[Pw_forum] What is the function of "drho_e" file?

[xirainbow]

Dear all:

           When I do ph.x calculation, there are "drho_e1, drho_e2,
drho_e3" files in the running directory.
           The name of "drho_e" files do not change with prefix of the
phonon.input file.

           Are "drho_e1, drho_e2, drho_e3" files  are used by ph.x or
by dynmat.x or other pp?

           Can I run many ph.x in the same directory at the same time  ?

           Thank you in advance :)

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Hui Wang
School of physics, Fudan University, Shanghai, China