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Golang XML worker queue example
Raw
README.md

Parallel XML processing

When working with large XML files, only a streaming approach is feasible, which also helps to work on the data in parallel, since only one record needs to be cosidered at a time.

First version of wikikit parsed the XML element in the main routine and the fan out the parsed struct to the workers. Thanks to pprof, it got clear, why this did not yield major speed improvements - most time was spent in converting a XML token into a struct.

Single routine, tokenization only

Needs about 6.268s to decode and parse 10000 XML elements.

Skipping struct parsing:

decoder := xml.NewDecoder(handle)
var inElement string

for {
	t, _ := decoder.Token()
	if t == nil {
		break
	}
	switch se := t.(type) {
	case xml.StartElement:
		inElement = se.Name.Local
		if inElement == "page" {
			// ...
		}
	default:
	}
}

gets the speed down to 0.433s. Just tokenizing through a 34G XML file with a single routine takes 39m21.517s saturating a single core.

Time distribution looks like this: https://cdn.mediacru.sh/DYyiKLBA7U2i.svg

Single routine, struct loading

decoder := xml.NewDecoder(handle)
var inElement string
var p Page

for {
	// Read tokens from the XML document in a stream.
	t, _ := decoder.Token()
	if t == nil {
		break
	}
	// Inspect the type of the token just read.
	switch se := t.(type) {
	case xml.StartElement:
		// If we just read a StartElement token
		inElement = se.Name.Local
		// ...and its name is "page"
		if inElement == "page" {
			// decode a whole chunk of following XML into the
			// variable p which is a Page (se above)
			decoder.DecodeElement(&p, &se)
		}
	default:
	}
}

Observation

Most time is spent actually getting the token out. DecodeElement is not unsignificant. Grepping for </page> in 34G takes finds 15671705 occurences and takes about 16m35.992s.

Distributing decoder.Token() among workers seems not that easy. Workaround could be to

