From 5cad6e40c4e330a7894da504fe087ddfeb418ea6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Garc=C3=ADa=20Aubert?=
 <danielgarciaaubert@gmail.com>
Date: Thu, 3 Jan 2019 11:47:54 +0100
Subject: [PATCH] Get GC stats from dedicated binding

---
 app.js            |  41 ++++-
 package-lock.json | 416 ++++++++++++++++++++++++++++++++++++++++++++++
 package.json      |   3 +-
 3 files changed, 457 insertions(+), 3 deletions(-)

diff --git a/app.js b/app.js
index c8cd991b..f4de15fe 100755
--- a/app.js
+++ b/app.js
@@ -188,9 +188,46 @@ if (global.gc) {
 
     if (gcInterval > 0) {
         setInterval(function gcForcedCycle() {
-            var start = Date.now();
             global.gc();
-            global.statsClient.timing('windshaft.gc', Date.now() - start);
         }, gcInterval);
     }
 }
+
+const gcStats = require('gc-stats')();
+
+gcStats.on('stats', function ({ pauseMS, gctype }) {
+    global.statsClient.timing('windshaft.gc', pauseMS);
+    global.statsClient.timing(`windshaft.gctype.${getGCTypeValue(gctype)}`, pauseMS);
+});
+
+function getGCTypeValue (type) {
+    // 1: Scavenge (minor GC)
+    // 2: Mark/Sweep/Compact (major GC)
+    // 4: Incremental marking
+    // 8: Weak/Phantom callback processing
+    // 15: All
+    let value;
+
+    switch (type) {
+        case 1:
+            value = 'Scavenge';
+            break;
+        case 2:
+            value = 'MarkSweepCompact';
+            break;
+        case 4:
+            value = 'IncrementalMarking';
+            break;
+        case 8:
+            value = 'ProcessWeakCallbacks';
+            break;
+        case 15:
+            value = 'All';
+            break;
+        default:
+            value = 'Unkown';
+            break;
+    }
+
+    return value;
+}
diff --git a/package-lock.json b/package-lock.json
index aa42f121..43700555 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1099,6 +1099,422 @@
         "wide-align": "^1.1.0"
       }
     },
+    "gc-stats": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/gc-stats/-/gc-stats-1.2.1.tgz",
+      "integrity": "sha512-CPQfMBQPGkqG4upxCn4zHxYZo20woPClSeqnC/WK8pFqlfAtz6zpxbOfnmxOIDYiC26H/pYlWQfdoPVGoqxFUA==",
+      "requires": {
+        "nan": "^2.10.0",
+        "node-pre-gyp": "^0.11.0"
+      },
+      "dependencies": {
+        "abbrev": {
+          "version": "1.1.1",
+          "bundled": true
+        },
+        "ansi-regex": {
+          "version": "2.1.1",
+          "bundled": true
+        },
+        "aproba": {
+          "version": "1.2.0",
+          "bundled": true
+        },
+        "are-we-there-yet": {
+          "version": "1.1.5",
+          "bundled": true,
+          "requires": {
+            "delegates": "^1.0.0",
+            "readable-stream": "^2.0.6"
+          }
+        },
+        "balanced-match": {
+          "version": "1.0.0",
+          "bundled": true
+        },
+        "brace-expansion": {
+          "version": "1.1.11",
+          "bundled": true,
+          "requires": {
+            "balanced-match": "^1.0.0",
+            "concat-map": "0.0.1"
+          }
+        },
+        "chownr": {
+          "version": "1.1.1",
+          "bundled": true
+        },
+        "code-point-at": {
+          "version": "1.1.0",
+          "bundled": true
+        },
+        "concat-map": {
+          "version": "0.0.1",
+          "bundled": true
+        },
+        "console-control-strings": {
+          "version": "1.1.0",
+          "bundled": true
+        },
+        "core-util-is": {
+          "version": "1.0.2",
+          "bundled": true
+        },
+        "debug": {
+          "version": "2.6.9",
+          "bundled": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "deep-extend": {
+          "version": "0.6.0",
+          "bundled": true
+        },
+        "delegates": {
+          "version": "1.0.0",
+          "bundled": true
+        },
+        "detect-libc": {
+          "version": "1.0.3",
+          "bundled": true
+        },
+        "fs-minipass": {
+          "version": "1.2.5",
+          "bundled": true,
+          "requires": {
+            "minipass": "^2.2.1"
+          }
+        },
