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>Board: ARM PID Evaluation Board</TITLE
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>Appendix B. Real-time characterization</TD
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NAME="RT-ARM-PID">Board: ARM PID Evaluation Board</H1
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NAME="AEN4508">CPU : ARM 7TDMI 20 MHz</H2
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>Board: ARM PID Evaluation Board
CPU : ARM 7TDMI 20 MHz
Startup, main stack : stack used 404 size 2400
Startup : Interrupt stack used 136 size 4096
Startup : Idlethread stack used 84 size 2048
eCos Kernel Timings
Notes: all times are in microseconds (.000001) unless otherwise stated
Reading the hardware clock takes 6 'ticks' overhead
... this value will be factored out of all other measurements
Clock interrupt took 120.74 microseconds (150 raw clock ticks)
Testing parameters:
Clock samples: 32
Threads: 50
Thread switches: 128
Mutexes: 32
Mailboxes: 32
Semaphores: 32
Scheduler operations: 128
Counters: 32
Alarms: 32
Confidence
Ave Min Max Var Ave Min Function
====== ====== ====== ====== ========== ========
99.01 68.00 129.60 15.62 50% 26% Create thread
21.60 21.60 21.60 0.00 100% 100% Yield thread [all suspended]
15.65 15.20 16.00 0.39 56% 44% Suspend [suspended] thread
15.79 15.20 16.00 0.31 74% 26% Resume thread
23.65 23.20 24.00 0.39 56% 44% Set priority
2.26 1.60 2.40 0.24 82% 18% Get priority
51.39 51.20 52.00 0.29 76% 76% Kill [suspended] thread
21.60 21.60 21.60 0.00 100% 100% Yield [no other] thread
29.47 28.00 29.60 0.22 86% 2% Resume [suspended low prio] thread
15.60 15.20 16.00 0.40 100% 50% Resume [runnable low prio] thread
27.73 24.00 28.00 0.40 74% 2% Suspend [runnable] thread
21.60 21.60 21.60 0.00 100% 100% Yield [only low prio] thread
15.65 15.20 16.00 0.39 56% 44% Suspend [runnable->not runnable]
51.39 51.20 52.00 0.29 76% 76% Kill [runnable] thread
27.66 27.20 28.80 0.41 54% 44% Destroy [dead] thread
68.93 64.80 69.60 0.35 72% 2% Destroy [runnable] thread
91.26 90.40 107.20 0.64 66% 32% Resume [high priority] thread
49.14 48.80 49.60 0.39 57% 57% Thread switch
2.20 1.60 2.40 0.30 75% 25% Scheduler lock
10.20 9.60 10.40 0.30 75% 25% Scheduler unlock [0 threads]
10.20 9.60 10.40 0.30 75% 25% Scheduler unlock [1 suspended]
10.20 9.60 10.40 0.30 75% 25% Scheduler unlock [many suspended]
10.20 9.60 10.40 0.30 75% 25% Scheduler unlock [many low prio]
6.85 6.40 7.20 0.39 56% 43% Init mutex
18.40 18.40 18.40 0.00 100% 100% Lock [unlocked] mutex
19.57 19.20 20.00 0.40 53% 53% Unlock [locked] mutex
16.55 16.00 16.80 0.34 68% 31% Trylock [unlocked] mutex
14.55 14.40 15.20 0.24 81% 81% Trylock [locked] mutex
3.55 3.20 4.00 0.39 56% 56% Destroy mutex
119.85 119.20 120.00 0.24 81% 18% Unlock/Lock mutex
12.85 12.80 13.60 0.09 93% 93% Create mbox
1.65 1.60 2.40 0.09 93% 93% Peek [empty] mbox
20.70 20.00 20.80 0.17 87% 12% Put [first] mbox
1.65 1.60 2.40 0.09 93% 93% Peek [1 msg] mbox
20.70 20.00 20.80 0.17 87% 12% Put [second] mbox
1.65 1.60 2.40 0.09 93% 93% Peek [2 msgs] mbox
20.85 20.80 21.60 0.09 93% 93% Get [first] mbox
20.85 20.80 21.60 0.09 93% 93% Get [second] mbox
19.90 19.20 20.00 0.17 87% 12% Tryput [first] mbox
17.60 17.60 17.60 0.00 100% 100% Peek item [non-empty] mbox
20.90 20.80 21.60 0.17 87% 87% Tryget [non-empty] mbox
16.80 16.80 16.80 0.00 100% 100% Peek item [empty] mbox
17.65 17.60 18.40 0.09 93% 93% Tryget [empty] mbox
1.85 1.60 2.40 0.34 68% 68% Waiting to get mbox
1.85 1.60 2.40 0.34 68% 68% Waiting to put mbox