  • split the file into N pieces, while preserving the XML structure,
  • write the N pieces to N files,
  • convert each file in a separate routine,
  • concatenate the result into a single file.
Raw
inspect.sh
#!/usr/bin/env bash
go tool pprof --web xmlp $1
Raw
Makefile
all:
go fmt xmlp.go
go build xmlp.go
clean:
rm -f xmlp
Display the source blob
Display the rendered blob
Raw
v0.svg
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<!-- Generated by graphviz version 2.26.3 (20100126.1600)
-->
<!-- Title: xmlp; 193930 samples Pages: 1 -->
<svg width="100%" height="100%"
xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<script type="text/ecmascript"><![CDATA[
// SVGPan
// http://www.cyberz.org/blog/2009/12/08/svgpan-a-javascript-svg-panzoomdrag-library/
// Local modification: if(true || ...) below to force panning, never moving.
// Local modification: add clamping to fix bug in handleMouseWheel.
/**
* SVGPan library 1.2
* ====================
*
* Given an unique existing element with id "viewport", including the
* the library into any SVG adds the following capabilities:
*
* - Mouse panning
* - Mouse zooming (using the wheel)
* - Object dargging
*
* Known issues:
*
* - Zooming (while panning) on Safari has still some issues
*
* Releases:
*
* 1.2, Sat Mar 20 08:42:50 GMT 2010, Zeng Xiaohui
* Fixed a bug with browser mouse handler interaction
*
* 1.1, Wed Feb 3 17:39:33 GMT 2010, Zeng Xiaohui
* Updated the zoom code to support the mouse wheel on Safari/Chrome
*
* 1.0, Andrea Leofreddi
* First release
*
* This code is licensed under the following BSD license:
*
* Copyright 2009-2010 Andrea Leofreddi <[email protected]>. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY Andrea Leofreddi ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Andrea Leofreddi OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of Andrea Leofreddi.
*/
var root = document.documentElement;
var state = 'none', stateTarget, stateOrigin, stateTf;
setupHandlers(root);
/**
* Register handlers
*/
function setupHandlers(root){
setAttributes(root, {
"onmouseup" : "add(evt)",
"onmousedown" : "handleMouseDown(evt)",
"onmousemove" : "handleMouseMove(evt)",
"onmouseup" : "handleMouseUp(evt)",
//"onmouseout" : "handleMouseUp(evt)", // Decomment this to stop the pan functionality when dragging out of the SVG element
});
if(navigator.userAgent.toLowerCase().indexOf('webkit') >= 0)
window.addEventListener('mousewheel', handleMouseWheel, false); // Chrome/Safari
else
window.addEventListener('DOMMouseScroll', handleMouseWheel, false); // Others
var g = svgDoc.getElementById("svg");
g.width = "100%";
g.height = "100%";
}
/**
* Instance an SVGPoint object with given event coordinates.
*/
function getEventPoint(evt) {
var p = root.createSVGPoint();
p.x = evt.clientX;
p.y = evt.clientY;
return p;
}
/**
* Sets the current transform matrix of an element.
*/
function setCTM(element, matrix) {
var s = "matrix(" + matrix.a + "," + matrix.b + "," + matrix.c + "," + matrix.d + "," + matrix.e + "," + matrix.f + ")";
element.setAttribute("transform", s);
}
/**
* Dumps a matrix to a string (useful for debug).
*/
function dumpMatrix(matrix) {
var s = "[ " + matrix.a + ", " + matrix.c + ", " + matrix.e + "\n " + matrix.b + ", " + matrix.d + ", " + matrix.f + "\n 0, 0, 1 ]";
return s;
}
/**
* Sets attributes of an element.
*/
function setAttributes(element, attributes){
for (i in attributes)
element.setAttributeNS(null, i, attributes[i]);
}
/**
* Handle mouse move event.
*/
function handleMouseWheel(evt) {
if(evt.preventDefault)
evt.preventDefault();
evt.returnValue = false;
var svgDoc = evt.target.ownerDocument;
var delta;
if(evt.wheelDelta)
delta = evt.wheelDelta / 3600; // Chrome/Safari
else
delta = evt.detail / -90; // Mozilla
var z = 1 + delta; // Zoom factor: 0.9/1.1
// Clamp to reasonable values.
// The 0.1 check is important because
// a very large scroll can turn into a
// negative z, which rotates the image 180 degrees.
if(z < 0.1)
z = 0.1;
if(z > 10.0)
z = 10.0;
var g = svgDoc.getElementById("viewport");
var p = getEventPoint(evt);
p = p.matrixTransform(g.getCTM().inverse());
// Compute new scale matrix in current mouse position
var k = root.createSVGMatrix().translate(p.x, p.y).scale(z).translate(-p.x, -p.y);
setCTM(g, g.getCTM().multiply(k));
stateTf = stateTf.multiply(k.inverse());
}
/**
* Handle mouse move event.
*/