+        "fs.realpath": {
+          "version": "1.0.0",
+          "bundled": true
+        },
+        "gauge": {
+          "version": "2.7.4",
+          "bundled": true,
+          "requires": {
+            "aproba": "^1.0.3",
+            "console-control-strings": "^1.0.0",
+            "has-unicode": "^2.0.0",
+            "object-assign": "^4.1.0",
+            "signal-exit": "^3.0.0",
+            "string-width": "^1.0.1",
+            "strip-ansi": "^3.0.1",
+            "wide-align": "^1.1.0"
+          }
+        },
+        "glob": {
+          "version": "7.1.2",
+          "bundled": true,
+          "requires": {
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
+          }
+        },
+        "has-unicode": {
+          "version": "2.0.1",
+          "bundled": true
+        },
+        "iconv-lite": {
+          "version": "0.4.24",
+          "bundled": true,
+          "requires": {
+            "safer-buffer": ">= 2.1.2 < 3"
+          }
+        },
+        "ignore-walk": {
+          "version": "3.0.1",
+          "bundled": true,
+          "requires": {
+            "minimatch": "^3.0.4"
+          }
+        },
+        "inflight": {
+          "version": "1.0.6",
+          "bundled": true,
+          "requires": {
+            "once": "^1.3.0",
+            "wrappy": "1"
+          }
+        },
+        "inherits": {
+          "version": "2.0.3",
+          "bundled": true
+        },
+        "ini": {
+          "version": "1.3.5",
+          "bundled": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "bundled": true,
+          "requires": {
+            "number-is-nan": "^1.0.0"
+          }
+        },
+        "isarray": {
+          "version": "1.0.0",
+          "bundled": true
+        },
+        "minimatch": {
+          "version": "3.0.4",
+          "bundled": true,
+          "requires": {
+            "brace-expansion": "^1.1.7"
+          }
+        },
+        "minimist": {
+          "version": "0.0.8",
+          "bundled": true
+        },
+        "minipass": {
+          "version": "2.3.5",
+          "bundled": true,
+          "requires": {
+            "safe-buffer": "^5.1.2",
+            "yallist": "^3.0.0"
+          }
+        },
+        "minizlib": {
+          "version": "1.1.1",
+          "bundled": true,
+          "requires": {
+            "minipass": "^2.2.1"
+          }
+        },
+        "mkdirp": {
+          "version": "0.5.1",
+          "bundled": true,
+          "requires": {
+            "minimist": "0.0.8"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "bundled": true
+        },
+        "needle": {
+          "version": "2.2.4",
+          "bundled": true,
+          "requires": {
+            "debug": "^2.1.2",
+            "iconv-lite": "^0.4.4",
+            "sax": "^1.2.4"
+          },
+          "dependencies": {
+            "sax": {
+              "version": "1.2.4",
+              "bundled": true
+            }
+          }
+        },
+        "node-pre-gyp": {
+          "version": "0.11.0",
+          "bundled": true,
+          "requires": {
+            "detect-libc": "^1.0.2",
+            "mkdirp": "^0.5.1",
+            "needle": "^2.2.1",
+            "nopt": "^4.0.1",
+            "npm-packlist": "^1.1.6",
+            "npmlog": "^4.0.2",
+            "rc": "^1.2.7",
+            "rimraf": "^2.6.1",
+            "semver": "^5.3.0",
+            "tar": "^4"
+          }
+        },
+        "nopt": {
+          "version": "4.0.1",
+          "bundled": true,
+          "requires": {
+            "abbrev": "1",
+            "osenv": "^0.1.4"
+          }
+        },
+        "npm-bundled": {
+          "version": "1.0.5",
+          "bundled": true
+        },
+        "npm-packlist": {
+          "version": "1.1.12",
+          "bundled": true,
+          "requires": {
+            "ignore-walk": "^3.0.1",
+            "npm-bundled": "^1.0.1"
+          }
+        },
+        "npmlog": {
+          "version": "4.1.2",
+          "bundled": true,
+          "requires": {
+            "are-we-there-yet": "~1.1.2",
+            "console-control-strings": "~1.1.0",
+            "gauge": "~2.7.3",
