# performance-nodejs


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  Get nodejs performance, such as: heap statistics, event loop delay

## Installation

```
$ npm i performance-nodejs
```

## Examples
  
View the [./examples](examples) directory for working examples. 


## Description

  The `performance()` function get node.js performance (include event loop and heap statistics). 

```
const timer = performance(fn, interval);
```

* fn: The callback function to execute.

* interval: Check interval, defaulted to 100ms.

* unit: Set the heap format unit, eg: 'B', 'MB', 'GB', '0.0MB' defaulted to 'B'. `0.00MB` means set 2 precision and 'MB' unit.

Returns: A reference to the timer. Useful for clearing the timer. 

`malloced_memory`, `peak_malloced_memory` and `does_zap_garbage` is new in node.js v7.x

```
performance(data => {
  // {"lag":3,"heap":{"total_heap_size":22,"total_heap_size_executable":6,"total_physical_size":22,"total_available_size":1407,"used_heap_size":15,"heap_size_limit":1432,"malloced_memory":0,"peak_malloced_memory":2,"does_zap_garbage":0}}
	console.info(JSON.stringify(data));
}, 'MB', 100);
```

# License

MIT


get nodejs performance, such as: heap statistics, event loop delay. 

Meet the Socket Team at BlackHat and DEF CON in Las Vegas, Aug 4-6

performance-nodejs

get nodejs performance, such as: heap statistics, event loop delay

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performance-nodejs