/* * Copyright (C) 1998 NCSA * All rights reserved. * * Programmer: * January 30, 1998 * * Purpose: This is the MPI2 I/O subclass of H5Flow. * * Problems and limitations: * * H5F_mpio_access * - Since there is no "access" function for MPI-IO files * we open (i.e., MPI_File_open) the file to see if it exists * and to infer the access flags. If the file is opened, * we close it without reading or writing it. * - It is not possible within MPI-IO to determine whether or not * the names "file1" and "file2" refer to the same physical file * (at least not without writing one and reading the other). * So we do what H5F_core_open() does: return a bogus device * number and a unique inode number. * This has the side effect that calling H5Fopen() twice * with the same name really does open the file twice * and the two handles don't communicate with each other, * resulting in trashing the file. It also runs the (very * small) risk of having two unrelated names be seen as the * same file. * * H5F_mpio_open * - "unique" key treated same as in H5F_mpio_access * * H5F_mpio_read & H5F_mpio_write * - Eventually these should choose collective or independent i/o * based on a parameter that is passed down to it from H5Dwrite, * rather than the access_parms (which are fixed at the open). * * H5F_mpio_read * - One implementation of MPI/MPI-IO causes MPI_Get_count * to return (incorrectly) a negative count. * I added code to detect this, and a kludge to pretend * that the number of bytes read is always equal to the number * requested. This kluge is activated by #ifdef MPI_KLUGE0202. * */ #include #include #include #include #include #include #ifndef HAVE_PARALLEL /* * The H5F_mpio_xxxx functions are for parallel I/O only and are * valid only when HAVE_PARALLEL is #defined. This empty #ifndef * body is used to allow this source file be included in the serial * distribution. * Some compilers/linkers may complain about "empty" object file. * If that happens, uncomment the following statement to pacify * them. */ /* const hbool_t H5F_mpio_avail = FALSE; */ #else /* HAVE_PARALLEL */ #include #include #define PABLO_MASK H5F_mpio static hbool_t interface_initialize_g = FALSE; /* rky??? */ #define INTERFACE_INIT NULL /* Global var to allow elimination of redundant metadata writes * to be controlled by the value of an environment variable. */ hbool_t H5_mpi_1_metawrite_g = FALSE; #define H5F_MPIO_DEV 0xfffe /*pseudo dev for MPI-IO until we fix things */ /* Make sure this differs from H5F_CORE_DEV */ #ifdef H5Fmpio_DEBUG /* Flags to control debug actions in H5Fmpio. * Meant to be indexed by characters. * * 'c' show result of MPI_Get_count after read * 'r' show read offset and size * 't' trace function entry and exit * 'w' show write offset and size */ static int H5F_mpio_Debug[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }; #endif static hbool_t H5F_mpio_access(const char *name, const H5F_access_t *access_parms, int mode, H5F_search_t *key/*out*/); static H5F_low_t *H5F_mpio_open(const char *name, const H5F_access_t *access_parms, uintn flags, H5F_search_t *key/*out*/); static herr_t H5F_mpio_close(H5F_low_t *lf, const H5F_access_t *access_parms); static herr_t H5F_mpio_read(H5F_low_t *lf, H5F_access_t *access_parms, const H5D_transfer_t xfer_mode, const haddr_t *addr, size_t size, uint8 *buf/*out*/); hbool_t H5F_mpio_tas_allsame(H5F_low_t *lf, hbool_t newval ); static herr_t H5F_mpio_write(H5F_low_t *lf, H5F_access_t *access_parms, const H5D_transfer_t xfer_mode, const haddr_t *addr, size_t size, const uint8 *buf); static herr_t H5F_mpio_flush(H5F_low_t *lf, const H5F_access_t *access_parms); static herr_t H5F_MPIOff_to_haddr(MPI_Offset mpi_off, haddr_t *addr); static herr_t H5F_haddr_to_MPIOff(haddr_t