My linux cluster has installed ifort compiler now.
But for some purpose, I need pgi compiler in the same computer.
Can they coexist? I'm not familiar with this area, afraid of meeting trouble.
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You'll be fine, using multiple compilers (Fortran or any other language) is pretty common, and their default installations shouldn't interfere with each other.
Of course, anytime you're using multiple compilers for a language, you should organize your projects so that you remember which compiler you targeted. At a minimum, make a note in a README or INSTALL file, so that you and other users can easily compile your software in the future.