<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。