addr, MPI_Offset *mpi_off); const H5F_low_class_t H5F_LOW_MPIO_g[1] = {{ H5F_mpio_access, /*access method */ H5F_mpio_open, /*open method */ H5F_mpio_close, /*close method */ /* rky 980816 * this is ugly, but removing the const modifier from access_parms * in the parameter list of the write function in H5F_low_class_t * would propagate to a lot of functions that don't change that param */ (int(*)(struct H5F_low_t *lf, const H5F_access_t *access_parms, const H5D_transfer_t xfer_mode, const haddr_t *addr, size_t size, uint8 *buf)) H5F_mpio_read, /*read method */ /* rky 980816 * this is ugly, but removing the const modifier from access_parms * in the parameter list of the write function in H5F_low_class_t * would propagate to a lot of functions that don't change that param */ (int(*)(struct H5F_low_t *lf, const H5F_access_t *access_parms, const H5D_transfer_t xfer_mode, const haddr_t *addr, size_t size, const uint8 *buf)) H5F_mpio_write, /*write method */ H5F_mpio_flush, /*flush method */ NULL, /*extend method */ NULL, /*alloc method */ }}; ino_t mpio_inode_num = 0; /* fake "inode" number */ /*------------------------------------------------------------------------- * Function: H5F_mpio_access * * Purpose: Determines if an MPI-IO file can be accessed in a particular * way. The access modes for a file are the same as those of * access(2), namely * * F_OK: determines if the MPI-IO file exists * (in fact, we can only determine that the file can be * opened for reading or writing, or neither) * * R_OK: determines if the MPI-IO file is readable * * W_OK: determines if the MPI-IO file is writable. * * Warning: It is not possible within MPI-IO to determine whether or not * the names "file1" and "file2" refer to the same physical fileC * (at least not without writing one and reading the other). * So we do what H5F_core_open() does: return a bogus device number * and a unique inode number. * This has the side effect that calling H5Fopen() twice * with the same name really does open the file twice * and the two handles don't communicate with each other, * resulting in trashing the file. It also runs the (very small) * risk of having two unrelated names be seen as the same file. * * Must call this routine collectively since it collectively * calls MPI_File_open with the communicator in access_parms. * * Return: Success: TRUE or FALSE. If TRUE, then KEY is * initialized with data that makes this file * unique (same value as H5F_low_open). * * Failure: FAIL, KEY is undefined. * * Programmer: * January 30, 1998 * * Modifications: * * Robb Matzke, 18 Feb 1998 * Added the ACCESS_PARMS argument. * * June 9, 1998 Albert Cheng * Instead of opening the file with COMM_SELF (which results in * racing condition in routine that calls it), open it with the * communicator in access_parms. (This assumes this access call * must be called collectively.) * *------------------------------------------------------------------------- */ static hbool_t H5F_mpio_access(const char *name, const H5F_access_t *access_parms, int mode, H5F_search_t *key/*out*/) { hbool_t ret_val = FALSE; MPI_File fh; int mpierr; int mpi_mode; FUNC_ENTER(H5F_mpio_access, FAIL); #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) fprintf(stdout, "Entering H5F_mpio_access name=%s mode=0x%x\n", name, mode ); #endif assert(access_parms->driver == H5F_LOW_MPIO); /* The only way to get this info in MPI-IO is to try to open the file */ /* (though particular implementations of MPI-IO may allow other ways) */ switch (mode) { case F_OK: mpi_mode = MPI_MODE_RDONLY; /* to see if it exists, first try to open for read */ break; case R_OK: mpi_mode = MPI_MODE_RDONLY; break; case W_OK: mpi_mode = MPI_MODE_WRONLY; break; default: HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid mode parameter"); } /* (char*) name is okay since MPI_File_open will not change it. */ mpierr = MPI_File_open(access_parms->u.mpio.comm, (char*) name, mpi_mode, access_parms->u.mpio.info, &fh ); if (MPI_SUCCESS == mpierr) { mpierr = MPI_File_close( &fh ); if (MPI_SUCCESS != mpierr) HRETURN_ERROR(H5E_IO, H5E_MPI, FAIL, "MPI_File_close failed"); ret_val = TRUE; } else if (mode == F_OK) { /* to see if it exists, this time try to open for write */ mpierr = MPI_File_open(access_parms->u.mpio.comm, (char*)name, MPI_MODE_WRONLY, access_parms->u.mpio.info, &fh ); if (MPI_SUCCESS == mpierr) { mpierr = MPI_File_close( &fh ); if (MPI_SUCCESS != mpierr) HRETURN_ERROR(H5E_IO, H5E_MPI, FAIL, "MPI_File_close failed"); ret_val = TRUE; } } /* if the file exists, provide its (not really) unique key */ if ((ret_val==TRUE) && key) { key->dev = H5F_MPIO_DEV; key->ino = mpio_inode_num++; } #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) { if (key && (ret_val==TRUE)) fprintf(stdout, "Leaving H5F_mpio_access ret_val=%d key->dev=0x%x key->ino=%d\n", ret_val, key->dev, key->ino ); else fprintf(stdout, "Leaving H5F_mpio_access ret_val=%d\n", ret_val ); } #endif FUNC_LEAVE(ret_val); } /*------------------------------------------------------------------------- * Function: H5F_mpio_open * * Purpose: Opens a file with name NAME. The FLAGS are a bit field with * the possible values defined in H5F_low_open(). * * Errors: * IO CANTOPENFILE MPI_File_open failed. * IO CANTOPENFILE MPI_File_get_size failed. * IO CANTOPENFILE MPI_File_set_size failed (for truncate). * * Return: Success: Low-level file pointer * * Failure: NULL * * Programmer: * January 30, 1998 * * Modifications: * * Robb Matzke, 18 Feb 1998 * Added the ACCESS_PARMS argument. Moved some error checking here from * elsewhere. * * rky, 11 Jun 1998 * Added H5F_mpio_Debug debug flags controlled by MPI_Info. * * rky 980828 Init flag controlling redundant metadata writes to disk. *------------------------------------------------------------------------- */ static H5F_low_t * H5F_mpio_open(const char *name, const H5F_access_t *access_parms, uintn flags, H5F_search_t *key/*out*/) { H5F_low_t *lf = NULL; MPI_File fh; int mpi_amode; char mpierrmsg[MPI_MAX_ERROR_STRING]; int mpierr, msglen; MPI_Offset size; FUNC_ENTER(H5F_mpio_open, NULL); #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) fprintf(stdout, "Entering H5F_mpio_open name=%s flags=0x%x\n", name, flags ); #endif /* convert HDF5 flags to MPI-IO flags */ /* some combinations are illegal; let MPI-IO figure it out */ mpi_amode = (flags&H5F_ACC_RDWR) ? MPI_MODE_RDWR : MPI_MODE_RDONLY; if (flags&H5F_ACC_CREAT) mpi_amode |= MPI_MODE_CREATE; if (flags&H5F_ACC_EXCL) mpi_amode |= MPI_MODE_EXCL; #ifdef H5Fmpio_DEBUG /* Check for debug commands in the info parameter */ { char debug_str[128]; int infoerr, flag, i; if (access_parms->u.mpio.info) { infoerr = MPI_Info_get( access_parms->u.mpio.info, H5F_MPIO_DEBUG_KEY, 127, debug_str, &flag ); if (flag) { fprintf(stdout, "H5Fmpio debug flags=%s\n", debug_str ); for (i=0; debug_str[i]/*end of string*/ && i<128/*just in case*/; ++i) { H5F_mpio_Debug[(int)debug_str[i]] = 1; } } } } #endif mpierr = MPI_File_open(access_parms->u.mpio.comm, (char*)name, mpi_amode, access_parms->u.mpio.info, &fh); if (MPI_SUCCESS != mpierr) { MPI_Error_string( mpierr, mpierrmsg, &msglen ); HRETURN_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, mpierrmsg ); } /* truncate the file, if requested */ if (flags&H5F_ACC_TRUNC) { mpierr = MPI_File_set_size( fh, (MPI_Offset)0 ); if (MPI_SUCCESS != mpierr) { MPI_File_close( &fh ); HRETURN_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "MPI_File_set_size