New subject: benchmark

31 Mar 2000

      Oh brother..
asked and answered..
"Each vendor will have to be asked what method they use in the real world."
The answer is "ask them.."
Subject Closed.
...
-----Original Message-----
From:	Jay Orr [SMTP:orrjl@stl.nexen.com]
Sent:	Friday, March 31, 2000 7:30 AM
To:	Paquette, Trevor
Cc:	Karl Swartz; toasters@mathworks.com
Subject:	RE: benchmark
Yes, and THAT WAS MY ORIGINAL QUESTION THAT YOU RESPONDED TO  - what do
Netapps and Sun do?
On Thu, 30 Mar 2000, Paquette, Trevor wrote:
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Each vendor either sticks with powers of 2 (as they should) or they
round
...
it.
Each vendor will have to be asked what method they use in the real
world.
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Yes, we all know the theory, but I'm talking real world. As the
thread reads, some vendors use 1000 KB = 1MB, while some don't. I am
asking what is implemented. Do the majority of the unix vendors adhere
to
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the proper base 2 theory of metrics or do they use base 10 combos
(i.e. the 1GB = 1000 MB)?
On Thu, 30 Mar 2000, Paquette, Trevor wrote:
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Here we go..
A bit is the smallest unit of data in a computer; has a single
binary
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value
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of either 0 or 1
A byte is a unit of information that is eight bits long. (half a
byte,
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or 4
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bits is called a nibble)
Computer storage is measured in byte multiples; which are based on
powers of
...

Because humans deal mainly with the decimal system, the resulting
number
...
...
is
...
usually 'rounded off'
for humans to better comprehend.
1 Kbyte    = 1024  bytes = 2^10 bytes =                     1,024
bytes
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1 Megabyte = 1024 Kbytes = 2^20 bytes =                 1,048,576
bytes
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1 Gigabyte = 1024 Mbytes = 2^30 bytes =             1,073,741,824
bytes
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...
...
1 Terabyte = 1024 Gbytes = 2^40 bytes =         1,099,511,627,776
bytes
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1 Petabyte = 1024 Tbytes = 2^50 bytes =     1,125,899,906,842,624
bytes
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1 Exabyte  = 1024 Pbytes = 2^60 bytes = 1,152,921,504,606,846,976
bytes
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= approx. 1 billion GB
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Humm... Fun.. Do you know off hand how Solaris and netapp defines
a MB
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or
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GB? In moving around files I started thinking about this, since
depending
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on what tool you use you get file sizes in "bytes" "kbytes" "MB"
or
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"GB"
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(a la gnu df, solaris df, etc...)
On Wed, 29 Mar 2000, Karl Swartz wrote:
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> Uh, if I can ask a simple (stupid?) question - I was looking
at
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the
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source
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> code for postmark and noticed this :
> 
> #define KILOBYTE 1024
> #define MEGABYTE (1000*KILOBYTE)
> 
> Isn't a megabite 1024*1024?
It depends on who you ask.  Long ago, disk vendors decided that
they
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...
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could make their disks look bigger if they defined MB to be 2000
sectors (assuming 512 byte sectors, or 8000 sectors for 128 byte
sectors), and GB became 1000 MB.  Of course they also talked
about
...
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...
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unformatted capacity to further inflate the size over reality.
In a similar vein, telco people talk about 1K = 1000.  The 64K
B-
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channel in an ISDN line is 64000 bits per second, not 65536.
I'm not sure about networking, but I think FDDI and 100base-T
both
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have a data rate of 100 * 10^6 bits/second, not 100 * 2^20.
(Not to
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be
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confused with the signalling rate, which as I recall is 125 *
10^6
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for
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FDDI with some flavor of 4/5 encoding, and possibly something
similar
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for 100base-T.)
What's right for Postmark?  Good question.  It looks like Jeff
picked
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the standard for disk sizes, but it's not clear that's the
standard
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most applicable to this case.  Aren't standards wonderful?  :-)
--
Karl Swartz		Network Appliance Engineering
Work: kls@netapp.com	http://www.netapp.com/
Home: kls@chicago.com	http://www.chicago.com/~kls/

Jay Orr  
Systems Administrator
Fujitsu  Nexion Inc.
St. Louis, MO

RE: benchmark

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