i.e. frequency in Mhz) of cpu_num on host, or the localhost if no host is specified. If cpu_num +1 is greater than the number of cpu’s on your system or this call fails for any other reason, a Error is raised.



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# File 'lib/sys/unix/sys/cpu.rb', line 258

def self.freq
  if respond_to?(:sysctlbyname, true)
    optr = FFI::MemoryPointer.new(:long)
    size = FFI::MemoryPointer.new(:size_t)

    size.write_long(optr.size)

    if RbConfig::CONFIG['host_os'] =~ /bsd/i
      name = 'hw.clockrate'
    else
      name = 'hw.cpufrequency'
    end

    if sysctlbyname(name, optr, size, nil, 0) < 0
      raise Error, "sysctlbyname failed"
    end

    if RbConfig::CONFIG['host_os'] =~ /darwin/i
      optr.read_long / 1000000
    else
      optr.read_long
    end
  elsif respond_to?(:sysctl, true)
    buf  = 0.chr * 16
    mib  = FFI::MemoryPointer.new(:int, 2)
    size = FFI::MemoryPointer.new(:long, 1)

    mib.write_array_of_int([CTL_HW, HW_CPU_FREQ])
    size.write_int(buf.size)

    if sysctl(mib, 2, buf, size, nil, 0) < 0
      raise Error, "sysctl function failed"
    end

    buf.unpack("I*").first / 1000000
  else
    pinfo = ProcInfo.new

    # Some systems start at 0, some at 1
    if processor_info(0, pinfo) < 0
      if processor_info(1, pinfo) < 0
        raise Error, "process_info function failed"
      end
    end

    pinfo[:pi_clock].to_i
  end
end

.load_avg(cpu_num = 0, host = Socket.gethostname) ⇒ Object

Returns the load capacity for cpu_num on host, or the localhost if no host is specified, averaged to the last second. Processor loading refers to the total computing burden for each processor at one time.

Note that this attribute is actually the LoadPercentage. I may use one of the Win32_Perf* classes in the future.



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# File 'lib/sys/unix/sys/cpu.rb', line 310

def self.load_avg
  if respond_to?(:getloadavg, true)
    loadavg = FFI::MemoryPointer.new(:double, 3)

    if getloadavg(loadavg, loadavg.size) < 0
      raise Error, "getloadavg function failed"
    end

    loadavg.get_array_of_double(0, 3)
  end
end

.machine ⇒ Object

Returns the cpu’s class type. On most systems this will be identical to the CPU.architecture method. On OpenBSD it will be identical to the CPU.model method.



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# File 'lib/sys/unix/sys/cpu.rb', line 179

def self.machine
  if respond_to?(:sysctl, true)
    buf  = 0.chr * 32
    mib  = FFI::MemoryPointer.new(:int, 2)
    size = FFI::MemoryPointer.new(:long, 1)

    mib.write_array_of_int([CTL_HW, HW_MACHINE])
    size.write_int(buf.size)

    if sysctl(mib, 2, buf, size, nil, 0) < 0
      raise Error, "sysctl function failed"
    end

    buf.strip
  else
    buf = 0.chr * 257

    if sysinfo(SI_MACHINE, buf, buf.size) < 0
      raise Error, "sysinfo function failed"
    end

    buf.strip
  end
end

.model(host = Socket.gethostname) ⇒ Object

Returns a string indicating the cpu model, e.g. Intel Pentium 4.



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# File 'lib/sys/unix/sys/cpu.rb', line 206

def self.model
  if RbConfig::CONFIG['host_os'] =~ /darwin/i
    ptr  = FFI::MemoryPointer.new(:long)
    size = FFI::MemoryPointer.new(:size_t)

    size.write_long(ptr.size)

    if sysctlbyname("hw.cputype", ptr, size, nil, 0) < 0
      raise "sysctlbyname function failed"
    end

    case ptr.read_long
      when  CPU_TYPE_X86, CPU_TYPE_X86_64
        "Intel"
      when CPU_TYPE_SPARC
        "Sparc"
      when CPU_TYPE_POWERPC, CPU_TYPE_POWERPC64
        "PowerPC"
      else
        "Unknown"
    end
  else
    if respond_to?(:sysctl, true)
      buf  = 0.chr * 64
      mib  = FFI::MemoryPointer.new(:int, 2)
      size = FFI::MemoryPointer.new(:long, 1)

