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3<title>V8 Benchmark Suite Revisions</title>
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8  <div class="title"><h1>V8 Benchmark Suite Revisions</h1></div>
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13<p>
14
15The V8 benchmark suite is changed from time to time as we fix bugs or
16expand the scope of the benchmarks.  Here is a list of revisions, with
17a description of the changes made.  Note that benchmark results are
18not comparable unless both results are run with the same revision of
19the benchmark suite.
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21</p>
22<div class="subtitle"><h3>Version 7 (<a href="http://v8.googlecode.com/svn/data/benchmarks/v7/run.html">link</a>)</h3></div>
23
24<p>This version includes the new Navier-Stokes benchmark, a 2D differential
25 equation solver that stresses arithmetic computations on double arrays.</p>
26
27<div class="subtitle"><h3>Version 6 (<a href="http://v8.googlecode.com/svn/data/benchmarks/v6/run.html">link</a>)</h3></div>
28
29<p>Removed dead code from the RayTrace benchmark and fixed a couple of
30typos in the DeltaBlue implementation. Changed the Splay benchmark to
31avoid converting the same numeric key to a string over and over again
32and to avoid inserting and removing the same element repeatedly thus
33increasing pressure on the memory subsystem. Changed the RegExp
34benchmark to exercise the regular expression engine on different input
35strings.</p>
36
37<p>Furthermore, the benchmark runner was changed to run the benchmarks
38for at least a few times to stabilize the reported numbers on slower
39machines.</p>
40
41<div class="subtitle"><h3>Version 5 (<a href="http://v8.googlecode.com/svn/data/benchmarks/v5/run.html">link</a>)</h3></div>
42
43<p>Removed duplicate line in random seed code, and changed the name of
44the Object.prototype.inherits function in the DeltaBlue benchmark to
45inheritsFrom to avoid name clashes when running in Chromium with
46extensions enabled.
47</p>
48
49<div class="subtitle"><h3>Version 4 (<a href="http://v8.googlecode.com/svn/data/benchmarks/v4/run.html">link</a>)</h3></div>
50
51<p>The <i>Splay</i> benchmark is a newcomer in version 4.  It
52manipulates a splay tree by adding and removing data nodes, thus
53exercising the memory management subsystem of the JavaScript engine.
54</p>
55
56<p>
57Furthermore, all the unused parts of the Prototype library were
58removed from the RayTrace benchmark. This does not affect the running
59of the benchmark.
60</p>
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62
63<div class="subtitle"><h3>Version 3 (<a href="http://v8.googlecode.com/svn/data/benchmarks/v3/run.html">link</a>)</h3></div>
64
65<p>Version 3 adds a new benchmark, <i>RegExp</i>.  The RegExp
66benchmark is generated by loading 50 of the most popular pages on the
67web and logging all regexp operations performed.  Each operation is
68given a weight that is calculated from an estimate of the popularity
69of the pages where it occurs and the number of times it is executed
70while loading each page.  Finally the literal letters in the data are
71encoded using ROT13 in a way that does not affect how the regexps
72match their input.
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75
76<div class="subtitle"><h3>Version 2 (<a href="http://v8.googlecode.com/svn/data/benchmarks/v2/run.html">link</a>)</h3></div>
77
78<p>For version 2 the Crypto benchmark was fixed.  Previously, the
79decryption stage was given plaintext as input, which resulted in an
80error.  Now, the decryption stage is given the output of the
81encryption stage as input.  The result is checked against the original
82plaintext.  For this to give the correct results the crypto objects
83are reset for each iteration of the benchmark.  In addition, the size
84of the plain text has been increased a little and the use of
85Math.random() and new Date() to build an RNG pool has been
86removed. </p>
87
88<p>Other benchmarks were fixed to do elementary verification of the
89results of their calculations.  This is to avoid accidentally
90obtaining scores that are the result of an incorrect JavaScript engine
91optimization.</p>
92
93
94<div class="subtitle"><h3>Version 1 (<a href="http://v8.googlecode.com/svn/data/benchmarks/v1/run.html">link</a>)</h3></div>
95
96<p>Initial release.</p>
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