Actual source code: verboseinfo.c
petsc-3.15.0 2021-03-30
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      1: /*
      2:       PetscInfo() is contained in a different file from the other profiling to
      3:    allow it to be replaced at link time by an alternative routine.
      4: */
      5: #include <petsc/private/petscimpl.h>

      7: /*
      8:   The next set of variables determine which, if any, PetscInfo() calls are used.
      9:   If PetscLogPrintInfo is false, no info messages are printed.

     11:   If PetscInfoFlags[OBJECT_CLASSID - PETSC_SMALLEST_CLASSID] is zero, no messages related
     12:   to that object are printed. OBJECT_CLASSID is, for example, MAT_CLASSID.
     13:   Note for developers: the PetscInfoFlags array is currently 160 entries large, to ensure headroom. Perhaps it is worth
     14:   dynamically allocating this array intelligently rather than just some big number.

     16:   PetscInfoFilename determines where PetscInfo() output is piped.
     17:   PetscInfoClassnames holds a char array of classes which are filtered out/for in PetscInfo() calls.
     18: */
     19: const char * const        PetscInfoCommFlags[] = {"all", "no_self", "only_self", "PetscInfoCommFlag", "PETSC_INFO_COMM_", NULL};
     20: static PetscBool          PetscInfoClassesLocked = PETSC_FALSE, PetscInfoInvertClasses = PETSC_FALSE, PetscInfoClassesSet = PETSC_FALSE;
     21: static char               **PetscInfoClassnames = NULL;
     22: static char               *PetscInfoFilename = NULL;
     23: static PetscInt           PetscInfoNumClasses = -1;
     24: static PetscInfoCommFlag  PetscInfoCommFilter = PETSC_INFO_COMM_ALL;
     25: static int                PetscInfoFlags[]  = {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
     26:                                                1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
     27:                                                1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
     28:                                                1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
     29:                                                1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
     30:                                                1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
     31:                                                1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
     32:                                                1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
     33:                                                1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
     34:                                                1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
     35: PetscBool                 PetscLogPrintInfo = PETSC_FALSE;
     36: FILE                      *PetscInfoFile = NULL;

     38: /*@
     39:     PetscInfoEnabled - Checks whether a given OBJECT_CLASSID is allowed to print using PetscInfo()

     41:     Not Collective

     43:     Input Parameters:
     44: .   classid - PetscClassid retrieved from a PetscObject e.g. VEC_CLASSID

     46:     Output Parameter:
     47: .   enabled - PetscBool indicating whether this classid is allowed to print

     49:     Notes:
     50:     Use PETSC_SMALLEST_CLASSID to check if "sys" PetscInfo() calls are enabled. When PETSc is configured with debugging
     51:     support this function checks if classid >= PETSC_SMALLEST_CLASSID, otherwise it assumes valid classid.

     53:     Level: advanced

     55: .seealso: PetscInfo(), PetscInfoAllow(), PetscInfoGetInfo(), PetscObjectGetClassid()
     56: @*/
     57: PetscErrorCode PetscInfoEnabled(PetscClassId classid, PetscBool *enabled)
     58: {
     60:   if (classid < PETSC_SMALLEST_CLASSID) SETERRQ1(PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Classid (current: %d) must be equal to or greater than PETSC_SMALLEST_CLASSID", classid);
     61:   *enabled = (PetscBool) (PetscLogPrintInfo && PetscInfoFlags[classid - PETSC_SMALLEST_CLASSID]);
     62:   return(0);
     63: }

     65: /*@
     66:     PetscInfoAllow - Enables/disables PetscInfo() messages

     68:     Not Collective

     70:     Input Parameter:
     71: .   flag - PETSC_TRUE or PETSC_FALSE

     73:     Level: advanced

     75: .seealso: PetscInfo(), PetscInfoEnabled(), PetscInfoGetInfo(), PetscInfoSetFromOptions()
     76: @*/
     77: PetscErrorCode PetscInfoAllow(PetscBool flag)
     78: {
     80:   PetscLogPrintInfo = flag;
     81:   return(0);
     82: }

     84: /*@C
     85:     PetscInfoSetFile - Sets the printing destination for all PetscInfo() calls

     87:     Not Collective

     89:     Input Parameter:
     90: +   filename - Name of the file where PetscInfo() will print to
     91: -   mode - Write mode passed to PetscFOpen()

     93:     Notes:
     94:     Use filename=NULL to set PetscInfo() to write to PETSC_STDOUT.

     96:     Level: advanced

     98: .seealso: PetscInfo(), PetscInfoSetFile(), PetscInfoSetFromOptions(), PetscFOpen()
     99: @*/
    100: PetscErrorCode PetscInfoSetFile(const char filename[], const char mode[])
    101: {
    102:   char            fname[PETSC_MAX_PATH_LEN], tname[11];
    103:   PetscMPIInt     rank;
    104:   PetscErrorCode  ierr;

    107:   if (!PetscInfoFile) PetscInfoFile = PETSC_STDOUT;
    108:   PetscFree(PetscInfoFilename);
    109:   if (filename) {
    110:     PetscBool  oldflag;
    112:     PetscFixFilename(filename, fname);
    113:     PetscStrallocpy(fname, &PetscInfoFilename);
    114:     MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    115:     sprintf(tname, ".%d", rank);
    116:     PetscStrcat(fname, tname);
    117:     oldflag = PetscLogPrintInfo; PetscLogPrintInfo = PETSC_FALSE;
    118:     PetscFOpen(MPI_COMM_SELF, fname, mode, &PetscInfoFile);
    119:     PetscLogPrintInfo = oldflag;
    120:     /* PetscFOpen will write to PETSC_STDOUT and not PetscInfoFile here, so we disable the PetscInfo call inside it, and
    121:      call it afterwards so that it actually writes to file */
    122:     PetscInfo1(NULL, "Opened PetscInfo file %s\n", fname);
    123:   }
    124:   return(0);
    125: }

    127: /*@C
    128:     PetscInfoGetFile - Gets the name and FILE pointer of the file where PetscInfo() prints to

    130:     Not Collective

    132:     Output Parameters:
    133: +   filename - The name of the output file
    134: -   InfoFile - The FILE pointer for the output file

    136:     Level: advanced

    138:     Note:
    139:     This routine allocates and copies the filename so that the filename survives PetscInfoDestroy(). The user is
    140:     therefore responsible for freeing the allocated filename pointer afterwards.

    142:     Fortran Note:
    143:     This routine is not supported in Fortran.

    145: .seealso: PetscInfo(), PetscInfoSetFile(), PetscInfoSetFromOptions(), PetscInfoDestroy()
    146: @*/
    147: PetscErrorCode PetscInfoGetFile(char **filename, FILE **InfoFile)
    148: {
    149:   PetscErrorCode  ierr;

    154:   PetscStrallocpy(PetscInfoFilename, filename);
    155:   *InfoFile = PetscInfoFile;
    156:   return(0);
    157: }

    159: /*@C
    160:     PetscInfoSetClasses - Sets the classes which PetscInfo() is filtered for/against

    162:     Not Collective

    164:     Input Parameters:
    165: +   exclude - Whether or not to invert the filter, i.e. if exclude is true, PetscInfo() will print from every class that
    166:     is NOT one of the classes specified
    167: .   N - Number of classes to filter for (size of classnames)
    168: -   classnames - String array containing the names of classes to filter for, e.g. "vec"

    170:     Notes:
    171:     Not for use in Fortran

    173:     This function CANNOT be called after PetscInfoGetClass() or PetscInfoProcessClass() has been called.

    175:     Names in the classnames list should correspond to the names returned by PetscObjectGetClassName().

    177:     This function only sets the list of class names.
    178:     The actual filtering is deferred to PetscInfoProcessClass(), except of sys which is processed right away.
    179:     The reason for this is that we need to set the list of included/excluded classes before their classids are known.
    180:     Typically the classid is assigned and PetscInfoProcessClass() called in <Class>InitializePackage() (e.g. VecInitializePackage()).

