代码：
// g++ -std=c++17 -O0 -g -Wall -Wextra -lOpenCL query.cpp -o query
// valgrind --leak-check=full --track-origins=yes --tool=memcheck ./query N
#include <CL/cl.h>
#include <CL/cl.hpp>
#include <vector>
#include <string>
#include <iostream>
#include <memory>
using namespace std;
#define CL_CHECK_ERROR(error) \
if ((error) != CL_SUCCESS){ cout << "ERROR in " << __FILE__ << ":" << __LINE__ << "\n"; }
int main(int, char * argv[])
{
int type = stoi(argv[1]);
string info_buffer;
int info_buffer_size = 1024;
info_buffer.reserve(info_buffer_size);
if (type == 0){
vector<cl_platform_id> platforms;
cl_uint num_platforms;
CL_CHECK_ERROR(clGetPlatformIDs(0, NULL, &num_platforms));
cout << "num_platforms: " << num_platforms << "\n";
platforms.reserve(num_platforms);
platforms.resize(num_platforms);
CL_CHECK_ERROR(clGetPlatformIDs(num_platforms, platforms.data(), NULL));
cout << "- " << platforms.data()[0] << "\n";
// cout << "- " << platforms.data()[1] << "\n";
// cout << platforms.size() << "\n";
for (auto& platform : platforms){
cout << platform << "\n";
size_t size;
CL_CHECK_ERROR(clGetPlatformInfo(platform, CL_PLATFORM_NAME, 0, NULL, &size));
info_buffer.resize(size); // works also with size - 1
CL_CHECK_ERROR(clGetPlatformInfo(platform, CL_PLATFORM_NAME, size, info_buffer.data(), NULL));
cout << "platform: '" << info_buffer << "'\n";
}
}else if (type == 1){
cl_uint num_platforms;
CL_CHECK_ERROR(clGetPlatformIDs(0, NULL, &num_platforms));
cout << "num_platforms: " << num_platforms << "\n";
unique_ptr<cl_platform_id[]> platforms(new cl_platform_id[num_platforms]);
CL_CHECK_ERROR(clGetPlatformIDs(num_platforms, platforms.get(), NULL));
cout << "- " << platforms[0] << "\n";
// cout << "- " << platforms[1] << "\n";
for (uint i=0; i<num_platforms; i++){
cl_platform_id platform = platforms[i];
cout << platforms[i] << "\n";
size_t size;
CL_CHECK_ERROR(clGetPlatformInfo(platform, CL_PLATFORM_NAME, 0, NULL, &size));
info_buffer.resize(size); // works also with size - 1
CL_CHECK_ERROR(clGetPlatformInfo(platform, CL_PLATFORM_NAME, size, info_buffer.data(), NULL));
cout << "platform: '" << info_buffer << "'\n";
}
} else {
vector<cl::Platform> platforms;
cl::Platform::get(&platforms);
cout << "num_platforms: " << platforms.size() << "\n";
cout << "- " << platforms.at(0)() << "\n";
// cout << "- " << platforms[1] << "\n";
for (auto& platform : platforms) {
CL_CHECK_ERROR(platform.getInfo(CL_PLATFORM_NAME, &info_buffer));
cout << "platform: " << info_buffer << "\n";
}
}
return 0;
}
汇编：
g++ -std=c++17 -O0 -g -Wall -Wextra -lOpenCL query.cpp -o query
Valgrind的：
valgrind --leak-check=full --track-origins=yes --tool=memcheck ./query 0 2>query_t0.memcheck
valgrind --leak-check=full --track-origins=yes --tool=memcheck ./query 1 2>query_t1.memcheck
valgrind --leak-check=full --track-origins=yes --tool=memcheck ./query 2 2>query_t2.memcheck
在t0和t1情况下（.h）：
==8877== LEAK SUMMARY:
==8877== definitely lost: 2,804 bytes in 19 blocks
==8877== indirectly lost: 1,444 bytes in 9 blocks
==8877== possibly lost: 152 bytes in 1 blocks
==8877== still reachable: 3,056,953 bytes in 1,706 blocks
==8877== of which reachable via heuristic:
==8877== newarray : 7,192 bytes in 7 blocks
==8877== suppressed: 0 bytes in 0 blocks
==8877== Reachable blocks (those to which a pointer was found) are not shown.
