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GCStats\n[![Build Status](https://travis-ci.org/RisingStack/node-gcstats.svg?branch=master)](https://travis-ci.org/RisingStack/node-gcstats)\n\nExposes stats about V8 GC after it has been executed.\n\n# Usage\n\nCreate a new instance of the module and subscribe to `stats`-events from that:\n\n    var gc = (require('gc-stats'))();\n\n    gc.on('stats', function (stats) {\n        console.log('GC happened', stats);\n    });\n\nThis will print blobs like this whenever a GC happened:\n\n    GC happened {\n        pause: 433034,\n        pauseMS: 0,\n        gctype: 1,\n        before: {\n            totalHeapSize: 18635008,\n            totalHeapExecutableSize: 4194304,\n            usedHeapSize: 12222496,\n            heapSizeLimit: 1535115264\n        }, after: {\n            totalHeapSize: 18635008,\n            totalHeapExecutableSize: 4194304,\n            usedHeapSize: 8116600,\n            heapSizeLimit: 1535115264\n        }, diff: {\n            totalHeapSize: 0,\n            totalHeapExecutableSize: 0,\n             usedHeapSize: -4105896,\n            heapSizeLimit: 0\n        }\n    }\n\n## Property insights\n* totalHeapSize: Number of bytes V8 has allocated for the heap. This can grow if usedHeap needs more.\n* usedHeapSize: Number of bytes in use by application data\n* total HeapExecutableSize: Number of bytes for compiled bytecode and JITed code\n* heapSizeLimit: The absolute limit the heap cannot exceed\n* totalPhysicalSize: Commited size (node 0.11+)\n* pause: Nanoseconds from start to end of GC using hrtime()\n* pauseMS: pause expressed in milliseconds\n* gctype can have the following values([v8 source](https://github.com/nodejs/node/blob/master/deps/v8/include/v8.h#L5165-L5172)):\n * 1: Scavenge (minor GC)\n * 2: Mark/Sweep/Compact (major GC)\n * 4: Incremental marking\n * 8: Weak/Phantom callback processing\n * 15: All\n\n# Installation\n\n    npm install gc-stats\n\n# Node version support\nnode-gcstats depends on C++ extensions which are compiled when the *gc-stats* module is installed. Compatibility information can be inspected via the [Travis-CI build jobs](https://travis-ci.org/RisingStack/node-gcstats/).\n","readmeFilename":"README.md","description":"Exposes node v8 garbage collection stats","homepage":"https://github.com/RisingStack/node-gcstats#readme","repository":{"type":"git","url":"git+ssh://git@github.com/RisingStack/node-gcstats.git"},"contributors":[{"name":"David Szakallas","email":"david.szakallas@risingstack.com"}],"bugs":{"url":"https://github.com/RisingStack/node-gcstats/issues"},"license":"Unlicense"}