Pointer from Different Device
Occurs when memory is allocated on a device using a pointer from another device.
ID
| Code Location
| Description
|
|---|---|---|
1
| Allocation site
| Represents source location of memory allocation on device. If a pointer allocated for a certain device is used for memory allocation on a different device, the pointer is considered invalid.
|
DPC++ Example
cl::sycl::queue queue_1(cl::sycl::cpu_selector{}); cl::sycl::queue queue_2(cl::sycl::cpu_selector{}); int* deviceData = (int*)sycl::malloc_device(sizeInBytes, queue_1.get_device(), queue_1.get_context()); queue_2.submit([&](cl::sycl::handler &cgh) { cgh.parallel_for<class kernel1>(range, [=](cl::sycl::item<1> itemID) { size_t i = itemID.get_id(0); deviceData[i] = i + 1; }); }
Possible Correction Strategies
To avoid the problem, use the following hints:
- Check if the pointer you are using matches the device it was allocated for.
- Consider converting device pointers into shared memory pointers applicable to multiple device types.