Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/disk/IOStats.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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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 } |