I'm trying to understand if the performance I'm seeing with the event loop is
'normal' or 'abnormal'. I have two embedded devices each running Qt - one is a
i.MX53 and the other is a i.MX6 quadcore with all cores disabled except cpu0.
I've run the events benchmark test on both (from
qtbase/tests/benchmarks/corelib/kernel/events) and these are the results:
i.MX53
---------
********* Start testing of EventsBench *********
Config: Using QtTest library 5.5.0, Qt 5.5.0 (arm-little_endian-ilp32-eabi
shared (dynamic) release build; by GCC 4.8.4)
PASS : EventsBench::initTestCase()
PASS : EventsBench::noEvent()
RESULT : EventsBench::noEvent():
0.000037 msecs per iteration (total: 79, iterations: 2097152)
PASS : EventsBench::sendEvent(no eventfilter)
RESULT : EventsBench::sendEvent():"no eventfilter":
0.00024 msecs per iteration (total: 63, iterations: 262144)
PASS : EventsBench::sendEvent(eventfilter)
RESULT : EventsBench::sendEvent():"eventfilter":
0.00031 msecs per iteration (total: 82, iterations: 262144)
PASS : EventsBench::postEvent(first time, no eventfilter)
RESULT : EventsBench::postEvent():"first time, no eventfilter":
21 msecs per iteration (total: 87, iterations: 4)
PASS : EventsBench::postEvent(no eventfilter)
RESULT : EventsBench::postEvent():"no eventfilter":
20 msecs per iteration (total: 83, iterations: 4)
PASS : EventsBench::postEvent(eventfilter)
RESULT : EventsBench::postEvent():"eventfilter":
20 msecs per iteration (total: 83, iterations: 4)
PASS : EventsBench::cleanupTestCase()
Totals: 8 passed, 0 failed, 0 skipped, 0 blacklisted
********* Finished testing of EventsBench *********
i.MX6
---------
********* Start testing of EventsBench *********
Config: Using QtTest library 5.4.1, Qt 5.4.1 (arm-little_endian-ilp32-eabi
shared (dynamic) release build; by GCC 4.8.4)
PASS : EventsBench::initTestCase()
PASS : EventsBench::noEvent()
RESULT : EventsBench::noEvent():
0.000030 msecs per iteration (total: 63, iterations: 2097152)
PASS : EventsBench::sendEvent(no eventfilter)
RESULT : EventsBench::sendEvent():"no eventfilter":
0.00017 msecs per iteration (total: 93, iterations: 524288)
PASS : EventsBench::sendEvent(eventfilter)
RESULT : EventsBench::sendEvent():"eventfilter":
0.00024 msecs per iteration (total: 63, iterations: 262144)
PASS : EventsBench::postEvent(first time, no eventfilter)
RESULT : EventsBench::postEvent():"first time, no eventfilter":
3.0 msecs per iteration (total: 96, iterations: 32)
PASS : EventsBench::postEvent(no eventfilter)
RESULT : EventsBench::postEvent():"no eventfilter":
3.0 msecs per iteration (total: 97, iterations: 32)
PASS : EventsBench::postEvent(eventfilter)
RESULT : EventsBench::postEvent():"eventfilter":
3.0 msecs per iteration (total: 98, iterations: 32)
PASS : EventsBench::cleanupTestCase()
Totals: 8 passed, 0 failed, 0 skipped, 0 blacklisted
********* Finished testing of EventsBench *********
>From this test it looks like sendEvent is ~1.3 times slower on the i.MX53 and
>postEvent is ~6.5 times slower on the i.MX53.
Is this to be expected or do I have something misconfigured somewhere?
Thanks,
Robert Daniels
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