failed trying to truncate file" ); } } /* Build the return value */ if (NULL==(lf = H5MM_calloc(sizeof(H5F_low_t)))) { HRETURN_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed"); } lf->u.mpio.f = fh; H5F_mpio_tas_allsame( lf, FALSE ); /* initialize */ H5F_addr_reset(&(lf->eof)); mpierr = MPI_File_get_size( fh, &size ); if (MPI_SUCCESS != mpierr) { MPI_File_close( &(lf->u.mpio.f) ); MPI_Error_string( mpierr, mpierrmsg, &msglen ); HRETURN_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, mpierrmsg ); } else { haddr_t new_eof; if (SUCCEED != H5F_MPIOff_to_haddr( size, &new_eof )) { MPI_File_close( &(lf->u.mpio.f) ); HRETURN_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "couldn't convert size to haddr_t" ); } H5F_low_seteof( lf, &new_eof ); } /* The unique key */ if (key) { key->dev = H5F_MPIO_DEV; key->ino = mpio_inode_num++; } #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) { if (key) fprintf(stdout, "Leaving H5F_mpio_open key->dev=0x%x key->ino=%d\n", key->dev, key->ino ); else fprintf(stdout, "Leaving H5F_mpio_open\n" ); } #endif FUNC_LEAVE(lf); } /*------------------------------------------------------------------------- * Function: H5F_mpio_close * * Purpose: Closes a file. * * Errors: * IO CLOSEERROR Fclose failed. * * Return: Success: SUCCEED * * Failure: FAIL * * Programmer: * January 30, 1998 * * Modifications: * * Robb Matzke, 18 Feb 1998 * Added the ACCESS_PARMS argument. * *------------------------------------------------------------------------- */ static herr_t H5F_mpio_close(H5F_low_t *lf, const H5F_access_t __unused__ *access_parms) { int mpierr; char mpierrmsg[MPI_MAX_ERROR_STRING]; int msglen; FUNC_ENTER(H5F_mpio_close, FAIL); #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) fprintf(stdout, "Entering H5F_mpio_close\n" ); #endif mpierr = MPI_File_close( &(lf->u.mpio.f) ); /* MPI_File_close sets lf->u.mpio.f to MPI_FILE_NULL */ if (MPI_SUCCESS != mpierr) { MPI_Error_string( mpierr, mpierrmsg, &msglen ); HRETURN_ERROR(H5E_IO, H5E_CLOSEERROR, FAIL, mpierrmsg ); } #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) fprintf(stdout, "Leaving H5F_mpio_close\n" ); #endif FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5F_mpio_read * * Purpose: Depending on a field in access params, either: * - Writes SIZE bytes from the beginning of BUF into file LF * at file address ADDR. * - Reads SIZE bytes beginning at address ADDR in file LF * and places them in buffer BUF. * - Uses the (potentially complex) file and buffer types * to effect the transfer. * This can allow MPI to coalesce requests from * different processes (collective or independent). * * Reading past the end of the MPI file * returns zeros instead of failing. * * Errors: * IO READERROR MPI_File_read_at failed. * IO READERROR MPI_Get_count failed * * Return: Success: SUCCEED * Failure: FAIL * (use_types and old_use_types in the access params are altered) * * Programmer: rky 980130 * * Modifications: * * Robb Matzke, 18 Feb 1998 * Added the ACCESS_PARMS argument. * * rky, 10 Apr 1998 * Call independent or collective MPI read, based on ACCESS_PARMS. * * Albert Cheng, June 1, 1998 * Added xfer_mode to control independent or collective MPI read. * * rky 980816 * Use btype, ftype, and disp from access parms. * The guts of H5F_mpio_read and H5F_mpio_write * should be replaced by a single dual-purpose routine. * *------------------------------------------------------------------------- */ static herr_t H5F_mpio_read(H5F_low_t *lf, H5F_access_t *access_parms, const H5D_transfer_t xfer_mode, const haddr_t *addr, size_t size, uint8 *buf/*out*/) { MPI_Offset mpi_off, mpi_disp; MPI_Status mpi_stat; MPI_Datatype buf_type, file_type; int mpierr, msglen, size_i, bytes_read, n; int use_types_this_time, used_types_last_time; char mpierrmsg[MPI_MAX_ERROR_STRING]; FUNC_ENTER(H5F_mpio_read, FAIL); #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) fprintf(stdout, "Entering H5F_mpio_read\n" ); #endif /* some numeric conversions */ if (SUCCEED != H5F_haddr_to_MPIOff( *addr, &mpi_off )) { HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL, "couldn't convert addr to MPIOffset" ); } size_i = (int)size; if (size_i != size) { /* check type conversion */ HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL, "couldn't convert size to int" ); } #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'r']) fprintf(stdout, "in H5F_mpio_read mpi_off=%lld size_i=%d\n", mpi_off, size_i ); #endif /* Set up for a fancy xfer using complex types, or single byte block. * We wouldn't need to rely on the use_types field * if MPI semantics allowed us to test that btype=ftype=MPI_BYTE * (or even MPI_TYPE_NULL, which could mean "use MPI_BYTE" by convention). */ use_types_this_time = access_parms->u.mpio.use_types; if (use_types_this_time) { /* prepare for a full-blown xfer using btype, ftype, and disp */ buf_type = access_parms->u.mpio.btype; file_type = access_parms->u.mpio.ftype; if (SUCCEED != H5F_haddr_to_MPIOff( access_parms->u.mpio.disp, &mpi_disp)) { HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL, "couldn't convert addr to MPIOffset" ); } } else { /* Prepare for a simple xfer of a contiguous block of bytes. * The btype, ftype, and disp fields are not used. */ buf_type = MPI_BYTE; file_type = MPI_BYTE; mpi_disp = 0; /* mpi_off is sufficient */ } /* Don't bother to reset the view if we're not using the types this time, * and did we didn't use them last time either. */ used_types_last_time = access_parms->u.mpio.old_use_types; if (used_types_last_time /* change to new ftype or MPI_BYTE */ || use_types_this_time) /* almost certainly a different ftype */ { mpierr = MPI_File_set_view( lf->u.mpio.f, mpi_disp, MPI_BYTE, file_type, "native", access_parms->u.mpio.info ); if (MPI_SUCCESS != mpierr) { MPI_Error_string( mpierr, mpierrmsg, &msglen ); HRETURN_ERROR(H5E_IO, H5E_MPI, FAIL, mpierrmsg ); } } /* We always set the use_types flag to 0 because the * default is not to use types next time, * unless someone explicitly requests it by setting this flag to !=0. */ access_parms->u.mpio.old_use_types = use_types_this_time; access_parms->u.mpio.use_types = 0; /* Read the data. */ switch (xfer_mode){ case H5D_XFER_INDEPENDENT: case H5D_XFER_DFLT: mpierr = MPI_File_read_at ( lf->u.mpio.f, mpi_off, (void*) buf, size_i, buf_type, &mpi_stat ); break; case H5D_XFER_COLLECTIVE: #ifdef H5Fmpio_DEBUG printf("%s: using MPIO collective mode\n", FUNC); #endif mpierr = MPI_File_read_at_all ( lf->u.mpio.f, mpi_off, (void*) buf, size_i, buf_type, &mpi_stat ); break; default: HRETURN_ERROR(H5E_IO, H5E_BADVALUE, FAIL, "invalid file access mode"); } if (MPI_SUCCESS != mpierr) { MPI_Error_string( mpierr, mpierrmsg, &msglen ); HRETURN_ERROR(H5E_IO, H5E_READERROR, FAIL, mpierrmsg ); } /* How many bytes were actually read? */ mpierr = MPI_Get_count( &mpi_stat, MPI_BYTE, &bytes_read ); #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'c']) fprintf(stdout, "In H5F_mpio_read after Get_count size_i=%d bytes_read=%d\n", size_i, bytes_read ); #endif if (MPI_SUCCESS != mpierr) { MPI_Error_string( mpierr, mpierrmsg, &msglen ); HRETURN_ERROR(H5E_IO, H5E_MPI, FAIL, mpierrmsg ); } #define MPI_KLUGE0202 #ifdef MPI_KLUGE0202 /* KLUGE rky 980202 MPI_Get_count incorrectly returns negative count; fake a complete read */ bytes_read = size_i; /* KLUGE rky 980202 */ #endif if ((bytes_read<0) || (bytes_read > size_i)) { HRETURN_ERROR(H5E_IO, H5E_READERROR, FAIL, "MPI_Get_count returned