Question

以下测试从PooledByteBufAllocator竞技场输出数字，当我运行它时，数字与实际分配/解除分配不匹配。实际分配：50000 实际解除分配：50000 活动缓冲区：0

输出显示以下内容： directActive 1 directAlloc 1 directDealloc 0 heapActive 0 heapAlloc 0 heapDealloc 0

import io.netty.buffer.ByteBuf;
import io.netty.buffer.PoolArenaMetric;
import io.netty.buffer.PooledByteBufAllocator;
import io.netty.util.ResourceLeakDetector;
import io.netty.util.ResourceLeakDetector.Level;

import org.junit.Test;

public class NettyTest2 {
    public static PooledByteBufAllocator alloc = new PooledByteBufAllocator(true); 

    @Test
    public void test() throws InterruptedException {
        ResourceLeakDetector.setLevel(Level.PARANOID);

        for (int i = 0; i < 50000; i++) {
            ByteBuf b = alloc.buffer(1000, 1000);
            b.release();
        }

        Thread.sleep(100);

        //alloc.freeThreadLocalCache();

        showActiveDirectBuffers();
        showActiveHeapBuffers();
    }

    void showActiveDirectBuffers() {
        int directActive = 0, directAlloc = 0, directDealloc = 0;
        for (PoolArenaMetric arena : alloc.directArenas()) {
            directActive += arena.numActiveAllocations();
            directAlloc += arena.numAllocations();
            directDealloc += arena.numDeallocations();
        }
        System.out.println("directActive " + directActive + " directAlloc " + directAlloc + " directDealloc " + directDealloc);
    }

    void showActiveHeapBuffers() {
        int heapActive = 0, heapAlloc = 0, heapDealloc = 0;
        for (PoolArenaMetric arena : alloc.heapArenas()) {
            heapActive += arena.numActiveAllocations();
            heapAlloc += arena.numAllocations();
            heapDealloc += arena.numDeallocations();
        }
        System.out.println("heapActive " + heapActive + " heapAlloc " + heapAlloc + " heapDealloc " + heapDealloc);
    }
}

Answer 1

问题与Allocators的内部缓存有关。具有禁用缓存的分配器显示与实际调用匹配的alloc / dealloc编号。

使用以下方式创建带有禁用缓存的PooledBufferAllocator（如https://github.com/netty/netty/issues/5275中所述）

PooledByteBufAllocator alloc = new PooledByteBufAllocator(true, 1, 1, 8192, 11, 0, 0, 0);

Netty 4 PooledByteBufAllocator返回有关分配/解除分配的错误信息

1 个答案: