当我的应用程序正在运行时（流量很大），我在错误日志中看到这个，但我甚至不明白它是什么。我猜它正在优化一些配置，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
答案1
这是来自optipng用于缩小 PNG 图像的实用程序。您可以使用选项隐藏此输出--quiet。虽然您的某个 gem 可能正在调用它，但您几乎无法控制是否它通过该选项。