invalid count" ); } /* beyond end of file, pretend we're reading zeroes */ if (use_types_this_time) { /* BUG rky 980816 Not implemented yet. How to do it??? */ HRETURN_ERROR(H5E_IO, H5E_UNSUPPORTED, FAIL, "haven't implemented reading zeroes beyond end of file" ); } else { /* BUG??? rky 980816 * This gives us zeroes beyond end of physical MPI file. * What about reading past logical end of HDF5 file??? */ if ((n=(size_i-bytes_read)) > 0) { HDmemset( buf+bytes_read, 0, (size_t)n ); } } #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) fprintf(stdout, "Leaving H5F_mpio_read\n" ); #endif FUNC_LEAVE(SUCCEED); } /* H5F_mpio_read */ /*------------------------------------------------------------------------- * Function: H5F_mpio_tas_allsame * * Purpose: Test and set the allsame parameter. * * Errors: * * Return: Success: the old value of the allsame flag * * Failure: assert fails if access_parms is NULL. * * Programmer: rky 980828 * * Modifications: * *------------------------------------------------------------------------- */ hbool_t H5F_mpio_tas_allsame(H5F_low_t *lf, hbool_t newval ) { hbool_t oldval; FUNC_ENTER(H5F_mpio_tas_allsame, FALSE); #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) fprintf(stdout, "Entering H5F_mpio_tas_allsame, newval=%d\n", newval ); #endif assert(lf); oldval = lf->u.mpio.allsame; lf->u.mpio.allsame = newval; #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) fprintf(stdout, "Leaving H5F_mpio_tas_allsame, oldval=%d\n", oldval ); #endif FUNC_LEAVE(oldval); } /*------------------------------------------------------------------------- * Function: H5F_mpio_write * * Purpose: Depending on a field in access params, either: * - Writes SIZE bytes from the beginning of BUF into file LF * at file address ADDR. * - Uses the (potentially complex) file and buffer types * to effect the transfer. * This can allow MPI to coalesce requests from * different processes (collective or independent). * * rky 980828 * If the allsame flag is set, we assume that all the procs * in the relevant MPI communicator will write identical data * at identical offsets in the file, so only proc 0 will write, * and all other procs will wait for p0 to finish. * This is useful for writing metadata, for example. * Note that we don't _check_ that the data is identical. * ALso, the mechanism we use to eliminate the redundant writes * is by requiring a call to H5F_mpio_tas_allsame before the write, * which is rather klugey. * Would it be better to pass a parameter to low-level writes * like H5F_block_write and H5F_low_write, instead? Or...??? * Also, when I created this mechanism I wanted to minimize * the difference in behavior between the old way of doing things * (i.e., all procs write) and the new way, so the writes are * eliminated at the very lowest level, here in H5F_mpio_write. * It may be better to rethink that, and short-circuit the writes * at a higher level (e.g., at the points in the code where * H5F_mpio_tas_allsame is called). * * Errors: * IO WRITEERROR MPI_File_write_at failed. * * Return: Success: SUCCEED * Failure: FAIL * (use_types and old_use_types in the access params are altered) * * Programmer: * January 30, 1998 * * Modifications: * * Robb Matzke, 18 Feb 1998 * Added the ACCESS_PARMS argument. * * rky, 10 Apr 1998 * Call independent or collective MPI write, based on ACCESS_PARMS. * * rky, 24 April * Removed redundant write from H5F_Mpio_write. * * Albert Cheng, June 1, 1998 * Added xfer_mode to control independent or collective MPI write. * * rky 980816 * Use btype, ftype, and disp from access parms. * The guts of H5F_mpio_read and H5F_mpio_write * should be replaced by a single dual-purpose routine. * * rky, 980828 * Added allsame parameter