about ISCreateGeneral() and MatGetSubMatrices()

[Yujie]

I am wondering how to use ISCreateGeneral().

Assuming I use 2cpus when I run my codes. I use MPI_COMM to create an object
of IS using ISCreateGeneral() and an array on a single cpu. how to
distribute this IS object on these 2cpus? If I use MatGetSubMatrices() to
get different submatrices on different cpus. I am wondering how to create IS
object, using PETSC_COMM_SELF? thanks a lot.

Regards,

Yujie
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