1 #include <petsc/private/petscimpl.h> 2 3 #if defined(PETSC_HAVE_CUDA) 4 #include <cuda_runtime.h> 5 #endif 6 7 #if defined(PETSC_HAVE_HIP) 8 #include <hip/hip_runtime.h> 9 #endif 10 11 static PetscInt petsc_checkpointer_intensity = 1; 12 13 /*@ 14 PetscCheckPointerSetIntensity - An intense pointer check registers a signal handler and attempts to dereference to 15 confirm whether the address is valid. An intensity of 0 never uses signal handlers, 1 uses them when not in a "hot" 16 function, and intensity of 2 always uses a signal handler. 17 18 Not Collective 19 20 Input Parameter: 21 . intensity - how much to check pointers for validity 22 23 Options Database: 24 . -check_pointer_intensity - intensity (0, 1, or 2) 25 26 Level: advanced 27 28 .seealso: PetscCheckPointer(), PetscFunctionBeginHot() 29 @*/ 30 PetscErrorCode PetscCheckPointerSetIntensity(PetscInt intensity) 31 { 32 33 PetscFunctionBegin; 34 switch (intensity) { 35 case 0: 36 case 1: 37 case 2: 38 petsc_checkpointer_intensity = intensity; 39 break; 40 default: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Intensity %D not in 0,1,2",intensity); 41 } 42 PetscFunctionReturn(0); 43 } 44 45 /* ---------------------------------------------------------------------------------------*/ 46 47 #if defined(PETSC_HAVE_SETJMP_H) 48 #include <setjmp.h> 49 static jmp_buf PetscSegvJumpBuf; 50 static PetscBool PetscSegvJumpBuf_set; 51 52 /*@C 53 PetscSignalSegvCheckPointerOrMpi - To be called from a signal handler for SIGSEGV. If the signal was received 54 while executing PetscCheckPointer()/PetscCheckMpiXxxAwareness(), this function longjmps back there, otherwise returns 55 with no effect. This function is called automatically by PetscSignalHandlerDefault(). 56 57 Not Collective 58 59 Level: developer 60 61 .seealso: PetscPushSignalHandler() 62 @*/ 63 void PetscSignalSegvCheckPointerOrMpi(void) 64 { 65 if (PetscSegvJumpBuf_set) longjmp(PetscSegvJumpBuf,1); 66 } 67 68 /*@C 69 PetscCheckPointer - Returns PETSC_TRUE if a pointer points to accessible data 70 71 Not Collective 72 73 Input Parameters: 74 + ptr - the pointer 75 - dtype - the type of data the pointer is suppose to point to 76 77 Level: developer 78 79 .seealso: PetscCheckPointerSetIntensity() 80 @*/ 81 PetscBool PetscCheckPointer(const void *ptr,PetscDataType dtype) 82 { 83 84 if (PETSC_RUNNING_ON_VALGRIND) return PETSC_TRUE; 85 if (!ptr) return PETSC_FALSE; 86 if (petsc_checkpointer_intensity < 1) return PETSC_TRUE; 87 88 /* Skip the verbose check if we are inside a hot function. */ 89 if (petscstack && petscstack->hotdepth > 0 && petsc_checkpointer_intensity < 2) return PETSC_TRUE; 90 91 PetscSegvJumpBuf_set = PETSC_TRUE; 92 93 if (setjmp(PetscSegvJumpBuf)) { 94 /* A segv was triggered in the code below hence we return with an error code */ 95 PetscSegvJumpBuf_set = PETSC_FALSE; 96 return PETSC_FALSE; 97 } else { 98 switch (dtype) { 99 case PETSC_INT:{ 100 PETSC_UNUSED PetscInt x = (PetscInt)*(volatile PetscInt*)ptr; 101 break; 102 } 103 #if defined(PETSC_USE_COMPLEX) 104 case PETSC_SCALAR:{ /* C++ is seriously dysfunctional with volatile std::complex. */ 105 #if defined(PETSC_USE_CXXCOMPLEX) 106 PetscReal xreal = ((volatile PetscReal*)ptr)[0],ximag = ((volatile PetscReal*)ptr)[1]; 107 PETSC_UNUSED volatile PetscScalar x = xreal + PETSC_i*ximag; 108 #else 109 PETSC_UNUSED PetscScalar x = *(volatile PetscScalar*)ptr; 110 #endif 111 break; 112 } 113 #endif 114 case PETSC_REAL:{ 115 PETSC_UNUSED PetscReal x = *(volatile PetscReal*)ptr; 116 break; 117 } 118 case PETSC_BOOL:{ 119 PETSC_UNUSED PetscBool x = *(volatile PetscBool*)ptr; 120 break; 121 } 122 case PETSC_ENUM:{ 123 PETSC_UNUSED PetscEnum x = *(volatile PetscEnum*)ptr; 124 break; 125 } 126 case PETSC_CHAR:{ 127 PETSC_UNUSED char x = *(volatile char*)ptr; 128 break; 129 } 130 case PETSC_OBJECT:{ 131 PETSC_UNUSED volatile PetscClassId classid = ((PetscObject)ptr)->classid; 132 break; 133 } 134 default:; 135 } 136 } 137 PetscSegvJumpBuf_set = PETSC_FALSE; 138 return PETSC_TRUE; 139 } 140 141 #define PetscMPICUPMAwarnessCheckFunction \ 142 PetscBool PetscMPICUPMAwarenessCheck(void) \ 143 { \ 144 cupmError_t cerr=cupmSuccess; \ 145 int ierr,hbuf[2]={1,0},*dbuf=NULL; \ 146 PetscBool awareness=PETSC_FALSE; \ 147 cerr = cupmMalloc((void**)&dbuf,sizeof(int)*2);if (cerr != cupmSuccess) return PETSC_FALSE; \ 148 cerr = cupmMemcpy(dbuf,hbuf,sizeof(int)*2,cupmMemcpyHostToDevice);if (cerr != cupmSuccess) return PETSC_FALSE; \ 149 PetscSegvJumpBuf_set = PETSC_TRUE; \ 150 if (setjmp(PetscSegvJumpBuf)) { \ 151 /* If a segv was triggered in the MPI_Allreduce below, it is very likely due to the MPI is not GPU-aware */ \ 152 awareness = PETSC_FALSE; \ 153 } else { \ 154 ierr = MPI_Allreduce(dbuf,dbuf+1,1,MPI_INT,MPI_SUM,PETSC_COMM_SELF); \ 155 if (!ierr) awareness = PETSC_TRUE; \ 156 } \ 157 PetscSegvJumpBuf_set = PETSC_FALSE; \ 158 cerr = cupmFree(dbuf);if (cerr != cupmSuccess) return PETSC_FALSE; \ 159 return awareness; \ 160 } 161 162 #if defined(PETSC_HAVE_CUDA) 163 #define cupmError_t cudaError_t 164 #define cupmMalloc cudaMalloc 165 #define cupmMemcpy cudaMemcpy 166 #define cupmFree cudaFree 167 #define cupmSuccess cudaSuccess 168 #define cupmMemcpyHostToDevice cudaMemcpyHostToDevice 169 #define PetscMPICUPMAwarenessCheck PetscMPICUDAAwarenessCheck 170 PetscMPICUPMAwarnessCheckFunction 171 #endif 172 173 #if defined(PETSC_HAVE_HIP) 174 #define cupmError_t hipError_t 175 #define cupmMalloc hipMalloc 176 #define cupmMemcpy hipMemcpy 177 #define cupmFree hipFree 178 #define cupmSuccess hipSuccess 179 #define cupmMemcpyHostToDevice hipMemcpyHostToDevice 180 #define PetscMPICUPMAwarenessCheck PetscMPIHIPAwarenessCheck 181 PetscMPICUPMAwarnessCheckFunction 182 #endif 183 184 #else 185 void PetscSignalSegvCheckPointerOrMpi(void) 186 { 187 return; 188 } 189 190 PetscBool PetscCheckPointer(const void *ptr,PETSC_UNUSED PetscDataType dtype) 191 { 192 if (!ptr) return PETSC_FALSE; 193 return PETSC_TRUE; 194 } 195 196 #if defined (PETSC_HAVE_CUDA) 197 PetscBool PetscMPICUDAAwarenessCheck(void) 198 { 199 /* If no setjmp (rare), return true and let users code run (and segfault if they should) */ 200 return PETSC_TRUE; 201 } 202 #endif 203 204 #if defined (PETSC_HAVE_HIP) 205 PetscBool PetscMPIHIPAwarenessCheck(void) 206 { 207 /* If no setjmp (rare), return true and let users code run (and segfault if they should) */ 208 return PETSC_TRUE; 209 } 210 #endif 211 212 #endif 213