# HG changeset patch # User Masataka Kohagura # Date 1399957589 -32400 # Node ID b148e2c6b52798e7152e8fc7b179199337b3b7e2 # Parent b5bb18a528e491f0693b0db5f58f74b466d0a8be fix diff -r b5bb18a528e4 -r b148e2c6b527 presen/s6/images/IO_0blockread.png Binary file presen/s6/images/IO_0blockread.png has changed diff -r b5bb18a528e4 -r b148e2c6b527 presen/s6/images/blockread.graffle --- a/presen/s6/images/blockread.graffle Mon May 12 20:19:25 2014 +0900 +++ b/presen/s6/images/blockread.graffle Tue May 13 14:06:29 2014 +0900 @@ -26,7 +26,7 @@ MasterSheets ModificationDate - 2014-05-07 09:40:55 +0000 + 2014-05-12 18:17:07 +0000 Modifier MasaKoha NotesVisible @@ -4673,8 +4673,8 @@ 39 Points - {156.40475685726284, 168.3905879814655} - {294.39883625173712, 169.80510583031423} + {156.40475685706036, 168.39059932958162} + {294.39883619564614, 169.80524245596101} Style @@ -4860,8 +4860,8 @@ 34 Points - {156.40474959914405, 282.76754816232159} - {485.77384207726016, 286.58024789636727} + 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+ 55 + Shape + Rectangle + Style + + fill + + FillType + 2 + GradientAngle + 90 + GradientColor + + w + 0.666667 + + + shadow + + Draws + NO + + + + + Bounds + {{294.28376505406669, 297.62457698632676}, {24.000001907348633, 82.955885870215852}} + Class + ShapedGraphic + ID + 54 + Shape + Rectangle + Style + + fill + + FillType + 2 + GradientAngle + 90 + GradientColor + + w + 0.666667 + + + shadow + + Draws + NO + + + + + Bounds + {{255.28364295930513, 297.62458518428161}, {24.000001907348633, 61.689019802464799}} + Class + ShapedGraphic + ID + 53 + Shape + Rectangle + Style + + fill + + FillType + 2 + GradientAngle + 90 + GradientColor + + w + 0.666667 + + + shadow + + Draws + NO + + + + + Bounds + {{450.2836705518427, 297.62458360236343}, {24.000001907348633, 52.199020841965151}} + Class + ShapedGraphic + ID + 52 + Shape + Rectangle + Style + + fill + + FillType + 2 + GradientAngle + 90 + GradientColor + + w + 0.666667 + + + shadow + + Draws + NO + + + + + Bounds + {{333.28373569974991, 297.62455949148034}, {24.000001907348633, 69.381300533890339}} + Class + ShapedGraphic + ID + 51 + Shape + Rectangle + Style + + fill + + FillType + 2 + GradientAngle + 90 + GradientColor + + w + 0.666667 + + + shadow + + Draws + NO + + + + + Bounds + {{411.28370175315064, 210.00552542171957}, {24.000001907348633, 82.955885870215852}} + Class + ShapedGraphic + ID + 46 + Shape + Rectangle + Style + + fill + + FillType + 2 + GradientAngle + 90 + GradientColor + + w + 0.666667 + + + shadow + + Draws + NO + + + Text + + Text + {\rtf1\ansi\ansicpg932\cocoartf1265\cocoasubrtf190 +\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;} +{\colortbl;\red255\green255\blue255;} +\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc + +\f0\fs24 \cf0 L} + + + + Bounds + {{333.2836856769265, 210.00551506512122}, {24.000001907348633, 61.689019802464799}} + Class + ShapedGraphic + ID + 44 + Shape + Rectangle + Style + + fill + + FillType + 2 + GradientAngle + 90 + GradientColor + + w + 0.666667 + + + shadow + + Draws + NO + + + Text + + Text + {\rtf1\ansi\ansicpg932\cocoartf1265\cocoasubrtf190 +\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;} +{\colortbl;\red255\green255\blue255;} +\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc + +\f0\fs24 \cf0 L} + + + + Bounds + {{294.28368090855514, 210.00551161292165}, {24.000001907348633, 52.199020841965151}} + Class + ShapedGraphic + ID + 43 + Shape + Rectangle + Style + + fill + + FillType + 2 + GradientAngle + 90 + GradientColor + + w + 0.666667 + + + shadow + + Draws + NO + + + Text + + Text + {\rtf1\ansi\ansicpg932\cocoartf1265\cocoasubrtf190 +\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;} +{\colortbl;\red255\green255\blue255;} +\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc + +\f0\fs24 \cf0 L} + + + + Bounds + {{255.28366551352715, 210.00551161292205}, {24.000001907348633, 69.381300533890339}} + Class + ShapedGraphic + ID + 31 + Shape + Rectangle + Style + + fill + + FillType + 2 + GradientAngle + 90 + GradientColor + + w + 0.666667 + + + shadow + + Draws + NO + + + Text + + Text + {\rtf1\ansi\ansicpg932\cocoartf1265\cocoasubrtf190 +\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;} +{\colortbl;\red255\green255\blue255;} +\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc + +\f0\fs24 \cf0 L} + + + + AllowToConnect + + Class + LineGraphic + ID + 41 + Points + + {105.8635223476933, 209.87586294180878} + {233.64078633139812, 209.87586294180878} + + Style + + stroke + + HeadArrow + FilledArrow + Legacy + + LineType + 1 + TailArrow + 0 + + + + + Bounds + {{82.004255209435826, 121.83994580512632}, {24.000001907348633, 87.619056701660156}} + Class + ShapedGraphic + ID + 36 + Line + + ID + 5 + Position + 0.22730126976966858 + RotationType + 0 + + Shape + Rectangle + Style + + shadow + + Draws + NO + + + + + Bounds + {{81.951218965862168, 210.14711099933152}, {24.000001907348633, 87.619056701660156}} + Class + ShapedGraphic + ID + 30 + Line + + ID + 5 + Position + 0.51846694946289062 + RotationType + 0 + + Shape + Rectangle + Style + + shadow + + Draws + NO + + + + + Class + LineGraphic + ID + 5 + Points + + {94.045659413386105, 96.71164192397309} + {93.863507988020501, 400.00001467191305} + + Style + + stroke + + HeadArrow + 0 + Legacy + + Pattern + 1 + TailArrow + 0 + + + Tail + + ID + 1 + + + + Bounds + {{3.4965036247544852, 62.937065245580733}, {181.118896484375, 33.274576758980579}} + Class + ShapedGraphic + ID + 1 + Shape + Rectangle + Style + + shadow + + Draws + NO + + + Text + + Text + {\rtf1\ansi\ansicpg932\cocoartf1265\cocoasubrtf190 +\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;} +{\colortbl;\red255\green255\blue255;} +\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc + +\f0\fs36 \cf0 Blocked Read Task} + + + + Bounds + {{233.64078633139812, 210.00552645144344}, {259.75399780273438, 87.619033813476562}} + Class + ShapedGraphic + ID + 4 + Shape + Rectangle + Style + + shadow + + Draws + NO + + stroke + + CornerRadius + 9 + Width + 3 + + + + + Bounds + {{233.64077155563095, 298.49176544515984}, {259.75399780273438, 90.48109913188884}} + Class + ShapedGraphic + ID + 59 + Shape + Rectangle + Style + + shadow + + Draws + NO + + stroke + + CornerRadius + 9 + Width + 3 + + + + + Class + LineGraphic + ID + 62 + Points + + {363.6416317950048, 95.27520728934617} + {366.28377599225843, 401.85935783255434} + + Style + + stroke + + HeadArrow + 0 + Legacy + + Pattern + 1 + TailArrow + 0 + + + Tail + + ID + 61 + + + + Class + LineGraphic + ID + 42 + Points + + {233.64078633139812, 209.87586294180878} + {505.99795122781262, 210.00551111837237} + + Style + + stroke + + HeadArrow + 0 + Legacy + + LineType + 1 + Pattern + 1 + TailArrow + 0 + + + Tail + + ID + 41 + Info + 1 + + + + Class + LineGraphic + ID + 50 + Points + + {233.64078633139812, 297.49491664402046} + {505.99793701874131, 297.62456482058417} + + Style + + stroke + + HeadArrow + 0 + Legacy + + LineType + 1 + Pattern + 1 + TailArrow + 0 + + + Tail + + ID + 49 + Info + 1 + + + + Bounds + {{56.906827625466661, 7.6916252050281742}, {74.125877380371094, 430.76925659179688}} + Class + ShapedGraphic + ID + 28 + Line + + ID + 5 + Position + 0.41664838790893555 + RotationType + 0 + + Shape + Circle + Style + + shadow + + Draws + NO + + stroke + + Color + + b + 0 + g + 0 + r + 1 + + Width + 2 + + + Text + + VerticalPad + 0 + + + + Bounds + {{222.37763917708662, 7.6916267745783102}, {280.41958618164062, 430.76925659179688}} + Class + ShapedGraphic + ID + 73 + Line + + ID + 62 + Position + 0.40549075603485107 + RotationType + 0 + + Shape + Circle + Style + + shadow + + Draws + NO + + + Text + + VerticalPad + 0 + + + + GridInfo + + HPages + 2 + KeepToScale + + Layers + + + Lock + NO + Name + レイヤー 1 + Print + YES + View + YES + + + LayoutInfo + + Animate + NO + circoMinDist + 18 + circoSeparation + 0.0 + layoutEngine + dot + neatoSeparation + 0.0 + twopiSeparation + 0.0 + + Orientation + 2 + PrintOnePage + + RowAlign + 1 + RowSpacing + 36 + SheetTitle + キャンバス 13 + UniqueID + 13 + VPages + 1 + + + ActiveLayerIndex + 0 + AutoAdjust + + BackgroundGraphic + + Bounds + {{0, 0}, {1117.9999465942383, 783}} + Class + SolidGraphic + ID + 2 + Style + + shadow + + Draws + NO + + stroke + + Draws + NO + + + + BaseZoom + 0 + CanvasOrigin + {0, 0} + ColumnAlign + 1 + ColumnSpacing + 36 + DisplayScale + 1 0/72 in = 1.0000 in + GraphicsList + + + Bounds {{63.275233031602809, 222.56465530395488}, {42.285714285714278, 14}} Class ShapedGraphic @@ -12618,8 +16571,8 @@ 15 Points - {364.4963648691047, 137.24477680110266} - {294.95698748812407, 194.01852663315302} + {364.50469817159257, 137.2448387209769} + {294.98789845712707, 194.01867858661512} Style @@ -12664,8 +16617,8 @@ 14 Points - {258.05495535164403, 137.42844521167359} - {256.80807263658227, 193.83508024564875} + {258.06366670123106, 137.42844969278062} + {256.83993340827556, 193.83509077080566} Style @@ -12699,8 +16652,8 @@ 13 Points - {162.24228623775539, 137.2715135821046} - {222.42165219511438, 193.99229393749167} + {162.25066470865445, 137.27144490726599} + {222.45267678474821, 193.99212578998814} Style @@ -12967,11 +16920,11 @@ WindowInfo CurrentSheet - 3 + 10 ExpandedCanvases Frame - {{1021, 614}, {1300, 878}} + {{400, 300}, {1300, 878}} ListView OutlineWidth @@ -12985,9 +16938,9 @@ SidebarWidth 120 VisibleRegion - {{-53, 0}, {665.71428571428567, 422.28571428571428}} + {{0, 0}, {814.68534456779503, 516.78323573871285}} Zoom - 1.75 + 1.4299999475479126 ZoomValues @@ -13040,6 +16993,21 @@ 1.75 1 + + キャンバス 11 + 1.4299999475479126 + 1.4700000286102295 + + + キャンバス 12 + 1.4299999475479126 + 1 + + + キャンバス 13 + 1.4299999475479126 + 1 + diff -r b5bb18a528e4 -r b148e2c6b527 presen/s6/images/blockread.png Binary file presen/s6/images/blockread.png has changed diff -r b5bb18a528e4 -r b148e2c6b527 presen/s6/images/divide_read.png Binary file presen/s6/images/divide_read.png has changed diff -r b5bb18a528e4 -r b148e2c6b527 presen/s6/index.html --- a/presen/s6/index.html Mon May 12 20:19:25 2014 +0900 +++ b/presen/s6/index.html Tue May 13 14:06:29 2014 +0900 @@ -111,17 +111,87 @@ + + + +
+

