When to use the constant memory?

[jesusgumbau]

I was told to use texture memory whenever it’s possible to speedup my fetches by using the data cache. However, cosntant memory accesses are also cached. So my question is: how do I decide to use one type or another (texture or constant memory)?

Greetings.

[AndreiB]

If each thread within warp reads same memory location (or maybe two different locations per warp) then use constant memory. Otherwise it’s better to experiment a bit, but texture cache is likely to be faster.