Comment by furyofantares
2 days ago
I tried the others on my x86 machine and they all do something for me - not nearly as much as the article, but something.
2 days ago
I tried the others on my x86 machine and they all do something for me - not nearly as much as the article, but something.
The "_ [0]byte" trick has no base in my knowledge. For the author's specified example, [1024]float64 will be always allocated on one whole page, aka, always 64-byte aligned.
For "Array of Structs vs Struct of Arrays", using slices as fields is a good idea. If the purpose is to make fields allocated on their respective memory block, just use pointers instead.
> The "_ [0]byte" trick has no base in my knowledge. For the author's specified example, [1024]float64 will be always allocated on one whole page, aka, always 64-byte aligned.
You're right - I read the results I had wrong on that one. That one is slower, not faster, on both my M2 and on x86 machine.
My last comment has imprecision and misunderstanding.
> ... [1024]float64 will be always allocated on one whole page, aka, always 64-byte aligned.
if it is allocated on heap and at the start of allocated memory block.
> For "Array of Structs vs Struct of Arrays", using slices as fields is a good idea. If the purpose is to make fields allocated on their respective memory block, just use pointers instead.
I misunderstood it.
It is like row-based database vs. column-based database. Both ways have their respective advantages and disadvantages.