to make all but proc 0 skip the actual write. * *------------------------------------------------------------------------- */ static herr_t H5F_mpio_write(H5F_low_t *lf, H5F_access_t *access_parms, const H5D_transfer_t xfer_mode, const haddr_t *addr, size_t size, const uint8 *buf) { MPI_Offset mpi_off, mpi_disp; MPI_Status mpi_stat; MPI_Datatype buf_type, file_type; int mpierr, msglen, size_i, bytes_written, mpi_rank; int use_types_this_time, used_types_last_time; char mpierrmsg[MPI_MAX_ERROR_STRING]; hbool_t allsame; FUNC_ENTER(H5F_mpio_write, FAIL); #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) fprintf(stdout, "Entering H5F_mpio_write\n" ); #endif /* some numeric conversions */ if (SUCCEED != H5F_haddr_to_MPIOff( *addr, &mpi_off )) { HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL, "couldn't convert addr to MPIOffset" ); } if (SUCCEED!=H5F_haddr_to_MPIOff( access_parms->u.mpio.disp, &mpi_disp)) { HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL, "couldn't convert addr to MPIOffset" ); } size_i = (int)size; if (size_i != size) { /* check type conversion */ HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL, "couldn't convert size to int" ); } #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'w']) fprintf(stdout, "in H5F_mpio_write mpi_off=%lld size_i=%d\n", mpi_off, size_i ); #endif /* Only p0 will do the actual write if all procs in comm write same data */ allsame = H5F_mpio_tas_allsame( lf, FALSE ); if (allsame && H5_mpi_1_metawrite_g) { mpierr = MPI_Comm_rank( access_parms->u.mpio.comm, &mpi_rank ); if (mpierr != MPI_SUCCESS) HRETURN_ERROR(H5E_IO, H5E_MPI, FAIL, "MPI_Comm_rank failed" ); if (mpi_rank != 0) { #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'w']) { fprintf(stdout, " in H5F_mpio_write (write omitted)\n" ); } #endif goto done; /* skip the actual write */ } } /* Set up for a fancy xfer using complex types, or single byte block. * We wouldn't need to rely on the use_types field * if MPI semantics allowed us to test that btype=ftype=MPI_BYTE * (or even MPI_TYPE_NULL, which could mean "use MPI_BYTE" by convention). */ use_types_this_time = access_parms->u.mpio.use_types; if (use_types_this_time) { /* prepare for a full-blown xfer using btype, ftype, and disp */ buf_type = access_parms->u.mpio.btype; file_type = access_parms->u.mpio.ftype; if (SUCCEED != H5F_haddr_to_MPIOff( access_parms->u.mpio.disp, &mpi_disp)) { HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL, "couldn't convert addr to MPIOffset" ); } } else { /* Prepare for a simple xfer of a contiguous block of bytes. * The btype, ftype, and disp fields are not used. */ buf_type = MPI_BYTE; file_type = MPI_BYTE; mpi_disp = 0; /* mpi_off is sufficient */ } /* Don't bother to reset the view if we're not using the types this time, * and did we didn't use them last time either. */ used_types_last_time = access_parms->u.mpio.old_use_types; if (used_types_last_time /* change to new ftype or MPI_BYTE */ || use_types_this_time) /* almost certainly a different ftype */ { mpierr = MPI_File_set_view( lf->u.mpio.f, mpi_disp, MPI_BYTE, file_type, "native", access_parms->u.mpio.info ); if (MPI_SUCCESS != mpierr) { MPI_Error_string( mpierr, mpierrmsg, &msglen ); HRETURN_ERROR(H5E_IO, H5E_MPI, FAIL, mpierrmsg ); } } /* We always set the use_types flag to 0 because the * default is not to use types next time, * unless someone explicitly requests it by setting this flag to !