Check the URL http://www.research.att.com/sw/tools/ for further details.
ObLinux:
David Korn had a few good things to say about Linux.
Quoting from his USENIX paper:
There appear to be few if any technical reasons to
move from UNIX to Windows NT. The performance of
Linux(*) exceeds that of NT 4.0 and Linux appears to
be more reliable. On three occasions NT 4.0 crashed
when running the performance tests. There were no
crashes with Linux.
(*) Windows NT 4.0 vs Linux 2.0.18 on a 32Mb 133MHz P5 Micron.
-taj