はじめに

+

+ ファイルを読み込んで計算を行うようなアプリケーションは、I/O の速度を無視することができない。 + ファイルを全て読み込んでから並列計算をすると、読み込んでいる時間がオーバーヘッドとなってしまう。 +

+

+ 本研究室では、並列プログラミングフレームワーク Cerium を使用することによって並列計算を可能にしているが、Cerium で I/O と並列計算を同時に走らせるにはどのように実装すればいいか考慮した。 +

+
    +
  1. + I/O と並列計算を同時に動作させる。 +
    2. +
  2. + I/O は連続で動作させる。 +
    3. +
+ +

+ 上記 2点を実装して、I/O と並列計算が同時に実行し、なおかつ I/O の処理を乱されないようにすることによって、全体のパフォーマンスを上げたい。 +

+
+ + +
+

I/O の読み込み方法

+
    +
  1. + mmap 後に並列計算 +
    2. +
  2. + read 後に並列計算 +
    3. +
  3. + read と 並列計算 が同時に実行 +
    4. +
+ +
+ +

I/Oを含むアプリケーションの並列化

ファイル内の文字列検索を行うようなプログラムを走らせたとき、 - 文字列検索よりもファイルの読み込みに時間がかかることが多い。 + 文字列検索よりもファイルの読み込みに時間がかかることが多い。

I/O は、ディスクからの読み込む時間がかかる。
- -> I/O をどのように実装したら速くできるか?
+ -> I/O をどのように実装したら、並列処理とI/Oが干渉をなくして全体のパフォーマンスを上げれるか??

