Note that BSD-derived systems other than anycodings_linux macOS - e.g., FreeBSD - only support the anycodings_linux hw.ncpu key for sysctl, which are anycodings_linux deprecated on macOS I'm unclear on anycodings_linux which of the new keys hw.npu corresponds anycodings_linux to: hw.(logical|physical)cpu_. # Counting the *unique* cores across lines tells us the # - in the case of hyperthreading - more logical CPUs. # Linux: The 2nd column contains the core ID, with each core ID having 1 or # which tells us the number of *logical* CPUs. # Linux: Simply count the number of (non-comment) output lines from `lscpu -p`, # Number of LOGICAL CPUs (includes those reported by hyper-threading cores) # systems, currently disabled (offline) CPUs are NOT # `-p` reports *online* CPUs only - i.e., on hot-pluggable # generated by `-p` to support older distros, too. # formats, but we stick with the parseable legacy format # Note: Newer versions of `lscpu` support more flexible output # Linux: Parse output from `lscpu -p`, where each output line represents # number of *currently* available ones see below. # available dropping the "_max" suffix would report the
# current power-management mode could make *fewer* CPUs # available number of CPUs is reported, whereas the # CAVEAT: Using the "_max" key suffixes means that the *maximum* # macOS: Use `sysctl -n hw.*cpu_max`, which returns the values of With anycodings_linux each level comprising 1 or more anycodings_linux instances of the next lower level. Linux anycodings_linux uses the following taxonomy, starting anycodings_linux with the smallest unit:ĬPU < core anycodings_linux < socket < book < node Non-hyper-threading cores each anycodings_linux correspond to 1 CPU, whereas anycodings_linux hyper-threading cores contain more than anycodings_linux 1 (typically: 2) - logical - CPU. Terminology note: CPU refers to the anycodings_linux smallest processing unit as seen by the anycodings_linux OS. Uses lscpu for Linux, and sysctl for anycodings_linux macOS. Here's a sh (POSIX-compliant) snippet anycodings_linux that works on Linux and macOS for anycodings_linux determining the number of - online - anycodings_linux logical or physical CPUs see the anycodings_linux comments for details. Getconf _NPROCESSORS_ONLN / getconf anycodings_linux NPROCESSORS_ONLN doesn't distinguish anycodings_linux between logical and physical CPUs. The problem with the /proc/cpuinfo-based anycodings_linux answers is that they parse information anycodings_linux that was meant for human consumption and anycodings_linux thus lacks a stable format designed for anycodings_linux machine parsing: the output format can anycodings_linux differ across platforms and runtime anycodings_linux conditions using lscpu -p on Linux (and anycodings_linux sysctl on macOS) bypasses that problem.
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