On Wed, 2007-11-07 at 13:38 -0500, James wrote:
> All,
>
> I'm writing a piece of code that requires I gather the following
> statistics every second:
>
> - CPU Usage (as a percentage)
this is an interesting one. I had to do this recently, and the only
place I could get the data from is /proc/stat
Except that the data is not in % and reading the top source code made me
go crosseyed! They make a simple task so complicated!
I ended up with this ugly ... 6 liner!
ifsProcStat.open ("/proc/stat");
...
// in a loop:
ifsProcStat.seekg (0, std::ios::beg);
ifsProcStat >> strIgnore >> iUser >> iNice >> iSys >> iIdle >> iIoWait >>
iIrq >> iSoftIrq;
iTotal = iUser + iNice + iSys + iIdle + iIoWait + iIrq + iSoftIrq;
fCpuIdleAct = ((float)(iIdle - iOldIdle) / (iTotal - iOldTotal)) * 100.0F;
iOldIdle = iIdle;
iOldTotal = iTotal;
// end of loop
Of course, I was looking at idle time as a % - you would be interested
in User time perhaps.
> - NIC I/O
> - Hard Drive I/O
I'll leave these up to you!
And of course this could be complete wrong! I would welcome any
comments on my bad coding :)
HTH,
--
Iain Buchanan <iaindb at netspace dot net dot au>
Most people can do without the essentials, but not without the luxuries.
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