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    <title>JetStream @VERSION@ &mdash; In Depth Analysis</title>

    <link rel="stylesheet" href="JetStream.css">
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<main>
    <a href="index.html"><img id="logo" src="JetStream-Logo.png" alt="JetStream"></a>

    <h1>In Depth Analysis</h1>

    <p>
    JetStream combines a variety of JavaScript benchmarks, covering a variety of
    advanced workloads and programming techniques, and reports a single score that
    balances them using geometric mean.
    </p>

    <p>
    Each benchmark measures a distinct workload, and no single optimization
    technique is sufficient to speed up all benchmarks. Latency tests measure that a
    web application can start up quickly, ramp up to peak performance quickly, and
    run smoothly without interruptions. Throughput tests measure the sustained peak
    performance of a web application, ignoring ramp-up time and spikes in
    smoothness. Some benchmarks demonstrate tradeoffs, and aggressive or specialized
    optimization for one benchmark might make another benchmark slower.
    </p>

    <p>
    JetStream includes benchmarks from the SunSpider 1.0.2 and Octane 2 JavaScript
    benchmark suites. It also includes benchmarks from the LLVM compiler open source
    project, compiled to JavaScript using Emscripten 1.13. It also includes a
    benchmark based on the Apache Harmony open source project's HashMap and a port of
    the <a href="https://www.cs.purdue.edu/sss/projects/cdx/">CDx</a> benchmark,
    hand-translated to JavaScript.
    </p>
    
    <p>
    These benchmarks cover both classical performance measurements &mdash; like Martin
    Richards's machine and language independent benchmark (richards) and the
    Dhrystone synthetic computing benchmark (dry.c) &mdash; and real-world examples &mdash; like
    the Mozilla open source project's PDF renderer (pdfjs), the Box2D JavaScript
    physics engine (box2d), and the jQuery and Closure JavaScript libraries (code-
    first-load, code-multi-load).
    </p>
    
    <p>
    Note that scores from JetStream @VERSION@ are not comparable to scores from other versions
    of JetStream.
    </p>
    
    <dl>
    
    <a name="3d-cube">
    <dt>3d-cube</dt>
    <dd>3D cube rotation benchmark by Simon Speich. This benchmark was
    previously published as part of SunSpider. The original can be found
    on <a href="http://www.speich.net/computer/moztesting/3d.htm">Simon's
    web page</a>. Tests arrays and floating-point math in relatively
    short-running code.  Source
    code: <a href="sources/3d-cube.js">3d-cube.js</a></dd>
    
    <a name="3d-raytrace">
    <dt>3d-raytrace</dt>
    <dd>Simple raytracer written by Oliver Hunt of the WebKit team. This benchmark was
      originally published in SunSpider.  Tests arrays and floating-point
      math in relatively short-running code.  Source
      code: <a href="sources/3d-raytrace.js">3d-raytrace.js</a></dd>
    
    <a name="base64">
    <dt>base64</dt>
    <dd>Base64 encoder/decoder written in JavaScript, originally from the Mozilla XML-RPC client component. Tests string manipulation. This benchmark was previously published as part of SunSpider.
      Source code: <a href="sources/base64.js">base64.js</a></dd>
    
    <a name="cdjs">
    <dt>cdjs</dt>
    <dd>JavaScript implementation of the
      <a href="https://www.cs.purdue.edu/sss/projects/cdx/">CDx collision detection
        benchmark</a>. Measures the browser's worst-case performance over 200 collision
      detection runs.
      Source code: <a href="sources/cdjs-benchmark.js">benchmark.js</a>,
      <a href="sources/cdjs-call_sign.js">call_sign.js</a>,
      <a href="sources/cdjs-collision.js">collision.js</a>,
      <a href="sources/cdjs-collision_detector.js">collision_detector.js</a>,
      <a href="sources/cdjs-constants.js">constants.js</a>,
      <a href="sources/cdjs-motion.js">motion.js</a>,
      <a href="sources/cdjs-red_black_tree.js">red_black_tree.js</a>,
      <a href="sources/cdjs-reduce_collision_set.js">reduce_collision_set.js</a>,
      <a href="sources/cdjs-simulator.js">simulator.js</a>,
      <a href="sources/cdjs-util.js">util.js</a>,
      <a href="sources/cdjs-vector_2d.js">vector_2d.js</a>,
      <a href="sources/cdjs-vector_3d.js">vector_3d.js</a></dd>
    
    <a name="code-first-load">
    <dt>code-first-load</dt>
    <dd>Test of code load speed of the jQuery and Closure libraries. This test attempts to defeat
      the browser's caching capabilities by randomizing the source code, making it representative
      of the first-load experience. This test was previously published in Octane version 2.
      Source code: <a href="sources/code-first-load-code-load.js">code-load.js</a></dd>
    
