# V8 Benchmark Suite Revisions

The V8 benchmark suite is changed from time to time as we fix bugs or expand the scope of the benchmarks. Here is a list of revisions, with a description of the changes made. Note that benchmark results are not comparable unless both results are run with the same revision of the benchmark suite.

### Version 3 (link)

Version 3 adds a new benchmark, RegExp. The RegExp benchmark is generated by loading 50 of the most popular pages on the web and logging all regexp operations performed. Each operation is given a weight that is calculated from an estimate of the popularity of the pages where it occurs and the number of times it is executed while loading each page. Finally the literal letters in the data are encoded using ROT13 in a way that does not affect how the regexps match their input.

### Version 2 (link)

For version 2 the crypto benchmark was fixed. Previously, the decryption stage was given plaintext as input, which resulted in an error. Now, the decryption stage is given the output of the encryption stage as input. The result is checked against the original plaintext. For this to give the correct results the crypto objects are reset for each iteration of the benchmark. In addition, the size of the plain text has been increased a little and the use of Math.random() and new Date() to build an RNG pool has been removed.

Other benchmarks were fixed to do elementary verification of the results of their calculations. This is to avoid accidentally obtaining scores that are the result of an incorrect JavaScript engine optimization.

### Version 1 (link)

Initial release.