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約3.8 GBのRAMを搭載したマシン上でnode.js上でXMPPサーバーを実行します。 /opt/node/bin/node --max-old-space-size = 3000 --trace-gc --trace-gc-verbose main.jsnode.jsプロセスでv8のメモリ管理をスマートに設定する
ノードを呼び出すときに渡すコマンドラインパラメータは次のとおりです。しかし、プロセスでは10秒以上のGC休止が頻繁に発生することがあります（GCが動作していても何も処理していないGC停止が1分以上あることがあります）。これが起こると、プロセスは通常のメモリ消費になります。約1 GBのヒープ使用量です。プロセスには約2 GBの空き容量がありますが、プロセスはそれを使用せず、メモリを解放しようとしています。
--trace-gc-verboseオプションで指定されたgcトレースを見ると、約2 GBの空き領域が "Large object space"とマークされていて、使用されません。 。また、「古いポインタ」と「古いデータ空間」のために、より多くのメモリが必要なプロセスがありますが、「大きなオブジェクト空間」からのこの空きメモリは使用されません。ここで
は長いGCポーズがプロセスにあった当時の一つ中にGCが残した痕跡である：
91635809 ms: Mark-sweep 968.8 (1039.0) -> 958.5 (1038.0) MB, 1/410 ms (+ 2287 ms in 79 steps since start of marking, biggest step 140.227051 ms) [idle notification: finalize incremental] [GC in old space requested]. Memory allocator, used: 1088446464, available: 2124390400 New space, used: 192, available: 8388416 Old pointers, used: 633992112, available: 10460240, waste: 0 Old data space, used: 315819248, available: 149776, waste: 0 Code space, used: 5867936, available: 1271392, waste: 0 Map space, used: 10257976, available: 6384072, waste: 0 Cell space, used: 175936, available: 954304, waste: 0 Large object space, used: 51413600, available: 2123325184 91636499 ms: Scavenge 965.5 (1038.0) -> 964.6 (1038.0) MB, 17 ms (+ 109 ms in 10 steps since last GC) [Runtime::PerformGC]. Memory allocator, used: 1088446464, available: 2124390400 New space, used: 41256, available: 2055896 Old pointers, used: 628458688, available: 15993664, waste: 0 Old data space, used: 315821792, available: 147232, waste: 0 Code space, used: 5904256, available: 1235072, waste: 0 Map space, used: 10263072, available: 6378976, waste: 0 Cell space, used: 175936, available: 954304, waste: 0 Large object space, used: 51413600, available: 2123325184 91637979 ms: Scavenge 966.6 (1038.0) -> 964.7 (1038.0) MB, 1 ms (+ 1404 ms in 43 steps since last GC) [Runtime::PerformGC]. Memory allocator, used: 1088446464, available: 2124390400 New space, used: 76736, available: 2020416 Old pointers, used: 628458688, available: 15993664, waste: 0 Old data space, used: 315845520, available: 123504, waste: 0 Code space, used: 5980576, available: 1158752, waste: 0 Map space, used: 10271416, available: 6370632, waste: 0 Cell space, used: 175936, available: 954304, waste: 0 Large object space, used: 51413600, available: 2123325184 91639088 ms: Mark-sweep 965.2 (1038.0) -> 935.8 (1038.0) MB, 1/369 ms (+ 2235 ms in 71 steps since start of marking, biggest step 69.053955 ms) [idle notification: finalize incremental] [GC in old space requested]. Memory allocator, used: 1088446464, available: 2124390400 New space, used: 168, available: 2096984 Old pointers, used: 641099768, available: 3352584, waste: 0 Old data space, used: 315820152, available: 148872, waste: 0 Code space, used: 5862976, available: 1276352, waste: 0 Map space, used: 10256744, available: 6385304, waste: 0 Cell space, used: 175936, available: 954304, waste: 0 Large object space, used: 51413600, available: 2123325184 91640987 ms: Scavenge 966.4 (1038.0) -> 964.5 (1038.0) MB, 1 ms (+ 1275 ms in 36 steps since last GC) [allocation failure]. Memory allocator, used: 1088446464, available: 2124390400 New space, used: 100944, available: 1996208 Old pointers, used: 627957504, available: 16494848, waste: 0 Old data space, used: 315830536, available: 138488, waste: 0 Code space, used: 5951200, available: 1188128, waste: 0 Map space, used: 10266376, available: 6375672, waste: 0 Cell space, used: 175936, available: 954304, waste: 0 Large object space, used: 51413600, available: 2123325184 91641560 ms: Scavenge 966.5 (1038.0) -> 964.8 (1038.0) MB, 2 ms (+ 481 ms in 29 steps since last GC) [Runtime::PerformGC]. Memory allocator, used: 1088446464, available: 2124390400 New space, used: 180712, available: 1916440 Old pointers, used: 627957504, available: 16494848, waste: 0 Old data space, used: 315871432, available: 97592, waste: 0 Code space, used: 6019392, available: 1119936, waste: 0 Map space, used: 10269848, available: 6372200, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2123325184 91642589 ms: Mark-sweep 965.9 (1038.0) -> 947.7 (1038.0) MB, 1/371 ms (+ 2369 ms in 89 steps since start of marking, biggest step 67.302002 ms) [idle notification: finalize incremental] [GC in old space requested]. Memory allocator, used: 