OpenCL causes CL_INVALID_COMMAND_QUEUE if loaded from binary

Question

I'm struggling saving/loading binary-kernels: If i build from source, the program runs fine. But if i write and load the kernel to binary. I get CL_INVALID_COMMAND_QUEUE calling m_prog.getCommandQueues()[iDevice].enqueueNDRangeKernel. My Platform is in both cases (from binary, from source) Intel and my device is in both cases my CPU.

Maybe helpful additional information:

No exceptions are thrown before CL_INVALID_COMMAND_QUEUE ( with __CL_ENABLE_EXCEPTIONS defined)
program ref count 1
program num devs 1
program num devs 1
program build status for device CL_BUILD_SUCCES
program build log
- Device build started
- Device build done
- Reload Program Binary Object.

.

/// write binaries to file
std::ofstream bfile(filenameGenerator(m_platform, fileName), std::ios::binary);
if (!bfile) return IT_CL_FILE_NOT_FOUND;

std::vector<size_t> sizes = m_prog.getInfo<CL_PROGRAM_BINARY_SIZES>();
std::vector<char*>  binaries = m_prog.getInfo<CL_PROGRAM_BINARIES>();

bfile.write((char*)&sizes[0], sizeof(size_t));
bfile.write(binaries[0], sizes[0]);
delete[] binaries[0];

/// ... somewhere else ...

///read binaries from file
ifstream bfile(filenameGenerator(platform, fileName), std::ios::binary);
size_t n;
std::vector<char> buf;

bfile.read((char*)&n, sizeof(size_t));
buf.resize(n);
bfile.read(buf.data(), n);

m_prog = cl::Program(context, devs, cl::Program::Binaries(
    1, std::make_pair(static_cast<const void*>(buf.data()), n)));
m_prog.build(devs);

/// later ...
m_prog.getCommandQueues()[iDevice].enqueueNDRangeKernel ///throws

EDIT: added the last two lines of code, to clearify the calling order

user703016 · Accepted Answer · 2015-05-27 15:44:30Z

1

A program should only have an associated command queue when it has been built for a specific device.

A program loaded from a binary data has not been built, and it is unclear if it has a command queue.

Calling m_prog.getCommandQueues()[device] is not recommended, since you cannot be sure a queue will be returned. You should create your own queue outside, and queue the program there.

edited May 27, 2015 at 15:44

user703016

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answered May 27, 2015 at 13:50

DarkZeros

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3 Comments

user1235183 Over a year ago

but i called m_prog.build(devs) first(see Edit), why shouldnt be there no command queues (i'm openCL novice). It would be kind to show some source code to explain what i've to do.

DarkZeros Over a year ago

"Build" didn't build anything, since you loaded the binaries already. That is the only explanation I have for the behavior you are experiencing vs the normal code build approach.

user1235183 Over a year ago

Thank you your answer gave me a deeper insight.

user1235183 · Accepted Answer · 2015-05-28 08:55:27Z

0

I found the solution myself, i was able to succed in not initializing the vector<cl::CommandQueue> and only resizes the vector.

answered May 28, 2015 at 8:55

user1235183

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