function handleMouseMove(evt) {
if(evt.preventDefault)
evt.preventDefault();
evt.returnValue = false;
var svgDoc = evt.target.ownerDocument;
var g = svgDoc.getElementById("viewport");
if(state == 'pan') {
// Pan mode
var p = getEventPoint(evt).matrixTransform(stateTf);
setCTM(g, stateTf.inverse().translate(p.x - stateOrigin.x, p.y - stateOrigin.y));
} else if(state == 'move') {
// Move mode
var p = getEventPoint(evt).matrixTransform(g.getCTM().inverse());
setCTM(stateTarget, root.createSVGMatrix().translate(p.x - stateOrigin.x, p.y - stateOrigin.y).multiply(g.getCTM().inverse()).multiply(stateTarget.getCTM()));
stateOrigin = p;
}
}
/**
* Handle click event.
*/
function handleMouseDown(evt) {
if(evt.preventDefault)
evt.preventDefault();
evt.returnValue = false;
var svgDoc = evt.target.ownerDocument;
var g = svgDoc.getElementById("viewport");
if(true || evt.target.tagName == "svg") {
// Pan mode
state = 'pan';
stateTf = g.getCTM().inverse();
stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
} else {
// Move mode
state = 'move';
stateTarget = evt.target;
stateTf = g.getCTM().inverse();
stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
}
}
/**
* Handle mouse button release event.
*/
function handleMouseUp(evt) {
if(evt.preventDefault)
evt.preventDefault();
evt.returnValue = false;
var svgDoc = evt.target.ownerDocument;
if(state == 'pan' || state == 'move') {
// Quit pan mode
state = '';
}
}
]]></script>
<g id="viewport" transform="translate(0,0)">
<g id="viewport" class="graph" transform="scale(1 1) rotate(0) translate(4 1730)">
<title>xmlp; 193930 samples</title>
<polygon fill="white" stroke="white" points="-4,5 -4,-1730 2361,-1730 2361,5 -4,5"/>
<!-- Legend -->
<g id="node1" class="node"><title>Legend</title>
<text text-anchor="start" x="626.5" y="-1699.9" font-family="Times Roman,serif" font-size="24.00">xmlp</text>
<text text-anchor="start" x="626.5" y="-1670.9" font-family="Times Roman,serif" font-size="24.00">Total samples: 193930</text>
<text text-anchor="start" x="626.5" y="-1641.9" font-family="Times Roman,serif" font-size="24.00">Focusing on: 193930</text>
<text text-anchor="start" x="626.5" y="-1612.9" font-family="Times Roman,serif" font-size="24.00">Dropped nodes with &lt;= 969 abs(samples)</text>
<text text-anchor="start" x="626.5" y="-1583.9" font-family="Times Roman,serif" font-size="24.00">Dropped edges with &lt;= 193 samples</text>
</g>
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<text text-anchor="end" x="1249.5" y="-1636.21" font-family="Times Roman,serif" font-size="8.10">of 185014 (95.4%)</text>
</g>
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</g>
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<text text-anchor="end" x="1258.5" y="-1382.37" font-family="Times Roman,serif" font-size="10.70">557 (0.3%)</text>
<text text-anchor="end" x="1258.5" y="-1368.37" font-family="Times Roman,serif" font-size="10.70">of 185013 (95.4%)</text>
</g>
<!-- N4 -->
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<text text-anchor="end" x="1308.5" y="-1255.8" font-family="Times Roman,serif" font-size="13.00">of 184056 (94.9%)</text>
</g>
<!-- N2&#45;&gt;N4 -->
<g id="edge122" class="edge"><title>N2&#45;&gt;N4</title>
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</g>
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<g id="edge2" class="edge"><title>N3&#45;&gt;N2</title>
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</g>
<!-- N5 -->
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<text text-anchor="end" x="1328" y="-1139.58" font-family="Times Roman,serif" font-size="13.80">of 176481 (91.0%)</text>
</g>
<!-- N4&#45;&gt;N5 -->
<g id="edge34" class="edge"><title>N4&#45;&gt;N5</title>
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</g>
<!-- N23 -->
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<text text-anchor="end" x="946" y="-1046.15" font-family="Times Roman,serif" font-size="11.50">963 (0.5%)</text>
<text text-anchor="end" x="946" y="-1031.15" font-family="Times Roman,serif" font-size="11.50">of 6839 (3.5%)</text>
</g>
<!-- N4&#45;&gt;N23 -->
<g id="edge96" class="edge"><title>N4&#45;&gt;N23</title>
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</g>
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<g id="node49" class="node"><title>N48</title>
