Fwd: CPU usage

[çç]

Hi

I am running a userspace tool that reads/writes ISO data from a USB
device. ( ISO means periodic data). I am measuring load created by the
tool using 'top' tool which shows CPU usage as 0% sometimes and 40%
sometimes.

If the data is periodic why the CPU usage vary so much ? Can any one
point out what is the missing link ? Does any have a better approach
to measure CPU usage.

Thanks in Advance
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