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terminator/doc/manual/_build/html/faq.html
Stephen Boddy 4f0c4330d2 Manual updates: 
Add the new PuTTY paste mode
  Add new Remotinator commands
  FAQ for other Terminator
  Add Bug handling flow
  Minor changes/corrections
2015-10-01 03:29:44 +02:00

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<img alt="Because curious cats ask clever code monkeys." class="align-right" src="_images/icon_faq.png" />
<div class="section" id="frequently-asked-questions">
<h1>Frequently Asked Questions<a class="headerlink" href="#frequently-asked-questions" title="Permalink to this headline"></a></h1>
<p>Here I&#8217;ll try to list some common questions that get asked for.</p>
<div class="section" id="why">
<h2>Why...<a class="headerlink" href="#why" title="Permalink to this headline"></a></h2>
<div class="section" id="is-there-another-terminal-program-called-terminator">
<h3>...is there another terminal program called Terminator?<a class="headerlink" href="#is-there-another-terminal-program-called-terminator" title="Permalink to this headline"></a></h3>
<p>There is <a class="reference external" href="https://code.google.com/p/jessies/wiki/Terminator">another terminal</a> project programmed in Java. It was begun a
bit before this project, but when this projects creator searched the
name I guess the other project did not come up. I don&#8217;t know the details,
but this project was always Terminator to me. I haven&#8217;t received
complaints from the other project, although they do get some people
asking in their Groups for support on this project. Please don&#8217;t do that
folks.</p>
<p>I have contemplated a name change, although this project has a lot of
visibility with it&#8217;s current name, and it is hard to come up with a decent
<a class="reference external" href="http://gnometerminator.blogspot.com/2015/09/whats-in-name.html">alternative</a>.</p>
</div>
<div class="section" id="write-in-python-it-s-slow-bloated-bad">
<h3>...write in Python? It&#8217;s slow/bloated/bad?<a class="headerlink" href="#write-in-python-it-s-slow-bloated-bad" title="Permalink to this headline"></a></h3>
<div class="section" id="performance">
<h4>Performance<a class="headerlink" href="#performance" title="Permalink to this headline"></a></h4>
<dl class="docutils">
<dt>Profiles were configured with command <code class="docutils literal"><span class="pre">bash</span> <span class="pre">-c</span> <span class="pre">exit</span></code>, and the</dt>
<dd>commands run a couple of times to get the caches loaded up.</dd>
</dl>
<p>GNOME-Terminal:</p>
<div class="highlight-python"><div class="highlight"><pre>time for i in {1..30} ; do gnome-terminal --profile=Quickexit; done
real 0m10.606s
</pre></div>
</div>
<p>Terminator:</p>
<div class="highlight-python"><div class="highlight"><pre>time for i in {1..30} ; do terminator -g deletemeconfig -p Quickexit; done
GTK2: real 0m11.928s A smidgen slower.
GTK3: real 0m10.885s Yeah, basically identical!
</pre></div>
</div>
<p>Cold start, using <code class="docutils literal"><span class="pre">sync</span> <span class="pre">&amp;&amp;</span> <span class="pre">echo</span> <span class="pre">3</span> <span class="pre">&gt;</span> <span class="pre">/proc/sys/vm/drop_caches</span></code> before
each run, then launching a single timed instance.</p>
<p>Gnome-Terminal:</p>
<div class="highlight-python"><div class="highlight"><pre>time gnome-terminal --profile=Quickexit
real 0m7.628s (approx median, there was a strange variance for GT, between 5 and 9 secs)
</pre></div>
</div>
<p>Terminator:</p>
<div class="highlight-python"><div class="highlight"><pre>time terminator -g deletemeconfig -p Quickexit
GTK2: real 0m11.390s (median of 3x)
GTK3: real 0m11.264s (median of 3x)
</pre></div>
</div>
<p>OK, so this is the once place you would notice an appreciable
difference. How often do you start these things with completely empty
caches/buffers?</p>
<p>In GTK2 there is a known issue which slows the cat&#8217;ing of large files
quite a bit. The VTE in GTK3 Terminator is the <em>exact</em> same widget
GNOME-Terminal uses, so this will get better, as and when we move
fully to the in-progress GTK3 port. I should point out that this
performance deficit is not due to the Python interpreter, or the
Terminator Python code, but is solely down to the compiled C code VTE
widget.</p>
</div>
<div class="section" id="memory-use-the-dumb-way">
<h4>Memory use - The dumb way<a class="headerlink" href="#memory-use-the-dumb-way" title="Permalink to this headline"></a></h4>
<p>GNOME-Terminal:</p>
<div class="highlight-python"><div class="highlight"><pre> for i in {1..100} ; do gnome-terminal --disable-factory &amp; done
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free # Before startup
total used free shared buffers cached
Mem: 3102404 1388776 1713628 4052 164 45340
-/+ buffers/cache: 1343272 1759132
Swap: 3121996 788704 2333292
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free # After startup
total used free shared buffers cached
Mem: 3102404 2439524 662880 57196 1240 99212
