How to check CPU useage ?

Dear Team
I have one procedure which is executing daily two times(i.e morning run and evening run)
In morning run it's executing around 150 mins and evening run executing around 25 mins.
It's happening for all procedures executing in longer run in morning.
There is NO LOCKS, I have checked LOCKS while executing morning run.
I suspects CPU usage in morining run.
Could you please tell us how to check CPU useage ? AND also each session how much ultlizing CPU.
I'm using oracle 8i database, I know it's older version but my company is using oracle 8i
so i have to look in this database version only
Appricate quick response on this.

user11081688 wrote:
Hi,
please find the below information.
Oracle8i Enterprise Edition Release 8.1.7.4.0 - Production
PL/SQL Release 8.1.7.4.0 - Production
CORE     8.1.7.0.0     Production
TNS for Solaris: Version 8.1.7.4.0 - Production
NLSRTL Version 3.4.1.0.0 - Production
How i can know the process spending on each SID ?only with much difficulty.
How many DBs run on this system?
post FORMATTED results from "top" as shown below
top - 16:47:20 up 7 days,  8:58,  2 users,  load average: 0.05, 0.09, 0.03
Tasks: 162 total,   1 running, 161 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.8%us,  1.3%sy,  0.0%ni, 97.3%id,  0.4%wa,  0.0%hi,  0.2%si,  0.0%st
Mem:    909120k total,   784996k used,   124124k free,   133372k buffers
Swap:  1735012k total,   263980k used,  1471032k free,   426644k cached
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND           
19010 oracle    15   0  2420  956  704 R  2.0  0.1   0:00.02 top               
    1 root      18   0  2156  548  520 S  0.0  0.1   0:11.67 init              
    2 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 migration/0       
    3 root      34  19     0    0    0 S  0.0  0.0   0:01.73 ksoftirqd/0       
    4 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/0        
    5 root      10  -5     0    0    0 S  0.0  0.0   0:37.01 events/0     

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