@@ -132,7 +202,7 @@

  • ファイル読み込みとアプリケーションの分離するための実装法
  • I/O専用の Threadを追加
    • -
  • 様々なファイル読み込み方法と様々な実験環境にて計測
    • +
  • mmap と比較や、様々な実験環境で計測

以上3点を行った。 @@ -170,13 +240,13 @@

-

Block 単位の読み込みと並列計算

+

大きなファイルに対するデータ並列


  1. ファイルをある一定の大きさずつ読み込む
    2. -
  2. 読み込んだテキストファイルに対して、それぞれ WordCount を行う
    3. -
  3. WordCount の結果を集計する
    4. +
  4. 読み込んだテキストファイルに対して、それぞれ 並列計算 を行う
    5. +
  5. 並列計算の結果を集計する
@@ -205,13 +275,18 @@

mmap を使用せずに、read を独立したスレッドで実行させる。そして、読み込んだ部分に対して Word Count を並列に起動する。


- + +
  • read は全て読み込み終えるまで連続で動作しファイルを読み込む
  • read の待ちは CPU を消費しない
  • 読み込み終わったブロックに対して、Word Count を起動する
    • +
  • + WordCount Task を一度に全て生成すると、その Task でメモリを圧迫するので、 + ある程度の数でまとめた Block という単位で徐々に Task を起動していく。 +
@@ -219,14 +294,11 @@

Blocked Read の実装


+
  • - WordCount Task を一度に全て生成すると、その Task でメモリを圧迫するので、 - ある程度の数でまとめた Block という単位で徐々に Task を起動していく。 -
    • -
  • 読み込んでいない部分に Word Count が走らないように、Blocked Read Task が読み込み終わるまで、Task Blockを待たせる。
    • -

    実験(2/5) : Word Count を GPU で走らせてみた

    - -Blocked read Task 1つ当たりの読み込み量 : 16 kbyte * 48 - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    read modetime(s)
    mmap
    103.410
    read
    106.050
    Blocked Read(SPE_ANY)
    94.626
    Blocked Read(IO_0)
    94.496
    - - -
    -

    実験(3/5): Blocked Read size を変更してみる

    - +

    実験2: Blocked Read size を変更してみる

    +

    Blocked read Task 1つ当たりの読み込み量 : 128 kbyte * 48 +

    @@ -465,11 +519,64 @@
    +

    +実験1との比較
    +Blocked read Task 1つ当たりの読み込み量 : 16 kbyte * 48 +

    + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
    read mode \ CPU numCPU 1CPU 4CPU 8CPU 12
    mmap15.35311.28711.70711.137
    read16.84611.73011.48711.437
    Blocked Read(SPE_ANY)13.29711.98410.88711.146
    Blocked Read(IO_0)11.50311.43711.36511.412
    -

    実験(4/5): CPU 数を固定して、Blocked Read size を変更してみる

    - Word Count Task 1つ当たりの処理量を 4kByte ~ 256kByte で変化させてみた。 +

    実験3: CPU 数を固定して、Blocked Read size を変更してみる

    +

    + word count task 1つ当たりの処理量を 4kbyte ~ 256kbyte で変化させてみた。 +

    +

    + CPU 12 で全て測定している。 +

    @@ -536,7 +643,7 @@
    -

    実験(5/5): コンピュータを替えてみた

    +

    実験4: 別のコンピュータにて測定

    実験環境

    • OS : Cent OS 6.5
      • @@ -544,8 +651,13 @@
    • Memory : 16GB
    • HDD : 2TB 7200 rpm SATA 6.0 Gbps
    - +

    +

    +ファイルをキャッシュから追い出すために、以下のコマンドを実行した。 + 

    % sysctl -w vm.drop_caches=3
    +

    Blocked read Task 1つ当たりの読み込み量 : 16 kbyte * 48 +

    @@ -555,7 +667,7 @@ - + @@ -599,6 +711,57 @@
    CPU 2 CPU 3 CPU 4Thread 8CPU 8
    mmap
    +

    +実験1の測定結果 +

    + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
    read mode \ CPU numCPU 1CPU 4CPU 8CPU 12
    mmap15.35311.28711.70711.137
    read16.84611.73011.48711.437
    Blocked Read(SPE_ANY)13.29711.98410.88711.146
    Blocked Read(IO_0)11.50311.43711.36511.412