<!-- {{{ Banner                         --><!-- =============================================================== --><!--                                                                 --><!--     config-tool.sgml                                            --><!--                                                                 --><!--     eCos User Guide                                             --><!--                                                                 --><!-- =============================================================== --><!-- ####COPYRIGHTBEGIN####                                          --><!--                                                                 --><!-- =============================================================== --><!-- Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.  --><!-- This material may be distributed only subject to the terms      --><!-- and conditions set forth in the Open Publication License, v1.0  --><!-- or later (the latest version is presently available at          --><!-- http://www.opencontent.org/openpub/)                            --><!-- Distribution of the work or derivative of the work in any       --><!-- standard (paper) book form is prohibited unless prior           --><!-- permission obtained from the copyright holder                   --><!-- =============================================================== --><!--                                                                 -->      <!-- ####COPYRIGHTEND####                                            --><!-- =============================================================== --><!-- #####DESCRIPTIONBEGIN####                                       --><!--                                                                 --><!-- ####DESCRIPTIONEND####                                          --><!-- =============================================================== --><!-- }}} --><APPENDIX ID="REAL-TIME-CHARACTERIZATION"><TITLE>Real-time characterization</TITLE><PARA>For a discussion of real-time performance measurement for eCos, see thekernel documentation in the eCos Reference Manual.</PARA><caution><para>As with the target setup descriptions in the previous appendix, thisinformation will eventually be merged into per-target documents.</para></caution><PARA>	Sample numbers:      </PARA><!-- ==================================================== --><SECT1 id="rt-arm-aeb1"><TITLE>Board: ARM AEB-1 Revision B Evaluation Board</TITLE><LITERALLAYOUT CLASS="MONOSPACED">Board: ARM AEB-1 Revision B Evaluation BoardCPU : Sharp LH77790A 24MHzStartup, main stack             : stack used   404 size  2400Startup              :  Interrupt stack used   128 size  2048Startup              : Idlethread stack used    80 size  2048eCos Kernel TimingsNotes: all times are in microseconds (.000001) unless otherwise statedReading the hardware clock takes 13 'ticks' overhead... this value will be factored out of all other measurementsClock interrupt took  193.49 microseconds (290 raw clock ticks)Testing parameters:   Clock samples:            32   Threads:                   7   Thread switches:         128   Mutexes:                  32   Mailboxes:                32   Semaphores:               32   Scheduler operations:    128   Counters:                 32   Alarms:                   32                                 Confidence     Ave     Min     Max     Var  Ave  Min  Function  ======  ======  ======  ====== ========== ========  110.19  104.67  116.00    3.26   42%  28% Create thread   34.00   34.00   34.00    0.00  100% 100% Yield thread [all suspended]   24.67   24.67   24.67    0.00  100% 100% Suspend [suspended] thread   25.05   24.67   25.33    0.33   57%  42% Resume thread   37.14   36.67   37.33    0.27   71%  28% Set priority    3.81    3.33    4.00    0.27   71%  28% Get priority   80.00   80.00   80.00    0.00  100% 100% Kill [suspended] thread   33.90   33.33   34.00    0.16   85%  14% Yield [no other] thread   45.90   44.00   46.67    0.54   57%  14% Resume [suspended low prio] thread   24.57   24.00   24.67    0.16   85%  14% Resume [runnable low prio] thread   42.29   36.67   43.33    1.61   85%  14% Suspend [runnable] thread   33.90   33.33   34.00    0.16   85%  14% Yield [only low prio] thread   24.67   24.67   