=0. */ access_parms->u.mpio.old_use_types = use_types_this_time; access_parms->u.mpio.use_types = 0; /* Write the data. */ switch (xfer_mode){ case H5D_XFER_INDEPENDENT: case H5D_XFER_DFLT: mpierr = MPI_File_write_at ( lf->u.mpio.f, mpi_off, (void*) buf, size_i, buf_type, &mpi_stat ); break; case H5D_XFER_COLLECTIVE: #ifdef H5Fmpio_DEBUG printf("%s: using MPIO collective mode\n", FUNC); #endif mpierr = MPI_File_write_at_all( lf->u.mpio.f, mpi_off, (void*) buf, size_i, buf_type, &mpi_stat ); break; default: HRETURN_ERROR(H5E_IO, H5E_BADVALUE, FAIL, "invalid file access mode"); } if (MPI_SUCCESS != mpierr) { MPI_Error_string( mpierr, mpierrmsg, &msglen ); HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, mpierrmsg ); } /* How many bytes were actually written? */ mpierr = MPI_Get_count( &mpi_stat, MPI_BYTE, &bytes_written ); #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'c']) fprintf(stdout, "In H5F_mpio_write after Get_count size_i=%d bytes_written=%d\n", size_i, bytes_written ); #endif if (MPI_SUCCESS != mpierr) { MPI_Error_string( mpierr, mpierrmsg, &msglen ); HRETURN_ERROR(H5E_IO, H5E_MPI, FAIL, mpierrmsg ); } #define MPI_KLUGE0202 #ifdef MPI_KLUGE0202 /* KLUGE rky 980202 MPI_Get_count incorrectly returns negative count; fake a complete write */ bytes_written = size_i; /* KLUGE rky 980202 */ #endif if ((bytes_written<0) || (bytes_written > size_i)) { HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "MPI_Get_count returned invalid count" ); } done: #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) fprintf(stdout, "Leaving H5F_mpio_write\n" ); #endif FUNC_LEAVE(SUCCEED); } /* H5F_mpio_write */ /*------------------------------------------------------------------------- * Function: H5F_mpio_flush * * Purpose: Makes sure that all data is on disk. * * Errors: * IO WRITEERROR MPI_File_sync failed. * * Return: Success: SUCCEED * * Failure: FAIL * * Programmer: * January 30, 1998 * * Modifications: * * Robb Matzke, 18 Feb 1998 * Added the ACCESS_PARMS argument. * *------------------------------------------------------------------------- */ static herr_t H5F_mpio_flush(H5F_low_t *lf, const H5F_access_t __unused__ *access_parms) { int mpierr; char mpierrmsg[MPI_MAX_ERROR_STRING]; int msglen; FUNC_ENTER(H5F_mpio_flush, FAIL); #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) fprintf(stdout, "Entering H5F_mpio_flush\n" ); #endif mpierr = MPI_File_sync( lf->u.mpio.f ); if (MPI_SUCCESS != mpierr) { MPI_Error_string( mpierr, mpierrmsg, &msglen ); HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, mpierrmsg ); } #ifdef H5Fmpio_DEBUG if (H5F_mpio_Debug[(int)'t']) fprintf(stdout, "Leaving H5F_mpio_flush\n" ); #endif FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5F_MPIOff_to_haddr * * Purpose: Convert an MPI_Offset value to haddr_t. * * Problems and limitations: * * Return: Success: return value is SUCCEED * and the haddr_t contains the converted value * * Failure: return value is FAIL, the haddr_t is undefined * * Programmer: * January 30, 1998 * * Modifications: * *------------------------------------------------------------------------- */ static herr_t H5F_MPIOff_to_haddr( MPI_Offset mpi_off, haddr_t *addr ) { herr_t ret_val = FAIL; addr->offset = (uint64) mpi_off; if (addr->offset == mpi_off) ret_val = SUCCEED; return (ret_val); } /*------------------------------------------------------------------------- * Function: H5F_haddr_to_MPIOff * * Purpose: Convert an haddr_t value to MPI_Offset. * * Problems and limitations: * * Return: Success: return value is SUCCEED * and the MPIOffset contains the converted value * * Failure: return value is FAIL, the MPIOffset is undefined * * Programmer: * January 30, 1998 * * Modifications: * *------------------------------------------------------------------------- */ static herr_t H5F_haddr_to_MPIOff( haddr_t addr, MPI_Offset *mpi_off ) { herr_t ret_val = FAIL; *mpi_off = (MPI_Offset) addr.offset; if (*mpi_off == addr.offset) ret_val = SUCCEED; return (ret_val); } #endif /* HAVE_PARALLEL */