    <a name="code-multi-load">
    <dt>code-multi-load</dt>
    <dd>Test of code load speed of the jQuery and Closure libraries. Because this test allows
      caching, this is representative of revisiting the same website.
      This test was previously published in Octane version 1.
      Source code: <a href="sources/code-multi-load-code-load.js">code-load.js</a></dd>
    
    <a name="crypto-aes">
    <dt>crypto-aes</dt>
    <dd><a href="http://en.wikipedia.org/wiki/Advanced_Encryption_Standard">Advanced Encryption
        Standard (AES)</a> implementation in JavaScript by Chris Veness. A newer version can be found <a href="http://www.movable-type.co.uk/scripts/aes.html">here</a>. Tests integer math.
      This benchmark was previously published as part of SunSpider.
      Source code: <a href="sources/crypto-aes.js">crypto-aes.js</a></dd>
    
    <a name="crypto-md5">
    <dt>crypto-md5</dt>
    <dd><a href="http://en.wikipedia.org/wiki/Md5">MD5</a> implementation in JavaScript by
      Paul Johnston and others. Tests interesting integer math idioms.
      This benchmark was previously published as part of SunSpider.
      Source code: <a href="sources/crypto-md5.js">crypto-md5.js</a></dd>
    
    <a name="crypto-sha1">
    <dt>crypto-sha1</dt>
    <dd><a href="http://en.wikipedia.org/wiki/Sha1">SHA-1</a> implementation in JavaScript by
      Paul Johnston and others. Tests interesting integer math idioms.
      This benchmark was previously published as part of SunSpider.
      Source code: <a href="sources/crypto-sha1.js">crypto-sha1.js</a></dd>
    
    <a name="date-format-tofte">
    <dt>date-format-tofte</dt>
    <dd>Date and time formatting test, based on code by Svend Tofte. Involves an interesting use of <code>eval</code> and also
      covers string manipulation and JavaScript library functions.
      This benchmark was previously published as part of SunSpider.
      Source code: <a href="sources/date-format-tofte.js">date-format-tofte.js</a></dd>
    
    <a name="date-format-xparb">
    <dt>date-format-xparb</dt>
    <dd>Sophisticated date formatting and parsing library test, based on code by Barin Schwartz.
      This benchmark was previously published as part of SunSpider.
      Source code: <a href="sources/date-format-xparb.js">date-format-xparb.js</a></dd>
    
    <a name="mandreel-latency">
    <dt>mandreel-latency</dt>
    <dd>Tests the <a href="http://bulletphysics.org/">Bullet</a> physics engine's worst case
      performance over many iterations. The physics engine is compiled to JavaScript with
      <a href="http://www.mandreel.com">Mandreel</a>. JetStream also reports the throughput score
      for this test as <a href="#mandreel">mandreel</a>.
      This benchmark was previously published in Octane version 2, but JetStream uses a
      <a href="http://trac.webkit.org/changeset/185425">different latency metric</a>
      based on the average of the <a href="http://trac.webkit.org/changeset/186041">worst 0.5%</a>
      samples.
      Source code: <a href="sources/mandreel.js">mandreel.js</a></dd>
    
    <a name="n-body">
    <dt>n-body</dt>
    <dd>Classic solar system simulation benchmark from
      <a href="http://shootout.alioth.debian.org/">The Great Computer Language Shootout</a>,
      contributed by Isaac Guy. Tests math and object access performance. 
      This benchmark was previously published in SunSpider.
      Source code: <a href="sources/n-body.js">n-body.js</a></dd>
    
    <a name="regex-dna">
    <dt>regex-dna</dt>
    <dd>Regular-expression-based solution to DNA manipulation from
      <a href="http://shootout.alioth.debian.org/">The Great Computer Language Shootout</a>,
      contributed by Jesse Millikan.
      This benchmark was previously published in SunSpider.
      Source code: <a href="sources/regex-dna.js">regex-dna.js</a></dd>
    
    <a name="splay-latency">
    <dt>splay-latency</dt>
    <dd>Tests the worst-case performane of manipulating a
      <a href="http://en.wikipedia.org/wiki/Splay_tree">splay tree</a> represented using plain
      JavaScript objects. JetStream also reports the throughput score for this test
      as <a href="#splay">splay</a>. This benchmark was previously published in Octane version 2, but JetStream uses a
      <a href="http://trac.webkit.org/changeset/185425">different latency metric</a>
      based on the average of the <a href="http://trac.webkit.org/changeset/186041">worst 0.5%</a>
      samples.
      Source code: <a href="sources/splay.js">splay.js</a></dd>
    