24.67    0.00  100% 100% Suspend [runnable-&#62;not runnable]   80.00   80.00   80.00    0.00  100% 100% Kill [runnable] thread   43.33   43.33   43.33    0.00  100% 100% Destroy [dead] thread  106.29  101.33  107.33    1.41   85%  14% Destroy [runnable] thread  144.95  141.33  166.00    6.01   85%  85% Resume [high priority] thread   78.31   76.67  254.67    2.75   99%  99% Thread switch    4.00    4.00    4.00    0.00  100% 100% Scheduler lock   16.37   16.00   16.67    0.33   56%  43% Scheduler unlock [0 threads]   16.37   16.00   16.67    0.33   56%  43% Scheduler unlock [1 suspended]   16.37   16.00   16.67    0.33   56%  43% Scheduler unlock [many suspended]   16.37   16.00   16.67    0.33   56%  43% Scheduler unlock [many low prio]   10.67   10.67   10.67    0.00  100% 100% Init mutex   28.67   28.67   28.67    0.00  100% 100% Lock [unlocked] mutex   30.44   30.00   31.33    0.33   59%  37% Unlock [locked] mutex   25.42   25.33   26.00    0.15   87%  87% Trylock [unlocked] mutex   22.50   22.00   22.67    0.25   75%  25% Trylock [locked] mutex    5.75    5.33    6.00    0.31   62%  37% Destroy mutex  185.33  185.33  185.33    0.00  100% 100% Unlock/Lock mutex   20.17   20.00   20.67    0.25   75%  75% Create mbox    2.92    2.67    3.33    0.31   62%  62% Peek [empty] mbox   32.42   32.00   32.67    0.31   62%  37% Put [first] mbox    3.00    2.67    3.33    0.33  100%  50% Peek [1 msg] mbox   32.50   32.00   32.67    0.25   75%  25% Put [second] mbox    2.92    2.67    3.33    0.31   62%  62% Peek [2 msgs] mbox   32.83   32.67   33.33    0.25   75%  75% Get [first] mbox   32.67   32.67   32.67    0.00  100% 100% Get [second] mbox   31.33   31.33   31.33    0.00  100% 100% Tryput [first] mbox   27.58   27.33   28.00    0.31   62%  62% Peek item [non-empty] mbox   32.83   32.67   33.33    0.25   75%  75% Tryget [non-empty] mbox   26.50   26.00   26.67    0.25   75%  25% Peek item [empty] mbox   28.00   28.00   28.00    0.00  100% 100% Tryget [empty] mbox    3.25    2.67    3.33    0.15   87%  12% Waiting to get mbox    3.25    2.67    3.33    0.15   87%  12% Waiting to put mbox   30.83   30.67   31.33    0.25   75%  75% Delete mbox  101.08  100.67  101.33    0.31   62%  37% Put/Get mbox   11.17   10.67   11.33    0.25   75%  25% Init semaphore   24.17   24.00   24.67    0.25   75%  75% Post [0] semaphore   27.08   26.67   27.33    0.31   62%  37% Wait [1] semaphore   22.75   22.67   23.33    0.15   87%  87% Trywait [0] semaphore   22.21   22.00   22.67    0.29   68%  68% Trywait [1] semaphore    7.33    7.33    7.33    0.00  100% 100% Peek semaphore    5.92    5.33    6.00    0.15   87%  12% Destroy semaphore  110.04  110.00  110.67    0.08   93%  93% Post/Wait semaphore    9.54    9.33   10.00    0.29   68%  68% Create counter    3.92    3.33    4.00    0.15   87%  12% Get counter value    4.00    4.00    4.00    0.00  100% 100% Set counter value   30.92   30.67   31.33    0.31   62%  62% Tick counter    5.75    5.33    6.00    0.31   62%  37% Delete counter   13.83   13.33   14.00    0.25   75%  25% Create alarm   46.67   46.67   46.67    0.00  100% 100% Initialize alarm    3.67    3.33    4.00    0.33  100%  50% Disable alarm   45.67   45.33   46.00    0.33  100%  50% Enable alarm    8.33    8.00    8.67    0.33  100%  50% Delete alarm   36.33   36.00   36.67    0.33  100%  50% Tick counter [1 alarm]  214.67  214.67  214.67    0.00  100% 100% Tick counter [many alarms]   62.67   62.67   62.67    0.00  100% 100% Tick &#38; fire counter [1 alarm] 1087.04 1075.33 1278.67   21.91   93%  93% Tick &#38; fire counters [&#62;1 together]  246.35  240.67  412.00   10.35   96%  96% Tick &#38; fire counters [&#62;1 separately]  168.01  167.33  237.33    1.08   99%  99% Alarm latency [0 threads]  187.36  168.00  234.67    3.60   86%   1% Alarm latency [2 threads]  187.37  167.33  235.33    3.59   85%   1% Alarm latency [many threads]  303.12  280.00  508.67    3.21   98%   0% Alarm -&#62; thread resume latency   36.65   36.00   38.67    0.00            Clock/interrupt latency   65.79   52.00  152.67    0.00            Clock DSR latency  316     316     316  (main stack:   752)  Thread stack used (1120 total)All done, main stack            : stack used   752 size  2400All done             :  Interrupt stack used   280 size  2048All done             : Idlethread stack used   268 size  2048Timing complete - 30390 ms totalPASS:&lt;Basic timing OK&#62;EXIT:&lt;done&#62;	</LITERALLAYOUT></SECT1><!