      mib.write_array_of_int([CTL_HW, HW_MODEL])
      size.write_int(buf.size)

      if sysctl(mib, 2, buf, size, nil, 0) < 0
        raise Error, "sysctl function failed"
      end

      buf.strip
    else
      pinfo = ProcInfo.new

      # Some systems start at 0, some at 1
      if processor_info(0, pinfo) < 0
        if processor_info(1, pinfo) < 0
          raise Error, "process_info function failed"
        end
      end

      pinfo[:pi_processor_type].to_s
    end
  end
end

.num_cpu(host = Socket.gethostname) ⇒ Object

Returns an integer indicating the number of cpu’s on the system. – This (oddly) requires a different class.



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# File 'lib/sys/unix/sys/cpu.rb', line 139

def self.num_cpu
  if respond_to?(:sysctlbyname, true)
    optr = FFI::MemoryPointer.new(:long)
    size = FFI::MemoryPointer.new(:size_t)

    size.write_long(optr.size)

    if sysctlbyname('hw.ncpu', optr, size, nil, 0) < 0
      raise Error, "sysctlbyname failed"
    end

    optr.read_long
  elsif respond_to?(:sysconf, true)
    num = sysconf(SC_NPROCESSORS_ONLN)

    if num < 0
      raise Error, "sysconf function failed"
    end

    num
  else
    buf  = 0.chr * 4
    mib  = FFI::MemoryPointer.new(:int, 2)
    size = FFI::MemoryPointer.new(:long, 1)

    mib.write_array_of_int([CTL_HW, HW_NCPU])
    size.write_int(buf.size)

    if sysctl(mib, 2, buf, size, nil, 0) < 0
      raise Error, "sysctl function failed"
    end

    buf.strip.unpack("C").first
  end
end

.processors(host = Socket.gethostname) ⇒ Object

Returns a CPUStruct for each CPU on host, or the localhost if no host is specified. A CPUStruct contains the following members:

  • address_width

  • architecture

  • availability

  • caption

  • config_manager_error_code

  • config_manager_user_config

  • cpu_status

  • creation_class_name

  • freq

  • voltage

  • data_width

  • description

  • device_id

  • error_cleared?

  • error_description

  • ext_clock

  • family

  • install_date

  • l2_cache_size

  • l2_cache_speed

  • last_error_code

  • level

  • load_avg

  • manufacturer

  • max_clock_speed

  • name

  • other_family_description

  • pnp_device_id

  • power_management_supported?

  • power_management_capabilities

  • processor_id

  • processor_type

  • revision

  • role

  • socket_designation

  • status

  • status_info

  • stepping

  • system_creation_class_name

  • system_name

  • unique_id

  • upgrade_method

  • version

  • voltage_caps

Note that not all of these members will necessarily be defined.



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# File 'lib/sys/linux/sys/cpu.rb', line 59

def self.processors
  array = []
  CPU_ARRAY.each{ |hash|
    struct = CPUStruct.new
    struct.members.each{ |m| struct.send("#{m}=", hash["#{m}"]) }
    if block_given?
      yield struct
    else
      array << struct
    end
  }
  array unless block_given?
end

.state(num = 0) ⇒ Object

Returns the current state of processor num, or 0 if no number is specified.

Not supported on all platforms.

Raises:

  • (NoMethodError) 


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# File 'lib/sys/unix/sys/cpu.rb', line 345

def self.state(num = 0)
  raise NoMethodError unless respond_to?(:processor_info, true)

  pinfo = ProcInfo.new

  if processor_info(num, pinfo) < 0
    raise Error, "process_info function failed"
  end

  case pinfo[:pi_state].to_i
    when P_ONLINE
      "online"
    when P_OFFLINE
      "offline"
    when P_POWEROFF
      "poweroff"
    when P_FAULTED
      "faulted"
    when P_NOINTR
      "nointr"
    when P_SPARE
      "spare"
    else
      "unknown"
  end
end