19.40 19.20 20.00 0.30 75% 75% Delete mbox
65.05 64.80 65.60 0.34 68% 68% Put/Get mbox
7.05 6.40 7.20 0.24 81% 18% Init semaphore
15.55 15.20 16.00 0.39 56% 56% Post [0] semaphore
17.35 16.80 17.60 0.34 68% 31% Wait [1] semaphore
14.60 14.40 15.20 0.30 75% 75% Trywait [0] semaphore
14.20 13.60 14.40 0.30 75% 25% Trywait [1] semaphore
4.55 4.00 4.80 0.34 68% 31% Peek semaphore
3.75 3.20 4.00 0.34 68% 31% Destroy semaphore
70.85 70.40 71.20 0.39 56% 43% Post/Wait semaphore
6.05 5.60 6.40 0.39 56% 43% Create counter
2.25 1.60 2.40 0.24 81% 18% Get counter value
2.25 1.60 2.40 0.24 81% 18% Set counter value
19.70 19.20 20.00 0.37 62% 37% Tick counter
3.45 3.20 4.00 0.34 68% 68% Delete counter
9.05 8.80 9.60 0.34 68% 68% Create alarm
29.60 29.60 29.60 0.00 100% 100% Initialize alarm
2.15 1.60 2.40 0.34 68% 31% Disable alarm
29.35 28.80 29.60 0.34 68% 31% Enable alarm
5.10 4.80 5.60 0.37 62% 62% Delete alarm
23.20 23.20 23.20 0.00 100% 100% Tick counter [1 alarm]
138.00 137.60 138.40 0.40 100% 50% Tick counter [many alarms]
40.40 40.00 40.80 0.40 100% 50% Tick & fire counter [1 alarm]
704.25 697.60 804.00 12.47 93% 93% Tick & fire counters [>1 together]
155.20 155.20 155.20 0.00 100% 100% Tick & fire counters [>1 separately]
105.20 104.80 151.20 0.76 99% 94% Alarm latency [0 threads]
117.57 104.80 149.60 7.13 57% 25% Alarm latency [2 threads]
117.49 104.80 148.80 7.10 58% 26% Alarm latency [many threads]
192.59 177.60 316.00 1.93 98% 0% Alarm -> thread resume latency
22.10 21.60 24.00 0.00 Clock/interrupt latency
38.69 32.80 61.60 0.00 Clock DSR latency
297 276 316 (main stack: 752) Thread stack used (1120 total)
All done, main stack : stack used 752 size 2400
All done : Interrupt stack used 288 size 4096
All done : Idlethread stack used 272 size 2048
Timing complete - 30350 ms total
PASS:<Basic timing OK>
EXIT:<done>
</PRE
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NAME="AEN4511">CPU : ARM 920T 20 MHz</H2
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CLASS="LITERALLAYOUT"
> Board: ARM PID Evaluation Board
CPU : ARM 920T 20 MHz
Startup, main stack : stack used 404 size 2400
Startup : Interrupt stack used 136 size 4096
Startup : Idlethread stack used 84 size 2048
eCos Kernel Timings
Notes: all times are in microseconds (.000001) unless otherwise stated
Reading the hardware clock takes 15 'ticks' overhead
... this value will be factored out of all other measurements
Clock interrupt took 291.41 microseconds (364 raw clock ticks)
Testing parameters:
Clock samples: 32
Threads: 50
Thread switches: 128
Mutexes: 32
Mailboxes: 32
Semaphores: 32
Scheduler operations: 128
Counters: 32
Alarms: 32
Confidence
Ave Min Max Var Ave Min Function
====== ====== ====== ====== ========== ========
257.78 168.00 568.00 48.70 56% 28% Create thread
50.21 49.60 50.40 0.29 76% 24% Yield thread [all suspended]
36.26 36.00 36.80 0.35 68% 68% Suspend [suspended] thread
37.20 36.80 37.60 0.40 100% 50% Resume thread
56.24 56.00 56.80 0.34 70% 70% Set priority
5.20 4.80 5.60 0.40 100% 50% Get priority
122.75 122.40 123.20 0.39 56% 56% Kill [suspended] thread
50.19 49.60 50.40 0.31 74% 26% Yield [no other] thread
69.49 66.40 69.60 0.21 92% 2% Resume [suspended low prio] thread
37.01 36.80 37.60 0.31 74% 74% Resume [runnable low prio] thread
64.75 55.20 65.60 0.38 80% 2% Suspend [runnable] thread
50.19 49.60 50.40 0.31 74% 26% Yield [only low prio] thread
36.24 36.00 36.80 0.34 70% 70% Suspend [runnable->not runnable]
122.75 122.40 123.20 0.39 56% 56% Kill [runnable] thread