-- ==================================================== --><SECT1 id="rt-at91-eb40"><TITLE>Board: Atmel AT91/EB40</TITLE><LITERALLAYOUT CLASS="MONOSPACED">Board: Atmel AT91/EB40CPU : AT91R40807 (ARM7TDMI core), 32MHz512KB RAM, 64K FlashStartup, main stack             : stack used   420 size  2400Startup              :  Interrupt stack used   144 size  4096Startup              : Idlethread stack used    84 size  2048eCos Kernel TimingsNotes: all times are in microseconds (.000001) unless otherwise statedReading the hardware clock takes 3 'ticks' overhead... this value will be factored out of all other measurementsClock interrupt took  127.53 microseconds (130 raw clock ticks)Testing parameters:   Clock samples:            32   Threads:                  25   Thread switches:         128   Mutexes:                  32   Mailboxes:                32   Semaphores:               32   Scheduler operations:    128   Counters:                 32   Alarms:                   32                                 Confidence     Ave     Min     Max     Var  Ave  Min  Function  ======  ======  ======  ====== ========== ========   86.48   71.29  101.56    7.99   48%  28% Create thread   20.70   20.51   21.48    0.31   80%  80% Yield thread [all suspended]   17.15   16.60   17.58    0.48   56%  44% Suspend [suspended] thread   17.07   16.60   17.58    0.49   52%  52% Resume thread   25.51   25.39   26.37    0.21   88%  88% Set priority    3.16    2.93    3.91    0.36   76%  76% Get priority   52.34   51.76   52.73    0.47   60%  40% Kill [suspended] thread   20.70   20.51   21.48    0.31   80%  80% Yield [no other] thread   28.98   28.32   30.27    0.48   60%  36% Resume [suspended low prio] thread   17.11   16.60   17.58    0.49   52%  48% Resume [runnable low prio] thread   27.85   26.37   28.32    0.52   96%   4% Suspend [runnable] thread   20.70   20.51   21.48    0.31   80%  80% Yield [only low prio] thread   17.23   16.60   17.58    0.45   64%  36% Suspend [runnable-&#62;not runnable]   52.34   51.76   52.73    0.47   60%  40% Kill [runnable] thread   33.01   32.23   33.20    0.31   80%  20% Destroy [dead] thread   72.03   70.31   72.27    0.38   80%   4% Destroy [runnable] thread   96.99   95.70  112.30    1.22   64%  96% Resume [high priority] thread   51.48   49.80  164.06    1.76   99%  99% Thread switch    2.78    1.95    2.93    0.26   84%  15% Scheduler lock   11.81   11.72   12.70    0.17   90%  90% Scheduler unlock [0 threads]   11.81   11.72   12.70    0.17   90%  90% Scheduler unlock [1 suspended]   11.81   11.72   12.70    0.17   90%  90% Scheduler unlock [many suspended]   11.81   11.72   12.70    0.17   90%  90% Scheduler unlock [many low prio]    5.49    4.88    5.86    0.46   62%  37% Init mutex   20.20   19.53   20.51    0.42   68%  31% Lock [unlocked] mutex   24.44   24.41   25.39    0.06   96%  96% Unlock [locked] mutex   18.25   17.58   18.55    0.42   68%  31% Trylock [unlocked] mutex   16.11   15.63   16.60    0.49  100%  50% Trylock [locked] mutex    6.10    5.86    6.84    0.37   75%  75% Destroy mutex  124.21  124.02  125.00    0.30   81%  81% Unlock/Lock mutex    9.28    8.79    9.77    0.49  100%  50% Create mbox    2.93    2.93    2.93    0.00  100% 100% Peek [empty] mbox   22.58   22.46   23.44    0.21   87%  87% Put [first] mbox    2.44    1.95    2.93    0.49  100%  50% Peek [1 msg] mbox   22.58   22.46   23.44    0.21   87%  87% Put [second] mbox    2.44    1.95    2.93    0.49  100%  50% Peek [2 msgs] mbox   22.71   22.46   23.44    0.37   75%  75% Get [first] mbox   22.71   22.46   23.44    0.37   75%  75% Get [second] mbox   21.18   20.51   21.48    0.42   68%  31% Tryput [first] mbox   18.98   18.55   19.53    0.48   56%  56% Peek item [non-empty] mbox   22.46   22.46   22.46    0.00  100% 100% Tryget [non-empty] mbox   18.31   17.58   18.55    0.37   75%  25% Peek item [empty] mbox   19.53   19.53   19.53    0.00  100% 100% Tryget [empty] mbox    2.69    1.95    2.93    0.37   75%  25% Waiting to get mbox    2.93    2.93    2.93    0.00  100% 100% Waiting to put mbox   23.86   23.44   24.41    0.48   56%  56% Delete mbox