# PetscMemoryGetMaximumUsage

Returns the maximum resident set size (memory used) for the program.

### Synopsis

    #include "petsc.h"
    PetscErrorCode  PetscMemoryGetMaximumUsage(PetscLogDouble *mem)

Not Collective

### Output Parameter

mem -memory usage in bytes

### Options Database Key

-memory_info -Print memory usage at end of run
-malloc_log -Activate logging of memory usage

### Notes

The memory usage reported here includes all Fortran arrays (that may be used in application-defined sections of code). This routine thus provides a more complete picture of memory usage than PetscMallocGetCurrentUsage() for codes that employ Fortran with hardwired arrays.

### See Also

PetscMallocGetMaximumUsage(), PetscMemoryGetCurrentUsage(), PetscMallocGetCurrentUsage(),
PetscMemorySetGetMaximumUsage()

Level:intermediate
Location: src/sys/memory/mem.c
Index of all Sys routines
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Index of all manual pages