struct as kernel argument - invalid memory object error

[Samir Kharchi]

Hi,

I have a struct I get an "invalid memory object" (-38) error code when I try to set a device vector containing this struct type as kernel argument.

//test.h
struct myTestStruct
{
    float dhv;
    float dinvv;      
};

//in global scope
BOOST_COMPUTE_ADAPT_STRUCT(myTestStruct,myTestStruct,(dhv,dinvv))



//other.cpp
//kernel
const char kernel_cl[] = BOOST_COMPUTE_STRINGIZE_SOURCE(__kernel void test(const __global myTestStruct* input){});

//host code
compute::vector<myTestStruct> arr(1);
compute::type_definition<myTestStruct>() + "\n" + kernel_cl;
//then I am building the program and create a corresponding kernel
{...}
kernel.set_arg(0,arr); //ERRORCODE: -38; invalid memory object

Am I doing anything wrong?

Strangely though, I have another struct that I am adapting in the same way and am passing as a kernel argument inside a vector as well, and for that one I don't get any error. That struct contains float and int members only (about 20).
That vector also contains a lot more entries than just 1 but otherwise I am using the exact same procedure.

I am not sure why it works for one struct but not the other.

Btw. this is the cl program code built (grabbed via debugging) and passed as kernel constructor argument:

typedef struct __attribute__((packed)) {
    float dhv;
    float dinvv;
} myTestStruct;

__kernel void test(const __global myTestStruct* input) { }

Looks fine to me. Any ideas? :-/

Thanks
P.S.: I tried to use boost::compute::float_ as member types too (and some other vector datatypes like boost::compute::float2_) but with the same outcome.

[Jakub Szuppe]

Hi,

Try: 

kernel.set_arg(0,arr.get_buffer()); 

Kind regards,

Jakub

[Jakub Szuppe]

And you can also check out "Kernel example" (starting at slide 12) from 

http://www.iwocl.org/wp-content/uploads/iwocl-2016-boost-compute.pdf

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[Samir Kharchi]

Sorry, but this also doesn't work for me. :-/ Still am getting the same error message.

[Samir Kharchi]

Thanks. I am already exactly doing it as in that kernel example (except for kernel arguments passing, which I do one by one).

[Jakub Szuppe]

We will figure this out :) I'm writing a test now for that.

[Samir Kharchi]

Jakub. Thanks for all your effort!
But I think there already is a test (https://github.com/boostorg/compute/blob/38ba1c54479869c6ad6d2ea1f828e6d113bc5ab9/test/test_struct.cpp) and in the end it was my fault (again!! argh...).
I forgot to construct the compute vector with the correct context! With that the argument goes through smoothly.

So sorry for the false alarm. I still gotta get used to having these extra data passed into a vector.^^

Anyway, thanks! Your responses made me realise I made that mistake again. :)

[Jakub Szuppe]

Well, I was just writing to you that I wrote a test and it works for me and you should search some error somewhere

else in your code :) Glad, I could help.