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<text text-anchor="middle" x="1451" y="-1172.46" font-family="Times Roman,serif" font-size="10.60">encoding/xml.(*Decoder).translate</text>
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</g>
<!-- N4&#45;&gt;N48 -->
<g id="edge100" class="edge"><title>N4&#45;&gt;N48</title>
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</g>
<!-- N49 -->
<g id="node50" class="node"><title>N49</title>
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<text text-anchor="middle" x="920" y="-1169.67" font-family="Times Roman,serif" font-size="8.70">runtime.new</text>
<text text-anchor="end" x="952" y="-1158.67" font-family="Times Roman,serif" font-size="8.70">33 (0.0%)</text>
<text text-anchor="end" x="952" y="-1147.67" font-family="Times Roman,serif" font-size="8.70">of 982 (0.5%)</text>
</g>
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<g id="edge124" class="edge"><title>N4&#45;&gt;N49</title>
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<g id="edge50" class="edge"><title>N5&#45;&gt;N6</title>
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<text text-anchor="end" x="1980.5" y="-613.18" font-family="Times Roman,serif" font-size="14.80">of 16743 (8.6%)</text>
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<!-- N5&#45;&gt;N14 -->
<g id="edge32" class="edge"><title>N5&#45;&gt;N14</title>
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<!-- N5&#45;&gt;N23 -->
<g id="edge8" class="edge"><title>N5&#45;&gt;N23</title>
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<text text-anchor="end" x="818.5" y="-1032.37" font-family="Times Roman,serif" font-size="10.70">of 2551 (1.3%)</text>
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<!-- N5&#45;&gt;N37 -->
<g id="edge108" class="edge"><title>N5&#45;&gt;N37</title>
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<!-- N6&#45;&gt;N7 -->
<g id="edge56" class="edge"><title>N6&#45;&gt;N7</title>
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<!-- N6&#45;&gt;N8 -->
<g id="edge90" class="edge"><title>N6&#45;&gt;N8</title>
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<g id="node10" class="node"><title>N9</title>
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<text text-anchor="end" x="1553.5" y="-748.56" font-family="Times Roman,serif" font-size="16.60">of 29177 (15.0%)</text>
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<!-- N6&#45;&gt;N9 -->
<g id="edge4" class="edge"><title>N6&#45;&gt;N9</title>
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<g id="node11" class="node"><title>N10</title>
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<text text-anchor="middle" x="914" y="-789.09" font-family="Times Roman,serif" font-size="14.90">encoding/xml.isName</text>
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<text text-anchor="end" x="996" y="-751.09" font-family="Times Roman,serif" font-size="14.90">of 23924 (12.3%)</text>
</g>
<!-- N6&#45;&gt;N10 -->
<g id="edge136" class="edge"><title>N6&#45;&gt;N10</title>
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<!-- N6&#45;&gt;N14 -->
<g id="edge80" class="edge"><title>N6&#45;&gt;N14</title>
<path fill="none" stroke="black" d="M1414.11,-883.401C1508.43,-864.942 1607.54,-839.621 1644,-810 1673.11,-786.351 1661.73,-764.769 1688,-738 1712.78,-712.748 1744.92,-690.733 1773.89,-673.683"/>
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<!-- N18 -->
<g id="node19" class="node"><title>N18</title>
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<text text-anchor="end" x="1275" y="-631.52" font-family="Times Roman,serif" font-size="17.20">6529 (3.4%)</text>
<text text-anchor="end" x="1275" y="-609.52" font-family="Times Roman,serif" font-size="17.20">of 13338 (6.9%)</text>
</g>
<!-- N6&#45;&gt;N18 -->
<g id="edge14" class="edge"><title>N6&#45;&gt;N18</title>
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<!-- N21 -->
<g id="node22" class="node"><title>N21</title>
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<text text-anchor="end" x="680" y="-757.01" font-family="Times Roman,serif" font-size="11.10">of 9068 (4.7%)</text>
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<g id="edge40" class="edge"><title>N6&#45;&gt;N21</title>
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<text text-anchor="end" x="510.5" y="-757.37" font-family="Times Roman,serif" font-size="10.70">of 6812 (3.5%)</text>
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<!-- N6&#45;&gt;N24 -->
