Intel® Inspector User Guide for Linux* OS

ID 767796
Date 7/13/2023
Document Table of Contents
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Mismatched Queue

Occurs when a pointer allocated for a certain queue is used for a different queue.


Code Location



Allocation site

Represents source location of memory allocation in a Data Parallel C++ (DPC++) code.

DPC++ programs use queues for planning tasks for kernels. Each pointer is allocated for a certain device and is associated with a certain queue. Using a pointer allocated for one queue with another queue results in an error.

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.memcpy(deviceData, hostData, sizeInBytes).wait(); 

// it should be queue_1.memcpy(deviceData, hostData, sizeInBytes).wait(); 

Possible Correction Strategies

Consider reducing the amount of queues or using one queue if possible.

If you are using multiple queues, consider using shared memory pointers.