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From: Jonathan Toomim <j@toom.im>
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To: Peter Tschipper <peter.tschipper@gmail.com>
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Cc: bitcoin-dev@lists.linuxfoundation.org
Subject: Re: [bitcoin-dev] further test results for : "Datastream
Compression of Blocks and Tx's"
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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> 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.
>=20
> 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
>=20
>=20
>=20
>=20
>=20
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<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">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 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=UTF-8" 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></body></html>
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