Hi David,
Thanks for your reply , It seems top command also uses
/proc/stat to do the magic .Reading a similar issue for top vs another monitor
tool on
https://medium.com/@yogita088/how-to-calculate-cpu-usage-proc-stat-vs-top-e74f99f02d08
, What is the duration for which getProcessCPUload reports CPU utilisation ,
is it from system start time or 1 sec or x seconds ? It is configurable in top
command as -d parameter. This might help to discover difference btw top vs
getprocesscpuload
regards
Nikhil
-----Original Message-----
From: David Holmes <david.hol...@oracle.com>
Sent: 06 November 2023 10:58
To: Nikhil Agarwal <nikhil.a.agar...@oracle.com>; serviceability-dev@openjdk.org
Subject: Re: getProcessCPULoad returns different CPU percentage as comparead to
top linux command
Hi,
On 3/11/2023 11:50 pm, Nikhil Agarwal wrote:
> Hi All,
>
> getProcessCPULoad returns different CPU percentage as
> compared to top linux command intermittently . Does it supposed to
> returned same data as top command always . Should the
> getProcessCPULoad value be same as top/number of cpus always ?
I've no idea how top calculates what it does. The VM reads the first line of
/proc/stat to get the various tick counters.
HTH.
David
> regards
>
> Nikhil
>
