On Wed, Nov 07, 2007 at 07:26:56AM +0900, murphy wrote: > strange. is it the generate.rb or the test.rb that's slowing down? > [murphy] Good catch - I thought I was running generate.rb under 1.8.2 under both cases but I wasn't. Made the fix and the problem is still there: [pbrannan@zem tmp]$ cat run.sh #!/bin/sh n=$1 echo -n "$n " ruby generate.rb $n | ruby test.rb ruby generate.rb $n | ruby1.9 -Ka test.rb | grep -v patchlevel [pbrannan@zem tmp]$ ./run.sh 5000000 5000000 18.104177 35.888206 Paul