1088446464, available: 2124390400 New space, used: 264, available: 2096888 Old pointers, used: 639592840, available: 4859512, waste: 0 Old data space, used: 315849408, available: 119616, waste: 0 Code space, used: 5862976, available: 1276352, waste: 0 Map space, used: 10257136, available: 6384912, waste: 0 Cell space, used: 175936, available: 954304, waste: 0 Large object space, used: 51413600, available: 2123325184 91643688 ms: Scavenge 966.4 (1038.0) -> 964.6 (1038.0) MB, 5 ms (+ 356 ms in 21 steps since last GC) [Runtime::PerformGC]. Memory allocator, used: 1088446464, available: 2124390400 New space, used: 144088, available: 1953064 Old pointers, used: 627748368, available: 16703984, waste: 0 Old data space, used: 315864504, available: 104520, waste: 0 Code space, used: 5990240, available: 1149088, waste: 0 Map space, used: 10264248, available: 6377800, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2123325184 91645276 ms: Scavenge 966.5 (1038.0) -> 964.8 (1039.0) MB, 2 ms (+ 1520 ms in 46 steps since last GC) [allocation failure]. Memory allocator, used: 1089495040, available: 2123341824 New space, used: 108192, available: 1988960 Old pointers, used: 627748368, available: 16703984, waste: 0 Old data space, used: 315978760, available: 1022200, waste: 0 Code space, used: 6039008, available: 1100320, waste: 0 Map space, used: 10274216, available: 6367832, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2122276608 91645577 ms: Scavenge 966.6 (1039.0) -> 965.8 (1039.0) MB, 3 ms (+ 263 ms in 23 steps since last GC) [allocation failure]. Memory allocator, used: 1089495040, available: 2123341824 New space, used: 516168, available: 1580984 Old pointers, used: 627843088, available: 16609264, waste: 0 Old data space, used: 316550680, available: 450280, waste: 0 Code space, used: 6039008, available: 1100320, waste: 0 Map space, used: 10275280, available: 6366768, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2122276608 91645645 ms: Scavenge 967.3 (1039.0) -> 966.8 (1039.0) MB, 5 ms (+ 8 ms in 16 steps since last GC) [allocation failure]. Memory allocator, used: 1089495040, available: 2123341824 New space, used: 1, available: 3182000 Old pointers, used: 627968088, available: 16484264, waste: 0 Old data space, used: 316947304, available: 53656, waste: 0 Code space, used: 6039008, available: 1100320, waste: 0 Map space, used: 10275280, available: 6366768, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2122276608 91645948 ms: Scavenge 969.8 (1039.0) -> 968.6 (1041.0) MB, 9 ms (+ 188 ms in 35 steps since last GC) [allocation failure]. Memory allocator, used: 1091592192, available: 2121244672 New space, used: 1032320, available: 3161984 Old pointers, used: 628219008, available: 16233344, waste: 0 Old data space, used: 318537928, available: 526904, waste: 0 Code space, used: 6039264, available: 1100064, waste: 0 Map space, used: 10276232, available: 6365816, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2120179456 91646093 ms: Scavenge 971.6 (1041.0) -> 970.5 (1042.0) MB, 13 ms (+ 36 ms in 30 steps since last GC) [Runtime::PerformGC]. Memory allocator, used: 1092640768, available: 2120196096 New space, used: 2044456, available: 6344152 Old pointers, used: 628437424, available: 16014928, waste: 0 Old data space, used: 319366376, available: 730392, waste: 0 Code space, used: 6039264, available: 1100064, waste: 0 Map space, used: 10276232, available: 6365816, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2119130880 91646306 ms: Scavenge 976.5 (1042.0) -> 974.7 (1044.0) MB, 1/14 ms (+ 114 ms in 67 steps since last GC) [allocation failure]. Memory allocator, used: 1094737920, available: 2118098944 New space, used: 2064112, available: 6324496 Old pointers, used: 630440024, available: 14, waste: 0 Old data space, used: 321653384, available: 507256, waste: 0 Code space, used: 6055936, available: 1083392, waste: 0 Map space, used: 10278192, available: 6363856, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2117033728 91646386 ms: Scavenge 980.6 (1044.0) -> 979.2 (1046.0) MB, 12 ms (+ 10 ms in 64 steps since last GC) [allocation failure]. Memory allocator, used: 1096835072, available: 2116001792 New space, used: 4127736, available: 12649480 Old pointers, used: 631182984, available: 13269368, waste: 0 Old data space, used: 323586008, available: 638504, waste: 0 Code space, used: 6055936, available: 1083392, waste: 0 Map