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some questions about the data #17

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cighao opened this issue Jul 28, 2020 · 2 comments
Open

some questions about the data #17

cighao opened this issue Jul 28, 2020 · 2 comments

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@cighao
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cighao commented Jul 28, 2020

Hi. It's a very nice website. But I have some questions about the data.
On the website,
"read 1000,000 bytes sequentially from memory is 3us", so the memory bandwidth should be 1MB/3us = 333GB/s.
"read 1000,000 bytes sequentially from SSD is 49us", so the SSD bandwidth should be 1MB/49us = 20GB/s.
"read 1000,000 bytes sequentially from disk is 825us", so the disk bandwidth should be 1MB/815us = 1.2GB/s.
From my point of view, these data are much bigger than the real products' performance.

@RemiTorracinta
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It looks like the numbers are currently projections from 2012???

Here are some reasonable bandwidth numbers:
https://www.forrestthewoods.com/blog/memory-bandwidth-napkin-math/

@colin-scott
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That's correct, I created this in 2012 ;-)

Happy to accept pull requests for updated models

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