    182:     Level: developer

    184: .seealso: PetscInfo(), PetscInfoGetClass(), PetscInfoProcessClass(), PetscInfoSetFromOptions(), PetscStrToArray(), PetscObjectGetName()
    185: @*/
    186: PetscErrorCode PetscInfoSetClasses(PetscBool exclude, PetscInt N, const char *const *classnames)
    187: {
    188:   PetscErrorCode  ierr;

    191:   if (PetscInfoClassesLocked) SETERRQ(PETSC_COMM_SELF, PETSC_ERR_ARG_WRONGSTATE, "PetscInfoSetClasses() cannot be called after PetscInfoGetClass() or PetscInfoProcessClass()");
    192:   PetscStrNArrayDestroy(PetscInfoNumClasses, &PetscInfoClassnames);
    193:   PetscStrNArrayallocpy(N, classnames, &PetscInfoClassnames);
    194:   PetscInfoNumClasses = N;
    195:   PetscInfoInvertClasses = exclude;
    196:   {
    197:     /* Process sys class right away */
    198:     PetscClassId  sysclassid = PETSC_SMALLEST_CLASSID;
    199:     PetscInfoProcessClass("sys", 1, &sysclassid);
    200:   }
    201:   PetscInfoClassesSet = PETSC_TRUE;
    202:   return(0);
    203: }

    205: /*@C
    206:     PetscInfoGetClass - Indicates whether the provided classname is marked as a filter in PetscInfo() as set by PetscInfoSetClasses()

    208:     Not Collective

    210:     Input Paramater:
    211: .   classname - Name of the class to search for

    213:     Output Parameter:
    214: .   found - PetscBool indicating whether the classname was found

    216:     Notes:
    217:     Use PetscObjectGetName() to retrieve an appropriate classname

    219:     Level: developer

    221: .seealso: PetscInfo(), PetscInfoSetClasses(), PetscInfoSetFromOptions(), PetscObjectGetName()
    222: @*/
    223: PetscErrorCode PetscInfoGetClass(const char *classname, PetscBool *found)
    224: {
    225:   PetscInt        idx;
    226:   PetscErrorCode  ierr;

    230:   PetscEListFind(PetscInfoNumClasses, (const char *const *) PetscInfoClassnames, classname ? classname : "sys", &idx, found);
    231:   PetscInfoClassesLocked = PETSC_TRUE;
    232:   return(0);
    233: }

    235: /*@
    236:     PetscInfoGetInfo - Returns the current state of several important flags for PetscInfo()

    238:     Not Collective

    240:     Output Parameters:
    241: +   infoEnabled - PETSC_TRUE if PetscInfoAllow(PETSC_TRUE) has been called
    242: .   classesSet - PETSC_TRUE if the list of classes to filter for has been set
    243: .   exclude - PETSC_TRUE if the class filtering for PetscInfo() is inverted
    244: .   locked - PETSC_TRUE if the list of classes to filter for has been locked
    245: -   commSelfFlag - Enum indicating whether PetscInfo() will print for communicators of size 1, any size != 1, or all
    246:     communicators

    248:     Notes:
    249:     Initially commSelfFlag = PETSC_INFO_COMM_ALL

    251:     Level: developer

    253: .seealso: PetscInfo(), PetscInfoAllow(), PetscInfoSetFilterCommSelf, PetscInfoSetFromOptions()
    254: @*/
    255: PetscErrorCode PetscInfoGetInfo(PetscBool *infoEnabled, PetscBool *classesSet, PetscBool *exclude, PetscBool *locked, PetscInfoCommFlag *commSelfFlag)
    256: {
    258:   if (infoEnabled)  *infoEnabled  = PetscLogPrintInfo;
    259:   if (classesSet)   *classesSet   = PetscInfoClassesSet;
    260:   if (exclude)      *exclude      = PetscInfoInvertClasses;
    261:   if (locked)       *locked       = PetscInfoClassesLocked;
    262:   if (commSelfFlag) *commSelfFlag = PetscInfoCommFilter;
    263:   return(0);
    264: }

