XL Fortran Enterprise Edition for AIX : User's Guide - IBM

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XLFRTEOPTS="unit_vars=yes" # Allow overriding default names. XLFUNIT_1="/tmp/molecules.dat" # Use this named file. XLFUNIT_12="../data/scratch" # Relative to current directory. XLFUNIT_123="/home/user/data" # Somewhere besides /tmp. export XLFRTEOPTS XLFUNIT_1 XLFUNIT_12 XLFUNIT_123 Notes: 1. The XLFUNIT_number variable name must be in uppercase, and number must not have any leading zeros. 2. unit_vars=yes might be only part of the value for the XLFRTEOPTS variable, depending on what other run-time options you have set. See “Setting Run-Time Options” on page 51 for other options that might be part of the XLFRTEOPTS value. 3. If the unit_vars run-time option is set to no or is undefined or if the applicable XLFUNIT_number variable is not set when the program is run, the program uses a default name (fort.unit) for the file and puts it in the current directory. Naming Scratch Files To place all scratch files in a particular directory, set the TMPDIR environment variable to the name of the directory. The program then opens the scratch files in this directory. You might need to do this if your /tmp directory is too small to hold the scratch files. To give a specific name to a scratch file, you must do the following: 1. Set the run-time option scratch_vars. 2. Set an environment variable with a name of the form XLFSCRATCH_unit for each scratch file. The association is between a unit number in the Fortran program and a path name in the file system. In this case, the TMPDIR variable does not affect the location of the scratch file. For example, suppose that the Fortran program contains the following statements: OPEN (UNIT=1, STATUS=’SCRATCH’, & FORM=’FORMATTED’, ACCESS=’SEQUENTIAL’, RECL=1024) ... OPEN (UNIT=12, STATUS=’SCRATCH’, & FORM=’UNFORMATTED’, ACCESS=’DIRECT’, RECL=131072) ... OPEN (UNIT=123, STATUS=’SCRATCH’, & FORM=’UNFORMATTED’, ACCESS=’SEQUENTIAL’, RECL=997) XLFRTEOPTS="scratch_vars=yes" # Turn on scratch file naming. XLFSCRATCH_1="/tmp/molecules.dat" # Use this named file. XLFSCRATCH_12="../data/scratch" # Relative to current directory. XLFSCRATCH_123="/home/user/data" # Somewhere besides /tmp. export XLFRTEOPTS XLFSCRATCH_1 XLFSCRATCH_12 XLFSCRATCH_123 Notes: 1. The XLFSCRATCH_number variable name must be in uppercase, and number must not have any leading zeros. 2. scratch_vars=yes might be only part of the value for the XLFRTEOPTS variable, depending on what other run-time options you have set. See “Setting Run-Time Options” on page 51 for other options that might be part of the XLFRTEOPTS value. 3. If the scratch_vars run-time option is set to no or is undefined or if the applicable XLFSCRATCH_number variable is not set when the program is run, the program chooses a unique file name for the scratch file and puts it in the directory named by the TMPDIR variable or in the /tmp directory if the TMPDIR variable is not set. 332 XL Fortran Enterprise Edition for AIX : User’s Guide
Increasing Throughput with Logical Volume I/O and Data Striping For performance-critical applications, the overhead of the Journaled File System (JFS) for I/O operations might slow down the program. If your program generates large scratch files, you might find that I/O bandwidth also limits its performance. Performing I/O directly to a logical volume rather than to a file system can eliminate the JFS overhead. Using data striping on the logical volume can further improve throughput or processor utilization or both. Related Information: Because data-striped I/O runs much faster for data items that are aligned more strictly than normal, be sure to use the “-qalign Option” on page 125 when compiling any programs that perform logical volume I/O or data striping. Implementation Details of XL Fortran Input/Output 333
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XL Fortran Enterprise Edition for A
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Note! Before using this information
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Options That Control Listings and M
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How XLF I/O Interacts with Pipes, S
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viii XL Fortran Enterprise Edition
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x XL Fortran Enterprise Edition for
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The following performance-related d
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How to Read the Syntax Diagrams and
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v Optionally, enter the value of at
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6 XL Fortran Enterprise Edition for
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Migration Support The XL Fortran co
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These items are located, or accesse
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v /usr/share/man/info/en_US/xlf/pos
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Notes: 1. Specifying the LC_ALL env
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3. Installing a compiler program te
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fsuffix cppsuffix osuffix ssuffix l
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mcrt = /lib/mcrt0_r.o gcrt = /lib/g
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options include -L/usr/lpp/xlf/lib,
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Related Information: You can use th
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Table 1. Potential Problems Migrati
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Table 1. Potential Problems Migrati
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►► xlf90 xlf90_r xlf90_r7 xlf95
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xlf90, xlf90_r, and xlf90_r7 comman
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Related Information: The ssuffix at
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Related Information: See “-qpdf O
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The @PROCESS compiler directive mus
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Passing Fortran Files through the C
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the trigraph sequence. XL Fortran u
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The configuration file /etc/xlf.cfg
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esulting program work as you expect
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v v Do not use names that are the s
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v v Build the application by using
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If you have applications in which F
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total_usertime Returns the total us
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To obtain support for items that ar
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Note: You may need the old setting
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These partitions are then assigned
