Mercurial > hg
view tests/test-hgweb-filelog.t @ 30442:41a8106789ca
util: implement zstd compression engine
Now that zstd is vendored and being built (in some configurations), we
can implement a compression engine for zstd!
The zstd engine is a little different from existing engines. Because
it may not always be present, we have to defer load the module in case
importing it fails. We facilitate this via a cached property that holds
a reference to the module or None. The "available" method is
implemented to reflect reality.
The zstd engine declares its ability to handle bundles using the
"zstd" human name and the "ZS" internal name. The latter was chosen
because internal names are 2 characters (by only convention I think)
and "ZS" seems reasonable.
The engine, like others, supports specifying the compression level.
However, there are no consumers of this API that yet pass in that
argument. I have plans to change that, so stay tuned.
Since all we need to do to support bundle generation with a new
compression engine is implement and register the compression engine,
bundle generation with zstd "just works!" Tests demonstrating this
have been added.
How does performance of zstd for bundle generation compare? On the
mozilla-unified repo, `hg bundle --all -t <engine>-v2` yields the
following on my i7-6700K on Linux:
engine CPU time bundle size vs orig size throughput
none 97.0s 4,054,405,584 100.0% 41.8 MB/s
bzip2 (l=9) 393.6s 975,343,098 24.0% 10.3 MB/s
gzip (l=6) 184.0s 1,140,533,074 28.1% 22.0 MB/s
zstd (l=1) 108.2s 1,119,434,718 27.6% 37.5 MB/s
zstd (l=2) 111.3s 1,078,328,002 26.6% 36.4 MB/s
zstd (l=3) 113.7s 1,011,823,727 25.0% 35.7 MB/s
zstd (l=4) 116.0s 1,008,965,888 24.9% 35.0 MB/s
zstd (l=5) 121.0s 977,203,148 24.1% 33.5 MB/s
zstd (l=6) 131.7s 927,360,198 22.9% 30.8 MB/s
zstd (l=7) 139.0s 912,808,505 22.5% 29.2 MB/s
zstd (l=12) 198.1s 854,527,714 21.1% 20.5 MB/s
zstd (l=18) 681.6s 789,750,690 19.5% 5.9 MB/s
On compression, zstd for bundle generation delivers:
* better compression than gzip with significantly less CPU utilization
* better than bzip2 compression ratios while still being significantly
faster than gzip
* ability to aggressively tune compression level to achieve
significantly smaller bundles
That last point is important. With clone bundles, a server can
pre-generate a bundle file, upload it to a static file server, and
redirect clients to transparently download it during clone. The server
could choose to produce a zstd bundle with the highest compression
settings possible. This would take a very long time - a magnitude
longer than a typical zstd bundle generation - but the result would
be hundreds of megabytes smaller! For the clone volume we do at
Mozilla, this could translate to petabytes of bandwidth savings
per year and faster clones (due to smaller transfer size).
I don't have detailed numbers to report on decompression. However,
zstd decompression is fast: >1 GB/s output throughput on this machine,
even through the Python bindings. And it can do that regardless of the
compression level of the input. By the time you have enough data to
worry about overhead of decompression, you have plenty of other things
to worry about performance wise.
zstd is wins all around. I can't wait to implement support for it
on the wire protocol and in revlogs.
