Runtime.cpp

/*
Copyright [2024] [Yao Yao]

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

*/

#include "Runtime.h"
#include "cuda_utils.h"
#include "CudaMemPool.h"
#include "StorageManager.h"
#include <cstring>

inline bool operator==(const cudaTextureDesc& a, const cudaTextureDesc& b) {
    return std::memcmp(&a, &b, sizeof(cudaTextureDesc)) == 0;
}

namespace cudapp
{
Runtime::Runtime(const fs::path& cacheFolder, size_t nbRandStream,
    size_t devPoolMaxBytes, size_t pinnedPoolMaxBytes, size_t sysPoolMaxBytes,
    size_t deviceSoftLimit, size_t pinnedSoftLimit, size_t sysSoftLimit)
: mCachePath{cacheFolder}
, mRandStreams{nbRandStream, makeCudaStream, cudaStreamNonBlocking}
, mEventPool{cudapp::getCudaEventPool()}
, mCudaDaemon{cudapp::getCudaDaemon()}
, mCudaMemPools{
    std::make_unique<cudapp::storage::CudaMemPool<CudaMemType::kDevice>>(devPoolMaxBytes),
    std::make_unique<cudapp::storage::CudaMemPool<CudaMemType::kPinned>>(pinnedPoolMaxBytes),
    std::make_unique<cudapp::storage::CudaMemPool<CudaMemType::kSystem>>(sysPoolMaxBytes)}
, mStorageManager{std::make_unique<cudapp::storage::StorageManager>(deviceSoftLimit, pinnedSoftLimit, sysSoftLimit)}
{
    cudaMemPool<CudaMemType::kDevice>().setOnArrayFreeCallback([this](cudaArray_t array){
        invalidateTexObjCacheEntry(array);
    });
    if (fs::exists(cacheFolder) && !fs::is_directory(cacheFolder)) {
        fs::remove_all(cacheFolder);
    }
    if (!fs::exists(cacheFolder)) {
        fs::create_directory(cacheFolder);
    }
    for (auto& f : fs::directory_iterator(cacheFolder)) {
        fs::remove_all(f);
    }
    ASSERT(fs::is_empty(cacheFolder));
}

cudaTextureObject_t Runtime::createTexObjCached(cudaArray_t array, const cudaTextureDesc& texDesc) {
    std::lock_guard lk{mTexObjCacheLock};
    const auto iterArr = mTexObjCache.find(array);
    if (iterArr != mTexObjCache.end()) {
        const auto iterVec = std::find_if(iterArr->second.begin(), iterArr->second.end(), [&texDesc](const std::pair<cudaTextureDesc, cudapp::TexObj>& entry){
            return entry.first == texDesc;
        });
        if (iterVec != iterArr->second.end()) {
            return iterVec->second.get();
        }
    }
    return mTexObjCache[array].emplace_back(texDesc, cudapp::createTexObj(array, texDesc)).second.get();
}

void Runtime::invalidateTexObjCacheEntry(cudaArray_t array) {
    std::lock_guard lk{mTexObjCacheLock};
    mTexObjCache.erase(array);
}

Runtime::~Runtime() = default;

IRuntime::~IRuntime() = default;

extern "C" IRuntime* createRuntimeCudappImpl(const char* cacheFolder, size_t nbRandStream,
    size_t devPoolMaxBytes, size_t pinnedPoolMaxBytes, size_t sysPoolMaxBytes,
    size_t deviceSoftLimit, size_t pinnedSoftLimit, size_t sysSoftLimit)
{
    return new Runtime(cacheFolder, nbRandStream, devPoolMaxBytes,
        pinnedPoolMaxBytes, sysPoolMaxBytes,
        deviceSoftLimit, pinnedSoftLimit, sysSoftLimit);
}
} // namespace cudapp