Annotation of rpl/lapack/lapack/iparam2stage.F, revision 1.1
1.1 ! bertrand 1: *> \brief \b IPARAM2STAGE
! 2: *
! 3: * =========== DOCUMENTATION ===========
! 4: *
! 5: * Online html documentation available at
! 6: * http://www.netlib.org/lapack/explore-html/
! 7: *
! 8: *> \htmlonly
! 9: *> Download IPARAM2STAGE + dependencies
! 10: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/iparam2stage.F">
! 11: *> [TGZ]</a>
! 12: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/iparam2stage.F">
! 13: *> [ZIP]</a>
! 14: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/iparam2stage.F">
! 15: *> [TXT]</a>
! 16: *> \endhtmlonly
! 17: *
! 18: * Definition:
! 19: * ===========
! 20: *
! 21: * INTEGER FUNCTION IPARAM2STAGE( ISPEC, NAME, OPTS,
! 22: * NI, NBI, IBI, NXI )
! 23: * #if defined(_OPENMP)
! 24: * use omp_lib
! 25: * #endif
! 26: * IMPLICIT NONE
! 27: *
! 28: * .. Scalar Arguments ..
! 29: * CHARACTER*( * ) NAME, OPTS
! 30: * INTEGER ISPEC, NI, NBI, IBI, NXI
! 31: *
! 32: *> \par Purpose:
! 33: * =============
! 34: *>
! 35: *> \verbatim
! 36: *>
! 37: *> This program sets problem and machine dependent parameters
! 38: *> useful for xHETRD_2STAGE, xHETRD_H@2HB, xHETRD_HB2ST,
! 39: *> xGEBRD_2STAGE, xGEBRD_GE2GB, xGEBRD_GB2BD
! 40: *> and related subroutines for eigenvalue problems.
! 41: *> It is called whenever ILAENV is called with 17 <= ISPEC <= 21
! 42: *> \endverbatim
! 43: *
! 44: * Arguments:
! 45: * ==========
! 46: *
! 47: *> \param[in] ISPEC
! 48: *> \verbatim
! 49: *> ISPEC is integer scalar
! 50: *> ISPEC specifies which tunable parameter IPARAM2STAGE should
! 51: *> return.
! 52: *>
! 53: *> ISPEC=17: the optimal blocksize nb for the reduction to
! 54: * BAND
! 55: *>
! 56: *> ISPEC=18: the optimal blocksize ib for the eigenvectors
! 57: *> singular vectors update routine
! 58: *>
! 59: *> ISPEC=19: The length of the array that store the Housholder
! 60: *> representation for the second stage
! 61: *> Band to Tridiagonal or Bidiagonal
! 62: *>
! 63: *> ISPEC=20: The workspace needed for the routine in input.
! 64: *>
! 65: *> ISPEC=21: For future release.
! 66: *> \endverbatim
! 67: *>
! 68: *> \param[in] NAME
! 69: *> \verbatim
! 70: *> NAME is character string
! 71: *> Name of the calling subroutine
! 72: *> \endverbatim
! 73: *>
! 74: *> \param[in] OPTS
! 75: *> \verbatim
! 76: *> OPTS is CHARACTER*(*)
! 77: *> The character options to the subroutine NAME, concatenated
! 78: *> into a single character string. For example, UPLO = 'U',
! 79: *> TRANS = 'T', and DIAG = 'N' for a triangular routine would
! 80: *> be specified as OPTS = 'UTN'.
! 81: *> \endverbatim
! 82: *>
! 83: *> \param[in] NI
! 84: *> \verbatim
! 85: *> NI is INTEGER which is the size of the matrix
! 86: *> \endverbatim
! 87: *>
! 88: *> \param[in] NBI
! 89: *> \verbatim
! 90: *> NBI is INTEGER which is the used in the reduciton,
! 91: * (e.g., the size of the band), needed to compute workspace
! 92: * and LHOUS2.
! 93: *> \endverbatim
! 94: *>
! 95: *> \param[in] IBI
! 96: *> \verbatim
! 97: *> IBI is INTEGER which represent the IB of the reduciton,
! 98: * needed to compute workspace and LHOUS2.
