find remaining percentage of cpu

happy78 · 09-25-2005, 01:12 AM

Hi guys,

I'm trying to find out the remaining percentage of cpu. How do I do that?
I just want the cpu's status, and nothing else

I have tried vmstat, free. But that didn't give me the result I want.

addy86 · 09-25-2005, 02:45 AM

Do you mean the CPU idle time? Try top, the line beginning with CPU, the entry named "id".

jlliagre · 09-25-2005, 04:10 AM

Can you elaborate on why vmstat doesn't give you the result you want ?

happy78 · 09-26-2005, 03:50 PM

Thank you for responding.

vmstat just return this:

procs memory swap io system cpu
r b swpd free buff cache si so bi bo in cs us sy wa id
1 0 35000 1644948 411968 1127824 0 0 1 1 0 0 0 0 0 0

I know top can retrieve cpu's information, but it also returns other stuffs like:
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND

I just want to %CPU. Is there any combination of command to get the %CPU?

shanenin · 09-26-2005, 04:39 PM

when I do vmstat I get this output

Code:

shane@mainbox ~ $ vmstat
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
  r          b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 1  0      0 208000  16904 128524    0    0     4     3 1104   899 10  5 85  0

the above code is kind of missallighned. I think idle is 85 or 85%

this code will get it

Code:

my_array=($(vmstat)
echo ${my_array[36]}

I am not sure why your cpu usage according to vmstat is 0

shanenin · 09-26-2005, 05:03 PM

I was wasting all kinds of time trying to put the output of top inot one big string then parsing the info. You can do it with the same technicqe I used above

Code:

my_array=($(top -n 1))
echo ${my_array[30]}

happy78 · 09-26-2005, 05:45 PM

I followed your suggestion and keep getting 0

procs memory swap io system cpu
r b swpd free buff cache si so bi bo in cs us sy wa id
0 0 35000 1833020 411376 1156680 0 0 1 1 0 0 0 0 0 0

at position 36, it is 0. It's correct, but I dont' know if that is the value of cpu's idel.

shanenin · 09-26-2005, 05:49 PM

did you try my same method(above) using top, that should work for you.

happy78 · 09-26-2005, 05:54 PM

thank you for a very quick reply.
I just followed the top example, but it returned this: irq

shanenin · 09-26-2005, 06:01 PM

look when I enter this command

Code:

mainbox shane # top -n 1

top - 17:55:29 up 10:00,  3 users,  load average: 0.24, 0.18, 0.09
Tasks:  61 total,   1 running,  60 sleeping,   0 stopped,   0 zombie
Cpu(s):  4.3% us,  4.5% sy,  4.9% ni, 85.9% id,  0.1% wa,  0.2% hi,  0.1% si
Mem:    514760k total,   273636k used,   241124k free,    19896k buffers
Swap:   506036k total,        0k used,   506036k free,   133936k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
10091 shane     15   0 60972  32m  15m S  2.0  6.4   3:24.41 python
    1 root      16   0  1468  500  436 S  0.0  0.1   0:00.35 init
**** I cut some off****

Code:

mainbox shane # my_array=($(top -n 1))
mainbox shane # echo ${my_array[30]}
85.9%

If I count from left to right(spaces seperate my elements) starting with 0, the 85.9% is the 30th element. what does your top -n 1 look like?

happy78 · 09-26-2005, 07:32 PM

yes, that's what I'm looking for...thank you very much for your help...

shanenin · 09-26-2005, 08:02 PM

your welcome :-)