==8877== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==8877==
==8877== For counts of detected and suppressed errors, rerun with: -v
==8877== ERROR SUMMARY: 231 errors from 76 contexts (suppressed: 1 from 1)
在t2（.hpp）：
==32316== LEAK SUMMARY:
==32316== definitely lost: 2,956 bytes in 20 blocks
==32316== indirectly lost: 1,444 bytes in 9 blocks
==32316== possibly lost: 0 bytes in 0 blocks
==32316== still reachable: 3,056,953 bytes in 1,706 blocks
==32316== of which reachable via heuristic:
==32316== newarray : 7,192 bytes in 7 blocks
==32316== suppressed: 0 bytes in 0 blocks
==32316== Reachable blocks (those to which a pointer was found) are not shown.
==32316== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==32316==
==32316== For counts of detected and suppressed errors, rerun with: -v
==32316== ERROR SUMMARY: 230 errors from 75 contexts (suppressed: 1 from 1)
一些错误（来自t2）：
==32316== 168 (144 direct, 24 indirect) bytes in 1 blocks are definitely lost in loss record 1,201 of 1,366
==32316== at 0x4C2CEBF: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==32316== by 0xB4DDF64: Priv_Main_Control_Refresh() (in /usr/lib/libatiadlxx.so)
==32316== by 0xB4E669F: ADL_Main_Control_Refresh_X() (in /usr/lib/libatiadlxx.so)
==32316== by 0xB4F3073: ADL2_Main_Control_Refresh (in /usr/lib/libatiadlxx.so)
==32316== by 0xB4F58E1: ADL2_Main_Control_Create (in /usr/lib/libatiadlxx.so)
==32316== by 0x7A50470: ??? (in /usr/lib/libamdocl64.so)
==32316== by 0x7D6F340: ??? (in /usr/lib/libamdocl64.so)
==32316== by 0x7D3F8C6: ??? (in /usr/lib/libamdocl64.so)
==32316== by 0x7D3F91B: ??? (in /usr/lib/libamdocl64.so)
==32316== by 0x7D44C73: ??? (in /usr/lib/libamdocl64.so)
==32316== by 0x7D2E7C6: ??? (in /usr/lib/libamdocl64.so)
==32316== by 0x7A27F26: ??? (in /usr/lib/libamdocl64.so)
==32316==
==32316== 278 (240 direct, 38 indirect) bytes in 1 blocks are definitely lost in loss record 1,225 of 1,366
==32316== at 0x4C2D51F: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==32316== by 0x63C2DD7: ??? (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x6339563: ??? (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x6339F61: ??? (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x634FD84: clGetPlatformIDs (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x4E3EBD1: ??? (in /usr/lib/libOpenCL.so.1.0.0)
==32316== by 0x4E3FE83: clGetPlatformIDs (in /usr/lib/libOpenCL.so.1.0.0)
==32316== by 0x10B77C: cl::Platform::get(std::vector<cl::Platform, std::allocator<cl::Platform> >*) (cl.hpp:2338)
==32316== by 0x10B143: main (query.cpp:69)
==32316==
==32316== 286 (248 direct, 38 indirect) bytes in 1 blocks are definitely lost in loss record 1,227 of 1,366
==32316== at 0x4C2D51F: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==32316== by 0x63C2F09: ??? (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x6339563: ??? (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x6339F61: ??? (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x634FD84: clGetPlatformIDs (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x4E3EBD1: ??? (in /usr/lib/libOpenCL.so.1.0.0)
==32316== by 0x4E3FE83: clGetPlatformIDs (in /usr/lib/libOpenCL.so.1.0.0)
==32316== by 0x10B77C: cl::Platform::get(std::vector<cl::Platform, std::allocator<cl::Platform> >*) (cl.hpp:2338)
==32316== by 0x10B143: main (query.cpp:69)
==32316==
==32316== 512 bytes in 1 blocks are definitely lost in loss record 1,252 of 1,366
==32316== at 0x4C2D51F: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==32316== by 0x63EEAA5: ??? (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x63F4526: ??? (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x63F4B73: ??? (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x6339486: ??? (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x6339F61: ??? (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x634FD84: clGetPlatformIDs (in /opt/intel/opencl-runtime/lib64/libintelocl.so)
==32316== by 0x4E3EBD1: ??? (in /usr/lib/libOpenCL.so.1.0.0)
==32316== by 0x4E3FE83: clGetPlatformIDs (in /usr/lib/libOpenCL.so.1.0.0)