67.76 67.20 68.00 0.34 70% 30% Destroy [dead] thread
167.07 158.40 168.00 0.35 92% 2% Destroy [runnable] thread
213.49 212.00 249.60 1.46 84% 90% Resume [high priority] thread
122.81 120.00 389.60 4.17 99% 99% Thread switch
4.70 4.00 4.80 0.17 87% 12% Scheduler lock
23.70 23.20 24.00 0.37 62% 37% Scheduler unlock [0 threads]
23.60 23.20 24.00 0.40 100% 50% Scheduler unlock [1 suspended]
23.70 23.20 24.00 0.37 62% 37% Scheduler unlock [many suspended]
23.60 23.20 24.00 0.40 100% 50% Scheduler unlock [many low prio]
15.65 15.20 16.00 0.39 56% 43% Init mutex
42.40 42.40 42.40 0.00 100% 100% Lock [unlocked] mutex
45.37 44.80 46.40 0.36 65% 31% Unlock [locked] mutex
39.20 39.20 39.20 0.00 100% 100% Trylock [unlocked] mutex
34.45 34.40 35.20 0.09 93% 93% Trylock [locked] mutex
8.00 8.00 8.00 0.00 100% 100% Destroy mutex
284.42 284.00 284.80 0.40 53% 46% Unlock/Lock mutex
29.40 28.80 29.60 0.30 75% 25% Create mbox
3.35 3.20 4.00 0.24 81% 81% Peek [empty] mbox
49.35 48.80 49.60 0.34 68% 31% Put [first] mbox
3.35 3.20 4.00 0.24 81% 81% Peek [1 msg] mbox
49.35 48.80 49.60 0.34 68% 31% Put [second] mbox
3.35 3.20 4.00 0.24 81% 81% Peek [2 msgs] mbox
49.15 48.80 49.60 0.39 56% 56% Get [first] mbox
49.15 48.80 49.60 0.39 56% 56% Get [second] mbox
47.80 47.20 48.00 0.30 75% 25% Tryput [first] mbox
41.40 40.80 41.60 0.30 75% 25% Peek item [non-empty] mbox
49.40 48.80 49.60 0.30 75% 25% Tryget [non-empty] mbox
40.15 40.00 40.80 0.24 81% 81% Peek item [empty] mbox
40.95 40.80 41.60 0.24 81% 81% Tryget [empty] mbox
4.05 4.00 4.80 0.09 93% 93% Waiting to get mbox
4.05 4.00 4.80 0.09 93% 93% Waiting to put mbox
45.60 45.60 45.60 0.00 100% 100% Delete mbox
153.27 152.80 153.60 0.39 59% 40% Put/Get mbox
16.80 16.80 16.80 0.00 100% 100% Init semaphore
36.60 36.00 36.80 0.30 75% 25% Post [0] semaphore
39.60 39.20 40.00 0.40 100% 50% Wait [1] semaphore
34.80 34.40 35.20 0.40 100% 50% Trywait [0] semaphore
33.35 32.80 33.60 0.34 68% 31% Trywait [1] semaphore
10.30 9.60 10.40 0.17 87% 12% Peek semaphore
8.80 8.80 8.80 0.00 100% 100% Destroy semaphore
166.92 166.40 167.20 0.36 65% 34% Post/Wait semaphore
13.60 13.60 13.60 0.00 100% 100% Create counter
4.85 4.80 5.60 0.09 93% 93% Get counter value
4.80 4.80 4.80 0.00 100% 100% Set counter value
45.25 44.80 45.60 0.39 56% 43% Tick counter
7.75 7.20 8.00 0.34 68% 31% Delete counter
20.80 20.80 20.80 0.00 100% 100% Create alarm
69.30 68.80 69.60 0.37 62% 37% Initialize alarm
4.80 4.80 4.80 0.00 100% 100% Disable alarm
67.35 67.20 68.00 0.24 81% 81% Enable alarm
11.80 11.20 12.00 0.30 75% 25% Delete alarm
54.80 54.40 55.20 0.40 100% 50% Tick counter [1 alarm]
372.35 363.20 652.80 17.53 96% 96% Tick counter [many alarms]
95.50 95.20 96.00 0.37 62% 62% Tick & fire counter [1 alarm]
1757.92 1707.20 1996.80 81.43 81% 81% Tick & fire counters [>1 together]
404.37 404.00 404.80 0.40 53% 53% Tick & fire counters [>1 separately]
256.57 254.40 395.20 2.17 98% 97% Alarm latency [0 threads]
296.60 255.20 359.20 23.53 53% 31% Alarm latency [2 threads]
307.49 265.60 357.60 27.52 53% 53% Alarm latency [many threads]
467.04 432.00 788.80 5.03 97% 1% Alarm -> thread resume latency
55.63 54.40 60.80 0.00 Clock/interrupt latency
101.23 80.80 1433.60 0.00 Clock DSR latency
316 316 316 (main stack: 752) Thread stack used (1120 total)
All done, main stack : stack used 752 size 2400
All done : Interrupt stack used 288 size 4096
All done : Idlethread stack used 272 size 2048
Timing complete - 30780 ms total
PASS:<Basic timing OK>
EXIT:<done>
</PRE
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