    <a name="tagcloud">
    <dt>tagcloud</dt>
    <dd>Parses JSON and generates markup for a <a href="http://en.wikipedia.org/wiki/Tag_cloud">tag
        cloud</a> view of the data. Written by Maciej Stachowiak of the WebKit team. Exercises string parsing and manipulation.
      This benchmark was originally published in SunSpider.
      Source code: <a href="sources/tagcloud.js">tagcloud.js</a></dd>
    
    <a name="typescript">
    <dt>typescript</dt>
    <dd>Tests how quickly Microsoft's <a href="http://www.typescriptlang.org">TypeScript</a> compiler can
      compile itself. This benchmark sets itself apart from the others due to its sheer size. More
      than anything else this tests how quickly a JavaScript runtime can optimize a large pile of
      code.
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/typescript.js">typescript.js</a>, <a href="sources/typescript-compiler.js">typescript-compiler.js</a>, <a href="sources/typescript-input.js">typescript-input.js</a></dd>
    
    <a name="bigfib.cpp">
    <dt>bigfib.cpp</dt>
    <dd>C++ program for computing very large Fibonacci numbers using a BigInt class, compiled to JavaScript with
      Emscripten. Tests asm.js performance, with a focus on complex C++ data structures. 
      The original C++ version of this benchmark was previously published in the LLVM test suite.
      Source code: <a href="sources/bigfib.cpp">bigfib.cpp</a>, <a href="sources/bigfib.cpp.js">bigfib.cpp.js</a></dd>
    
    <a name="box2d">
    <dt>box2d</dt>
    <dd>The Box2D physics engine <a href="https://code.google.com/p/box2dweb/">ported to JavaScript</a>. Tests floating point math and data structures. 
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/box2d.js">box2d.js</a></dd>
    
    <a name="container.cpp">
    <dt>container.cpp</dt>
    <dd>Stepanov and Stroustrup's Standard
        Container Benchmark compiled to JavaScript with
      Emscripten. Tests asm.js performance, with a focus on complex C++ data structures. 
      The original C++ version of this benchmark was previously published in the LLVM test suite.
      Source code: <a href="sources/container.cpp">container.cpp</a>, <a href="sources/container.cpp.js">container.cpp.js</a></dd>
    
    <a name="crypto">
    <dt>crypto</dt>
    <dd>RSA cypher implemented in JavaScript by Tom Wu. Tests integer math and arrays.
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/crypto.js">crypto.js</a></dd>
    
    <a name="delta-blue">
    <dt>delta-blue</dt>
    <dd>The classic DeltaBlue benchmark derived from a Smalltalk implementation by Maloney and
      Wolczko. Tests devirtualization of JavaScript code that uses an idiomatic class hierarchy
      construction.
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/deltablue.js">deltablue.js</a></dd>
    
    <a name="dry.c">
    <dt>dry.c</dt>
    <dd>The classic Dhrystone benchmark program by Reinhold P. Weicker, translated from Ada to C
      by Rick Richardson, and then compiled to JavaScript with Emscripten. Measures basic
      integer arithmetic in asm.js code. 
      The original C version of this benchmark was previously published in the LLVM test suite.
      Source code: <a href="sources/dry.c">dry.c</a>, <a href="sources/dry.c.js">dry.c.js</a></dd>
    
    <a name="earley-boyer">
    <dt>earley-boyer</dt>
    <dd>Tests two classic Scheme benchmarks translated to JavaScript using scheme2js. The first
      benchmark is Earley, is a chart parser algorithm due to Jay Earley. The second is
      Boyer, a logic programming benchmark by Bob Boyer. Measures variadic functions and object
      construction.
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/earley-boyer.js">earley-boyer.js</a></dd>
    
    <a name="float-mm.c">
    <dt>float-mm.c</dt>
    <dd>Floating point matrix multiply benchmark, compiled to JavaScript with Emscripten.
      The original C version of this benchmark was previously published in the LLVM test suite.
      Source code: <a href="sources/float-mm.c">float-mm.c</a>, <a href="sources/float-mm.c.js">float-mm.c.js</a></dd>
    
    <a name="gbemu">
    <dt>gbemu</dt>
    <dd>Gameboy emulator written in JavaScript. Tests typed array and
      property access performance. This benchmark was previously published in Octane version 2.
    
