Discussion of article "Understand and efficiently use OpenCL API by recreating built-in support as DLL on Linux (Part 1): Motivation and validation"
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New article Understand and efficiently use OpenCL API by recreating built-in support as DLL on Linux (Part 1): Motivation and validation has been published:
Bulit-in OpenCL support in MetaTrader 5 still has a major problem especially the one about device selection error 5114 resulting from unable to create an OpenCL context using CL_USE_GPU_ONLY, or CL_USE_GPU_DOUBLE_ONLY although it properly detects GPU. It works fine with directly using of ordinal number of GPU device we found in Journal tab, but that's still considered a bug, and users should not hard-code a device. We will solve it by recreating an OpenCL support as DLL with C++ on Linux. Along the journey, we will get to know OpenCL from concept to best practices in its API usage just enough for us to put into great use later when we deal with DLL implementation in C++ and consume it with MQL5.
As I have validated that MetaTrader 5 is able to list out all devices included GPU as seen in Journal tab, so there is no issue with graphics driver installed on my Linux machine. It's not a problem with either it is open source or proprietary graphics driver. Thus we could say at this point that it is highly likely a bug in device selection code whenever those two flags as mentioned have been used with CLContextCreate(). We shall take this problem as our motivation to conduct a validation for our assumption of the bug, then proceed next to develop a full-fledge solution later in the series. The major benefit of our effort is to allow us to understand more about OpenCL concepts, its terminology, and most importantly how we can use its API in efficient manner especially when we use it with MQL5 to develop related tools on MetaTrader 5 platform.Author: Wasin Thonkaew