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androidperformancelibgdxandroid-7.0-nougatnexus-6p

Slow code on Nexus 6P

I'm developing an android app, in which I need to initialize float array. I have this code:

private float[] verticesArray;
private int vertexPosition = 0;

public void addVertexAttribute(float attribute) {
    verticesArray[vertexPosition++] = attribute;
}

And when I run this code on my test devices - I got strange results: calling addVertexAttribute 30 times on Nexus 6P took 75000 nanoseconds, on HTC one x - 15000 nanoseconds, HTC desire C - 70000 nanoseconds. So, why is it 5x times slower on the most powerful device?

My Nexus 6P is on nougat 7.1.1, rooted. HTC One X is 4.1.1, rooted. HTC Desire C - 4.0.1, not-rooted.

Also, I'm using libgdx framework and this is a mesh initialization.

Solution

  • It's because Nexus 6+ devices has data encryption.

    Encrypted vs. Decrypted Benchmarks