说实话，Java 21虚拟线程的出现，咱就是说是Java开发者的福音啊！特别是对比传统线程，性Neng提升那是杠杠的。

先说理论上，虚拟线程Neng带来近5倍的性Neng提升。

理论 80ms->400oms真实129ms ->470ms

Ke以kan到真实结果有近似5倍的提升 应正了理论上5倍的提升

模拟的两个微服务客户端：

@Componentpublic class UserServiceClient { private static final Logger log = LoggerFactory.getLogger; private final RestTemplate restTemplate; public UserServiceClient { this.restTemplate = restTemplate; } public User getUser { log.info); try { Thread.sleep; } catch { Thread.currentThread.interrupt; } User user = new User; log.info); return user; }}

@Componentpublic class ProductServiceClient { private static final Logger log = LoggerFactory.getLogger; private final RestTemplate restTemplate; public ProductServiceClient { this.restTemplate = restTemplate; } public Product getProduct { log.info); try { Thread.sleep; } catch { Thread.currentThread.interrupt; } Product product = new Product); log.info); return product; }}

控制测试类：

@Servicepublic class OrderService { private static final Logger log = LoggerFactory.getLogger; private final UserServiceClient userServiceClient; private final ProductServiceClient productServiceClient; public OrderService { this.userServiceClient = userServiceClient; this.productServiceClient = productServiceClient; } public Order createOrder { log.info); User user = userServiceClient.getUser; Product product = productServiceClient.getProduct; Order order = new Order, user.id, product.id, product.price ); log.info); return order; } public Order createOrderParallel { log.info); try ) { CompletableFuture userFuture = CompletableFuture.supplyAsync -> userServiceClient.getUser, virtualExecutor ); CompletableFuture productFuture = CompletableFuture.supplyAsync -> productServiceClient.getProduct, virtualExecutor ); User user = userFuture.join; Product product = productFuture.join; Order order = new Order, user.id, product.id, product.price ); log.info); return order; } } public Order createOrderParallelWithOutVirtual { log.info - 线程: {}", Thread.currentThread); CompletableFuture userFuture = CompletableFuture.supplyAsync -> userServiceClient.getUser ); CompletableFuture productFuture = CompletableFuture.supplyAsync -> productServiceClient.getProduct ); User user = userFuture.join; Product product = productFuture.join; Order order = new Order, user.id, product.id, product.price ); log.info - 线程: {}", Thread.currentThread); return order; }} 使用场景

Web应用、微服务高并发I/O操作网络客户端、爬虫事件处理、消息队列消费

Ke以kan到平均的内存占用才3kb 相比于MB 级别的平台线程 提升hen大

有五种组合测试来探索 虚拟线程 vs 传统线程池的效率重点关注组合 因为 组合 是直接体现虚拟线程和传统线程池的区别、 是为了对比 Ru果内部的fork join池也去使用虚拟线程池去构建会存在什么结果对于1 、 我们 理论分析下

传统线程池+串行：200个线程是瓶颈传统线程池+ForkJoin：ForkJoin的7个线程是geng严重的瓶颈双重瓶颈：200个外层线程 × 7个内层ForkJoin线程 = 实际并发度hen低

我们来kan真实的执行效果：

因为纯CPU计算，没有I/O操作 无法让渡载体线程

Java 21虚拟线程性Neng优势明显。特别是与传统线程池相比，在某些场景下Neng带来数倍的性Neng提升。

楼主全程手打创作不易 点点关注 收藏 点赞吧 谢谢朋友