- 直接
new DirectMemReporter().startReport();
调用就可以了 -
netty4.1x默认使用池化的bytebuf,每个池子初始16mb,使用直接内存的最大池子数默认16,由jvm启动参数决定
-Dio.netty.allocator.numDirectArenas
。默认最大堆外内存默认3817865216 bytes,由-Dio.netty.maxDirectMemory
决定@Slf4j public class DirectMemReporter { private AtomicLong directMem = new AtomicLong(); private ScheduledExecutorService executor = MoreExecutors.getExitingScheduledExecutorService( new ScheduledThreadPoolExecutor(1), 10, TimeUnit.SECONDS); public DirectMemReporter() { Field field = ReflectionUtils.findField(PlatformDependent.class, "DIRECT_MEMORY_COUNTER"); field.setAccessible(true); try { directMem = (AtomicLong) field.get(PlatformDependent.class); } catch (IllegalAccessException e) {} } public void startReport() { executor.scheduleAtFixedRate(() -> { log.info("netty direct memory size:{}b, max:{}", directMem.get(), PlatformDependent.maxDirectMemory()); }, 0, 1, TimeUnit.SECONDS); } }
netty堆外内存监控
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转载自blog.csdn.net/liyantianmin/article/details/86380859
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