! 99: *> \endverbatim
! 100: *>
! 101: *> \param[in] NXI
! 102: *> \verbatim
! 103: *> NXI is INTEGER needed in the future release.
! 104: *> \endverbatim
! 105: *
! 106: * Authors:
! 107: * ========
! 108: *
! 109: *> \author Univ. of Tennessee
! 110: *> \author Univ. of California Berkeley
! 111: *> \author Univ. of Colorado Denver
! 112: *> \author NAG Ltd.
! 113: *
! 114: *> \date June 2016
! 115: *
! 116: *> \ingroup auxOTHERauxiliary
! 117: *
! 118: *> \par Further Details:
! 119: * =====================
! 120: *>
! 121: *> \verbatim
! 122: *>
! 123: *> Implemented by Azzam Haidar.
! 124: *>
! 125: *> All detail are available on technical report, SC11, SC13 papers.
! 126: *>
! 127: *> Azzam Haidar, Hatem Ltaief, and Jack Dongarra.
! 128: *> Parallel reduction to condensed forms for symmetric eigenvalue problems
! 129: *> using aggregated fine-grained and memory-aware kernels. In Proceedings
! 130: *> of 2011 International Conference for High Performance Computing,
! 131: *> Networking, Storage and Analysis (SC '11), New York, NY, USA,
! 132: *> Article 8 , 11 pages.
! 133: *> http://doi.acm.org/10.1145/2063384.2063394
! 134: *>
! 135: *> A. Haidar, J. Kurzak, P. Luszczek, 2013.
! 136: *> An improved parallel singular value algorithm and its implementation
! 137: *> for multicore hardware, In Proceedings of 2013 International Conference
! 138: *> for High Performance Computing, Networking, Storage and Analysis (SC '13).
! 139: *> Denver, Colorado, USA, 2013.
! 140: *> Article 90, 12 pages.
! 141: *> http://doi.acm.org/10.1145/2503210.2503292
! 142: *>
! 143: *> A. Haidar, R. Solca, S. Tomov, T. Schulthess and J. Dongarra.
! 144: *> A novel hybrid CPU-GPU generalized eigensolver for electronic structure
! 145: *> calculations based on fine-grained memory aware tasks.
! 146: *> International Journal of High Performance Computing Applications.
! 147: *> Volume 28 Issue 2, Pages 196-209, May 2014.
! 148: *> http://hpc.sagepub.com/content/28/2/196
! 149: *>
! 150: *> \endverbatim
! 151: *>
! 152: * =====================================================================
! 153: INTEGER FUNCTION IPARAM2STAGE( ISPEC, NAME, OPTS,
! 154: $ NI, NBI, IBI, NXI )
! 155: #if defined(_OPENMP)
! 156: use omp_lib
! 157: #endif
! 158: IMPLICIT NONE
! 159: *
! 160: * -- LAPACK auxiliary routine (version 3.7.0) --
! 161: * -- LAPACK is a software package provided by Univ. of Tennessee, --
! 162: * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
! 163: * June 2016
! 164: *
! 165: * .. Scalar Arguments ..
! 166: CHARACTER*( * ) NAME, OPTS
! 167: INTEGER ISPEC, NI, NBI, IBI, NXI
! 168: *
! 169: * ================================================================
! 170: * ..
! 171: * .. Local Scalars ..
! 172: INTEGER I, IC, IZ, KD, IB, LHOUS, LWORK, NTHREADS,
! 173: $ FACTOPTNB, QROPTNB, LQOPTNB
! 174: LOGICAL RPREC, CPREC
! 175: CHARACTER PREC*1, ALGO*3, STAG*5, SUBNAM*12, VECT*3
! 176: * ..
! 177: * .. Intrinsic Functions ..
! 178: INTRINSIC CHAR, ICHAR, MAX
! 179: * ..
! 180: * .. External Functions ..
! 181: INTEGER ILAENV
! 182: EXTERNAL ILAENV
! 183: * ..
! 184: * .. Executable Statements ..
