{"id":8294,"date":"2019-01-17T23:45:13","date_gmt":"2019-01-17T23:45:13","guid":{"rendered":"https:\/\/www.appservgrid.com\/paw92\/?p=8294"},"modified":"2019-03-08T22:04:00","modified_gmt":"2019-03-08T22:04:00","slug":"how-to-find-cpu-minimum-current-maximum-frequency-in-linux","status":"publish","type":"post","link":"https:\/\/www.appservgrid.com\/paw92\/index.php\/2019\/01\/17\/how-to-find-cpu-minimum-current-maximum-frequency-in-linux\/","title":{"rendered":"How to find cpu minimum, current & maximum frequency in linux ?"},"content":{"rendered":"

How to find cpu minimum, current & maximum frequency in linux ?<\/h3>\n
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<\/div>\n<\/div>\n
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cpu manufacturers pro-grammatically reduce the frequency of the processor. You can find out the current and possible frequency with the command:<\/div>\n


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How to find available frequencies ?<\/div>\n


\n<\/b><\/p>\n

cat \u00a0\/sys\/devices\/system\/cpu\/cpu*\/cpufreq\/scaling_available_frequencies<\/div>\n


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Sample output:<\/div>\n


\n<\/b><\/p>\n

cat \u00a0\/sys\/devices\/system\/cpu\/cpu*\/cpufreq\/scaling_available_frequencies<\/div>\n
2933000 2128000 1596000<\/div>\n
2933000 2128000 1596000<\/div>\n


\n<\/b><\/p>\n

Finding each core \u00a0\u00a0minimum, current & maximum frequency<\/div>\n


\n<\/b><\/p>\n

grep ” \/sys\/devices\/system\/cpu\/cpu0\/cpufreq\/scaling_{min,cur,max}_freq<\/div>\n


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Sample output:<\/div>\n


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\/sys\/devices\/system\/cpu\/cpu0\/cpufreq\/scaling_min_freq:1596000<\/div>\n
\/sys\/devices\/system\/cpu\/cpu0\/cpufreq\/scaling_cur_freq:1596000<\/div>\n
\/sys\/devices\/system\/cpu\/cpu0\/cpufreq\/scaling_max_freq:2933000<\/div>\n


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Here we can see that the current processor frequency-1596 Mhz and the maximum-2933 Mhz.<\/div>\n


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Above example for core 0 if you have N number of cores use *:<\/div>\n


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grep ” \/sys\/devices\/system\/cpu\/cpu*\/cpufreq\/scaling_{min,cur,max}_freq<\/div>\n


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Sample output :<\/div>\n


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\/sys\/devices\/system\/cpu\/cpu0\/cpufreq\/scaling_min_freq:1596000<\/div>\n
\/sys\/devices\/system\/cpu\/cpu1\/cpufreq\/scaling_min_freq:1596000<\/div>\n
\/sys\/devices\/system\/cpu\/cpu0\/cpufreq\/scaling_cur_freq:1596000<\/div>\n
\/sys\/devices\/system\/cpu\/cpu1\/cpufreq\/scaling_cur_freq:2128000<\/div>\n
\/sys\/devices\/system\/cpu\/cpu0\/cpufreq\/scaling_max_freq:2933000<\/div>\n
\/sys\/devices\/system\/cpu\/cpu1\/cpufreq\/scaling_max_freq:2933000<\/div>\n


\n<\/b><\/p>\n

How to find cpu count ?<\/div>\n


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grep -c ‘model name’ \/proc\/cpuinfo<\/div>\n


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Sample output :<\/div>\n


\n<\/b><\/p>\n

2<\/div>\n
Use various performance governors.<\/p>\n

ondemand: The CPU freq governor “on-demand” sets the CPU depending on the current usage.<\/p><\/div>\n

To do this the CPU must have the capability to switch the frequency very quickly.<\/div>\n
\nconservative: The CPU freq governor “conservative”, much like the “on-demand” governor, sets<\/div>\n
the CPU depending on the current usage. It differs in behavior in that it gracefully increases<\/div>\n
and decreases the CPU speed rather than jumping to max speed the moment there is any<\/div>\n
load on the CPU. This behavior is more suitable in a battery powered environment.<\/div>\n
\nuserspce: The CPU freq governor “user-space” allows the user, or any user-space program<\/div>\n
running with UID “root”, to set the CPU to a specific frequency by making a sysfs<\/div>\n
file “scaling_setspeed” available in the CPU-device directory.<\/div>\n
\npowersave: The CPU freq governor “powersave” sets the CPU statically to the lowest<\/div>\n
frequency within the borders of scaling_min_freq and scaling_max_freq.<\/div>\n
\nperformance: The CPU freq governor “performance” sets the CPU statically to the highest<\/div>\n
frequency within the borders of scaling_min_freq and scaling_max_freq.<\/div>\n

<\/p>\n

<\/b><\/p>\n

How to find available_governors?<\/b><\/div>\n


\n<\/b><\/p>\n

cat \/sys\/devices\/system\/cpu\/cpu0\/cpufreq\/scaling_available_governors<\/div>\n


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Sample output:<\/div>\n


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conservative ondemand userspace powersave performance<\/div>\n


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Set permanently one eg.:<\/p>\n

sudo echo “performance” > \/sys\/devices\/system\/cpu\/cpu0\/cpufreq\/scaling_governor<\/p><\/div>\n


\n<\/b><\/p>\n

cat \/sys\/devices\/system\/cpu\/cpu0\/cpufreq\/scaling_governor<\/div>\n


\n<\/b><\/p>\n

performance<\/div>\n<\/div>\n<\/div>\n

Source<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

How to find cpu minimum, current & maximum frequency in linux ? cpu manufacturers pro-grammatically reduce the frequency of the processor. You can find out the current and possible frequency with the command: How to find available frequencies ? cat \u00a0\/sys\/devices\/system\/cpu\/cpu*\/cpufreq\/scaling_available_frequencies Sample output: cat \u00a0\/sys\/devices\/system\/cpu\/cpu*\/cpufreq\/scaling_available_frequencies 2933000 2128000 1596000 2933000 2128000 1596000 Finding each core \u00a0\u00a0minimum, … <\/p>\n

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