3/9/2023 0 Comments Proc cpuinfo mac![]() Linux CPU Architecture Architecture: x86_64 lscpu Command – Shows CPU Architecture Info Suggested Read: How to Use ‘cat’ and ‘tac’ Commands with Examples in Linux 2. $ cat /proc/cpuinfo | grep 'core id' #show individual cores $ cat /proc/cpuinfo | grep processor | wc -l #count the number of processing units ![]() $ cat /proc/cpuinfo | grep 'model name' | uniq #display model name This can help you only output vendor name, model name, number of processors, number of cores, etc: $ cat /proc/cpuinfo | grep 'vendor' | uniq #view vendor name To get a little specific, you can employ the grep command – a CLI tool for searching plain-text data for lines matching a regular expression. Which suffices for most programs.Model name : Intel(R) Core(TM) i5-4210U CPU 1.70GHzįlags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm epb tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt dtherm ida arat pln ptsĪddress sizes : 39 bits physical, 48 bits virtual It uses 'lxcfs' to bind mount onto /proc/cpuinfo and modifies the output to only show the number of CPU cores you actually have. It would be nice to advance the scheduler to support such a concept without using the quotas specifically.Īs a final side note. You have to reduce the CPU set down to 4 specific CPUs and now if all containers scheduled to those specific 4 CPUs are busy you will be losing time to those other containers when a different 4 CPUs may be totally idle. You may then ask why not reduce the CPU set for those containers, the problem is there is no way (at least currently) to say 'this process can only run on 4 CPUs, but any of them'. However the problem comes if you have 12 threads consuming your 4 threads worth of CPU time they'll end up block for 5-10 or more milliseconds at a time where they may well be holding that lock and preventing the other threads from running. ![]() which is precisely what happens with multi threaded Python programs (they sometimes contend on the GIL) that use data science modules which do a lot of processing in C without the GIL lock held and only take it occasionally. If you want to understand more about these problems this article has some good background, although they fixed a real bug in the scheduler here the background will give you the general idea and it's still a problem to some extent if all of those threads/processes are trying to contend on a single shared lock. ![]() It would be ideal to have a standard utility or library that would also check that. you may have 12 active cores but only a budget of 4 CPUs worth of CPU time. nproc specifically does not currently check your CFS CPU cgroup quota, i.e. This is 100% a problem I was working on for a customer recently. ![]()
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