      Source code: <a href="sources/gbemu-part1.js">gbemu-part1.js</a>, <a href="sources/gbemu-part2.js">gbemu-part2.js</a></dd>
    
    <a name="gcc-loops.cpp">
    <dt>gcc-loops.cpp</dt>
    <dd>Example loops used to tune the GCC and LLVM vectorizers, compiled to JavaScript with
      Emscripten. The original C++ version of this benchmark was previously published in the LLVM test suite.
      Source code: <a href="sources/gcc-loops.cpp">gcc-loops.cpp</a></dd>
    
    <a name="hash-map">
    <dt>hash-map</dt>
    <dd>Apache Harmony java.util.HashMap implementation ported to JavaScript and benchmarked by
      doing 500,000 inserts, 2,500,000 queries, and then iterating the associated entrySet. Tests
      object-oriented JavaScript idioms and object construction. The JavaScript version of this benchmark
      was originally published as part of the WebKit test suite.
      Source code: <a href="sources/hash-map.js">hash-map.js</a></dd>
    
    <a name="mandreel">
    <dt>mandreel</dt>
    <dd>Tests the <a href="http://bulletphysics.org/">Bullet</a> physics engine's throughput.
      The physics engine is compiled to JavaScript with
      <a href="http://www.mandreel.com">Mandreel</a>. JetStream also reports the worst-case
      performance score
      for this test as <a href="#mandreel-latency">mandreel-latency</a>.
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/mandreel.js">mandreel.js</a></dd>
    
    <a name="n-body.c">
    <dt>n-body.c</dt>
    <dd>Christoph Bauer's version of the classic solar system simulation benchmark from
      <a href="http://shootout.alioth.debian.org/">The Great Computer Language Shootout</a>, written
      in C and compiled to JavaScript with Emscripten. The original C version of this benchmark was previously published in the LLVM test suite.
      Source code: <a href="sources/n-body.c">n-body.c</a>, <a href="sources/n-body.c.js">n-body.c.js</a></dd>
    
    <a name="navier-stokes">
    <dt>navier-stokes</dt>
    <dd>Fluid simulation written by Oliver Hunt of the WebKit team. Emphasizes floating point array performance.
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/navier-stokes.js">navier-stokes.js</a></dd>
    
    <a name="pdfjs">
    <dt>pdfjs</dt>
    <dd>Mozilla's <a href="http://mozilla.github.io/pdf.js/">PDF reader written in JavaScript</a>.
      This benchmark emphasizes array manipulation and bit operations.
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/pdfjs.js">pdfjs.js</a></dd>
    
    <a name="proto-raytracer">
    <dt>proto-raytracer</dt>
    <dd>Ray tracer written in JavaScript using prototype.js. Tests object construction performance
      and floating point math.
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/raytrace.js">raytrace.js</a></dd>
    
    <a name="quicksort.c">
    <dt>quicksort.c</dt>
    <dd>Quicksort benchmark, compiled to JavaScript with Emscripten.
      The original C version of this benchmark was previously published in the LLVM test suite.
      Source code: <a href="sources/quicksort.c">quicksort.c</a>, <a href="sources/quicksort.c.js">quicksort.c.js</a></dd>
    
    <a name="regexp-2010">
    <dt>regexp-2010</dt>
    <dd>Collection of regular expressions found by the V8 team in 2010, curated into a benchmark.
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/regexp.js">regexp.js</a></dd>
    
    <a name="richards">
    <dt>richards</dt>
    <dd>Martin Richard's <a href="http://www.cl.cam.ac.uk/~mr10/Bench.html">system language
        benchmark</a> ported to JavaScript. Tests object property access performance.
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/richards.js">richards.js</a></dd>
    
    <a name="splay">
    <dt>splay</dt>
    <dd>Tests the throughput of manipulating a
      <a href="http://en.wikipedia.org/wiki/Splay_tree">splay tree</a> represented using plain
      JavaScript objects. JetStream also reports the worst-case performance score for this test
      as <a href="#splay-latency">splay-latency</a>.
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/splay.js">splay.js</a></dd>
    
    <a name="towers.c">
    <dt>towers.c</dt>
    <dd>Towers of Hanoi benchmark from the LLVM test suite, compiled to JavaScript with Emscripten.
      The original C version of this benchmark was previously published in the LLVM test suite.
      Source code: <a href="sources/towers.c">towers.c</a>, <a href="sources/towers.c.js">towers.c.js</a></dd>
    
    <a name="zlib">
    <dt>zlib</dt>
    <dd>A benchmark based on compiling <a href="http://zlib.net">zlib</a> to JavaScript using
      Emscripten. Based on the
      <a href="https://github.com/kripken/emscripten/tree/master/tests/zlib">zlib emscripten
        test</a> but modified to restrict code caching opportunities. 
      This benchmark was previously published in Octane version 2.
      Source code: <a href="sources/zlib.js">zlib.js</a>, <a href="sources/zlib-data.js">zlib-data.js</a></dd>
    </dl>
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