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During the busy-wait search for wor
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(for example, loops for which you s
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Other Environment Variables That Af
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Options That Control Input to the C
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Table 3. Options That Control Input
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Table 5. Options for Performance Op
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Table 5. Options for Performance Op
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Table 6. Options for Debugging and
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Table 7. Options That Control Listi
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Table 8. Options for Compatibility
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v v Determine names and options for
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Detailed Descriptions of the XL For
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-1 Option Syntax -1 ONETRIP | NOONE
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-b64 Option Syntax -b64 The AIX ope
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Examples xlf95 f.f -brtl -bshared -
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-bloadmap Option Syntax -bloadmap:n
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-brtl Option Syntax -brtl | -bnortl
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-bstatic Option Related Information
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-c Option Syntax -c Prevents the co
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-d Option Syntax -d Causes preproce
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-g Option Syntax -g DBG | NODBG Gen
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-k Option Syntax -k FREE(F90) Speci
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-l Option Syntax -lkey Searches the
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-O Option Syntax -O[level] OPTimize
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-o Option Syntax -o name Specifies
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-p Option Syntax -p[g] Sets up the
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-q32 Option Related Information See
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-qalias Option Syntax -qalias={[no]
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equivalence (a, b(3)) t = b; a = t
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a derived type are stored with suff
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pwr2s p2sc You can run the executab
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v v If your primary concern is exec
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-qassert Option Syntax -qassert={de
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-qautodbl Option Syntax -qautodbl=s
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Related Information For background
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2 Level-2 cache or the table lookas
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-qcheck Option Syntax -qcheck | -qn
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-qcompact Option Syntax -qcompact |
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-qctyplss Option Syntax -qctyplss[(
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-qdbg Option Syntax -qdbg | -qnodbg
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-qdirective Option Syntax -qdirecti
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-qdirectstorage Option Syntax -qdir
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-qdpc Option Syntax -qdpc[=e] | -qn
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-qescape Option Syntax -qescape | -
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-qextchk Option Syntax -qextchk | -
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-qextname Option Syntax -qextname[=
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-qfdpr Option Syntax -qfdpr | -qnof
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-qflag Option Syntax -qflag=listing
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the reciprocal of the divisor. It a
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export SQRT_EXCEPTION=3.1 166 XL Fo
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-qfree Option Syntax -qfree[={f90|i
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-qhalt Option Syntax -qhalt=severit
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If you specify -qhot=novector, the
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-qhssngl Option Syntax -qhssngl | -
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-qinit Option Syntax -qinit=f90ptr
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v You can specify alphabetic digits
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-qintsize Option Syntax -qintsize=b
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-qipa Option Syntax -qipa[=suboptio
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If you specify short, the Object Fi
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Table 15. Regular expression syntax
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-qkeepparm Option Syntax -qkeepparm
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Restrictions The -qflag option can
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-qlibansi Option Related Informatio
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-qlibposix Option Related Informati
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-qlistopt Option Syntax -qlistopt |
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-qlog4 Option Syntax -qlog4 | -qnol
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Restrictions Depending on the sourc
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-qmixed Option Syntax -qmixed | -qn
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-qmodule Option Syntax -qmodule=man
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-qnullterm Option Syntax -qnullterm
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-qonetrip Option Syntax -qonetrip |
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-qpdf Option Syntax -qpdf{1|2} Tune
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mergepdf Generates a single pdf rec
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-qphsinfo Option Syntax -qphsinfo |
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-qpic Option Syntax -qpic[=suboptio
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sce | nosce } else if (a == 3) *res
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-qprefetch Option Syntax -qprefetch
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-qrealsize Option Syntax -qrealsize
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-qrecur Option Syntax -qrecur | -qn
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To produce a listing file that you
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-qsave Option Syntax -qsave[={all|d
