pbzip2 get different outputsize on different OS

Hi all,

I do a testing,compress the file1.tar on different OS on the same machine with the same pbzip2.but I got the different outputsize of file.tar.bz2.

code download from http://compression.ca/pbzip2/

I don't know why.please show me the way
thanks

It's most likely a bug.

However, here's what you should do: after zipping the file on each machine, unzip it again, and compare the files using cmp or diff. If they are identical, don't worry about it.