<g id="edge16" class="edge"><title>N6&#45;&gt;N24</title>
<path fill="none" stroke="black" d="M1005.76,-865.616C1002.83,-865.062 999.903,-864.523 997,-864 929.616,-851.858 909.242,-866.771 844,-846 828.081,-840.932 827.05,-832.638 811,-828 689.496,-792.887 649.828,-840.157 527,-810 519.539,-808.168 511.908,-805.682 504.456,-802.866"/>
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<text text-anchor="end" x="798.5" y="-757.37" font-family="Times Roman,serif" font-size="10.70">of 6519 (3.4%)</text>
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<!-- N6&#45;&gt;N26 -->
<g id="edge22" class="edge"><title>N6&#45;&gt;N26</title>
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<g id="node35" class="node"><title>N34</title>
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<text text-anchor="end" x="2136.5" y="-753.26" font-family="Times Roman,serif" font-size="13.60">of 3742 (1.9%)</text>
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<!-- N6&#45;&gt;N34 -->
<g id="edge6" class="edge"><title>N6&#45;&gt;N34</title>
<path fill="none" stroke="black" d="M1414.17,-896.276C1518.94,-884.609 1648.32,-867.81 1763,-846 1820.59,-835.046 1883.9,-819.233 1935.92,-805.214"/>
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<!-- N36 -->
<g id="node37" class="node"><title>N36</title>
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<text text-anchor="end" x="1150.5" y="-755.88" font-family="Times Roman,serif" font-size="11.80">of 2756 (1.4%)</text>
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<!-- N6&#45;&gt;N36 -->
<g id="edge86" class="edge"><title>N6&#45;&gt;N36</title>
<path fill="none" stroke="black" d="M1158.76,-863.926C1153.33,-857.978 1147.98,-851.923 1143,-846 1133.19,-834.336 1123.12,-821.03 1114.41,-809.056"/>
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<g id="node45" class="node"><title>N44</title>
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<text text-anchor="middle" x="1812" y="-778.29" font-family="Times Roman,serif" font-size="11.90">bytes.(*Buffer).Truncate</text>
<text text-anchor="end" x="1882.5" y="-763.29" font-family="Times Roman,serif" font-size="11.90">1209 (0.6%)</text>
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<!-- N6&#45;&gt;N44 -->
<g id="edge44" class="edge"><title>N6&#45;&gt;N44</title>
<path fill="none" stroke="black" d="M1414.16,-894.603C1521.91,-881.687 1642.1,-864.236 1693,-846 1724.04,-834.879 1755.83,-815.136 1778.73,-799.133"/>
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<text text-anchor="middle" x="1530" y="-509.84" font-family="Times Roman,serif" font-size="22.40">bytes.(*Buffer).grow</text>
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<text text-anchor="end" x="1645" y="-453.84" font-family="Times Roman,serif" font-size="22.40">of 16126 (8.3%)</text>
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<!-- N7&#45;&gt;N15 -->
<g id="edge128" class="edge"><title>N7&#45;&gt;N15</title>
<path fill="none" stroke="black" d="M1530,-588.357C1530,-574.35 1530,-558.893 1530,-544.393"/>
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<text text-anchor="middle" x="2172" y="-363.79" font-family="Times Roman,serif" font-size="21.90">bufio.(*Reader).ReadByte</text>
<text text-anchor="end" x="2310.5" y="-336.79" font-family="Times Roman,serif" font-size="21.90">14901 (7.7%)</text>
<text text-anchor="end" x="2310.5" y="-309.79" font-family="Times Roman,serif" font-size="21.90">of 14997 (7.7%)</text>
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<!-- N8&#45;&gt;N16 -->
<g id="edge116" class="edge"><title>N8&#45;&gt;N16</title>
<path fill="none" stroke="black" d="M2172,-441.722C2172,-427.85 2172,-412.498 2172,-398.115"/>
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<!-- N9&#45;&gt;N7 -->
<g id="edge114" class="edge"><title>N9&#45;&gt;N7</title>
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<!-- N9&#45;&gt;N14 -->
<g id="edge72" class="edge"><title>N9&#45;&gt;N14</title>
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<text text-anchor="end" x="975.5" y="-612.91" font-family="Times Roman,serif" font-size="15.10">of 14960 (7.7%)</text>
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<g id="edge126" class="edge"><title>N10&#45;&gt;N17</title>
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<!-- N10&#45;&gt;N18 -->
