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Benchmark source http://spion.github.io/posts/analysis-generators-and-other-async-patterns-node.html
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$ node performance.js -t 1 -n 10000 ./examples/promiseishQ.js
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benchmarking ./examples/promiseishQ.js
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{"time":14438,"mem":516.59375,"errors":0,"lastErr":null}
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results for 10000 parallel executions, 1 ms per I/O op
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file            time(ms)  memory(MB)
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promiseishQ.js     14438      516.59
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promiseishQ.js     14438      516.59
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$ node performance.js -t 1 -n 10000 ./examples/async.js
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benchmarking ./examples/async.js
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{"time":876,"mem":55.0625,"errors":0,"lastErr":null}
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results for 10000 parallel executions, 1 ms per I/O op
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file      time(ms)  memory(MB)
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async.js       876       55.06