OS X CPU usage always reporting as 100%

[daenney]

The problem appears to be in

iostat -c 2 | tail -n 1 | tr -s ' ' ';' | cut -d ';' -f 7 | awk '{usage=100-$1} END {printf("%5.1f%%", usage)}'

This always returns 100% in my case even though looking at the activity monitor there's nothing eating this much CPU, I'm not even consuming a whole core.

[daenney]

Going through the different steps:

16:56:57 ~ $ iostat -c 2                                                                                                                                                       [0/0]
          disk0           disk2       cpu     load average
    KB/t tps  MB/s     KB/t tps  MB/s  us sy id   1m   5m   15m
   40.06   7  0.27   166.84   0  0.00   5  3 93  1.65 1.52 1.40
    0.00   0  0.00     0.00   0  0.00   6  5 89  1.65 1.52 1.40
16:59:27 ~ $ iostat -c 2 | tail -n 1
    0.00   0  0.00     0.00   0  0.00   5  5 90  1.51 1.49 1.39
16:59:38 ~ $ iostat -c 2 | tail -n 1 | tr -s ' ' ';'
;0.00;0;0.00;0.00;0;0.00;5;5;90;1.47;1.49;1.39
16:59:46 ~ $ iostat -c 2 | tail -n 1 | tr -s ' ' ';' | cut -d ';' -f 7
0.00
17:00:08 ~ $ iostat -c 2 | tail -n 1 | tr -s ' ' ';' | cut -d ';' -f 7 | awk '{usage=100-$1} END {printf("%5.1f%%", usage)}'
100.0%

It looks like the cut should be -f 10 to get CPU idle

[ctjhoa]

@daenney it's because you have 2 disk and mine have one:

| => iostat -c 2
          disk0       cpu     load average
    KB/t tps  MB/s  us sy id   1m   5m   15m
   30.39  14  0.42  14  8 77  2.23 4.23 5.12
    0.00   0  0.00   4  2 93  2.37 4.23 5.12

I will try to fix this.

[ctjhoa]

@daenney could you give me the output of:

iostat -c 2 disk0

[daenney]

09:23:28 ~ $ iostat -c 2 disk0
          disk0       cpu     load average
    KB/t tps  MB/s  us sy id   1m   5m   15m
   40.10   7  0.27   5  3 93  1.22 1.23 1.41
   13.00   4  0.05   9  4 87  1.22 1.23 1.41

Additional disks in OS X will start showing up for any mounted DMG, USB drive and so on.

[ctjhoa]

OK, so this should be the fix.

 iostat -c 2 disk0 | tail -n 1 | tr -s ' ' ';' | cut -d ';' -f 7 | awk '{usage=100-$1} END {printf("%5.1f%%", usage)}'

If it gave the right ouput, could you update your PR please.

[daenney]

Done :smile:.

[ctjhoa]

@daenney Thanks!