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To: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
From: Peter Tschipper <peter.tschipper@gmail.com>
Message-ID: <565A89F4.6070706@gmail.com>
Date: Sat, 28 Nov 2015 21:15:32 -0800
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Subject: Re: [bitcoin-dev] further test results for : "Datastream
Compression of Blocks and Tx's"
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yes, you're right, it's just the percentage compressed (size reduction)
On 28/11/2015 4:30 PM, Jonathan Toomim wrote:
> It appears you're using the term "compression ratio" to mean "size
> reduction". A compression ratio is the ratio (compressed /
> uncompressed). A 1 kB file compressed with a 10% compression ratio
> would be 0.1 kB. It seems you're using (1 - compressed/uncompressed),
> meaning that the compressed file would be 0.9 kB.
>
> On Nov 28, 2015, at 6:48 AM, Peter Tschipper via bitcoin-dev
> <bitcoin-dev@lists.linuxfoundation.org
> <mailto:bitcoin-dev@lists.linuxfoundation.org>> wrote:
>
>> The following show the compression ratio acheived for various sizes
>> of data. Zlib is the clear
>> winner for compressibility, with LZOx-999 coming close but at a cost.
>>
>> range Zlib-1 cmp%
>> Zlib-6 cmp% LZOx-1 cmp% LZOx-999 cmp%
>> 0-250b 12.44 12.86 10.79 14.34
>> 250-500b 19.33 12.97 10.34 11.11
>>
>>
>>
>>
>>
>>
>
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<div class="moz-cite-prefix">yes, you're right, it's just the
percentage compressed (size reduction)<br>
<br>
On 28/11/2015 4:30 PM, Jonathan Toomim wrote:<br>
</div>
<blockquote cite="mid:725E6BCC-E839-4F91-9BCA-95D0549DC3C7@toom.im"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
It appears you're using the term "compression ratio" to mean "size
reduction". A compression ratio is the ratio (compressed /
uncompressed). A 1 kB file compressed with a 10% compression ratio
would be 0.1 kB. It seems you're using (1 -
compressed/uncompressed), meaning that the compressed file would
be 0.9 kB.
<div><br>
</div>
<div>
<div>
<div>
<div>On Nov 28, 2015, at 6:48 AM, Peter Tschipper via
bitcoin-dev <<a moz-do-not-send="true"
href="mailto:bitcoin-dev@lists.linuxfoundation.org">bitcoin-dev@lists.linuxfoundation.org</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
<div bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">The following show the
compression ratio acheived for various sizes of data.
Zlib is the clear<br>
winner for compressibility, with LZOx-999 coming close
but at a cost.<br>
<br>
<table x:str="" style="border-collapse: collapse;
width: 457pt; position: static; z-index: auto;"
border="0" width="608" cellpadding="0"
cellspacing="0">
<colgroup><col
style="mso-width-source:userset;mso-width-alt:8850;width:182pt"
width="242"> <col
style="mso-width-source:userset;mso-width-alt:2998;width:62pt"
width="82"> <col
style="mso-width-source:userset;mso-width-alt:3986;width:82pt"
width="109"> <col
style="mso-width-source:userset;mso-width-alt:4059;width:83pt"
width="111"> <col style="width:48pt" width="64">
</colgroup><tbody>
<tr style="height:12.75pt" height="17">
<td style="height:12.75pt;width:182pt"
height="17" width="242">range</td>
<td style="width:62pt" width="82">Zlib-1 cmp%<br>
</td>
<td style="width:82pt" width="109">Zlib-6 cmp%</td>
<td style="width:83pt" width="111">LZOx-1 cmp%</td>
<td style="width:48pt" width="64">LZOx-999 cmp%</td>
</tr>
<tr style="height:12.75pt" height="17">
<td style="height:12.75pt" height="17">0-250b</td>
<td class="xl22" x:num="">12.44</td>
<td class="xl22" x:num="">12.86</td>
<td class="xl22" x:num="">10.79</td>
<td class="xl22" x:num="">14.34</td>
</tr>
<tr style="height:12.75pt" height="17">
<td style="height:12.75pt" x:str="250-500b "
height="17">250-500b<span
style="mso-spacerun:yes"> </span></td>
<td class="xl22" x:num="">19.33</td>
<td class="xl22" x:num="">12.97</td>
<td class="xl22" x:num="">10.34</td>
<td class="xl22" x:num="">11.11</td>
</tr>
<tr style="height:12.75pt" height="17">
<td style="height:12.75pt" height="17"><br>
</td>
<td class="xl22" x:num=""><br>
</td>
<td class="xl22"><br>
</td>
<td class="xl22" x:num=""><br>
</td>
<td class="xl22" x:num=""><br>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</blockquote>
</div>
<br>
</div>
</div>
</blockquote>
<br>
</body>
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