| author | Gregory Szorc <gregory.szorc@gmail.com> |
|---|---|
| date | Fri, 11 Nov 2016 01:10:07 -0800 |
| parents | c42a3fd5c1fc |
| children | 7817df5585db |
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#require serve $ hg init test $ cd test $ echo b > b $ hg ci -Am "b" adding b $ echo a > a $ hg ci -Am "first a" adding a $ hg tag -r 1 a-tag $ hg bookmark -r 1 a-bookmark $ hg rm a $ hg ci -m "del a" $ hg branch a-branch marked working directory as branch a-branch (branches are permanent and global, did you want a bookmark?) $ echo b > a $ hg ci -Am "second a" adding a $ hg rm a $ hg ci -m "del2 a" $ hg mv b c $ hg ci -m "mv b" $ echo c >> c $ hg ci -m "change c" $ hg log -p changeset: 7:46c1a66bd8fc branch: a-branch tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: change c diff -r c9637d3cc8ef -r 46c1a66bd8fc c --- a/c Thu Jan 01 00:00:00 1970 +0000 +++ b/c Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +1,2 @@ b +c changeset: 6:c9637d3cc8ef branch: a-branch user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: mv b diff -r 958bd88be4eb -r c9637d3cc8ef b --- a/b Thu Jan 01 00:00:00 1970 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ -b diff -r 958bd88be4eb -r c9637d3cc8ef c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/c Thu Jan 01 00:00:00 1970 +0000 @@ -0,0 +1,1 @@ +b changeset: 5:958bd88be4eb branch: a-branch user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: del2 a diff -r 3f41bc784e7e -r 958bd88be4eb a --- a/a Thu Jan 01 00:00:00 1970 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ -b changeset: 4:3f41bc784e7e branch: a-branch user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: second a diff -r 292258f86fdf -r 3f41bc784e7e a --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/a Thu Jan 01 00:00:00 1970 +0000 @@ -0,0 +1,1 @@ +b changeset: 3:292258f86fdf user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: del a diff -r 94c9dd5ca9b4 -r 292258f86fdf a --- a/a Thu Jan 01 00:00:00 1970 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ -a changeset: 2:94c9dd5ca9b4 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: Added tag a-tag for changeset 5ed941583260 diff -r 5ed941583260 -r 94c9dd5ca9b4 .hgtags --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.hgtags Thu Jan 01 00:00:00 1970 +0000 @@ -0,0 +1,1 @@ +5ed941583260248620985524192fdc382ef57c36 a-tag changeset: 1:5ed941583260 bookmark: a-bookmark tag: a-tag user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: first a diff -r 6563da9dcf87 -r 5ed941583260 a --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/a Thu Jan 01 00:00:00 1970 +0000 @@ -0,0 +1,1 @@ +a changeset: 0:6563da9dcf87 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: b diff -r 000000000000 -r 6563da9dcf87 b --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/b Thu Jan 01 00:00:00 1970 +0000 @@ -0,0 +1,1 @@ +b $ hg serve -n test -p $HGPORT -d --pid-file=hg.pid -E errors.log $ cat hg.pid >> $DAEMON_PIDS tip - two revisions $ (get-with-headers.py localhost:$HGPORT 'log/tip/a') 200 Script output follows <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US"> <head> <link rel="icon" href="/static/hgicon.png" type="image/png" /> <meta name="robots" content="index, nofollow" /> <link rel="stylesheet" href="/static/style-paper.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: a history</title> <link rel="alternate" type="application/atom+xml" href="/atom-log/tip/a" title="Atom feed for test:a" /> <link rel="alternate" type="application/rss+xml" href="/rss-log/tip/a" title="RSS feed for test:a" /> </head> <body> <div class="container"> <div class="menu"> <div class="logo"> <a href="https://mercurial-scm.org/"> <img src="/static/hglogo.png" alt="mercurial" /></a> </div> <ul> <li><a href="/shortlog/tip">log</a></li> <li><a href="/graph/tip">graph</a></li> <li><a href="/tags">tags</a></li> <li><a href="/bookmarks">bookmarks</a></li> <li><a href="/branches">branches</a></li> </ul> <ul> <li><a href="/rev/tip">changeset</a></li> <li><a href="/file/tip">browse</a></li> </ul> <ul> <li><a href="/file/tip/a">file</a></li> <li><a href="/diff/tip/a">diff</a></li> <li><a href="/comparison/tip/a">comparison</a></li> <li><a href="/annotate/tip/a">annotate</a></li> <li class="active">file log</li> <li><a href="/raw-file/tip/a">raw</a></li> </ul> <ul> <li><a href="/help">help</a></li> </ul> <div class="atom-logo"> <a href="/atom-log/tip/a" title="subscribe to atom feed"> <img class="atom-logo" src="/static/feed-icon-14x14.png" alt="atom feed" /> </a> </div> </div> <div class="main"> <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2> <h3> log a @ 4:<a href="/rev/3f41bc784e7e">3f41bc784e7e</a> <span class="branchname">a-branch</span> </h3> <form class="search" action="/log"> <p><input name="rev" id="search1" type="text" size="30" /></p> <div id="hint">Find changesets by keywords (author, files, the commit message), revision number or hash, or <a href="/help/revsets">revset expression</a>.