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我正在尋找.NET TPL Dataflow庫的C++模擬。英特爾TBB計算圖:如何指定節點的輸入隊列容量
在TPL數據流中,您可以指定塊的容量選項的並行度&。如果該塊的輸入隊列的大小達到它的容量,則相應的塊的生成器的執行被掛起:
var buffer = new BufferBlock<int>(new DataflowBlockOptions() { BoundedCapacity = 10 });
var producer = new Task(() => {
for (int i = 0; i < 1000; i++) {
buffer.Post(i);
}
});
var fstAction = new TransformBlock<int, int>(async (i) => {
return i*i;
}, MaxDegreeOfParallelism = 4, BoundedCapacity = 10);
var sndAction = new ActionBlock<int>(async (i) => {
Thread.Sleep(5000);
Console.WriteLine(i);
}, MaxDegreeOfParallelism = 4, BoundedCapacity = 10);
buffer.LinkTo(fstAction, new DataflowLinkOptions() { PropagateCompletion = true });
fstAction.LinkTo(sndAction, new DataflowLinkOptions() { PropagateCompletion = true });
sndAction.Completition.Wait();
我需要用C類似的功能++。 TBB似乎是一個很好的選擇,但是我找不到如何在function_node
/buffer_node
上指定容量。下面是一個例子:
std::size_t exportConcurrency = 16;
std::size_t uploadConcurrency = 16;
flow::graph graph;
std::size_t count = 1000;
std::size_t idx = 0;
flow::source_node<std::vector<std::string>> producerNode(graph, [&count, &idx](auto& out) {
out = { "0"s };
return ++idx != count;
});
flow::function_node<std::vector<std::string>, std::string> exportNode(graph, exportConcurrency, [](auto& ids) {
return "0"s;
});
flow::function_node<std::string, std::string> uploadNode(graph, uploadConcurrency, [](auto& chunk) {
std::this_thread::sleep_for(5s);
return "0"s;
});
flow::make_edge(producerNode, exportNode);
flow::make_edge(exportNode, uploadNode);
graph.wait_for_all();
看來,TBB流程圖沒有直接的接口來指定緩衝區的容量。但是,這可能是您的問題可以通過TBB以不同方式解決。爲了權衡幾個變體,你能提供更多關於你正試圖解決的問題的信息嗎? – Aleksei