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Welcome to Fractal Forums > Fractal Software > 3D Fractal Generation > Mandelbulber > Bug Reporting > Mandelbulber OpenCL 1.21-1 error
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Author Topic: Mandelbulber OpenCL 1.21-1 error  (Read 550 times)
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the5thfool
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the5thfool
« on: July 19, 2014, 03:47:12 PM »
Windows 7 Professional SP1
Intel i7-4770k
AMD R9 280x

I was animating IFS parameters.  Mandelbulber was able to render 2251 frames last night using OpenCL (FULL) without issue, but throws the following error for frame 2252.

ERROR: ComamndQueue::nqueueNDRangeKernel(jobSize), jobSize = 8192 (-4)

I thought it was the frame, it seemed to start working again if I advance past key 23 and start the animation at 2352 (100 frames/key).  Unfortunately about 3 frames in, it died with the same message.

It seems more related to me trying to interact with Mandelbulber while it is blocking waiting for the video card to return a frame in progress, but I didn't have this much of an issue last night.  Any ideas/workarounds?
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the5thfool
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the5thfool
« Reply #1 on: July 19, 2014, 09:19:32 PM »
Additional info:

I've narrowed down the error to line 635 of cl_support.cpp, due to the typo and inclusion of stepSize.

Code:
err = queue->enqueueNDRangeKernel(*kernel, cl::NullRange, cl::NDRange(stepSize), cl::NDRange(workGroupSize));
                                sprintf(errorText, "ComamndQueue::nqueueNDRangeKernel(jobSize), jobSize = %d", stepSize);
                                if (!checkErr(err, errorText)) return;

Easy to find, but I'm not sure why yet.
« Last Edit: July 19, 2014, 09:21:23 PM by the5thfool » Logged
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Buddhi
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« Reply #2 on: July 19, 2014, 09:51:35 PM »
Send me settings file for this keyframe. I will try look what could be wrong.
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the5thfool
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FSM is fractal


the5thfool
« Reply #3 on: July 20, 2014, 01:14:56 AM »
Sent from my Gmail, let me know if you need anything else.
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the5thfool
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the5thfool
« Reply #4 on: July 20, 2014, 06:45:17 AM »
I'm not sure it's that frame now; MB seems to have gotten past it whatever hiccup it was experiencing.  Maybe it was just some contention over the GPU?
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Buddhi
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« Reply #5 on: July 20, 2014, 08:27:24 AM »
Have you tried to reduce "max GPU mem to use" parameter (on OpenCL tab)? On this keyframe Mandelbulber tries to allocate bigger buffer and OpenCL error -4 is CL_MEM_OBJECT_ALLOCATION_FAILURE
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the5thfool
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the5thfool
« Reply #6 on: July 20, 2014, 04:39:10 PM »
Reduce?  Interesting, I had been increasing it thinking that the memory was pre-allocated.  The card has 3 Gb of memory, I didn't think there would be much difference changing max memory from 256 to 512 Mb.  Thank you for your help!
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Buddhi
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« Reply #7 on: July 20, 2014, 08:04:33 PM »
Memory is allocated dynamically. If rendering is faster then it uses bigger memory buffer to have enough big jobs to utilize desired time defined by processing cycle time.
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fractal animations: http://www.youtube.com/user/xlace
Mandelbulber program: https://github.com/buddhi1980/mandelbulber2
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