Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/disk/IOStats.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
children
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1 package org.dancres.blitz.disk;
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2
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3 import java.util.logging.Level;
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4
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5 class IOStats {
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6 private int theAsyncInCount;
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7 private int theAsyncOutCount;
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8
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9 private double theSampleStartTime;
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10
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11 private double theTimePerOut;
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12 private double theTimePerIn;
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13
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14 private double theInOutLag;
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15 private double theInOutRatio;
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16
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17 private int theQueueSize;
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18
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19 double getTimePerIn() {
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20 return theTimePerIn;
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21 }
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22
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23 double getTimePerOut() {
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24 return theTimePerOut;
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25 }
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26
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27 double getInOutRatio() {
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28 return theInOutRatio;
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29 }
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30
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31 void incAsyncInCount() {
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32 synchronized(this) {
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33 ++theAsyncInCount;
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34 ++theQueueSize;
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35 }
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36 }
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37
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38 int getQueueSize() {
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39 synchronized(this) {
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40 return theQueueSize;
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41 }
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42 }
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43
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44 /**
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45 @return <code>true</code> if the io statistics were updated, <code>
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46 false</code> otherwise.
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47 */
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48 boolean incAsyncOutCount() {
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49 synchronized(this) {
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50 if (theAsyncOutCount == 0)
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51 theSampleStartTime = (double) System.currentTimeMillis();
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52
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53 ++theAsyncOutCount;
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54 --theQueueSize;
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55
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56 /*
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57 Probably this should be based on low watermark so the
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58 calculation is available before the high watermark is hit.
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59 Probably ought to remove desired pending count as well at some
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60 point.
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61 */
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62 if (theAsyncOutCount == 1000) {
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63 double myDuration = (double) System.currentTimeMillis() -
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64 theSampleStartTime;
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65
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66 theTimePerOut = myDuration / 1000.0;
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67 theTimePerIn = myDuration / (double) theAsyncInCount;
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68
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69 theInOutLag = theTimePerOut - theTimePerIn;
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70 theInOutRatio = theTimePerOut / theTimePerIn;
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71
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72 theAsyncOutCount = theAsyncInCount = 0;
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73
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74 return true;
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75 }
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76
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77 return false;
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78 }
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79 }
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80
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81 void dumpStats() {
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82 synchronized(this) {
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83 WriteDaemon.theLogger.log(Level.INFO, "TPI: " + theTimePerIn +
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84 " TPO: " + theTimePerOut + " IOL: " + theInOutLag +
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85 " IOR: " + theInOutRatio + " QSZ: " + theQueueSize);
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86 }
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87 }
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88 }