Project - Gadgeteer Performance Test - Calculating Digits of PI

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Gadgeteer Performance Test - Calculating Digits of PI

A sample project used to compare the performance of different Gadgeteer Mainboards.

4 Likes
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Interesting results…

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Wow… The difference between the Mountaineer & the Cerberus is disturbing. Is this a difference in compilers or is the Cerberus not taking advantage of the FPU?

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That would be my guess. I’d like to see where the G120 fits in here.

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This is only a start and I hope that some other folks will post some sample performance testing code as well. The reality is Gadgeteer packs some incredible punch in a small easy to use package and at $30 that Cerberus is a heck of a deal as its a destroyer that can punch it out with the cruisers (why I have a bucket full of them). The Spider while slower is still my go to mainboard as its untouchable in terms of flexibility, you can hook up anything to a Spider. The other boards are great too and hence why I have them as every board has its place because of what it offers and hence why I sometimes fear performance tests like this as then people tend to focus on just one aspect of a mainboard.

Next classic test might be a Whetstone to give the FPU a better workout, anyone got one (or any other FPU test algorithm)

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You ought to do a comparison with RLP…

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For Whats it worth, I just tested my G400D to see its performance.

Calculate 200 Digits of Pi

G400D Beta with latest firmware.
1 min 07 sec

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@ scardinale - Not bad!

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G120 200 digits Pi

Release: 00:14:52
Debug: 00:18:02

Release in overdrive: 00:09:52


 var emcclksel = new Register(0x400FC100);
 emcclksel.ClearBits(1 << 0); // OVERDRIVE
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@ andre.m In release with VS Debugger attached. No Char Display to test deployed.

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All of a sudden scardinale’s numbers seem suspicious…

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He’s been running it under debugger.

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Here’s the proof. Release Build with Debugger Attached and Deployed.

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What do you get w/o the debugger attached?

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The first image is with VS Debugger Attached as Release Build and the second image is deployed as release build. Both clock in at 1 min 8 seconds.

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Hmmm… Something still doesn’t compute. GHI, are you going to repeat this test?

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What’s the “overdrive” setting? Is it a method to overclock?

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@ mhectorgato - Yes it is to overclock. Info comes from this doc. https://www.ghielectronics.com/docs/38/g120hdr-developer

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Just realize that shift left zero (emcclksel.ClearBits(1 << 0) is useless :wink:

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1<<0 is useless but clearer coding.

1<<15 is to get the sixteenth bit (starting at zero) and 1<<0 is to mark the first bit.

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