Cheatsheet: Difference between revisions
→ProcFS
(→ProcFS) |
(→ProcFS) |
||
Line 552:
== ProcFS ==
*Procfs or /proc is a special FS under Linux used to present process information and kernel processes.
*Much of the information for kernel level of 2.6 & above have been moved to "sysfs" generally mounted under /sys.
*/proc is stored in memory.
*On multi-core CPUs, /proc/cpuinfo contains the fields for "siblings" and "cpu cores":
"siblings" = (HT per CPU package) * (# of cores per CPU package)
"cpu cores" = (# of cores per CPU package)
*A CPU package means physical CPU which can have multiple cores (single core for one, dual core for two, quad core for four).
*This allows a distinction between hyper-threading and dual-core, i.e. the number of hyper-threads per CPU package can be calculated by siblings / CPU cores.
*If both values for a CPU package are the same, then hyper-threading is not supported.
*For instance, a CPU package with siblings=2 and "cpu cores"=2 is a dual-core CPU but does not support hyper-threading.
| |||