Hey, I've not looked into this at all, but looks like diff(1) could be optimised:
# With GNU diff: $ time gdiff -u file1 file2 > out-gdiff gdiff -u file1 file2 > out-gdiff 0.16s user 0.13s system 101% cpu 0.286 total # With OpenBSD diff: $ time diff -u file1 file2 > out-bdiff diff -u file1 file2 > out-bdiff 1005.24s user 0.33s system 99% cpu 16:46.44 total Admittedly the files are big (~10MB each), but still. Good news is, the outcomes are the same bar the diff header syntax: ---8<--- $ gdiff -u out-bdiff out-gdiff --- out-bdiff 2016-02-13 18:15:42.991267362 +0000 +++ out-gdiff 2016-02-13 17:58:47.153912520 +0000 @@ -1,5 +1,5 @@ ---- file1 Wed Feb 4 13:20:14 2015 -+++ file2 Wed Feb 4 13:20:14 2015 +--- file1 2015-02-04 13:20:14.899249552 +0000 ++++ file2 2015-02-04 13:20:14.859249471 +0000 @@ -62,7 +62,7 @@ TaskState::packetPending: HandlerTask::fn: --->8--- Tarred up files: http://theunixzoo.co.uk/random/diff_files.tgz -- Best Regards Edd Barrett http://www.theunixzoo.co.uk
