52 lines
2.1 KiB
Plaintext
52 lines
2.1 KiB
Plaintext
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#!/usr/bin/gawk -f
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#-------------------------------------------------------------------------------
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# ~/bin/cpustat : display cpu utilization
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#
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# usage : normally used as a GNU/screen backtick
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#
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# notes : 1. Works on the assumption that /proc/stat's first line
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# : has the total "jiffies" since boot up used by the
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# : different types of tasks in the system. See the
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# : filesystems/proc.txt document in kernel source tree
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# :
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# : 2. Displays a total CPU% (user+system+nice) as well as
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# : user CPU% system CPU% and nice CPU%
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#-------------------------------------------------------------------------------
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BEGIN {
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file = "/proc/stat"
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while (getline < file) { # read first line
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# extract jiffies:
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user=$2-user_saved; # . user
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nice=$3-nice_saved; # . nice user
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syst=$4-syst_saved; # . system
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idle=$5-idle_saved; # . idle
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wait=$6-wait_saved; # . iowait
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irqs=$7-irqs_saved; # . irq
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sirq=$8-sirq_saved; # . softirq
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cact=user+syst+nice; # what counts
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ctot=user+nice+syst+idle+wait+irqs+sirq; # total activity
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tcpu=cact/ctot*100; # total % cpu utilization
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ucpu=user/ctot*100; # user % cpu utilization
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scpu=syst/ctot*100; # system % cpu utilization
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ncpu=nice/ctot*100; # nice % cpu utilization
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printf "%.1f %%\n",tcpu
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user_saved=$2; # save the current jiffies
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nice_saved=$3; # values for the next loop
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syst_saved=$4;
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idle_saved=$5;
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wait_saved=$6;
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irqs_saved=$7;
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sirq_saved=$8;
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close(file) # re-read file
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system("sleep 3")
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}
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}
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