The first paper mentions system balance. The ratio of IO bandwidth to
bandwidths at other levels of the memory hierarchy is often looked at,
(sometimes also to floating point operations). File systems are
typically shared, so some care may be needed in attributing performance
on a file system to a single computer.
Regards,
Benson
On 8/10/19 7:37 PM, Patrick Farrell via IO-500 wrote:
Puneet,
I am familiar with Amdahl’s Law, but I am not familiar with Amdahl IO
and cannot find anything with Google. Do you have a reference for
this, explaining how it’s computed and what it’s supposed to mean? It
is hard to see how the Amdahl’s Law - that speed up from parallelism
is limited by the serial portion of a program - has any relationship
to the I/O 500 benchmarks, which are concerned with a series of
specific and separate benchmarks. The various benchmark numbers are
not part of a single parallel program, and so do not have the sort of
relationship where Amdahl’s Law is relevant.
Regards,
Patrick
------------------------------------------------------------------------
*From:* IO-500 <io-500-bounces(a)vi4io.org> on behalf of Puneet Bakshi
via IO-500 <io-500(a)vi4io.org>
*Sent:* Friday, August 9, 2019 11:11:47 PM
*To:* io-500(a)vi4io.org <io-500(a)vi4io.org>
*Subject:* [IO-500] Why "Amdahl IO no" is not part of IO500 metric?
Dear Sir/Madam,
I am Puneet from India and is a student in Indian Institute of
Technology Guwahati.
I read about IO500 and (Amdahl) Balanced Systems (such as GrayWulf).
But, after doing some math, I found some of the top IO500 systems
have very low Amdahl IO number. Why IO500 does not include (and
publish) Amdahl IO number as one of its metric? Looks like I am
missing something but I do not know what. Please help me understand
this paradox. This question just came out as an academic curiosity and
not to endorse or refute any system. Please help me understand more.
Regards,
Puneet
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