<g id="edge18" class="edge"><title>N10&#45;&gt;N18</title>
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<text text-anchor="end" x="426" y="-481.69" font-family="Times Roman,serif" font-size="20.90">12957 (6.7%)</text>
<text text-anchor="end" x="426" y="-456.69" font-family="Times Roman,serif" font-size="20.90">of 22876 (11.8%)</text>
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<g id="node30" class="node"><title>N29</title>
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<text text-anchor="end" x="380" y="-329.76" font-family="Times Roman,serif" font-size="8.60">of 4678 (2.4%)</text>
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<!-- N11&#45;&gt;N29 -->
<g id="edge84" class="edge"><title>N11&#45;&gt;N29</title>
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<!-- N31 -->
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<text text-anchor="end" x="252" y="-328.96" font-family="Times Roman,serif" font-size="15.60">4446 (2.3%)</text>
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<!-- N11&#45;&gt;N31 -->
<g id="edge104" class="edge"><title>N11&#45;&gt;N31</title>
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<!-- N13 -->
<g id="node14" class="node"><title>N13</title>
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<text text-anchor="end" x="980" y="-899.01" font-family="Times Roman,serif" font-size="11.10">of 18649 (9.6%)</text>
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<!-- N12&#45;&gt;N13 -->
<g id="edge38" class="edge"><title>N12&#45;&gt;N13</title>
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<!-- N42 -->
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<text text-anchor="end" x="772.5" y="-900.5" font-family="Times Roman,serif" font-size="10.00">of 1217 (0.6%)</text>
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<!-- N12&#45;&gt;N42 -->
<g id="edge118" class="edge"><title>N12&#45;&gt;N42</title>
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<!-- N13&#45;&gt;N9 -->
<g id="edge58" class="edge"><title>N13&#45;&gt;N9</title>
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<!-- N13&#45;&gt;N10 -->
<g id="edge36" class="edge"><title>N13&#45;&gt;N10</title>
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<!-- N13&#45;&gt;N21 -->
<g id="edge132" class="edge"><title>N13&#45;&gt;N21</title>
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<!-- N13&#45;&gt;N24 -->
<g id="edge106" class="edge"><title>N13&#45;&gt;N24</title>
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<!-- N14&#45;&gt;N8 -->
<g id="edge60" class="edge"><title>N14&#45;&gt;N8</title>
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<text text-anchor="middle" x="2052" y="-557.4" font-family="Times Roman,serif" font-size="14.00">13195</text>
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<!-- N20 -->
<g id="node21" class="node"><title>N20</title>
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<text text-anchor="middle" x="914" y="-495.09" font-family="Times Roman,serif" font-size="19.90">unicode.is16</text>
<text text-anchor="end" x="983.5" y="-470.09" font-family="Times Roman,serif" font-size="19.90">11038 (5.7%)</text>
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<!-- N17&#45;&gt;N20 -->
<g id="edge24" class="edge"><title>N17&#45;&gt;N20</title>
<path fill="none" stroke="black" d="M914,-603.154C914,-580.751 914,-550.969 914,-527.305"/>
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<text text-anchor="middle" x="937" y="-557.4" font-family="Times Roman,serif" font-size="14.00">11038</text>
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<!-- N25 -->
<g id="node26" class="node"><title>N25</title>
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<text text-anchor="middle" x="1162" y="-494.34" font-family="Times Roman,serif" font-size="17.40">unicode/utf8.decodeRuneInternal</text>
<text text-anchor="end" x="1307" y="-472.34" font-family="Times Roman,serif" font-size="17.40">6809 (3.5%)</text>
</g>
<!-- N18&#45;&gt;N25 -->
<g id="edge76" class="edge"><title>N18&#45;&gt;N25</title>
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<!-- N19 -->
<g id="node20" class="node"><title>N19</title>
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<text text-anchor="end" x="664" y="-615.8" font-family="Times Roman,serif" font-size="13.00">of 12706 (6.6%)</text>
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<!-- N19&#45;&gt;N11 -->