space, used: 10278192, available: 6363856, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2114936576 Limited new space size due to high promotion rate: 1 MB 91646810 ms: Mark-sweep 979.2 (1046.0) -> 973.2 (1049.0) MB, 1/422 ms (+ 2500 ms in 303 steps since start of marking, biggest step 0.122070 ms) [StackGuard GC request] [GC in old space requested]. Memory allocator, used: 1099980800, available: 2112856064 New space, used: 192, available: 1048384 Old pointers, used: 636894816, available: 9621408, waste: 0 Old data space, used: 325256448, available: 0, waste: 0 Code space, used: 5860928, available: 1278400, waste: 0 Map space, used: 10257976, available: 6384072, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2111790848 91646825 ms: Scavenge 974.2 (1049.0) -> 979.0 (1049.0) MB, 7 ms [allocation failure]. Memory allocator, used: 1099980800, available: 2112856064 New space, used: 257960, available: 790616 Old pointers, used: 635948464, available: 10567760, waste: 0 Old data space, used: 325256448, available: 0, waste: 0 Code space, used: 5873440, available: 1265888, waste: 0 Map space, used: 10258536, available: 6383512, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2111790848 91646834 ms: Scavenge 979.7 (1049.0) -> 980.0 (1049.0) MB, 2 ms [allocation failure]. Memory allocator, used: 1099980800, available: 2112856064 New space, used: 257968, available: 790608 Old pointers, used: 635671408, available: 10844816, waste: 0 Old data space, used: 325256448, available: 0, waste: 0 Code space, used: 5873440, available: 1265888, waste: 0 Map space, used: 10258536, available: 6383512, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2111790848 91646842 ms: Scavenge 980.7 (1049.0) -> 980.6 (1049.0) MB, 2 ms [allocation failure]. Memory allocator, used: 1099980800, available: 2112856064 New space, used: 257960, available: 790616 Old pointers, used: 635493872, available: 11022352, waste: 0 Old data space, used: 325256448, available: 0, waste: 0 Code space, used: 5873440, available: 1265888, waste: 0 Map space, used: 10258536, available: 6383512, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2111790848 91646849 ms: Scavenge 981.3 (1049.0) -> 981.2 (1049.0) MB, 1 ms [allocation failure]. Memory allocator, used: 1099980800, available: 2112856064 New space, used: 257968, available: 790608 Old pointers, used: 635981640, available: 10534584, waste: 0 Old data space, used: 325256448, available: 0, waste: 0 Code space, used: 5873440, available: 1265888, waste: 0 Map space, used: 10258536, available: 6383512, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2111790848 91646863 ms: Scavenge 981.9 (1049.0) -> 981.6 (1051.0) MB, 1 ms [allocation failure]. Memory allocator, used: 1102077952, available: 2110758912 New space, used: 257960, available: 790616 Old pointers, used: 637013288, available: 10534872, waste: 0 Old data space, used: 326288384, available: 0, waste: 0 Code space, used: 5873440, available: 1265888, waste: 0 Map space, used: 10258536, available: 6383512, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2109693696 91651639 ms: Mark-sweep 981.6 (1051.0) -> 924.7 (1051.0) MB, 1/4775 ms [last resort gc]. Memory allocator, used: 1102077952, available: 2110758912 New space, used: 96, available: 1048480 Old pointers, used: 626794192, available: 20753968, waste: 0 Old data space, used: 275760200, available: 50528184, waste: 0 Code space, used: 6182208, available: 957120, waste: 0 Map space, used: 10257808, available: 6384240, waste: 0 Cell space, used: 176192, available: 954048, waste: 0 Large object space, used: 51413600, available: 2109693696 91663655 ms: Mark-sweep 924.7 (1051.0) -> 924.7 (1050.0) MB, 1/12015 ms [last resort gc]. Memory allocator, used: 1101029376, available: 2111807488 New space, used: 0, available: 1048576 Old pointers, used: 626169464, available: 21378696, waste: 0 Old data space, used: 275759960, available: 49496488, waste: 0 Code space, used: 5850624, available: 1288704, waste: 0 Map space, used: 10257808, available: 6384240, waste:
は私がより良いV8のメモリ管理を構成するために行うことができます任意のチューニングはありますか？ここで何が助けになるのでしょうか？
ので、それは直接関係ありませんが、アイドル通知コレクションは*本当に*それは「アイドル」と考えるものについて積極的ですより少ないコレクションで全体的なパフォーマンスが向上するかもしれません。スタートアップパラメータに "--nouse-idle-notification"を追加してください。 – Joe
アップデート： --nouse-idle-notificationオプションを試しましたが、一時停止にはあまり役立たなかった。 そして、サーバーはリアルタイムのXMPP通信用です。多くのライブクライアント/チャットをサポートするユースケースでは、-expose-gcフラグとgcの助けを借りて（）呼び出し。 –