Community: Math help

[vallard]

I'm trying to understand the resources readme where it shows equivalent values. There is a sentence that says:

"For example, the following represent roughly the same value: 128974848, "129e6", "129M" , "123Mi"."

Can you help me understand the 123Mi? I thought it would be 128974848 / 1024 = 126Mi instead of 123Mi? I'd like to at least update the docs so its more clear if I can.

Thanks for any clarification /sig docs

[vallard]

/sig docs

[idealhack]

128974848 / 1024 / 1024 = 123

[vallard]

ah, that explains. So slowly:
128974848 bytes = 125,952 kilobytes = 123 megabytes correct?

Thank you!

[pcarver]

Well, to be really accurate, 128,974,848 bytes = 125,952 kibibytes = 123 mebibytes

kibi = 2^10 = 1024, mebi = 2^20 = 1048576
kilo = 10^3 = 1000, mega=10^6 = 1000000

For 10^3 vs 2^10 the error is fairly small, but the discrepancy grows with every increase in the exponent, so just ignoring the distinction between powers of 2 vs powers of 10 isn’t really a good idea anywhere that accuracy matters.

--
Paul Carver
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h=6.626 070 15 × 10-34
e=1.602176634 × 10-19
k= 1.380649 × 10-23
NA=6.02214076 x 1023

From: Vallard Benincosa [e-mail]
Sent: Saturday, November 17, 2018 10:38
To: kubernetes/community [e-mail]
Cc: Subscribed [e-mail]
Subject: Re: [kubernetes/community] Math help (#2948)

ah, that explains. So slowly:
128974848 bytes = 125,952 kilobytes = 123 megabytes correct?

Thank you!

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[idealhack]

@pcarver we have M and Mi