49 lines
2.1 KiB
Markdown
49 lines
2.1 KiB
Markdown
This directory contains two command-line applications *bigtime.js* and *bigtime-OOM.js*, and for the browser *bignumber-vs-bigdecimal.html*, which enable some of the methods of bignumber.js to be tested against the JavaScript translations of the two versions of BigDecimal in the *lib* directory.
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* GWT: java.math.BigDecimal
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<https://github.com/iriscouch/bigdecimal.js>
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* ICU4J: com.ibm.icu.math.BigDecimal
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<https://github.com/dtrebbien/BigDecimal.js>
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The BigDecimal in Node's npm registry is the GWT version. It has some bugs: see the Node script *perf/lib/bigdecimal_GWT/bugs.js* for examples of flaws in its *remainder*, *divide* and *compareTo* methods.
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An example of using *bigtime.js* to compare the time taken by the bignumber.js `plus` method and the GWT BigDecimal `add` method:
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$ node bigtime plus 10000 40
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This will time 10000 calls to each, using operands of up to 40 random digits and will check that the results match.
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For help:
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$ node bigtime -h
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*bigtime-OOM.js* works in the same way, but includes separate timings for object creation and method calls.
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In general, *bigtime.js* is recommended over *bigtime-OOM.js*, which may run out of memory.
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The usage of *bignumber-vs-bigdecimal.html* should be more or less self-explanatory.
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---
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###### Further notes:
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###### bigtime.js
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* Creates random numbers and BigNumber and BigDecimal objects in batches.
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* Unlikely to run out of memory.
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* Doesn't show separate times for object creation and method calls.
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* Tests methods with one or two operands (i.e. includes abs and negate).
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* Doesn't indicate random number creation completion.
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* Doesn't calculate average number of digits of operands.
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* Creates random numbers in exponential notation.
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###### bigtime-OOM.js
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* Creates random numbers and BigNumber and BigDecimal objects all in one go.
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* May run out of memory, e.g. if iterations > 500000 and random digits > 40.
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* Shows separate times for object creation and method calls.
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* Only tests methods with two operands (i.e. no abs or negate).
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* Indicates random number creation completion.
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* Calculates average number of digits of operands.
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* Creates random numbers in normal notation.
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