<g id="edge64" class="edge"><title>N19&#45;&gt;N11</title>
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</g>
<!-- N21&#45;&gt;N19 -->
<g id="edge120" class="edge"><title>N21&#45;&gt;N19</title>
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<!-- N35 -->
<g id="node36" class="node"><title>N35</title>
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</g>
<!-- N21&#45;&gt;N35 -->
<g id="edge42" class="edge"><title>N21&#45;&gt;N35</title>
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<!-- N22 -->
<g id="node23" class="node"><title>N22</title>
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<text text-anchor="middle" x="1334" y="-1656.8" font-family="Times Roman,serif" font-size="8.00">System</text>
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<text text-anchor="end" x="1365.5" y="-1636.8" font-family="Times Roman,serif" font-size="8.00">of 8916 (4.6%)</text>
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<!-- N28 -->
<g id="node29" class="node"><title>N28</title>
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<text text-anchor="middle" x="1334" y="-1497.06" font-family="Times Roman,serif" font-size="16.60">sweepspan</text>
<text text-anchor="end" x="1385.5" y="-1476.06" font-family="Times Roman,serif" font-size="16.60">5770 (3.0%)</text>
</g>
<!-- N22&#45;&gt;N28 -->
<g id="edge10" class="edge"><title>N22&#45;&gt;N28</title>
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<!-- N47 -->
<g id="node48" class="node"><title>N47</title>
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<text text-anchor="middle" x="1463" y="-1502.88" font-family="Times Roman,serif" font-size="11.80">syscall.Syscall</text>
<text text-anchor="end" x="1507.5" y="-1487.88" font-family="Times Roman,serif" font-size="11.80">1137 (0.6%)</text>
<text text-anchor="end" x="1507.5" y="-1472.88" font-family="Times Roman,serif" font-size="11.80">of 1173 (0.6%)</text>
</g>
<!-- N22&#45;&gt;N47 -->
<g id="edge30" class="edge"><title>N22&#45;&gt;N47</title>
<path fill="none" stroke="black" d="M1349.56,-1629.94C1370.63,-1604.14 1408.59,-1557.64 1434.76,-1525.59"/>
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<text text-anchor="middle" x="1442.5" y="-1541.4" font-family="Times Roman,serif" font-size="14.00">1137</text>
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<!-- N27 -->
<g id="node28" class="node"><title>N27</title>
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<text text-anchor="middle" x="301" y="-926.14" font-family="Times Roman,serif" font-size="10.40">copyin</text>
<text text-anchor="end" x="339.5" y="-913.14" font-family="Times Roman,serif" font-size="10.40">447 (0.2%)</text>
<text text-anchor="end" x="339.5" y="-900.14" font-family="Times Roman,serif" font-size="10.40">of 5876 (3.0%)</text>
</g>
<!-- N23&#45;&gt;N27 -->
<g id="edge12" class="edge"><title>N23&#45;&gt;N27</title>
<path fill="none" stroke="black" d="M843.752,-1024.88C840.812,-1023.85 837.882,-1022.88 835,-1022 664.597,-969.738 455.482,-936.954 357.152,-923.31"/>
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<text text-anchor="middle" x="782.5" y="-991.4" font-family="Times Roman,serif" font-size="14.00">5876</text>
</g>
<!-- N24&#45;&gt;N11 -->
<g id="edge26" class="edge"><title>N24&#45;&gt;N11</title>
<path fill="none" stroke="black" d="M397.405,-748.989C374.449,-733.867 350.279,-712.054 342,-684 328.03,-636.664 326.99,-580.127 328.719,-539.966"/>
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</g>
<!-- N24&#45;&gt;N35 -->
<g id="edge28" class="edge"><title>N24&#45;&gt;N35</title>
<path fill="none" stroke="black" d="M446.717,-748.953C447.283,-735.085 448.277,-717.554 450,-702 451.218,-691.003 453.053,-679.052 454.876,-668.38"/>
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</g>
<!-- N26&#45;&gt;N19 -->
<g id="edge74" class="edge"><title>N26&#45;&gt;N19</title>
<path fill="none" stroke="black" d="M729.588,-748.689C707.44,-727.463 675.514,-696.868 650.516,-672.912"/>
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<!-- N33 -->
<g id="node34" class="node"><title>N33</title>
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<text text-anchor="middle" x="185" y="-783.54" font-family="Times Roman,serif" font-size="9.40">runtime.mal</text>
<text text-anchor="end" x="220.5" y="-771.54" font-family="Times Roman,serif" font-size="9.40">145 (0.1%)</text>
