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doc: add more info to benchmark/README.md #629

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Jan 28, 2015
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doc: add more info to benchmark/README.md #629

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22 changes: 22 additions & 0 deletions benchmark/README.md
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This folder contains benchmark tests to measure the performance for certain
io.js APIs.

## prerequisites

Most of the http benchmarks require `wrk` to be compiled beforehand.

```sh
make wrk
```

## How to run tests

There are two ways to run benchmark tests:
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...
```

3. Run tests with options

This example will run only the first type of url test, with one iteration.
(Note: benchmarks require __many__ iterations to be statistically accurate.)


```sh
iojs benchmark/url/url-parse.js type=one n=1
```
Output:
```
url/url-parse.js type=one n=1: 1663.74402
```

## How to write a benchmark test

The benchmark tests are grouped by types. Each type corresponds to a subdirectory,
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