==32316== by 0x10B77C: cl::Platform::get(std::vector<cl::Platform, std::allocator<cl::Platform> >*) (cl.hpp:2338)
==32316== by 0x10B143: main (query.cpp:69)
==32316==
==32316== 1,520 bytes in 10 blocks are definitely lost in loss record 1,290 of 1,366
==32316== at 0x4C2CEBF: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==32316== by 0xD45BEBD: amdcl::scCompileImpl::Text2Stream(amdcl::_il_string_rec const&, amdcl::_il_binary_rec&) (in /usr/lib/libamdocl12cl64.so)
==32316== by 0xD463218: amdcl::AMDIL::toBinary(char const*, unsigned long*) (in /usr/lib/libamdocl12cl64.so)
==32316== by 0xD4646BD: amdcl::AMDIL::compile(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, amdcl::scCompileBase*) (in /usr/lib/libamdocl12cl64.so)
==32316== by 0xD46306F: amdcl::AMDIL::compile(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) (in /usr/lib/libamdocl12cl64.so)
==32316== by 0xCF80AB3: AMDILFEToISA(_acl_loader_data_0_8**, char const*, unsigned long) (in /usr/lib/libamdocl12cl64.so)
==32316== by 0xCF828B4: if_aclCompile(_acl_compiler_rec_0_8_1*, _acl_bif_rec_0_8_1*, char const*, _acl_type_enum_0_8, _acl_type_enum_0_8, void (*)(char const*, unsigned long)) (in /usr/lib/libamdocl12cl64.so)
==32316== by 0x82C35D8: aclCompile (in /usr/lib/libamdocl64.so)
==32316== by 0x79930E7: ??? (in /usr/lib/libamdocl64.so)
==32316== by 0x799375F: ??? (in /usr/lib/libamdocl64.so)
==32316== by 0x79A2111: ??? (in /usr/lib/libamdocl64.so)
==32316== by 0x79A4929: ??? (in /usr/lib/libamdocl64.so)
如您所见，我尝试了三种不同的方式来查询平台（t0，t1使用C API，t2使用C ++ API）。如何删除代码中的内存泄漏？我做错了吗？
根据来自76个上下文的231个错误，我的文件只出现在4（C）或3（C ++）消息中（grep 'cpp' query_t1.memcheck vs grep 'lost' query_t1.memcheck）。那么，如果不从我的代码中泄露，如何删除那些内存泄漏？我可以在那里做点什么吗？
示例：
==32316== by 0x10B143: main (query.cpp:69)
==32316== by 0x10B143: main (query.cpp:69)
==32316== by 0x10B143: main (query.cpp:69)
==32316== 8 bytes in 1 blocks are definitely lost in loss record 53 of 1,366
==32316== 8 bytes in 1 blocks are definitely lost in loss record 54 of 1,366
==32316== 8 bytes in 1 blocks are definitely lost in loss record 55 of 1,366
==32316== 8 bytes in 1 blocks are definitely lost in loss record 56 of 1,366
==32316== 20 bytes in 1 blocks are definitely lost in loss record 94 of 1,366
==32316== 168 (144 direct, 24 indirect) bytes in 1 blocks are definitely lost in loss record 1,201 of 1,366
==32316== 278 (240 direct, 38 indirect) bytes in 1 blocks are definitely lost in loss record 1,225 of 1,366
==32316== 286 (248 direct, 38 indirect) bytes in 1 blocks are definitely lost in loss record 1,227 of 1,366
==32316== 512 bytes in 1 blocks are definitely lost in loss record 1,252 of 1,366
==32316== 1,520 bytes in 10 blocks are definitely lost in loss record 1,290 of 1,366
==32316== 1,584 (240 direct, 1,344 indirect) bytes in 1 blocks are definitely lost in loss record 1,291 of 1,366
==32316== definitely lost: 2,956 bytes in 20 blocks
==32316== indirectly lost: 1,444 bytes in 9 blocks
==32316== possibly lost: 0 bytes in 0 blocks
答案 0 :(得分：2)
在valgrind中使用pocl git master运行你的程序，结果：
==21413== Memcheck, a memory error detector
==21413== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==21413== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==21413== Command: ./query 1
==21413==
num_platforms: 1
- 0x840df40
0x840df40
platform: 'Portable Computing Language'
==21413==
==21413== HEAP SUMMARY:
==21413== in use at exit: 74,145 bytes in 858 blocks
==21413== total heap usage: 1,058 allocs, 200 frees, 421,333 bytes allocated
==21413==
==21413== LEAK SUMMARY:
==21413== definitely lost: 0 bytes in 0 blocks
==21413== indirectly lost: 0 bytes in 0 blocks
==21413== possibly lost: 0 bytes in 0 blocks
==21413== still reachable: 74,145 bytes in 858 blocks
==21413== suppressed: 0 bytes in 0 blocks
==21413== Reachable blocks (those to which a pointer was found) are not shown.
==21413== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==21413==
==21413== For counts of detected and suppressed errors, rerun with: -v
==21413== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
因此...
如何删除代码中的内存泄漏？我做错了吗？
你没有做错任何事。 AMD / Intel的实现并不完全没有memleak：）