1 2 #include <petscsys.h> 3 4 /*@C 5 PetscOptionsGetenv - Gets an environmental variable, broadcasts to all 6 processors in communicator from first. 7 8 Collective 9 10 Input Parameters: 11 + comm - communicator to share variable 12 . name - name of environmental variable 13 - len - amount of space allocated to hold variable 14 15 Output Parameters: 16 + flag - if not NULL tells if variable found or not 17 - env - value of variable 18 19 Level: advanced 20 21 Notes: 22 You can also "set" the environmental variable by setting the options database value 23 -name "stringvalue" (with name in lower case). If name begins with PETSC_ this is 24 discarded before checking the database. For example, PETSC_VIEWER_SOCKET_PORT would 25 be given as -viewer_socket_port 9000 26 27 If comm does not contain the 0th process in the MPIEXEC it is likely on 28 many systems that the environmental variable will not be set unless you 29 put it in a universal location like a .chsrc file 30 31 @*/ 32 PetscErrorCode PetscOptionsGetenv(MPI_Comm comm,const char name[],char env[],size_t len,PetscBool *flag) 33 { 34 PetscErrorCode ierr; 35 PetscMPIInt rank; 36 char *str,work[256]; 37 PetscBool flg = PETSC_FALSE,spetsc; 38 39 PetscFunctionBegin; 40 /* first check options database */ 41 ierr = PetscStrncmp(name,"PETSC_",6,&spetsc);CHKERRQ(ierr); 42 43 ierr = PetscStrcpy(work,"-");CHKERRQ(ierr); 44 if (spetsc) { 45 ierr = PetscStrlcat(work,name+6,sizeof(work));CHKERRQ(ierr); 46 } else { 47 ierr = PetscStrlcat(work,name,sizeof(work));CHKERRQ(ierr); 48 } 49 ierr = PetscStrtolower(work);CHKERRQ(ierr); 50 if (env) { 51 ierr = PetscOptionsGetString(NULL,NULL,work,env,len,&flg);CHKERRQ(ierr); 52 if (flg) { 53 if (flag) *flag = PETSC_TRUE; 54 } else { /* now check environment */ 55 ierr = PetscArrayzero(env,len);CHKERRQ(ierr); 56 57 ierr = MPI_Comm_rank(comm,&rank);CHKERRMPI(ierr); 58 if (rank == 0) { 59 str = getenv(name); 60 if (str) flg = PETSC_TRUE; 61 if (str && env) {ierr = PetscStrncpy(env,str,len);CHKERRQ(ierr);} 62 } 63 ierr = MPI_Bcast(&flg,1,MPIU_BOOL,0,comm);CHKERRMPI(ierr); 64 ierr = MPI_Bcast(env,len,MPI_CHAR,0,comm);CHKERRMPI(ierr); 65 if (flag) *flag = flg; 66 } 67 } else { 68 ierr = PetscOptionsHasName(NULL,NULL,work,flag);CHKERRQ(ierr); 69 } 70 PetscFunctionReturn(0); 71 } 72 73 /* 74 PetscSetDisplay - Tries to set the X windows display variable for all processors. 75 The variable PetscDisplay contains the X windows display variable. 76 77 */ 78 static char PetscDisplay[256]; 79 80 static PetscErrorCode PetscWorldIsSingleHost(PetscBool *onehost) 81 { 82 PetscErrorCode ierr; 83 char hostname[256],roothostname[256]; 84 PetscMPIInt localmatch,allmatch; 85 PetscBool flag; 86 87 PetscFunctionBegin; 88 ierr = PetscGetHostName(hostname,sizeof(hostname));CHKERRQ(ierr); 89 ierr = PetscMemcpy(roothostname,hostname,sizeof(hostname));CHKERRQ(ierr); 90 ierr = MPI_Bcast(roothostname,sizeof(roothostname),MPI_CHAR,0,PETSC_COMM_WORLD);CHKERRMPI(ierr); 91 ierr = PetscStrcmp(hostname,roothostname,&flag);CHKERRQ(ierr); 92 93 localmatch = (PetscMPIInt)flag; 94 95 ierr = MPIU_Allreduce(&localmatch,&allmatch,1,MPI_INT,MPI_LAND,PETSC_COMM_WORLD);CHKERRMPI(ierr); 96 97 *onehost = (PetscBool)allmatch; 98 PetscFunctionReturn(0); 99 } 100 101 PetscErrorCode PetscSetDisplay(void) 102 { 103 PetscErrorCode ierr; 104 PetscMPIInt size,rank; 105 PetscBool flag,singlehost=PETSC_FALSE; 106 char display[sizeof(PetscDisplay)]; 107 const char *str; 108 109 PetscFunctionBegin; 110 ierr = PetscOptionsGetString(NULL,NULL,"-display",PetscDisplay,sizeof(PetscDisplay),&flag);CHKERRQ(ierr); 111 if (flag) PetscFunctionReturn(0); 112 113 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRMPI(ierr); 114 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRMPI(ierr); 115 116 ierr = PetscWorldIsSingleHost(&singlehost);CHKERRQ(ierr); 117 118 str = getenv("DISPLAY"); 119 if (!str) str = ":0.0"; 120 #if defined(PETSC_HAVE_X) 121 flag = PETSC_FALSE; 122 ierr = PetscOptionsGetBool(NULL,NULL,"-x_virtual",&flag,NULL);CHKERRQ(ierr); 123 if (flag) { 124 /* this is a crude hack, but better than nothing */ 125 ierr = PetscPOpen(PETSC_COMM_WORLD,NULL,"pkill -9 Xvfb","r",NULL);CHKERRQ(ierr); 126 ierr = PetscSleep(1);CHKERRQ(ierr); 127 ierr = PetscPOpen(PETSC_COMM_WORLD,NULL,"Xvfb :15 -screen 0 1600x1200x24","r",NULL);CHKERRQ(ierr); 128 ierr = PetscSleep(5);CHKERRQ(ierr); 129 str = ":15"; 130 } 131 #endif 132 if (str[0] != ':' || singlehost) { 133 ierr = PetscStrncpy(display,str,sizeof(display));CHKERRQ(ierr); 134 } else if (rank == 0) { 135 ierr = PetscGetHostName(display,sizeof(display));CHKERRQ(ierr); 136 ierr = PetscStrlcat(display,str,sizeof(display));CHKERRQ(ierr); 137 } 138 ierr = MPI_Bcast(display,sizeof(display),MPI_CHAR,0,PETSC_COMM_WORLD);CHKERRMPI(ierr); 139 ierr = PetscMemcpy(PetscDisplay,display,sizeof(PetscDisplay));CHKERRQ(ierr); 140 141 PetscDisplay[sizeof(PetscDisplay)-1] = 0; 142 PetscFunctionReturn(0); 143 } 144 145 /* 146 PetscGetDisplay - Gets the display variable for all processors. 147 148 Input Parameters: 149 . n - length of string display 150 151 Output Parameters: 152 . display - the display string 153 154 Options Database: 155 + -display <display> - sets the display to use 156 - -x_virtual - forces use of a X virtual display Xvfb that will not display anything but -draw_save will still work. Xvfb is automatically 157 started up in PetscSetDisplay() with this option 158 159 */ 160 PetscErrorCode PetscGetDisplay(char display[],size_t n) 161 { 162 PetscErrorCode ierr; 163 164 PetscFunctionBegin; 165 ierr = PetscStrncpy(display,PetscDisplay,n);CHKERRQ(ierr); 166 PetscFunctionReturn(0); 167 } 168