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Hi,
How to calculate MCPS using Streamline data?
Regards,
abhishek
Hi Joe,
Yes am able to see clock chart shown by you.
i need to calculate MCPS (Million Cycles Per Second) for my program using Streamline. The clock chart gives MCPS figure, but we need to know how did it arrive at that figure? In functions tab, its showing self samples. How is this used to calculate MCPS?
Hi abhishek,
Streamline arrives at this figure by tapping into the Performance Monitoring Unit hardware counters of a processor (see here for a functional description of the PMU on a Cortex-A7 as an example): PMU functional description
In other words, it's sampled directly from the hardware.
Thanks,
Joe
Thanks for the response. How is self samples related to clock cycles?
No problem. Since Streamline is sample based (you decide how often you want Streamline to sample, up to 1 ms accuracy), it periodically checks which function a program is in and reports back. This allows you to see where in the code a system is spending the most time.
Streamline also periodically samples the PMU to collect a value for clock cycles, so what you see is a representative value.
If you're looking for a more in-depth explanation, I'm sure my colleagues wadecherry or paulbarrick from the Streamline team could help out.
Cheers,
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