When I used the option "-fast" in the mpiifort it got
ld: cannot find -ldl
error, and could not build the executable file.
BTW, the executable file can be built without "-fast" option.
In addition, "-O3 -ipo -no-prec-div -static -xhost" didn't work, too.
Software used is:
OS is: RedHat 4.4.7-11