Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

On my machine using a normal hard drive, a sum -s on a 5 GB file takes 2 seconds, while sum -r takes 5.5 seconds.

   -r     use BSD sum algorithm, use 1K blocks

   -s, --sysv
          use System V sum algorithm, use 512 bytes blocks

How can this be? I would expect larger blocks to perform better!

share|improve this question
add comment

Your Answer

 
discard

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

Browse other questions tagged or ask your own question.