Dtrace

…in Solaris 10 and Mac OS X >= 10.5

• http://www.brendangregg.com/dtrace.html
• http://www.opensolaris.org/os/community/dtrace/

Hey, which processes are trashing my disks?

$ sudo dtrace -n 'io:::start { @[pid, execname] = sum(args[0]->b_bcount); }'

In Os X, get more details on what's happening with the dtrace-based script iosnoop.