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benchmark: Make flamegraphs a bit more useful

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This commit is contained in:
isaacs 2012-12-27 15:02:57 -08:00
parent ecdde7df15
commit 7550e31d1a
1 changed files with 52 additions and 35 deletions
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87
benchmark/http-flamegraph.sh
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@ -58,42 +58,59 @@ done
kill $nodepid
echo 'Pluck off all the stacks that only happen once.'
node -e '
var fs = require("fs");
var data = fs.readFileSync("'"$name"'.src", "utf8").split(/\n/);
var out = fs.createWriteStream("'"$name"'.out");
function write(l) {
out.write(l + "\n");
}
write(data[0]);
write(data[1]);
write(data[2]);
var stack = [];
var i = 4;
var saw2 = false
for (; i < data.length && !saw2; i++) {
if (data[i] === " 2") {
stack.forEach(function(line) {
write(line);
});
write(data[i]);
saw2 = true;
} else if (data[i] === " 1") {
stack = [];
} else {
stack.push(data[i]);
}
}
for (; i < data.length; i++)
write(data[i]);
'
echo 'Turn the stacks into a svg'
stackvis dtrace flamegraph-svg < "$name".out > "$name".svg
stackvis dtrace flamegraph-svg < "$name".src > "$name".raw.svg
echo 'Prune tiny stacks out of the graph'
node -e '
var infile = process.argv[1];
var outfile = process.argv[2];
var output = "";
var fs = require("fs");
var input = fs.readFileSync(infile, "utf8");
input = input.split("id=\"details\" > </text>");
var head = input.shift() + "id=\"details\" > </text>";
input = input.join("id=\"details\" > </text>");
var tail = "</svg>";
input = input.split("</svg>")[0];
var minyKept = Infinity;
var minyOverall = Infinity;
var rects = input.trim().split(/\n/).filter(function(rect) {
var my = rect.match(/y="([0-9\.]+)"/);
if (!my)
return false;
var y = +my[1];
if (!y)
return false;
minyOverall = Math.min(minyOverall, y);
// pluck off everything that will be less than one pixel.
var mw = rect.match(/width="([0-9\.]+)"/)
if (mw) {
var width = +mw[1];
if (!(width >= 1))
return false;
}
minyKept = Math.min(minyKept, y);
return true;
});
// move everything up to the top of the page.
var ydiff = minyKept - minyOverall;
rects = rects.map(function(rect) {
var my = rect.match(/y="([0-9\.]+)"/);
var y = +my[1];
var newy = y - ydiff;
rect = rect.replace(/y="([0-9\.]+)"/, "y=\"" + newy + "\"");
return rect;
});
fs.writeFileSync(outfile, head + "\n" + rects.join("\n") + "\n" + tail);
' "$name".raw.svg "$name".svg
echo ''
echo 'done. Results in '"$name"'.svg'