<text text-anchor="end" x="220.5" y="-759.54" font-family="Times Roman,serif" font-size="9.40">of 4170 (2.2%)</text>
</g>
<!-- N27&#45;&gt;N33 -->
<g id="edge48" class="edge"><title>N27&#45;&gt;N33</title>
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<g id="node46" class="node"><title>N45</title>
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<text text-anchor="middle" x="301" y="-785.37" font-family="Times Roman,serif" font-size="10.70">runtime.memcopy</text>
<text text-anchor="end" x="348" y="-771.37" font-family="Times Roman,serif" font-size="10.70">576 (0.3%)</text>
<text text-anchor="end" x="348" y="-757.37" font-family="Times Roman,serif" font-size="10.70">of 1180 (0.6%)</text>
</g>
<!-- N27&#45;&gt;N45 -->
<g id="edge70" class="edge"><title>N27&#45;&gt;N45</title>
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<text text-anchor="end" x="394.5" y="-207.81" font-family="Times Roman,serif" font-size="9.10">of 4652 (2.4%)</text>
</g>
<!-- N29&#45;&gt;N30 -->
<g id="edge110" class="edge"><title>N29&#45;&gt;N30</title>
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<!-- N32 -->
<g id="node33" class="node"><title>N32</title>
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<text text-anchor="middle" x="333" y="-132.19" font-family="Times Roman,serif" font-size="10.90">MCentral_Grow</text>
<text text-anchor="end" x="376.5" y="-118.19" font-family="Times Roman,serif" font-size="10.90">662 (0.3%)</text>
<text text-anchor="end" x="376.5" y="-104.19" font-family="Times Roman,serif" font-size="10.90">of 4360 (2.2%)</text>
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<!-- N30&#45;&gt;N32 -->
<g id="edge92" class="edge"><title>N30&#45;&gt;N32</title>
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</g>
<!-- N32&#45;&gt;N38 -->
<g id="edge130" class="edge"><title>N32&#45;&gt;N38</title>
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<text text-anchor="end" x="525" y="-18.67" font-family="Times Roman,serif" font-size="8.70">38 (0.0%)</text>
<text text-anchor="end" x="525" y="-7.67" font-family="Times Roman,serif" font-size="8.70">of 1213 (0.6%)</text>
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<text text-anchor="end" x="2136" y="-625.29" font-family="Times Roman,serif" font-size="11.90">1173 (0.6%)</text>
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<text text-anchor="end" x="229" y="-901.99" font-family="Times Roman,serif" font-size="8.90">of 1996 (1.0%)</text>
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<!-- N37&#45;&gt;N39 -->
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<text text-anchor="end" x="116.5" y="-771.76" font-family="Times Roman,serif" font-size="8.60">24 (0.0%)</text>
<text text-anchor="end" x="116.5" y="-760.76" font-family="Times Roman,serif" font-size="8.60">of 1937 (1.0%)</text>
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xmlp.go
// example of parallel XML stream processing, using wikidata XML dump
package main
import (
"encoding/xml"
"flag"
"fmt"
"os"
"runtime/pprof"
)
type Redirect struct {
Title string `xml:"title,attr" json:"title"`
}
// A page as it occurs on Wikipedia
type Page struct {
Title string `xml:"title" json:"title"`
CanonicalTitle string `xml:"ctitle" json:"ctitle"`
Redir Redirect `xml:"redirect" json:"redirect"`
Text string `xml:"revision>text" json:"text"`
}
func main() {
cpuprofile := flag.String("cpuprofile", "", "write cpu profile to file")
flag.Parse()
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s WIKDATA-XML-FILE\n", os.Args[0])
fmt.Fprintf(os.Stderr, "Find dumps under http://dumps.wikimedia.org/wikidatawiki/\n")
flag.PrintDefaults()
}
if flag.NArg() < 1 {
flag.Usage()
os.Exit(1)
}
filename := flag.Args()[0]
handle, err := os.Open(filename)
if err != nil {
fmt.Println(err)
return
}
defer handle.Close()
decoder := xml.NewDecoder(handle)
var inElement string
var p Page
for {
// Read tokens from the XML document in a stream.
t, _ := decoder.Token()
if t == nil {
break
}
// Inspect the type of the token just read.
switch se := t.(type) {
case xml.StartElement:
// If we just read a StartElement token
inElement = se.Name.Local
// ...and its name is "page"
if inElement == "page" {
// decode a whole chunk of following XML into the
// variable p which is a Page (se above)
decoder.DecodeElement(&p, &se)
}
default:
}
}
}
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