Take the 2-minute tour ×
Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

While my application is running (with a lot of traffic), I see this in error log but I dont even understand what it is about. I guess it's optimizing some configuration but I need a more formal explaination.

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
share|improve this question

1 Answer 1

up vote 8 down vote accepted

That is verbose output from the optipng utility for shrinking PNG images. You may suppress this output with the --quiet option. Though probably one of your gems is calling it and you have little control over whether it passes the option.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.