Hi All,
I've taken some time to freshen up the libjpeg-turbo hosted at
lp:libjpeg-turbo to be refreshed with the upstream 1.1.1 plus Mandeeps
previous work. I thought as part of this effort I'd do some
performance comparisons between this new cut of code and the much
older non arm optimized libjpeg62.
For this test, I selected 3 ppms and 3 jpegs of the same image. The
images are all color and are of the sizes : 1920x1024, 406x357 and
7227x3847. I placed the images inside of a ramdisk as well as would
run the cjpeg and djpeg applications with time. Both cjpeg and djpeg
and statically linked. I believe the libjpeg62 and libjpeg-turbo code
using the current 4.5.2 version of gcc using the 0706 panda hwpack and
LEB.
Note, while these numbers are interesting to a point, time is I
believe the wrong tool to make this measurement. Instead the call to
the jpeg code should have time stamps before and after the operation
to get a better idea of the time used.
Numbers:
cjpeg (ppm to jpeg conversion default parms)
image size libjpeg62 libjpeg-turbo
improvement (positive numbers are better)
1920x1024 real 0m0.522s real 0m0.452s +0.070s
user 0m0.438s user 0m0.352s
+0.086s
sys 0m0.055s sys 0m0.070s
-0.015s
406x357 real 0m0.086s real 0m0.085s +0.001s
user 0m0.047s user 0m0.047s
0s
sys 0m0.008s sys 0m0.008s
0s
7227x3847 real 0m3.812s real 0m4.075s - 0.263s
user 0m3.461s user 0m3.711s
- 0.250s
sys 0m0.305s sys 0m0.328s
- 0.023s
djpeg (jpeg to ppm conversion default parms)
image size libjpeg62 libjpeg-turbo
improvement
1920x1024 real 0m0.414s real 0m0.294s +0.120s
user 0m0.273s user 0m0.156s
+0.117s
sys 0m0.109s sys 0m0.109s 0s
406x357 real 0m0.079s real 0m0.072s +0.007s
user 0m0.023s user 0m0.016s
+0.007s
sys 0m0.023s sys 0m0.023s 0s
7227x3847 real 0m7.517s real 0m10.099s -2.582s
user 0m2.047s user 0m1.242s +0.805s
sys 0m0.813s sys 0m0.859s -0.046s
Further work:
There are some additional patches from Michael Edwards, those were not
part of this measurement tho I will be picking his patches up.
Better timestamp code instead of using time.
--
Regards,
Tom
"We want great men who, when fortune frowns will not be discouraged."
- Colonel Henry Knox
Linaro.org │ Open source software for ARM SoCs
w) tom.gall att linaro.org
w) tom_gall att vnet.ibm.com
h) tom_gall att mac.com
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