    266: /*@C
    267:     PetscInfoProcessClass - Activates or deactivates a class based on the filtering status of PetscInfo()

    269:     Not Collective

    271:     Input Parameters:
    272: +   classname - Name of the class to activate/deactivate PetscInfo() for
    273: .   numClassID - Number of entries in classIDs
    274: -   classIDs - Array containing all of the PetscClassids associated with classname

    276:     Level: developer

    278: .seealso: PetscInfo(), PetscInfoActivateClass(), PetscInfoDeactivateClass(), PetscInfoSetFromOptions()
    279: @*/
    280: PetscErrorCode PetscInfoProcessClass(const char classname[], PetscInt numClassID, PetscClassId classIDs[])
    281: {
    282:   PetscInt        i;
    283:   PetscBool       enabled, exclude, found, opt, pkg;
    284:   char            logList[256];
    285:   PetscErrorCode  ierr;

    289:   PetscInfoGetInfo(&enabled, NULL, &exclude, NULL, NULL);
    290:   /* -info_exclude is DEPRECATED */
    291:   PetscOptionsGetString(NULL,NULL,"-info_exclude",logList,sizeof(logList),&opt);
    292:   if (opt) {
    293:     PetscStrInList(classname,logList,',',&pkg);
    294:     if (pkg) {
    295:       for (i = 0; i < numClassID; ++i) {
    296:         PetscInfoDeactivateClass(classIDs[i]);
    297:       }
    298:     }
    299:   }
    300:   PetscInfoGetClass(classname, &found);
    301:   if ((found && exclude) || (!found && !exclude)) {
    302:     if (PetscInfoNumClasses > 0) {
    303:       /* Check if -info was called empty */
    304:       for (i = 0; i < numClassID; ++i) {
    305:         PetscInfoDeactivateClass(classIDs[i]);
    306:       }
    307:     }
    308:   } else {
    309:     for (i = 0; i < numClassID; ++i) {
    310:       PetscInfoActivateClass(classIDs[i]);
    311:     }
    312:   }
    313:   return(0);
    314: }

    316: /*@
    317:     PetscInfoSetFilterCommSelf - Sets PetscInfoCommFlag enum to determine communicator filtering for PetscInfo()

    319:     Not Collective

    321:     Input Parameter:
    322: .   commSelfFlag - Enum value indicating method with which to filter PetscInfo() based on the size of the communicator of the object calling PetscInfo()

    324:     Level: advanced

    326: .seealso: PetscInfo(), PetscInfoGetInfo()
    327: @*/
    328: PetscErrorCode PetscInfoSetFilterCommSelf(PetscInfoCommFlag commSelfFlag)
    329: {
    331:   PetscInfoCommFilter = commSelfFlag;
    332:   return(0);
    333: }

    335: /*@
    336:     PetscInfoSetFromOptions - Configure PetscInfo() using command line options, enabling or disabling various calls to PetscInfo()

    338:     Not Collective

    340:     Input Parameter:
    341: .   options - Options database, use NULL for default global database

    343:     Options Database Keys:
    344: .   -info [filename][:[~]<list,of,classnames>[:[~]self]] - specify which informative messages are printed, See PetscInfo().

    346:     Notes:
    347:     This function is called automatically during PetscInitialize() so users usually do not need to call it themselves.

    349:     Level: advanced

    351: .seealso: PetscInfo(), PetscInfoAllow(), PetscInfoSetFile(), PetscInfoSetClasses(), PetscInfoSetFilterCommSelf(), PetscInfoDestroy()
    352: @*/
    353: PetscErrorCode PetscInfoSetFromOptions(PetscOptions options)
    354: {
    355:   char               optstring[PETSC_MAX_PATH_LEN], *loc0_ = NULL, *loc1_ = NULL, *loc2_ = NULL;
    356:   char               **loc1_array = NULL;
    357:   PetscBool          set, loc1_invert = PETSC_FALSE, loc2_invert = PETSC_FALSE, foundSelf = PETSC_FALSE;
    358:   size_t             size_loc0_ = 0, size_loc1_ = 0, size_loc2_ = 0;
    359:   int                nLoc1_ = 0;
    360:   PetscInfoCommFlag  commSelfFlag = PETSC_INFO_COMM_ALL;
    361:   PetscErrorCode     ierr;

    364:   PetscOptionsDeprecated_Private(NULL,"-info_exclude", NULL, "3.13", "Use -info instead");
    365:   PetscOptionsGetString(options, NULL, "-info", optstring, sizeof(optstring), &set);
    366:   if (set) {
    367:     PetscInfoClassesSet = PETSC_TRUE;
    368:     PetscInfoAllow(PETSC_TRUE);
    369:     PetscStrallocpy(optstring,&loc0_);
    370:     PetscStrchr(loc0_,':',&loc1_);
    371:     if (loc1_) {
    372:       *loc1_++ = 0;
    373:       if (*loc1_ == '~') {
    374:         loc1_invert = PETSC_TRUE;
    375:         ++loc1_;
    376:       }
    377:       PetscStrchr(loc1_,':',&loc2_);
    378:     }
    379:     if (loc2_) {
    380:       *loc2_++ = 0;
    381:       if (*loc2_ == '~') {
    382:         loc2_invert = PETSC_TRUE;
    383:         ++loc2_;
    384:       }
    385:     }
    386:     PetscStrlen(loc0_, &size_loc0_);
    387:     PetscStrlen(loc1_, &size_loc1_);
    388:     PetscStrlen(loc2_, &size_loc2_);
    389:     if (size_loc1_) {
    390:       PetscStrtolower(loc1_);
    391:       PetscStrToArray(loc1_, ',', &nLoc1_, &loc1_array);
    392:     }
    393:     if (size_loc2_) {
    394:       PetscStrtolower(loc2_);
    395:       PetscStrcmp("self", loc2_, &foundSelf);
    396:       if (foundSelf) {
    397:         if (loc2_invert) {
    398:           commSelfFlag = PETSC_INFO_COMM_NO_SELF;
    399:         } else {
    400:           commSelfFlag = PETSC_INFO_COMM_ONLY_SELF;
    401:         }
    402:       }
    403:     }
    404:     PetscInfoSetFile(size_loc0_ ? loc0_ : NULL, "w");
    405:     PetscInfoSetClasses(loc1_invert, (PetscInt) nLoc1_, (const char *const *) loc1_array);
    406:     PetscInfoSetFilterCommSelf(commSelfFlag);
    407:     PetscStrToArrayDestroy(nLoc1_, loc1_array);
    408:     PetscFree(loc0_);
    409:   }
    410:   return(0);
    411: }

    413: /*@
    414:   PetscInfoDestroy - Destroys and resets internal PetscInfo() data structures.

    416:   Not Collective

    418:   Notes:
    419:   This is automatically called in PetscFinalize(). Useful for changing filters mid-program, or culling subsequent
    420:   PetscInfo() calls down the line.

    422:   Level: developer

    424: .seealso: PetscInfo(), PetscInfoSetFromOptions()
    425: @*/
    426: PetscErrorCode PetscInfoDestroy(void)
    427: {
    428:   PetscErrorCode  ierr;
    429:   int             err;
    430:   size_t          i;

    433:   PetscInfoAllow(PETSC_FALSE);
    434:   PetscStrNArrayDestroy(PetscInfoNumClasses, &PetscInfoClassnames);
    435:   err  = fflush(PetscInfoFile);
    436:   if (err) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SYS,"fflush() failed on file");
    437:   if (PetscInfoFilename) {
    438:     PetscFClose(MPI_COMM_SELF, PetscInfoFile);
    439:   }
    440:   PetscFree(PetscInfoFilename);
    441:   for (i=0; i<sizeof(PetscInfoFlags)/sizeof(PetscInfoFlags[0]); i++) PetscInfoFlags[i] = 1;
    442:   PetscInfoClassesLocked = PETSC_FALSE;
    443:   PetscInfoInvertClasses = PETSC_FALSE;
    444:   PetscInfoClassesSet = PETSC_FALSE;
    445:   PetscInfoNumClasses = -1;
    446:   PetscInfoCommFilter = PETSC_INFO_COMM_ALL;
    447:   return(0);
    448: }

    450: /*@
    451:   PetscInfoDeactivateClass - Deactivates PetscInfo() messages for a PETSc object class.

    453:   Not Collective

    455:   Input Parameter:
    456: . classid - The object class,  e.g., MAT_CLASSID, SNES_CLASSID, etc.

    458:   Notes:
    459:   One can pass 0 to deactivate all messages that are not associated with an object.

    461:   Level: developer

    463: .seealso: PetscInfoActivateClass(), PetscInfo(), PetscInfoAllow(), PetscInfoSetFromOptions()
    464: @*/
    465: PetscErrorCode  PetscInfoDeactivateClass(PetscClassId classid)
    466: {
    468:   if (!classid) classid = PETSC_SMALLEST_CLASSID;
    469:   PetscInfoFlags[classid - PETSC_SMALLEST_CLASSID] = 0;
    470:   return(0);
    471: }

    473: /*@
    474:   PetscInfoActivateClass - Activates PetscInfo() messages for a PETSc object class.

    476:   Not Collective

    478:   Input Parameter:
    479: . classid - The object class, e.g., MAT_CLASSID, SNES_CLASSID, etc.

    481:   Notes:
    482:   One can pass 0 to activate all messages that are not associated with an object.

    484:   Level: developer

    486: .seealso: PetscInfoDeactivateClass(), PetscInfo(), PetscInfoAllow(), PetscInfoSetFromOptions()
    487: @*/
    488: PetscErrorCode  PetscInfoActivateClass(PetscClassId classid)
    489: {
    491:   if (!classid) classid = PETSC_SMALLEST_CLASSID;
    492:   PetscInfoFlags[classid - PETSC_SMALLEST_CLASSID] = 1;
    493:   return(0);
    494: }

    496: /*
    497:    If the option -history was used, then all printed PetscInfo()
    498:   messages are also printed to the history file, called by default
    499:   .petschistory in ones home directory.
    500: */
    501: PETSC_INTERN FILE *petsc_history;

    503: /*MC
    504:     PetscInfo - Logs informative data

    506:    Synopsis:
    507: #include <petscsys.h>
    508:        PetscErrorCode PetscInfo(PetscObject obj, const char message[])
    509:        PetscErrorCode PetscInfo1(PetscObject obj, const char formatmessage[],arg1)
    510:        PetscErrorCode PetscInfo2(PetscObject obj, const char formatmessage[],arg1,arg2)
    511:        ...

    513:     Collective on obj

    515:     Input Parameter:
    516: +   obj - object most closely associated with the logging statement or NULL
    517: .   message - logging message
    518: .   formatmessage - logging message using standard "printf" format
    519: -   arg1, arg2, ... - arguments of the format

    521:     Notes:
    522:     PetscInfo() prints only from the first processor in the communicator of obj.
    523:     If obj is NULL, the PETSC_COMM_SELF communicator is used, i.e. every rank of PETSC_COMM_WORLD prints the message.

    525:     Extent of the printed messages can be controlled using the option database key -info as follows.

    527: $   -info [filename][:[~]<list,of,classnames>[:[~]self]]

    529:     No filename means standard output PETSC_STDOUT is used.

    531:     The optional <list,of,classnames> is a comma separated list of enabled classes, e.g. vec,mat,ksp.
    532:     If this list is not specified, all classes are enabled.
    533:     Prepending the list with ~ means inverted selection, i.e. all classes except the listed are enabled.
    534:     A special classname sys relates to PetscInfo() with obj being NULL.