+            "set-blocking": "~2.0.0"
+          }
+        },
+        "number-is-nan": {
+          "version": "1.0.1",
+          "bundled": true
+        },
+        "object-assign": {
+          "version": "4.1.1",
+          "bundled": true
+        },
+        "once": {
+          "version": "1.4.0",
+          "bundled": true,
+          "requires": {
+            "wrappy": "1"
+          }
+        },
+        "os-homedir": {
+          "version": "1.0.2",
+          "bundled": true
+        },
+        "os-tmpdir": {
+          "version": "1.0.2",
+          "bundled": true
+        },
+        "osenv": {
+          "version": "0.1.5",
+          "bundled": true,
+          "requires": {
+            "os-homedir": "^1.0.0",
+            "os-tmpdir": "^1.0.0"
+          }
+        },
+        "path-is-absolute": {
+          "version": "1.0.1",
+          "bundled": true
+        },
+        "process-nextick-args": {
+          "version": "2.0.0",
+          "bundled": true
+        },
+        "rc": {
+          "version": "1.2.8",
+          "bundled": true,
+          "requires": {
+            "deep-extend": "^0.6.0",
+            "ini": "~1.3.0",
+            "minimist": "^1.2.0",
+            "strip-json-comments": "~2.0.1"
+          },
+          "dependencies": {
+            "minimist": {
+              "version": "1.2.0",
+              "bundled": true
+            }
+          }
+        },
+        "readable-stream": {
+          "version": "2.3.6",
+          "bundled": true,
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
+          }
+        },
+        "rimraf": {
+          "version": "2.6.2",
+          "bundled": true,
+          "requires": {
+            "glob": "^7.0.5"
+          }
+        },
+        "safe-buffer": {
+          "version": "5.1.2",
+          "bundled": true
+        },
+        "safer-buffer": {
+          "version": "2.1.2",
+          "bundled": true
+        },
+        "semver": {
+          "version": "5.5.0",
+          "bundled": true
+        },
+        "set-blocking": {
+          "version": "2.0.0",
+          "bundled": true
+        },
+        "signal-exit": {
+          "version": "3.0.2",
+          "bundled": true
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "bundled": true,
+          "requires": {
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
+          }
+        },
+        "string_decoder": {
+          "version": "1.1.1",
+          "bundled": true,
+          "requires": {
+            "safe-buffer": "~5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "bundled": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        },
+        "strip-json-comments": {
+          "version": "2.0.1",
+          "bundled": true
+        },
+        "tar": {
+          "version": "4.4.6",
+          "bundled": true,
+          "requires": {
+            "chownr": "^1.0.1",
+            "fs-minipass": "^1.2.5",
+            "minipass": "^2.3.3",
+            "minizlib": "^1.1.0",
+            "mkdirp": "^0.5.0",
+            "safe-buffer": "^5.1.2",
+            "yallist": "^3.0.2"
+          }
+        },
+        "util-deprecate": {
+          "version": "1.0.2",
+          "bundled": true
+        },
+        "wide-align": {
+          "version": "1.1.3",
+          "bundled": true,
+          "requires": {
+            "string-width": "^1.0.2 || 2"
+          }
+        },
+        "wrappy": {
+          "version": "1.0.2",
+          "bundled": true
+        },
+        "yallist": {
+          "version": "3.0.2",
+          "bundled": true
+        }
+      }
+    },
     "gdal": {
       "version": "0.9.8",
       "resolved": "https://registry.npmjs.org/gdal/-/gdal-0.9.8.tgz",
diff --git a/package.json b/package.json
index 5f0e28f3..efad1d47 100644
--- a/package.json
+++ b/package.json
@@ -35,6 +35,7 @@
     "dot": "1.1.2",
     "express": "4.16.3",
     "fastly-purge": "1.0.1",
+    "gc-stats": "1.2.1",
     "glob": "7.1.2",
     "log4js": "github:cartodb/log4js-node#cdb",
     "lru-cache": "4.1.3",
@@ -73,5 +74,5 @@
     "node": "6.9.2 || >= 10.14.2",
     "npm": "3.10.9 || 3.10.10 || >= 6.4.1",
     "yarn": "0.27.5"
-}
+  }
 }