Pine64 Cluster economy
#3
(05-09-2016, 04:56 AM)tkaiser Wrote:
(05-07-2016, 06:05 PM)baryluk Wrote: Pine64 (sun50iw1p1), 2GB RAM  (with small heatsink): (using 4 threads)

Without telling throttling behaviour unfortunately all performance numbers are somewhat irrelevant. You should keep in mind that if you want performance 'small heatsink' isn't enough. Using appropriate heatsinks, intelligent assembly and only 2 120mm fans with controlled airflow Pine64+ might easily run 30%-40% faster.

Unless you run longsleep's pine64_health.sh script in parallel or install RPi-Monitor (easy on any Debian based image) you just produce numbers without meaning. Another fatal issue is using the wrong OS images (like eg. the featured Xubuntu rip-off the Pine64 folks provide) since without at least passive monitoring you don't get how background tasks might negatively influence the benchmark you're currently running.

This is Xubuntu's screensaver starting after an hour on an absolutely idle Pine64:

[Image: Bildschirmfoto%202016-05-03%20um%2017.44.12.png]

The screensaver alone is that CPU intensive that SoC temperature reaches 90°C, cooling state 4 and throttling down to 960MHz happened. And this screensaver also starts when you run benchmarks unattended through SSH since it only checks for keyboard/mouse interaction. Benchmarking without monitoring always produces only numbers without meaning.

TL;DR: The numbers provided are questionable, using monitoring and better heat dissipation the efficiency can be improved most probably by 30% or even more.

There was no throttling during benchmark. I know how to do benchmarks. I do have 15 years of experience in that matter.

It was ~65 C all the time, and never below 1.15GHz. With better cooling you might get few percent improvement. Nothing to change whole picture.

Your comments are without meaning, and full of assumptions. If you are that smart, why you not run some comparison instead?

Also you totally missed the point about the economy part. Adding 2 120 fans and will easily make it failed project due to crossing the cost threshold I stated in the post.
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Messages In This Thread
Pine64 Cluster economy - by baryluk - 05-07-2016, 06:05 PM
RE: Pine64 Cluster economy - by tkaiser - 05-09-2016, 04:56 AM
RE: Pine64 Cluster economy - by baryluk - 05-17-2016, 03:26 PM
RE: Pine64 Cluster economy - by tkaiser - 05-18-2016, 08:53 AM
RE: Pine64 Cluster economy - by tkaiser - 05-19-2016, 03:58 AM
RE: Pine64 Cluster economy - by JasperBrown - 06-19-2016, 09:13 AM

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