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performance-nodejs
Advanced tools
Readme
Get nodejs performance, such as: heap statistics, event loop delay
$ npm i performance-nodejs
View the ./examples directory for working examples.
The performance()
function get node.js performance (include event loop, heap statistics and heap space 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.
cpuUsage
is new in node.js v6.x.
malloced_memory
, peak_malloced_memory
and does_zap_garbage
is new in node.js v7.x
// node.js performance
{
"lag": 0,
"heap": {
"total_heap_size": 6,
"total_heap_size_executable": 4,
"total_physical_size": 6,
"total_available_size": 1423,
"used_heap_size": 4,
"heap_size_limit": 1432,
"malloced_memory": 0,
"peak_malloced_memory": 1,
"does_zap_garbage": 0
},
"heapSpace": {
"new_space": {
"size": 2,
"used_size": 0,
"available_size": 1,
"physical_size": 2
},
"old_space": {
"size": 2,
"used_size": 2,
"available_size": 0,
"physical_size": 2
},
"code_space": {
"size": 2,
"used_size": 1,
"available_size": 0,
"physical_size": 1
},
"map_space": {
"size": 1,
"used_size": 0,
"available_size": 0,
"physical_size": 0
},
"large_object_space": {
"size": 0,
"used_size": 0,
"available_size": 1422,
"physical_size": 0
}
},
"cpuUsage": {
"user": 1344,
"system": 197,
"usedPercent": 0,
"userUsedPercent": 0,
"systemUsedPercent": 0,
"total": 477549
},
"memoryUsage": {
"rss": 23,
"heapTotal": 6,
"heapUsed": 4,
"external": 0
}
}
performance((data) => {
console.info(JSON.stringify(data));
}, 'MB', 100);
Convert the result to camelCase
const performance = require('performance-nodejs');
performance.camelCase = true;
performance((data) => {
// {"lag":4,"heap":{"totalHeapSize":6,"totalHeapSizeExecutable":4,"totalPhysicalSize":5 ...
console.info(JSON.stringify(data));
}, 'MB', 100);
Flatten the result
const performance = require('performance-nodejs');
performance.camelCase = true;
performance.flatten = true;
performance((data) => {
// {"lag":1,"heapTotalHeapSize":34639872,"heapTotalHeapSizeExecutable":5767168,"heapTotalPhysicalSize": ...
console.info(JSON.stringify(data));
}, 'MB', 100);
MIT
FAQs
get nodejs performance, such as: heap statistics, event loop delay
The npm package performance-nodejs receives a total of 34 weekly downloads. As such, performance-nodejs popularity was classified as not popular.
We found that performance-nodejs demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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