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3 <html> |
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4 <head> |
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5 <meta http-equiv="content-type" content="text/html; charset=UTF-8"> |
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6 <title>Performance Counters View</title> |
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7 <link href="../../../book.css" rel="stylesheet" type="text/css"> |
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8 </head> |
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9 |
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10 <body> |
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11 <h2>Performance Counters View</h2> |
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12 |
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13 <p>Use the <strong>Performance Counters</strong> view to display information on |
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14 performance counter traces. By default, the Performance Counters view opens up |
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15 as minimised on the PIAnalyzer main view. To view the graphs, click the restore |
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16 button <img src="images\minimize_restore_graph.png" width="16" height="16"> or |
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17 the maximize button <img src="images\maximize_graph.png" width="16" |
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18 height="16"> on the Title bar.</p> |
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19 |
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20 <p>The Performance Counters displayed in the view include two user selected |
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21 traces (A and B in Figure 1) and CPU cycles (C in Figure 1). A MIPS (Million |
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22 Instructions Per Second) counter is also available if <b>Instructions |
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23 executed</b> has been selected as one of the traces.</p> |
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24 |
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25 <p>You can select which traces are displayed in the graphs view by clicking the |
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26 check box next to the trace name in the legend table below the graphs. When |
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27 several traces are selected, a separate graph line is displayed for each trace, |
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28 as shown in Figure 1. </p> |
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29 |
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30 <p>In the top left-hand corner of each graph line, the following information |
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31 displayed:</p> |
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32 <ul> |
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33 <li>type of the trace,</li> |
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34 <li>the sampling interval (1 sample per millisecond in Figure 1),</li> |
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35 <li>the minimum and maximum values over the whole duration of the trace. |
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36 (Note that the legend table lists the minimum and maximum values only for |
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37 the selected timeframe.) </li> |
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38 </ul> |
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39 |
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40 <p>Note that the scaling of the graphs changes according to the maximum values |
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41 for each graph. You can see the vertical axis values for each graph on the left |
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42 side of the graph.</p> |
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43 |
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44 <p>A legend table is displayed below the graphs.</p> |
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45 |
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46 <p align="center"><img |
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47 src="images/performance_counters_view_all_graphs.png"></p> |
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48 |
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49 <p class="figure">Figure 1. Performance Counters view with all trace graphs |
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50 displayed</p> |
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51 |
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52 <p></p> |
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53 |
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54 <p>Description of the table columns: </p> |
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55 <ul> |
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56 <li>The <b>Char</b> column contains an identifier for each trace.</li> |
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57 <li>The <b>Name</b> column contains the type of performance counter that was |
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58 traced.</li> |
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59 <li>The <b>Average (1/ms)</b> column contains the average occurrence of the |
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60 event that was traced, within the selected timeframe (for example, the |
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61 average number of cache misses per millisecond, as shown in Figure 1).</li> |
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62 <li>The <b>Sum</b> column contains the total number of event occurrences |
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63 within the selected timeframe. (not included for MIPS)</li> |
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64 <li>The <b>Min (1/ms)</b> column contains the minimum occurrence of the event |
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65 that was traced, within the selected timeframe (for example, minimum number |
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66 of data stalls per millisecond, as show in Figure 1).</li> |
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67 <li>The <b>Max (1/ms)</b> column contains the maximum occurrence of the event |
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68 that was traced, within the selected timeframe (for example, maximum number |
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69 of data stalls per millisecond, as show in Figure 1).</li> |
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70 <li>The <b>Per A</b> / <b>Per B</b> / <b>Per C</b> columns show the ratio of |
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71 the values of the different traces (For example, Per A shows the number of |
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72 events in the sum column of each trace divided by the sum of trace A). (not |
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73 included for MIPS)</li> |
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74 </ul> |
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75 |
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76 <p>Check the boxes at the right side of the table to select the traces for the |
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77 graphs view.</p> |
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78 |
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79 <p>Columns may be reordered, resized, and sorted by clicking or dragging column |
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80 headers.</p> |
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81 |
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82 <p>You can right-click on the table to open a context menu, where you can |
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83 select to copy either selected lines or the entire table to clipboard; or to |
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84 save the table to CSV format. </p> |
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85 <br> |
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86 |
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87 |
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88 <p><strong>MIPS counter and graph</strong></p> |
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89 |
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90 <p>The Million Instructions Per Second (MIPS) graph gives you a general idea of |
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91 CPU speed in a measured use case. The basic use case for the MIPS analysis |
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92 would be to check any low areas in the graph since they may reveal unoptimized |
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93 features, for example, in terms of memory access (reads and writes). The higher |
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94 the MIPS values, the better and the faster the CPU is in executing |
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95 instructions.</p> |
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96 |
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97 <p>A MIPS (Million Instructions Per Millisecond) graph is displayed in the |
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98 Performance Counters view, when <b>Instructions executed</b> has been selected |
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99 as one of the counters. If <b>Instructions executed</b> has been selected, the |
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100 dialog below is displayed during PIAnalyser file import:</p> |
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101 |
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102 <p align="center"><img src="images/MIPS_speed_dialog.png"></p> |
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103 |
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104 <p class="figure">Figure 1. MIPS Graph Generation</p> |
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105 |
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106 <p>The processor speed information is needed for calculating the data for the |
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107 MIPS graph. The rest of the data for the calculation is included in the |
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108 <b>Instructions executed</b> and <b>CPU cycles</b> counters.</p> |
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109 |
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110 <p>The MIPS counter information is displayed in the graphs view and the legend |
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111 table together with the other performance counters. Note, however, that for |
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112 MIPS only <b>Average (1/ms)</b>, <b>Min (1/ms)</b>, and <b>Max (1/ms)</b> |
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113 information is displayed in the legend table.</p> |
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114 |
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115 <p><br> |
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116 </p> |
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117 |
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118 <p><strong>Related references </strong></p> |
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119 <ul> |
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120 <li><a href="../../reference/analyzer/traceable_events.htm">Traceable Event |
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121 Types</a></li> |
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122 <li><a href="../../reference/profiler/Prof_counter_settings.htm">PIProfiler |
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123 Performance Counter Settings</a></li> |
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124 <li><a href="main_view.htm">Analyzer View</a></li> |
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125 </ul> |
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126 |
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127 <div id="footer"> |
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128 Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies). All rights |
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129 reserved. <br> |
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130 License: <a |
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131 href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a></div> |
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132 </body> |
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133 </html> |