Question about memory copy bandwidth

[NovaTitan]

Hi guys,

Is there any way to run memory read/write ratio to 1:1, 2:1, and 3:1? Or memory read-only write-only?

Additionally, can I set an option like memory as sequential access or random access for the memory copy bandwidth test?

Thank you for your advice in advance.

[Nick Sanders]

Unfortunately stressapptest can't currently do these things. It would be a neat feature to have read/check threads available, and I'll try to look into adding them at some point. 

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[NovaTitan]

Thanks a lot for your reply. By the way, it describes "-W" option as "FPU warms CPU while copying". It increases memory bandwidth, do you know how it works or any other detail info?

[Nick Sanders]

On Tue, Nov 29, 2022 at 10:30 AM NovaTitan <novat...@gmail.com> wrote:

Thanks a lot for your reply. By the way, it describes "-W" option as "FPU warms CPU while copying". It increases memory bandwidth, do you know how it works or any other detail info?

Depending on the system, "-W" will use SSE/Neon/vector to accelerate memory copy, which is probably what you have. If no vector instructions are available, it will linterleave floating point calculations with memory copy.