CODEWITHSUNDEEP
memorycudametricsthroughput
troore
troore

Reputation: 797

What's the difference between "gld/st_throughput" and "dram_read/write_throughput" metrics?

In the CUDA visual profiler, version 5, I know that the "gld/st_requested_throughput" are the requested memory throughput of application. However, when I try to find the actual throughput of hardware, I am confused because there are two pairs of metrics which seem to be qualified, and they are "gld/st_throughput" and "dram_read/write_throughput". Which pair is actually the hardware throughput? And what does the other serve as?

Upvotes: 2

Views: 576

Answers (1)

Roger Dahl
Roger Dahl

Reputation: 15734

gld/st_throughput includes transactions served by the L1 and L2 caches. While dram_read/write_throughput is the throughput between L2 and device memory. So, each global memory access counts towards gld/st_throughput but only requests that missed both the L1 and L2 caches count towards dram_read/write_throughput.

I haven't found a good overview of the counters anywhere. Wish NVIDIA would provide that...

Upvotes: 2

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