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).
- If node.js support v8.getHeapSpaceStatistics(), the heap space will be return.
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'.
0.00MBmeans 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
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