ReadMeFeed / Community knowledge
Real questions. Useful conversations. Find the people who know your stack.
Frameworks & web · #opencl
Learn how to allocate OpenCL local memory with a NULL pointer, synchronize work‑items using barriers, and apply the pattern to a tiled reduction kernel.
OpenCL 3.0 redefined the specification as a lean core aligned with OpenCL 1.2, making every post-1.2 capability optional and queryable per device. A host program can no longer treat a device that reports OpenCL 3.0 as guaranteed to provide behavior that was core in OpenCL 2.x. The goal is a portable selection policy for a host application that enumerates pla
Learn how to use OpenCL 2.0 Shared Virtual Memory to let host and device share a pointer, eliminating explicit copy commands, with a working coarse‑grained example, limits, and verification steps.
I am building a pipeline where OpenGL renders into a shared texture and an OpenCL kernel post-processes it each frame, using cl_khr_gl_sharing with objects created via clCreateFromGLTexture. The context is created with the platform-specific GL context properties, and the device reports the sharing extension. The specification describes an explicit ownership
Designing error handling for a small OpenCL application that uses a single in-order Command Queue for kernel execution. The goal is to decide when CL_OUT_OF_RESOURCES should trigger a retry with reduced work-group size versus a hard failure. Constraints include vendor-dependent ICD behavior, the distinction between global memory allocation failure, register
A design goal is to define portable limits for zero-copy host-device buffer sharing across OpenCL 3.0 implementations without assuming optional features. Device limits for allocation size and base address alignment are device-specific and must be queried at runtime. CL_MEM_USE_HOST_PTR and CL_MEM_ALLOC_HOST_PTR have implementation-defined requirements for po
When utilizing multiple OpenCL command queues configured with CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE, a measurable latency gap often emerges between clEnqueueNDRangeKernel and the CL_PROFILING_COMMAND_START timestamp. This delay appears to manifest specifically when multiple queues submit kernels simultaneously, whereas single-queue operations maintain consi
OpenCL Build Log Size Limit in clGetProgramBuildInfo When a kernel compilation fails, developers rely on the build log returned by clGetProgramBuildInfo with the CL_PROGRAM_BUILD_LOG flag to diagnose the issue. The OpenCL specification mandates that this call return the entire log, yet it does not prescribe a maximum size. In practice, many vendor drivers im
Scenario A host application uses a single OpenCL context with an out-of-order command queue. Multiple host threads call clEnqueueNDRangeKernel concurrently, each with its own event, and later wait via clWaitForEvents. Under single-threaded submission the enqueue-to-completion interval is stable, but the design goal is to keep per-command latency predictable