2/18/2023 0 Comments Bash return proc cpuinfoWe can change the period by modifying the value after the -n option. The above output will refresh every second. Model name : Intel(R) Core(TM) i7-7500U CPU 2.70GHz If we want to monitor the speed for some period of time, we can use the watch command: $ watch -n1 "grep Hz /proc/cpuinfo"Įvery 1.0s: grep Hz /proc/cpuinfo baeldung: Sun Jun 26 16:21:32 2022 In this example, the clock rates are the same for both cores. So, it means that there are two cores in this particular system that gives the above output. In this case, these values are 2.70 GHz and 2904.004 MHz, respectively.įurthermore, the reason there are two outputs is that this file displays CPU information for each processor core. > linux-pm/arch/x86/kernel/cpu/aperfmperf.Model name : Intel(R) Core(TM) i7-7500U CPU 2.70GHzĪs we mentioned previously, there are base and real-time clock speeds. > - linux-pm.orig/arch/x86/kernel/cpu/aperfmperf.c > Index: linux-pm/arch/x86/kernel/cpu/aperfmperf.c > unsigned int freq = aperfmperf_get_khz(cpu) > - unsigned int freq = cpufreq_quick_get(cpu) pcpu(grep physical id /proc/cpuinfo sort. > seq_printf(m, "microcode\t: 0x%x\n", c->microcode) Bash Script arc(uname -a) Shows the architecture and kernel version of the current operating system. > -78,9 80,11 static int show_cpuinfo(struct seq_file > * Get CPU information for use by the procfs. > linux-pm/arch/x86/kernel/cpu/proc.c > - linux-pm.orig/arch/x86/kernel/cpu/proc.c > Index: linux-pm/arch/x86/kernel/cpu/proc.c Example of linux CentOS server with 2 vCPU : rootcentos62 cat /proc/cpuinfo grep processor processor : 0 processor : 1. > 5 files changed, 67 insertions( ), 23 deletions(-) > I'm going to route it via the linux-pm tree. > Fixes: 890da9cf0983 (Revert "x86: do not use cpufreq_quick_get() for /proc/cpuinfo "cpu MHz"") asynchronously at the /proc/cpuinfo open time, add a single delay > upfront (if necessary) at that point and simply compute the current > frequency while running showcpuinfo() for each individual CPU. > which should be sufficient to get large enough numbers for the > the default delay between consecutive APERF and MPERF reads to 10 ms, > Also, to avoid slowing down /proc/cpuinfo accesses too much, reduce sync aperfmperf_snapshot_khz() w/o any sleep: async aperfmperf_snapshot_khz() w/ 10ms sleep: With 10ms sleep takes much longer than calling aperfmperf_snapshot_khz() > frequency while running show_cpuinfo() for each individual CPU.īut from what I got, calling aperfmperf_snapshot_khz() asynchronously This will output the contents on the command line, and you can press ‘Enter’ to scroll. You can also view the contents of this file directly on the command line by running: less /proc/cpuinfo. ![]() > upfront (if necessary) at that point and simply compute the current As you can see in the screenshot above, all the information like the model name, speed, cache size, is present in the file. > asynchronously at the /proc/cpuinfo open time, add a single delay Run aperfmperf_snapshot_khz() once on all CPUs > lead to unacceptable access times for /proc/cpuinfo on systems with > However, do that carefully enough to avoid accumulating delays that > registers, if available, and use their values to compute the CPU ![]() > aperfmperf_snapshot_khz() to snapshot the APERF and MPERF feedback > To that end, modify the /proc/cpuinfo implementation on x86 to use > CPU frequency like the scaling_cur_freq sysfs file in cpufreq. > order to restore the previous behavior, make it report the current > inconsistent and is different from what it was before 4.13, so in > cpufreq, depending on the cpufreq configuration. > or the frequency most recently requested by a scaling governor in > on x86 can be either the nominal CPU frequency (which is constant) ![]() > for /proc/cpuinfo "cpu MHz"") the "cpu MHz" number in /proc/cpuinfo > After commit 890da9cf0983 (Revert "x86: do not use cpufreq_quick_get() Wysocki: "Re: x86 / CPU: Always show current CPU frequency in /proc/cpuinfo" In reply to: Thomas Gleixner: "Re: x86 / CPU: Always show current CPU frequency in /proc/cpuinfo".Previous message: Ran Wang: "RE: usb: dwc3: Enable the USB snooping".Next message: James Bottomley: "Re: first round of SCSI updates for the 4.14 merge window".Linux-Kernel Archive: Re: x86 / CPU: Always show current CPU frequency in /proc/cpuinfo Re: x86 / CPU: Always show current CPU frequency in /proc/cpuinfo From: WANG Chao
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