当我的应用程序正在运行（有很多stream量）时，我在错误日志中看到这个，但是我甚至不明白它是什么。 我想这是优化一些configuration，但我需要更正式的解释。
App 13214 stderr: Trying: App 13214 stderr: zc = 9 zm = 9 zs = 0 f = 0 App 13214 stderr: IDAT size = 5698 App 13214 stderr: zc = 9 zm = 8 zs = 0 f = 0 App 13214 stderr: IDAT size = 5698 App 13214 stderr: zc = 9 zm = 9 zs = 1 f = 0 App 13214 stderr: IDAT size = 5561 App 13214 stderr: zc = 9 zm = 8 zs = 1 f = 0 App 13214 stderr: IDAT size = 5561 App 13214 stderr: zc = 1 zm = 9 zs = 2 f = 0 zc = 1 zm = 8 zs = 2 f = 0 zc = 9 zm = 9 zs = 3 f = 0 zc = 9 zm = 8 zs = 3 f = 0 zc = 9 zm = 9 zs = 0 f = 1 zc = 9 zm = 8 zs = 0 f = 1 zc = 9 zm = 9 zs = 1 f = 1 zc = 9 zm = 8 zs = 1 f = 1 zc = 1 zm = 9 zs = 2 f = 1 zc = 1 zm = 8 zs = 2 f = 1 zc = 9 zm = 9 zs = 3 f = 1 zc = 9 zm = 8 zs = 3 f = 1 zc = 9 zm = 9 zs = 0 f = 2 zc = 9 zm = 8 zs = 0 f = 2 zc = 9 zm = 9 zs = 1 f = 2 zc = 9 zm = 8 zs = 1 f = 2 zc = 1 zm = 9 zs = 2 f = 2 zc = 1 zm = 8 zs = 2 f = 2 zc = 9 zm = 9 zs = 3 f = 2 zc = 9 zm = 8 zs = 3 f = 2 zc = 9 zm = 9 zs = 0 f = 3 zc = 9 zm = 8 zs = 0 f = 3 zc = 9 zm = 9 zs = 1 f = 3 zc = 9 zm = 8 zs = 1 f = 3 zc = 1 zm = 9 zs = 2 f = 3 zc = 1 zm = 8 zs = 2 f = 3 zc = 9 zm = 9 zs = 3 f = 3 zc = 9 zm = 8 zs = 3 f = 3 zc = 9 zm = 9 zs = 0 f = 4 zc = 9 zm = 8 zs = 0 f = 4 zc = 9 zm = 9 zs = 1 f = 4 zc = 9 zm = 8 zs = 1 f = 4 zc = 1 zm = 9 zs = 2 f = 4 zc = 1 zm = 8 zs = 2 f = 4 zc = 9 zm = 9 zs = 3 f = 4 zc = 9 zm = 8 zs = 3 f = 4 zc = 9 zm = 9 zs = 0 f = 5 zc = 9 zm = 8 zs = 0 f = 5 zc = 9 zm = 9 zs = 1 f = 5 zc = 9 zm = 8 zs = 1 f = 5 zc = 1 zm = 9 zs = 2 f = 5 zc = 1 zm = 8 zs = 2 f = 5 zc = 9 zm = 9 zs = 3 f = 5 zc = 9 zm = 8 zs = 3 f = 5 这是optipng实用程序收缩PNG图像的详细输出。 你可以用--quiet选项来禁止这个输出。 虽然可能你的gem之一就是这么称呼它，而你是否通过了这个选项却没有什么控制权。