</div> </form> <div class="navigate"> <a href="/log/tip/a?revcount=30">less</a> <a href="/log/tip/a?revcount=120">more</a> | <a href="/log/5ed941583260/a">(0)</a> <a href="/log/tip/a">tip</a> </div> <table class="bigtable"> <thead> <tr> <th class="age">age</th> <th class="author">author</th> <th class="description">description</th> </tr> </thead> <tbody class="stripes2"> <tr> <td class="age">Thu, 01 Jan 1970 00:00:00 +0000</td> <td class="author">test</td> <td class="description"> <a href="/rev/3f41bc784e7e">second a</a> <span class="branchname">a-branch</span> </td> </tr> <tr> <td class="age">Thu, 01 Jan 1970 00:00:00 +0000</td> <td class="author">test</td> <td class="description"> <a href="/rev/5ed941583260">first a</a> <span class="tag">a-tag</span> <span class="tag">a-bookmark</span> </td> </tr> </tbody> </table> <div class="navigate"> <a href="/log/tip/a?revcount=30">less</a> <a href="/log/tip/a?revcount=120">more</a> | <a href="/log/5ed941583260/a">(0)</a> <a href="/log/tip/a">tip</a> </div> </div> </div> <script type="text/javascript">process_dates()</script> </body> </html> second version - two revisions $ (get-with-headers.py localhost:$HGPORT 'log/4/a') 200 Script output follows <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US"> <head> <link rel="icon" href="/static/hgicon.png" type="image/png" /> <meta name="robots" content="index, nofollow" /> <link rel="stylesheet" href="/static/style-paper.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: a history</title> <link rel="alternate" type="application/atom+xml" href="/atom-log/tip/a" title="Atom feed for test:a" /> <link rel="alternate" type="application/rss+xml" href="/rss-log/tip/a" title="RSS feed for test:a" /> </head> <body> <div class="container"> <div class="menu"> <div class="logo"> <a href="https://mercurial-scm.org/"> <img src="/static/hglogo.png" alt="mercurial" /></a> 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<p><input name="rev" id="search1" type="text" size="30" /></p> <div id="hint">Find changesets by keywords (author, files, the commit message), revision number or hash, or <a href="/help/revsets">revset expression</a>.</div> </form> <div class="navigate"> <a href="/log/4/a?revcount=30">less</a> <a href="/log/4/a?revcount=120">more</a> | <a href="/log/5ed941583260/a">(0)</a> <a href="/log/tip/a">tip</a> </div> <table class="bigtable"> <thead> <tr> <th class="age">age</th> <th class="author">author</th> <th class="description">description</th> </tr> </thead> <tbody class="stripes2"> <tr> <td class="age">Thu, 01 Jan 1970 00:00:00 +0000</td> <td class="author">test</td> <td class="description"> <a href="/rev/3f41bc784e7e">second a</a> <span class="branchname">a-branch</span> </td> </tr> <tr> <td class="age">Thu, 01 Jan 1970 00:00:00 +0000</td> <td class="author">test</td> <td class="description"> <a href="/rev/5ed941583260">first a</a> <span class="tag">a-tag</span> <span class="tag">a-bookmark</span> </td> </tr> </tbody> </table> <div class="navigate"> <a href="/log/4/a?revcount=30">less</a> <a href="/log/4/a?revcount=120">more</a> | <a href="/log/5ed941583260/a">(0)</a> <a href="/log/tip/a">tip</a> </div> </div> </div> <script type="text/javascript">process_dates()</script> </body> </html> first deleted - one revision $ (get-with-headers.py localhost:$HGPORT 'log/3/a') 200 Script output follows <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US"> <head> <link rel="icon" href="/static/hgicon.png" type="image/png" /> <meta name="robots" content="index, nofollow" /> <link rel="stylesheet" href="/static/style-paper.