    536:     The optional self keyword specifies that PetscInfo() is enabled only for communicator size = 1 (e.g. PETSC_COMM_SELF), i.e. only PetscInfo() calls which print from every rank of PETSC_COMM_WORLD are enabled.
    537:     By contrast, ~self means that PetscInfo() is enabled only for communicator size > 1 (e.g. PETSC_COMM_WORLD), i.e. those PetscInfo() calls which print from every rank of PETSC_COMM_WORLD are disabled.

    539:     All classname/self matching is case insensitive. Filename is case sensitive.

    541:     Example of Usage:
    542: $     Mat A;
    543: $     PetscInt alpha;
    544: $     ...
    545: $     PetscInfo1(A,"Matrix uses parameter alpha=%D\n",alpha);

    547:     Options Examples:
    548:     Each call of the form
    549: $     PetscInfo(obj, msg);
    550: $     PetscInfo1(obj, msg, arg1);
    551: $     PetscInfo2(obj, msg, arg1, arg2);
    552:     is evaluated as follows.
    553: $     -info or -info :: prints msg to PETSC_STDOUT, for any obj regardless class or communicator
    554: $     -info :mat:self prints msg to PETSC_STDOUT only if class of obj is Mat, and its communicator has size = 1
    555: $     -info myInfoFileName:~vec:~self prints msg to file named myInfoFileName, only if the obj's class is NULL or other than Vec, and obj's communicator has size > 1
    556: $     -info :sys prints to PETSC_STDOUT only if obj is NULL
    557:     Note that
    558: $     -info :sys:~self
    559:     deactivates all info messages because sys means obj = NULL which implies PETSC_COMM_SELF but ~self filters out everything on PETSC_COMM_SELF.

    561:     Fortran Note:
    562:     This function does not take the obj argument, there is only the PetscInfo()
    563:      version, not PetscInfo1() etc.

    565:     Level: intermediate

    567: .seealso: PetscInfoAllow(), PetscInfoSetFromOptions()
    568: M*/
    569: PetscErrorCode  PetscInfo_Private(const char func[],PetscObject obj, const char message[], ...)
    570: {
    571:   va_list        Argp;
    572:   PetscMPIInt    rank = 0,urank,size = 1;
    573:   PetscClassId   classid;
    574:   PetscBool      enabled = PETSC_FALSE, oldflag;
    575:   char           string[8*1024];
    577:   size_t         fullLength,len;
    578:   int            err;

    582:   classid = obj ? obj->classid : PETSC_SMALLEST_CLASSID;
    583:   PetscInfoEnabled(classid, &enabled);
    584:   if (!enabled) return(0);
    586:   if (obj) {
    587:     MPI_Comm_rank(obj->comm, &rank);
    588:     MPI_Comm_size(obj->comm, &size);
    589:   }
    590:   /* rank > 0 always jumps out */
    591:   if (rank) return(0);
    592:   if (!PetscInfoCommFilter && (size < 2)) {
    593:     /* If no self printing is allowed, and size too small get out */
    594:     return(0);
    595:   } else if ((PetscInfoCommFilter == PETSC_INFO_COMM_ONLY_SELF) && (size > 1)) {
    596:     /* If ONLY self printing, and size too big, get out */
    597:     return(0);
    598:   }
    599:   /* Mute info messages within this function */
    600:   oldflag = PetscLogPrintInfo; PetscLogPrintInfo = PETSC_FALSE;
    601:   MPI_Comm_rank(MPI_COMM_WORLD, &urank);
    602:   va_start(Argp, message);
    603:   sprintf(string, "[%d] %s(): ",urank,func);
    604:   PetscStrlen(string, &len);
    605:   PetscVSNPrintf(string+len, 8*1024-len,message,&fullLength, Argp);
    606:   PetscFPrintf(PETSC_COMM_SELF,PetscInfoFile, "%s", string);
    607:   err  = fflush(PetscInfoFile);
    608:   if (err) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SYS,"fflush() failed on file");
    609:   if (petsc_history) {
    610:     va_start(Argp, message);
    611:     (*PetscVFPrintf)(petsc_history, message, Argp);
    612:   }
    613:   va_end(Argp);
    614:   PetscLogPrintInfo = oldflag;
    615:   return(0);
    616: }