Detailed concept for blocks and threads

Accelerated Computing Teaching and Curriculum Support
1

Dear all,

Please any tutorial where in detail with example I’ll find threads and blocks cooperation.
For example in odd even sort algorithm there is different sorting time:

N=1024
blocks=1
threads=1
sorting time= 0.038ms

N=1024
blocks =1
thread=2
sorting time= 0.038ms

N=1024
blocks =1
thread=512
sorting time= 0.038ms

Why the sorting time is not less with higher number of threads ???

2

E.g. [url]nvidia - Understanding CUDA grid dimensions, block dimensions and threads organization (simple explanation) - Stack Overflow