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: a history</title> <link rel="alternate" type="application/atom+xml" href="/atom-log/tip/a" title="Atom feed for test:a" /> <link 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class="description"> <a href="/rev/5ed941583260">first a</a> <span class="tag">a-tag</span> <span class="tag">a-bookmark</span> </td> </tr> </tbody> </table> <div class="navigate"> <a href="/log/3/a?revcount=30">less</a> <a href="/log/3/a?revcount=120">more</a> | <a href="/log/5ed941583260/a">(0)</a> <a href="/log/tip/a">tip</a> </div> </div> </div> <script type="text/javascript">process_dates()</script> </body> </html> first version - one revision $ (get-with-headers.py localhost:$HGPORT 'log/1/a') 200 Script output follows <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US"> <head> <link rel="icon" href="/static/hgicon.png" type="image/png" /> <meta name="robots" content="index, nofollow" /> <link rel="stylesheet" href="/static/style-paper.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: a history</title> <link 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class="age">Thu, 01 Jan 1970 00:00:00 +0000</td> <td class="author">test</td> <td class="description"> <a href="/rev/5ed941583260">first a</a> <span class="tag">a-tag</span> <span class="tag">a-bookmark</span> </td> </tr> </tbody> </table> <div class="navigate"> <a href="/log/1/a?revcount=30">less</a> <a href="/log/1/a?revcount=120">more</a> | <a href="/log/5ed941583260/a">(0)</a> <a href="/log/tip/a">tip</a> </div> </div> </div> <script type="text/javascript">process_dates()</script> </body> </html> before addition - error $ (get-with-headers.py localhost:$HGPORT 'log/0/a') 404 Not Found <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US"> <head> <link rel="icon" href="/static/hgicon.png" type="image/png" /> <meta name="robots" content="index, nofollow" /> <link rel="stylesheet" href="/static/style-paper.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: error</title> </head> <body> <div class="container"> <div class="menu"> <div class="logo"> <a href="https://mercurial-scm.org/"> <img src="/static/hglogo.png" width=75 height=90 border=0 alt="mercurial" /></a> </div> <ul> <li><a href="/shortlog">log</a></li> <li><a href="/graph">graph</a></li> <li><a href="/tags">tags</a></li> <li><a href="/bookmarks">bookmarks</a></li> <li><a href="/branches">branches</a></li> </ul> <ul> <li><a href="/help">help</a></li> </ul> </div> <div class="main"> <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2> <h3>error</h3> <form class="search" action="/log"> <p><input name="rev" id="search1" type="text" size="30"></p> <div id="hint">Find changesets by keywords (author, files, the commit message), revision number or hash, or <a href="/help/revsets">revset expression</a>.</div> </form> <div class="description"> <p> An error occurred while processing your request: </p> <p> a@6563da9dcf87: not found in manifest </p> </div> </div> </div> <script type="text/javascript">process_dates()</script> </body> </html> [1] should show base link, use spartan because it shows it $ (get-with-headers.py localhost:$HGPORT 'log/tip/c?style=spartan') 200 Script output follows <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <link rel="icon" href="/static/hgicon.png" type="image/png"> <meta name="robots" content="index, nofollow" /> <link rel="stylesheet" href="/static/style.css" type="text/css" /> <script type="text/javascript" src="/static/mercurial.js"></script> <title>test: c history</title> <link rel="alternate" type="application/atom+xml" href="/atom-log/tip/c" title="Atom feed for test:c"> <link rel="alternate" type="application/rss+xml" href="/rss-log/tip/c" title="RSS feed for test:c"> </head> <body> <div class="buttons"> <a href="/log?style=spartan">changelog</a> <a href="/shortlog?style=spartan">shortlog</a> <a href="/graph?style=spartan">graph</a> <a href="/tags?style=spartan">tags</a> <a href="/branches?style=spartan">branches</a> <a href="/file/tip/c?style=spartan">file</a> <a href="/annotate/tip/c?style=spartan">annotate</a> <a href="/help?style=spartan">help</a> <a type="application/rss+xml" href="/rss-log/tip/c">rss</a> <a type="application/atom+xml" href="/atom-log/tip/c" title="Atom feed for test:c">atom</a> </div> <h2><a href="/">Mercurial</a> / c revision history</h2> <p>navigate: <small class="navigate"><a href="/log/c9637d3cc8ef/c?style=spartan">(0)</a> <a href="/log/tip/c?style=spartan">tip</a> </small></p> <table class="logEntry parity0"> <tr> <th class="label"><span class="age">Thu, 01 Jan 1970 00:00:00 +0000</span>:</th> <th class="firstline"><a href="/rev/46c1a66bd8fc?style=spartan">change c</a></th> </tr> <tr> <th class="revision">revision 1:</th> <td class="node"> <a href="/file/46c1a66bd8fc/c?style=spartan">46c1a66bd8fc</a> <a href="/diff/46c1a66bd8fc/c?style=spartan">(diff)</a> <a href="/annotate/46c1a66bd8fc/c?style=spartan">(annotate)</a> </td> </tr> <tr> <th class="author">author:</th> <td class="author">test</td> </tr> <tr> <th class="date">date:</th> <td class="date">Thu, 01 Jan 1970 00:00:00 +0000</td> </tr> </table> <table class="logEntry parity1"> <tr> <th class="label"><span class="age">Thu, 01 Jan 1970 00:00:00 +0000</span>:</th> <th class="firstline"><a href="/rev/c9637d3cc8ef?style=spartan">mv b</a></th> </tr> <tr> <th class="revision">revision 0:</th> <td class="node"> <a href="/file/c9637d3cc8ef/c?style=spartan">c9637d3cc8ef</a> <a href="/diff/c9637d3cc8ef/c?style=spartan">(diff)</a> <a href="/annotate/c9637d3cc8ef/c?style=spartan">(annotate)</a> </td> </tr> <tr> <th>base:</th> <td> <a href="/file/1e88685f5dde/b?style=spartan"> b@1e88685f5dde </a> </td> </tr> <tr> <th class="author">author:</th> <td class="author">test</td> </tr> <tr> <th class="date">date:</th> <td class="date">Thu, 01 Jan 1970 00:00:00 +0000</td> </tr> </table> <script type="text/javascript">process_dates()</script> <div class="logo"> <a href="https://mercurial-scm.org/"> <img src="/static/hglogo.png" width=75 height=90 border=0 alt="mercurial"></a> </div> </body> </html> rss log $ (get-with-headers.py localhost:$HGPORT 'rss-log/tip/a') 200 Script output follows <?xml version="1.0" encoding="ascii"?> <rss version="2.0"> <channel> <link>http://*:$HGPORT/</link> (glob) <language>en-us</language> <title>test: a history</title> <description>a revision history</description> <item> <title>second a</title> <link>http://*:$HGPORT/log3f41bc784e7e/a</link> (glob) <description><![CDATA[second a]]></description> <author>test</author> <pubDate>Thu, 01 Jan 1970 00:00:00 +0000</pubDate> </item> <item> <title>first a</title> <link>http://*:$HGPORT/log5ed941583260/a</link> (glob) <description><![CDATA[first a]]></description> <author>test</author> <pubDate>Thu, 01 Jan 1970 00:00:00 +0000</pubDate> </item> </channel> </rss> atom log $ (get-with-headers.py localhost:$HGPORT 'atom-log/tip/a') 200 Script output follows <?xml version="1.0" encoding="ascii"?> <feed xmlns="http://www.w3.org/2005/Atom"> <id>http://*:$HGPORT/atom-log/tip/a</id> (glob) <link rel="self" href="http://*:$HGPORT/atom-log/tip/a"/> (glob) <title>test: a history</title> <updated>1970-01-01T00:00:00+00:00</updated> <entry> <title>[a-branch] second a</title> <id>http://*:$HGPORT/#changeset-3f41bc784e7e73035c6d47112c6cc7efb673adf8</id> (glob) <link href="http://*:$HGPORT/rev/3f41bc784e7e"/> (glob) <author> <name>test</name> <email>test</email> </author> <updated>1970-01-01T00:00:00+00:00</updated> <published>1970-01-01T00:00:00+00:00</published> <content type="xhtml"> <table xmlns="http://www.w3.org/1999/xhtml"> <tr> <th style="text-align:left;">changeset</th> <td>3f41bc784e7e</td> </tr> <tr> <th style="text-align:left;">branch</th> <td>a-branch</td> </tr> <tr> <th style="text-align:left;">bookmark</th> <td></td> </tr> <tr> <th style="text-align:left;">tag</th> <td></td> </tr> <tr> <th style="text-align:left;">user</th> <td>test</td> </tr> <tr> <th style="text-align:left;vertical-align:top;">description</th> <td>second a</td> </tr> <tr> <th style="text-align:left;vertical-align:top;">files</th> <td></td> </tr> </table> </content> </entry> <entry> <title>first a</title> <id>http://*:$HGPORT/#changeset-5ed941583260248620985524192fdc382ef57c36</id> (glob) <link href="http://*:$HGPORT/rev/5ed941583260"/> (glob) <author> <name>test</name> <email>test</email> </author> <updated>1970-01-01T00:00:00+00:00</updated> <published>1970-01-01T00:00:00+00:00</published> <content type="xhtml"> <table xmlns="http://www.w3.org/1999/xhtml"> <tr> <th style="text-align:left;">changeset</th> <td>5ed941583260</td> </tr> <tr> <th style="text-align:left;">branch</th> <td></td> </tr> <tr> <th style="text-align:left;">bookmark</th> <td>a-bookmark</td> </tr> <tr> <th style="text-align:left;">tag</th> <td>a-tag</td> </tr> <tr> <th style="text-align:left;">user</th> <td>test</td> </tr> <tr> <th style="text-align:left;vertical-align:top;">description</th> <td>first a</td> </tr> <tr> <th style="text-align:left;vertical-align:top;">files</th> <td></td> </tr> </table> </content> </entry> </feed> errors $ cat errors.log $ cd ..