AM5728: OpenCV OpenCL offload

yu chen

Part Number: AM5728
Other Parts Discussed in Thread: SYSBIOS

I am using ti-processor-sdk-linux-am57xx-evm-04.03.00.05,which include opencl-1.1.14.10-r0.0 and opencv/3.1+gitAUTOINC+9b88e8c746-r3

I have read the TI OpenCV wiki, and I get the similar data:

when opencl off, for 1080P JPEG picture, Canny cost 145ms; when opencl on, Canny cost 17ms.

When I process two same pictures consecutively in the same program, the timing becomes strange

opencl on: Fisrt process: 11ms, Second process: 0.58ms; I try more image process, others always 0.5+ms

Q1：Why is there such a strange phenomenon?

I use OE to create a filesytem, which include dra7-dsp1-fw.xe66.opencl-monitor and dra7-dsp2-fw.xe66.opencl-monitor, which is work fine at openc on status.The above data is based on these two firmware tests

When I use the file system that comes with the SDK package, which dsp monitor firmware is work fine at opencl off, but opencl on, dsp will crash.

root@am57xx-evm:~# cat /sys/kernel/debug/remoteproc/remoteproc2/trace0

[ 0.000] 20 Resource entries at 0xfec00000

[ 0.000] registering rpmsg-proto:rpmsg-proto service on 61 with HOST

[ 74.241] A0=0x1 A1=0xfecc78f4

[ 74.241] A2=0x0 A3=0x437f0000

[ 74.241] A4=0x0 A5=0x0

[ 74.241] A6=0x0 A7=0x0

[ 74.241] A8=0x0 A9=0xa2fe4b88

[ 74.241] A10=0x1d31bdc0 A11=0x80dbde00

[ 74.241] A12=0x808000 A13=0x808124

[ 74.241] A14=0x88 A15=0x0

[ 74.241] A16=0x77f A17=0x5fc90c0e

[ 74.241] A18=0x5fc9100d A19=0x5fc90ffe

[ 74.241] A20=0x780 A21=0x440

[ 74.241] A22=0x1800144 A23=0x1800140

[ 74.241] A24=0x180010c A25=0x20

[ 74.241] A26=0xfef26060 A27=0x0

[ 74.241] A28=0x88 A29=0x90

[ 74.241] A30=0x0 A31=0x808120

[ 74.241] B0=0x0 B1=0x1

[ 74.241] B2=0xfffffff9 B3=0x808090

[ 74.241] B4=0x0 B5=0x437f0000

[ 74.241] B6=0x437f0000 B7=0x1d31bdc0

[ 74.241] B8=0x1ee95f80 B9=0xffffffff

[ 74.241] B10=0x90 B11=0x0

[ 74.241] B12=0x808128 B13=0xa25f0000

[ 74.241] B14=0x0 B15=0x802668

[ 74.241] B16=0x805d36 B17=0x77f

[ 74.241] B18=0x437 B19=0x400

[ 74.241] B20=0x5fc90ffe B21=0xff

[ 74.241] B22=0x5fc9100d B23=0x0

[ 74.241] B24=0x1fa3ff B25=0x20

[ 74.241] B26=0x400 B27=0x50f

[ 74.241] B28=0x400 B29=0x50f

[ 74.241] B30=0x510 B31=0xfedfcb60

[ 74.241] NTSR=0x1000f

[ 74.241] ITSR=0xd

[ 74.241] IRP=0xfec21090

[ 74.241] SSR=0x0

[ 74.241] AMR=0x0

[ 74.241] RILC=0x800080

[ 74.241] ILC=0x0

[ 74.241] Exception at 0x809440

[ 74.241] EFR=0x2 NRP=0x809440

[ 74.241] Internal exception: IERR=0x2

[ 74.241] Fetch packet exception

[ 74.241] [t=0x0007da0b] ti.sysbios.family.c64p.Exception: ERROR: line 256: E_exceptionMax: pc = 0x00809440, sp = 0x00802668.

[ 74.241] ti.sysbios.family.c64p.Exception: line 256: E_exceptionMax: pc = 0 x00809440, sp = 0x00802668.

[ 74.241] xdc.runtime.Error.raise: terminating execution

root@am57xx-evm:~#

Q2: Why the SDK dsp monitor firmware will crash when opencl on? Can you recurrent it?

If you have any idea, please let me know.

Thanks.

over 5 years ago

0 Ramprasad over 5 years ago

TI__Mastermind 30480 points

Please refer this link

https://processors.wiki.ti.com/index.php/OpenCV

0 yu chen over 5 years ago in reply to Ramprasad

Expert 1465 points

Hi, Ramprasad

Thanks for your reply.

I have read this link, I did not find a description related to the phenomenon I described. Can you indicate which chapter?

0 Dave Bell over 5 years ago in reply to yu chen

TI__Genius 14680 points

CY,

For Q1: There might be two issues involved here:

- Extra kernel source compilation time for first frame

- Extra kernel program load time for first frame

Please have a further look to http://software-dl.ti.com/processor-sdk-linux/esd/docs/latest/linux/Foundational_Components_OpenCV.html for additional details

For Q2: Please do confirm that the default SDK works fine, which seems to be the case, given your data from Q1. If you are trying to rebuild the SDK with yocto, please be sure to also rebuild OpenCV or any other package that could use OpenCL as well. The crash could be caused by a mismatch between stale, pre-compiled OpenCL kernels and newly-built OpenCL DSP monitor.

Best regards,

Dave

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AM5728: OpenCV OpenCL offload