Actual source code: mal.c

petsc-3.6.1 2015-07-22
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  2: /*
  3:     Code that allows a user to dictate what malloc() PETSc uses.
  4: */
  5: #include <petscsys.h>             /*I   "petscsys.h"   I*/
  6: #if defined(PETSC_HAVE_MALLOC_H)
  7: #include <malloc.h>
  8: #endif

 10: /*
 11:         We want to make sure that all mallocs of double or complex numbers are complex aligned.
 12:     1) on systems with memalign() we call that routine to get an aligned memory location
 13:     2) on systems without memalign() we
 14:        - allocate one sizeof(PetscScalar) extra space
 15:        - we shift the pointer up slightly if needed to get PetscScalar aligned
 16:        - if shifted we store at ptr[-1] the amount of shift (plus a classid)
 17: */
 18: #define SHIFT_CLASSID 456123

 22: PetscErrorCode  PetscMallocAlign(size_t mem,int line,const char func[],const char file[],void **result)
 23: {
 24:   if (!mem) { *result = NULL; return 0; }
 25: #if defined(PETSC_HAVE_DOUBLE_ALIGN_MALLOC) && (PETSC_MEMALIGN == 8)
 26:   *result = malloc(mem);
 27: #elif defined(PETSC_HAVE_MEMALIGN)
 28:   *result = memalign(PETSC_MEMALIGN,mem);
 29: #else
 30:   {
 31:     /*
 32:       malloc space for two extra chunks and shift ptr 1 + enough to get it PetscScalar aligned
 33:     */
 34:     int *ptr = (int*)malloc(mem + 2*PETSC_MEMALIGN);
 35:     if (ptr) {
 36:       int shift    = (int)(((PETSC_UINTPTR_T) ptr) % PETSC_MEMALIGN);
 37:       shift        = (2*PETSC_MEMALIGN - shift)/sizeof(int);
 38:       ptr[shift-1] = shift + SHIFT_CLASSID;
 39:       ptr         += shift;
 40:       *result      = (void*)ptr;
 41:     } else {
 42:       *result      = NULL;
 43:     }
 44:   }
 45: #endif
 46:   if (!*result) return PetscError(PETSC_COMM_SELF,line,func,file,PETSC_ERR_MEM,PETSC_ERROR_INITIAL,"Memory requested %.0f",(PetscLogDouble)mem);
 47:   return 0;
 48: }

 52: PetscErrorCode  PetscFreeAlign(void *ptr,int line,const char func[],const char file[])
 53: {
 54:   if (!ptr) return 0;
 55: #if (!(defined(PETSC_HAVE_DOUBLE_ALIGN_MALLOC) && (PETSC_MEMALIGN == 8)) && !defined(PETSC_HAVE_MEMALIGN))
 56:   {
 57:     /*
 58:       Previous int tells us how many ints the pointer has been shifted from
 59:       the original address provided by the system malloc().
 60:     */
 61:     int shift = *(((int*)ptr)-1) - SHIFT_CLASSID;
 62:     if (shift > PETSC_MEMALIGN-1) return PetscError(PETSC_COMM_SELF,line,func,file,PETSC_ERR_PLIB,PETSC_ERROR_INITIAL,"Likely memory corruption in heap");
 63:     if (shift < 0) return PetscError(PETSC_COMM_SELF,line,func,file,PETSC_ERR_PLIB,PETSC_ERROR_INITIAL,"Likely memory corruption in heap");
 64:     ptr = (void*)(((int*)ptr) - shift);
 65:   }
 66: #endif

 68: #if defined(PETSC_HAVE_FREE_RETURN_INT)
 69:   int err = free(ptr);
 70:   if (err) return PetscError(PETSC_COMM_SELF,line,func,file,PETSC_ERR_PLIB,PETSC_ERROR_INITIAL,"System free returned error %d\n",err);
 71: #else
 72:   free(ptr);
 73: #endif
 74:   return 0;
 75: }

 77: PetscErrorCode (*PetscTrMalloc)(size_t,int,const char[],const char[],void**) = PetscMallocAlign;
 78: PetscErrorCode (*PetscTrFree)(void*,int,const char[],const char[])           = PetscFreeAlign;

 80: PetscBool petscsetmallocvisited = PETSC_FALSE;

 84: /*@C
 85:    PetscMallocSet - Sets the routines used to do mallocs and frees.
 86:    This routine MUST be called before PetscInitialize() and may be
 87:    called only once.

 89:    Not Collective

 91:    Input Parameters:
 92: +  malloc - the malloc routine
 93: -  free - the free routine

 95:    Level: developer

 97:    Concepts: malloc
 98:    Concepts: memory^allocation

100: @*/
101: PetscErrorCode  PetscMallocSet(PetscErrorCode (*imalloc)(size_t,int,const char[],const char[],void**),
102:                                               PetscErrorCode (*ifree)(void*,int,const char[],const char[]))
103: {
105:   if (petscsetmallocvisited && (imalloc != PetscTrMalloc || ifree != PetscTrFree)) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"cannot call multiple times");
106:   PetscTrMalloc         = imalloc;
107:   PetscTrFree           = ifree;
108:   petscsetmallocvisited = PETSC_TRUE;
109:   return(0);
110: }

114: /*@C
115:    PetscMallocClear - Resets the routines used to do mallocs and frees to the
116:         defaults.

118:    Not Collective

120:    Level: developer

122:    Notes:
123:     In general one should never run a PETSc program with different malloc() and
124:     free() settings for different parts; this is because one NEVER wants to
125:     free() an address that was malloced by a different memory management system

127: @*/
128: PetscErrorCode  PetscMallocClear(void)
129: {
131:   PetscTrMalloc         = PetscMallocAlign;
132:   PetscTrFree           = PetscFreeAlign;
133:   petscsetmallocvisited = PETSC_FALSE;
134:   return(0);
135: }

139: PetscErrorCode PetscMemoryTrace(const char label[])
140: {
141:   PetscErrorCode        ierr;
142:   PetscLogDouble        mem,mal;
143:   static PetscLogDouble oldmem = 0,oldmal = 0;

146:   PetscMemoryGetCurrentUsage(&mem);
147:   PetscMallocGetCurrentUsage(&mal);

149:   PetscPrintf(PETSC_COMM_WORLD,"%s High water  %8.3f MB increase %8.3f MB Current %8.3f MB increase %8.3f MB\n",label,mem*1e-6,(mem - oldmem)*1e-6,mal*1e-6,(mal - oldmal)*1e-6);
150:   oldmem = mem;
151:   oldmal = mal;
152:   return(0);
153: }