-/+ buffers/cache: 2339072 763332
Swap: 3121996 751440 2370556
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free # After kill
total used free shared buffers cached
Mem: 3102404 1466536 1635868 4796 160 45912
-/+ buffers/cache: 1420464 1681940
Swap: 3121996 751020 2370976
Used (used mem -buffers/cache + swap)
Before start: 2131976
After start : 3090512 = 958536 kbytes, 936 Mbytes / 9.36 MBytes/instance
After kill : 2171484 = 39508 kbytes, 38 Mbytes not recovered
</pre></div>
</div>
<p>Terminator GTK2:</p>
<div class="highlight-python"><div class="highlight"><pre>for i in {1..100} ; do terminator -g deletemeconfig -u &amp; done
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free
total used free shared buffers cached
Mem: 3102404 1313456 1788948 4284 152 43844
-/+ buffers/cache: 1269460 1832944
Swap: 3121996 736844 2385152
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free
total used free shared buffers cached
Mem: 3102404 2866552 235852 19484 1084 65408
-/+ buffers/cache: 2800060 302344
Swap: 3121996 736340 2385656
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free
total used free shared buffers cached
Mem: 3102404 1317724 1784680 4284 152 43464
-/+ buffers/cache: 1274108 1828296
Swap: 3121996 736304 2385692
Used (used mem -buffers/cache + swap)
before start: 2006304
after start : 3536400 = 1530096 kbytes, 1494 Mbytes / 14.94 MBytes/instance
after kill : 2010412 = 4108 kbytes, 4 Mbytes not recovered
</pre></div>
</div>
<p>Terminator GTK3:</p>
<div class="highlight-python"><div class="highlight"><pre>for i in {1..100} ; do terminator -g deletemeconfig -u &amp; done
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free
total used free shared buffers cached
Mem: 3102404 1467204 1635200 4816 120 46132
-/+ buffers/cache: 1420952 1681452
Swap: 3121996 751000 2370996
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free
total used free shared buffers cached
Mem: 3102404 2848372 254032 7216 960 52652
-/+ buffers/cache: 2794760 307644
Swap: 3121996 750016 2371980
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free
total used free shared buffers cached
Mem: 3102404 1483388 1619016 4820 148 46084
-/+ buffers/cache: 1437156 1665248
Swap: 3121996 749828 2372168
Used (used mem -buffers/cache + swap)
before start: 2171952
after start : 3544776 = 1372824 kbytes, 1340 Mbytes / 13.41 MBytes/instance
after kill : 2186984 = 15032 kbytes, 15 Mbytes not recovered
</pre></div>
</div>
<p>OK, so yes, there is more overhead. We did just start 100 Python
interpreters! As titled, this is dumb, and even if you use this dumb
method, are you really going to have a hundred of them?...</p>
</div>
<div class="section" id="memory-use-the-sensible-way">
<h4>Memory use - The sensible way<a class="headerlink" href="#memory-use-the-sensible-way" title="Permalink to this headline"></a></h4>
<p>GNOME-Terminal:</p>
<div class="highlight-python"><div class="highlight"><pre>gnome-terminal &amp;
for i in {1..100} ; do gnome-terminal &amp; done
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free # Before 100
total used free shared buffers cached
Mem: 3102404 1490996 1611408 5344 172 47580
-/+ buffers/cache: 1443244 1659160
Swap: 3121996 749776 2372220
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free # After 100
total used free shared buffers cached
Mem: 3102404 1878228 1224176 5344 172 47388
-/+ buffers/cache: 1830668 1271736
Swap: 3121996 733396 2388600
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free # After kill
total used free shared buffers cached
Mem: 3102404 1491888 1610516 4840 272 46088
-/+ buffers/cache: 1445528 1656876
Swap: 3121996 733240 2388756
Used (used mem -buffers/cache + swap)
Before start: 2193020
After start : 2564064 = 371044 kbytes, 362 Mbytes / 3.59 MBytes/instance
After kill : 2178768 = −14252 kbytes, -13.92 Mbytes recovered (first process)
</pre></div>
</div>
<p>Terminator GTK2:</p>
<div class="highlight-python"><div class="highlight"><pre>terminator -g deletemeconfig &amp;
for i in {1..100} ; do terminator -g deletemeconfig -u &amp; done
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free
total used free shared buffers cached
Mem: 3102404 1324492 1777912 4388 152 49688
-/+ buffers/cache: 1274652 1827752
Swap: 3121996 744528 2377468
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free
total used free shared buffers cached
Mem: 3102404 1652112 1450292 4756 860 49968
-/+ buffers/cache: 1601284 1501120
Swap: 3121996 744224 2377772
root@pinpoint:~# sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches &amp;&amp; free
total used free shared buffers cached
Mem: 3102404 1305376 1797028 4236 124 42836
-/+ buffers/cache: 1262416 1839988
Swap: 3121996 744116 2377880
Used (used mem -buffers/cache + swap)
before start: 2019180
after start : 2345508 = 326328 kbytes, 319 Mbytes / 3.16 MBytes/instance
after kill : 2006532 = −12648 kbytes, -12.35 Mbytes recovered (first process)
</pre></div>
</div>
<p>Terminator GTK3:</p>
<div class="highlight-python"><div class="highlight"><pre>Not possible at the moment because the DBus interface still needs fixing.
