GraphicsMagick 的 OpenCL 开发记录（三）

本文主要是介绍GraphicsMagick 的 OpenCL 开发记录（三），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

<2022-03-07 Mon>

调用clCreateBuffer()产生异常问题（一）

在vscode上的堆栈输出如下：

libc.so.6!__pthread_kill_implementation (Unknown Source:0)
libc.so.6!raise (Unknown Source:0)
libc.so.6!abort (Unknown Source:0)
libigdrcl.so![Unknown/Just-In-Time compiled code] (Unknown Source:0)
libOpenCL.so!clCreateBuffer (Unknown Source:0)
AcquireMagickCLCacheInfo(MagickCLDevice device, Quantum * pixels, const magick_int64_t length) (gm-ocl/magick/opencl.c:569)
GetAuthenticOpenCLBuffer(const Image * image, MagickCLDevice device, ExceptionInfo * exception) (gm-ocl/magick/pixel_cache.c:5252)

因为堆栈显示问题最终是出在__pthread_kill_implementation上，所以我的调查方向一直在线程同步上，代码调试了一遍又一遍却始终没有找到问题。心灰意冷并已经产生从头再开始的想法了。

注意到：

libigdrcl.so![Unknown/Just-In-Time compiled code] (Unknown Source:0)

谷歌了下libigdrcl.so，难道是安装intel驱动的问题？目前使用的是intel-compute-runtime，现改为intel-opencl-runtime，参考自：“GPGPU - ArchWiki”。

$ sudo pacman -Rns intel-compute-runtime
$ yay -S intel-opencl-runtime

我对比了intel-compute-runtime和intel-opencl-runtime的clinfo输出差异发现intel-compute-runtime支持GPU，intel-opencl-runtime支持CPU。

那代码到底有没有问题？clCreateBuffer()调用失败的原因要不要深究？

vscode环境

// tasks.json
{// See https://go.microsoft.com/fwlink/?LinkId=733558// for the documentation about the tasks.json format"version": "2.0.0","tasks": [{"label": "build with opencl","type": "shell","command": "make","problemMatcher": [],"group": {"kind": "build","isDefault": true}}]
}

// launch.json
{// Use IntelliSense to learn about possible attributes.// Hover to view descriptions of existing attributes.// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387"version": "0.2.0","configurations": [{"name": "(gdb) Launch","type": "cppdbg","request": "launch","program": "${workspaceFolder}/utilities/gm","args": ["display", "~/temp/bg1a.jpg"],"stopAtEntry": false,"cwd": "${fileDirname}","environment": [{"name": "MAGICK_OCL_DEVICE","value": "true"}],"externalConsole": false,"MIMode": "gdb","setupCommands": [{"description": "Enable pretty-printing for gdb","text": "-enable-pretty-printing","ignoreFailures": true},{"description":  "Set Disassembly Flavor to Intel","text": "-gdb-set disassembly-flavor intel","ignoreFailures": true}]}]
}

正在用的dev.sh内容如下：

#!/bin/bash./configure CFLAGS='-g -O0' LDFLAGS='-ldl' --enable-opencl --prefix=$HOME/usr/local

见commit：partially fix crash when replacing intel-compute-runtime with intel-opencl-runtime。

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