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Mobile, Graphics, and Gaming forum Mali offline compiler - L/S cycles meaning

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Mali offline compiler - L/S cycles meaning

JPJ over 5 years ago

Hi,

It's slightly unclear to me what the L/S cycles reported refer to. Since malioc is not taking into account memory-latency, etc.. are those cycles just related with the number of instructions issued to fetch attribute data and store the pre-interpolated varying results?

e.g.

                               A      LS       T    Bound
Total instruction cycles:   20.60   35.00    0.00       LS
Shortest path cycles:       16.60   29.00    0.00       LS
Longest path cycles:          N/A     N/A     N/A      N/A

Cheers

Top replies

Peter Harris over 5 years ago +1 verified

Hi JPJ, The aim is that it report architectural throughput for the Load/Store pipeline, so number of active cycles doing useful work. In terms of what it counts: For Midgard family GPUs the LS...
Peter Harris over 5 years ago in reply to JPJ +1

"Architectural throughput" is just the processing cost of "doing" the instruction. Most of the time the GPU can hide misses and fetch latency - we have other things to run in parallel - so that's all ignored...