</pre></div>
</div>
<p>So that one surprised me a bit. The fact that when using the single
process we are <strong>more</strong> memory efficient. Python + 100 terminals is
using &lt;90% of the GNOME-Terminal + 100 terminals.</p>
<p>Some may think that this is something to do with the different version
of the VTE widget, but hang on a second. In the dumb method GTK2
Terminator used <strong>more</strong> memory than GTK3. Once the DBus is fixed for
GTK3 there could potentially be more savings.</p>
</div>
<div class="section" id="python-sucks">
<h4>&#8220;Python sucks!&#8221;<a class="headerlink" href="#python-sucks" title="Permalink to this headline"></a></h4>
<p>Yeah, whatever. The fact is that I&#8217;m a helluva lot more productive in
Python than I ever was, am, or will be, in C. In my totally biased
and uninformed opinion, I also think certain things are <em>much</em> easier
to get working in Python because you can iterate faster. With the
<a class="reference internal" href="advancedusage.html#debugging"><span>Debugging</span></a> option to run an interactive terminal you even
have the ability to try out ideas and explore the running instance
directly. Results don&#8217;t get more immediate than that!</p>
</div>
<div class="section" id="in-summary">
<h4>In summary<a class="headerlink" href="#in-summary" title="Permalink to this headline"></a></h4>
<p>It&#8217;s a bit slower on startup, it takes a bit more memory, but that&#8217;s
when you use the dumb method. In normal use, where you&#8217;re likely to
be using the existing process to open a new window, it is for all
practical purposes as fast as the compiled GNOME-Terminal. It may
even (according to the last memory section) be a little lighter
memory wise, and more obliging about giving it back!</p>
<p>I didn&#8217;t compare to things like xterm, because frankly we&#8217;re not
aimed at the same people. Personally I&#8217;d rather have the more
extensive features saving me <em>lots</em> of time over the course of the
day when using it, than save a handful of seconds every few days
when I restart it, or worrying about an extra 5 or 10 MBytes.</p>
</div>
</div>
</div>
<div class="section" id="how-do-i">
<h2>How do I...<a class="headerlink" href="#how-do-i" title="Permalink to this headline"></a></h2>
<div class="section" id="make-terminator-work-like-quake-style-terminals">
<h3>...make Terminator work like Quake style terminals?<a class="headerlink" href="#make-terminator-work-like-quake-style-terminals" title="Permalink to this headline"></a></h3>
<blockquote>
<div><p>You can get close, but it isn&#8217;t a perfect recreation, as Terminator
was not designed with this in mind, but improvements are always welcome!</p>
<ul class="simple">
<li>Window state: Hidden</li>
<li>Always on top: On</li>
<li>Show on all workspaces: On</li>
<li>Hide on lose focus: On</li>
<li>Hide from taskbar</li>
<li>Window borders: Off (use <code class="docutils literal"><span class="pre">Alt</span></code>+<code class="docutils literal"><span class="pre">click-drag</span></code> and
<code class="docutils literal"><span class="pre">Alt</span></code>+<code class="docutils literal"><span class="pre">middle-click-drag</span></code> to position and size window.)</li>
<li>Set the Toggle window visibility shortcut to your preference</li>
</ul>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">It must be the first Terminator instance started, because
at present only the first instance can bind to the Window
toggle.</p>
</div>
<p>This will give you a terminal hidden at startup that appears with a
keypress and disappears, either with another keypress, or losing focus.
It will stay on top, and appear on whichever workspace you are on.</p>
<p>Something that we don&#8217;t have is the slide in action of a true Quake
style terminal. The terminal will simply flick into view, and flick
out of view.</p>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">The Hide on lose focus option is problematic at this
time. You will probably find it very frustrating.</p>
</div>
</div></blockquote>
</div>
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