1 2 /* 3 This is to allow one to measure CPU time usage of their job, 4 NOT real time usage. Do not use this for reported timings, speedup etc. 5 */ 6 7 #include <petscsys.h> /*I "petscsys.h" I*/ 8 #include <ctype.h> 9 #include <sys/types.h> 10 #include <sys/stat.h> 11 #if defined(PETSC_HAVE_STDLIB_H) 12 #include <stdlib.h> 13 #endif 14 #if defined(PETSC_HAVE_SYS_UTSNAME_H) 15 #include <sys/utsname.h> 16 #endif 17 #if defined(PETSC_HAVE_TIME_H) 18 #include <time.h> 19 #endif 20 #if defined(PETSC_HAVE_SYS_SYSTEMINFO_H) 21 #include <sys/systeminfo.h> 22 #endif 23 24 #if defined(PETSC_HAVE_SYS_TIMES_H) 25 26 #include <sys/times.h> 27 #include <limits.h> 28 #undef __FUNCT__ 29 #define __FUNCT__ "PetscGetCPUTime" 30 PetscErrorCode PetscGetCPUTime(PetscLogDouble *t) 31 { 32 struct tms temp; 33 34 PetscFunctionBegin; 35 times(&temp); 36 *t = ((double)temp.tms_utime)/((double)CLOCKS_PER_SEC); 37 PetscFunctionReturn(0); 38 } 39 40 #elif defined(PETSC_HAVE_CLOCK) 41 42 #include <time.h> 43 #include <sys/types.h> 44 45 #undef __FUNCT__ 46 #define __FUNCT__ "PetscGetCPUTime" 47 PetscErrorCode PetscGetCPUTime(PetscLogDouble *t) 48 { 49 PetscFunctionBegin; 50 *t = ((double)clock()) / ((double)CLOCKS_PER_SEC); 51 PetscFunctionReturn(0); 52 } 53 54 #else 55 56 #include <sys/types.h> 57 #include <sys/time.h> 58 #include <sys/resource.h> 59 60 #undef __FUNCT__ 61 #define __FUNCT__ "PetscGetCPUTime" 62 /*@ 63 PetscGetCPUTime - Returns the CPU time in seconds used by the process. 64 65 Not Collective 66 67 Output Parameter: 68 . t - Time in seconds charged to the process. 69 70 Example: 71 .vb 72 #include <petscsys.h> 73 ... 74 PetscLogDouble t1, t2; 75 76 ierr = PetscGetCPUTime(&t1);CHKERRQ(ierr); 77 ... code to time ... 78 ierr = PetscGetCPUTime(&t2);CHKERRQ(ierr); 79 printf("Code took %f CPU seconds\n", t2-t1); 80 .ve 81 82 Level: intermediate 83 84 Notes: 85 One should use PetscGetTime() or the -log_summary option of 86 PETSc for profiling. The CPU time is NOT a realistic number to 87 use since it does not include the time for message passing etc. 88 Also on many systems the accuracy is only on the order of microseconds. 89 @*/ 90 PetscErrorCode PetscGetCPUTime(PetscLogDouble *t) 91 { 92 static struct rusage temp; 93 PetscLogDouble foo,foo1; 94 95 PetscFunctionBegin; 96 getrusage(RUSAGE_SELF,&temp); 97 foo = temp.ru_utime.tv_sec; /* seconds */ 98 foo1 = temp.ru_utime.tv_usec; /* uSecs */ 99 *t = foo + foo1 * 1.0e-6; 100 PetscFunctionReturn(0); 101 } 102 103 #endif 104