$ sudo perl -d:DProf -e1

##</code><code>##

$ sudo strace -eopen perl -d:DProf -e1
...
open("/usr/local/perl/5.12.2/lib/5.12.2/x86_64-linux-thread-multi/Devel/DProf.pm", O_RDONLY) = 4
open("/usr/local/perl/5.12.2/lib/5.12.2/XSLoader.pm", O_RDONLY) = 5
open("/usr/local/perl/5.12.2/lib/5.12.2/x86_64-linux-thread-multi/auto/Devel/DProf/DProf.so", O_RDONLY) = 4
open("tmon.out", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 4