Access to CUDA Shared memory from the host

Accelerated Computing CUDA CUDA Programming and Performance
1

Is it possible to access CUDA shared memory directly from the host?

2

Not possible. It is only accessible from CUDA device code.

3

And not reliable to count on the content of shared memory from kernel to kernel, right?

4

correct. Shared memory is not even visible from one threadblock to the next. Each threadblock in a kernel has its own logical shared memory array.

5

If you want to extend the lifetime of shared memory, use fewer blocks and do more work in each of them. But be aware of occupancy - fewer blocks might not fill the entire GPU anymore.