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# Fact: physicalprocessorcount
#
# Purpose: Return the number of physical processors.
#
# Resolution:
# Attempts to use sysfs to get the physical IDs of the processors. Falls
# back to /proc/cpuinfo and "physical id" if sysfs is not available.
#
# Caveats:
#
Facter.add('physicalprocessorcount') do
confine :kernel => :linux
setcode do
sysfs_cpu_directory = '/sys/devices/system/cpu' # This should always be there ...
if File.exists?(sysfs_cpu_directory)
#
# We assume that the sysfs file system has the correct number of entries
# under the "/sys/device/system/cpu" directory and if so then we process
# content of the file "physical_package_id" located inside the "topology"
# directory in each of the per-CPU sub-directories.
#
# As per Linux Kernel documentation and the file "cputopology.txt" located
# inside the "/usr/src/linux/Documentation" directory we can find following
# short explanation:
#
# (...)
#
# 1) /sys/devices/system/cpu/cpuX/topology/physical_package_id:
#
# physical package id of cpuX. Typically corresponds to a physical
# socket number, but the actual value is architecture and platform
# dependent.
#
# (...)
#
lookup_pattern = "#{sysfs_cpu_directory}" +
"/cpu*/topology/physical_package_id"
Facter::Util::Resolution.exec(
"cat #{lookup_pattern}"
).scan(/\d+/).uniq.size
else
#
# Try to count number of CPUs using the proc file system next ...
#
# We assume that /proc/cpuinfo has what we need and is so then we need
# to make sure that we only count unique entries ...
#
Facter::Util::Resolution.exec(
"grep 'physical.\\+:' /proc/cpuinfo"
).scan(/\d+/).uniq.size
end
end
end
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