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-qsclk Option Syntax -qsclk[=centi
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-qsigtrap Option Syntax -qsigtrap[=
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-qsmp Option Syntax -qsmp[=suboptio
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threshold=n The work in a partition
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xlf90 -qsmp=noopt -O3... is equival
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-qspillsize Option Syntax -qspillsi
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-qstrictieeemod Option Syntax -qstr
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-qsuffix Option Syntax -qsuffix=opt
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Examples @process nullterm i = 1; j
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Related Information See the OpenMP
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-qthreaded Option Syntax -qthreaded
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If you do not specify -qtune, its s
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-qundef Option Syntax -qundef | -qn
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-qunwind Option Syntax -qunwind |-q
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-qwarn64 Option See “-qwarn64 Opt
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-qxflag=xalias Option Syntax -qxfla
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intxor | nointxor Treats .XOR. as a
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Examples Consider the following pro
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In this example, conditional compil
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-qzerosize Option Syntax -qzerosize
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-t Option Syntax -tcomponents Appli
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-u Option Syntax -u UNDEF | NOUNDEF
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-V Option Syntax -V This option is
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$ ./a.out 1 2 3 4 276 XL Fortran En
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-y Option Syntax -y{n | m | p | z}
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64-Bit Thread Support On AIX Versio
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Page 302 and 303: v v If the data or program code con
Page 304 and 305: v Comparisons involving NaN values
Page 306 and 307: How XL Fortran Rounds Floating-Poin
Page 308 and 309: 2. For thread-safety and reentrancy
Page 310 and 311: v The fltint suboption speeds up fl
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Page 314 and 315: Another method is to use the ieee_s
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Page 318 and 319: The following example shows the dif
Page 320 and 321: v Code that might cause an exceptio
Page 322 and 323: Optimization levels Option -qnoopt/
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Page 326 and 327: v v v Reducing the costs of memory
Page 328 and 329: Loop unrolling also increases code
Page 330 and 331: 2. Run the application using a typi
Page 332 and 333: # Let the compiler decide (relative
Page 334 and 335: can also use the SNAPSHOT directive
Page 336 and 337: -qipa=list cross-file type checking
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Page 340 and 341: Stream-access formatted files: A re
Page 342 and 343: I/O Redirection The important thing
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Page 348 and 349: Logical Volume I/O To use a logical
Page 350 and 351: READ(unit_number,ID=idvar) a .... W
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Page 354 and 355: Table 22. Table for Binding an Appl
Page 356 and 357: v The result of an application does
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Page 360 and 361: v v The XL compilers generate code
Page 362 and 363: #include template class junk { pri
Page 364 and 365: Notes: 1. In interlanguage communic
Page 366 and 367: Table 25. Escape Sequences for Char
Page 368 and 369: You can use this built-in function
Page 370 and 371: The system linkage convention passe
Page 372 and 373: Run-time Stack for 32-bit Environme
Page 374 and 375: processing, and the fifth doublewor
Page 376 and 377: v v v v v v v In a 32-bit Environme
Page 378 and 379: Will Be Passed In: R3 0 Storage Map
Page 380 and 381: Function Values Functions return th
Page 382 and 383: Example The control structure has t
Page 384 and 385: technique can reduce the amount of
Page 386 and 387: Note: When you run an XL Fortran pr
Page 388 and 389: Duplicating Extensions from Other S
Page 390 and 391: Input/Output Errors If the error de
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Note that you cannot use the -qextn
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v v Memory leak reporting that indi
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HD_FILL HD_STACK=n called a certain
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388 XL Fortran Enterprise Edition f
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Source Section The source section c
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Attribute and Cross-Reference Secti
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Automating Large, Complex Compilati
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For fixed source form code, in addi
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Common Industry Extensions That XL
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Example 2 - Valid C Routine Source
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close(10) open(10, file="fun10.out"
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!**********************************
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operating system require the same o
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Examples of Storage Relationships f
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0 4 8 16 32 64 COMPLEX (16) COMPLEX
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! Data values between r8 and x16 ar
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end function sqrt real*8 function r
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Table 34. MASS Vector Library Funct
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IBM may use or distribute any of th
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ind. To relate an identifier to ano
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expression. A sequence of operands,
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name. A lexical token consisting of
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labels can be used to transfer cont
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.profile file 12 .s files 33, 34 .X
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fdate_ service and utility subprogr
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nonested_par suboption of -qsmp 234
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vi text editor 29 W W error severit
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