Use performance of computers and smartphones

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Ray

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Joined: 26 Aug 22
Posts: 1
Message 109700 - Posted: 26 Aug 2022, 22:14:59 UTC

Hello.
I tried BOINC on my unused smartphone (Samsung Galaxy S7).
I saw the result like below.

https://universeathome.pl/universe/host_app_versions.php?hostid=631467

In the result page, the average processing rate is just 0.22 GFLOPS.
As I know, the computing power of Samsung Galaxy S7 is around 260 GFlops.

Who can explain why real processing rate is 0.22 GFlops instead of 260 GFlops?
If you explain about this matter, I will grateful you.

Thank you.


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Profile Jord
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Joined: 29 Aug 05
Posts: 15189
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Message 109702 - Posted: 26 Aug 2022, 23:01:31 UTC - in response to Message 109700.  

Well, your CPU has 8 cores, 4 of which are the so-called LITTLE cores which are used for more mundane calculations, and which BOINC will use. It has 4 more big cores (from big.LITTLE) which are faster and used only by Android. When you allow BOINC to use 8 cores, it runs the tasks on 4 cores, on the slower LITTLE ones and double loads tasks onto those cores (2 per core).

Running 2 tasks per core slows things down already.

Then I looked up benchmarks of the Galaxy S7 and see for floating point operations that it runs between 1.43 and 4.08 GFlops on a single core (there are multicore numbers there too), depending on which calculation was run. You can compare it to those numbers as each Universe BHspin v2 0.21 arm-android-linux-gnu task should run on a single core only.

So, set preferences correctly to use just 4 cores, and rerun the calculations and see if they differ much from the previous double loaded values. Running single tasks should run much faster.
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Message boards : Questions and problems : Use performance of computers and smartphones

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