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[OpenCL:Feature] Accelerate MmapAllocator::read by replacing per-call lseek+read with mmap-based memcpy #4323

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[OpenCL:Feature] Accelerate MmapAllocator::read by replacing per-call lseek+read with mmap-based memcpy #4323

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c3cf754
Accelerate OpenCLMmapAllocator::read() by replacing lseek+read syscal…
Riverspring996 Mar 26, 2026
21f7392
Merge branch 'master' into opencl_memcpy_read
Riverspring996 Apr 1, 2026
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8 changes: 7 additions & 1 deletion source/backend/opencl/core/MmapPool.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -54,7 +54,13 @@ class OpenCLMmapAllocator {
OpenCLMmapAllocator(const char* dirName, const char* prefix, const char* posfix, bool autoRemove);
~ OpenCLMmapAllocator() {
for (auto& iter : mCache) {
MNNCloseFile(std::get<0>(iter.second));
void* addr = std::get<2>(iter.second);
size_t size = std::get<1>(iter.second);
file_t file = std::get<0>(iter.second);
if (addr != nullptr) {
MNNUnmapFile(addr, size);
}
MNNCloseFile(file);
if (mRemove) {
MNNRemoveFile(iter.first.c_str());
std::string cacheName = mPrefix + "sync." + mPosfix;
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