! 185: *
! 186: * Invalid value for ISPEC
! 187: *
! 188: IF( (ISPEC.LT.17).OR.(ISPEC.GT.21) ) THEN
! 189: IPARAM2STAGE = -1
! 190: RETURN
! 191: ENDIF
! 192: *
! 193: * Get the number of threads
! 194: *
! 195: NTHREADS = 1
! 196: #if defined(_OPENMP)
! 197: !$OMP PARALLEL
! 198: NTHREADS = OMP_GET_NUM_THREADS()
! 199: !$OMP END PARALLEL
! 200: #endif
! 201: * WRITE(*,*) 'IPARAM VOICI NTHREADS ISPEC ',NTHREADS, ISPEC
! 202: *
! 203: IF( ISPEC .NE. 19 ) THEN
! 204: *
! 205: * Convert NAME to upper case if the first character is lower case.
! 206: *
! 207: IPARAM2STAGE = -1
! 208: SUBNAM = NAME
! 209: IC = ICHAR( SUBNAM( 1: 1 ) )
! 210: IZ = ICHAR( 'Z' )
! 211: IF( IZ.EQ.90 .OR. IZ.EQ.122 ) THEN
! 212: *
! 213: * ASCII character set
! 214: *
! 215: IF( IC.GE.97 .AND. IC.LE.122 ) THEN
! 216: SUBNAM( 1: 1 ) = CHAR( IC-32 )
! 217: DO 100 I = 2, 12
! 218: IC = ICHAR( SUBNAM( I: I ) )
! 219: IF( IC.GE.97 .AND. IC.LE.122 )
! 220: $ SUBNAM( I: I ) = CHAR( IC-32 )
! 221: 100 CONTINUE
! 222: END IF
! 223: *
! 224: ELSE IF( IZ.EQ.233 .OR. IZ.EQ.169 ) THEN
! 225: *
! 226: * EBCDIC character set
! 227: *
! 228: IF( ( IC.GE.129 .AND. IC.LE.137 ) .OR.
! 229: $ ( IC.GE.145 .AND. IC.LE.153 ) .OR.
! 230: $ ( IC.GE.162 .AND. IC.LE.169 ) ) THEN
! 231: SUBNAM( 1: 1 ) = CHAR( IC+64 )
! 232: DO 110 I = 2, 12
! 233: IC = ICHAR( SUBNAM( I: I ) )
! 234: IF( ( IC.GE.129 .AND. IC.LE.137 ) .OR.
! 235: $ ( IC.GE.145 .AND. IC.LE.153 ) .OR.
! 236: $ ( IC.GE.162 .AND. IC.LE.169 ) )SUBNAM( I:
! 237: $ I ) = CHAR( IC+64 )
! 238: 110 CONTINUE
! 239: END IF
! 240: *
! 241: ELSE IF( IZ.EQ.218 .OR. IZ.EQ.250 ) THEN
! 242: *
! 243: * Prime machines: ASCII+128
! 244: *
! 245: IF( IC.GE.225 .AND. IC.LE.250 ) THEN
! 246: SUBNAM( 1: 1 ) = CHAR( IC-32 )
! 247: DO 120 I = 2, 12
! 248: IC = ICHAR( SUBNAM( I: I ) )
! 249: IF( IC.GE.225 .AND. IC.LE.250 )
! 250: $ SUBNAM( I: I ) = CHAR( IC-32 )
! 251: 120 CONTINUE
! 252: END IF
! 253: END IF
! 254: *
! 255: PREC = SUBNAM( 1: 1 )
! 256: ALGO = SUBNAM( 4: 6 )
! 257: STAG = SUBNAM( 8:12 )
! 258: RPREC = PREC.EQ.'S' .OR. PREC.EQ.'D'
! 259: CPREC = PREC.EQ.'C' .OR. PREC.EQ.'Z'
! 260: *
! 261: * Invalid value for PRECISION
! 262: *
! 263: IF( .NOT.( RPREC .OR. CPREC ) ) THEN
! 264: IPARAM2STAGE = -1
! 265: RETURN
! 266: ENDIF
! 267: ENDIF
! 268: * WRITE(*,*),'RPREC,CPREC ',RPREC,CPREC,
! 269: * $ ' ALGO ',ALGO,' STAGE ',STAG
! 270: *
! 271: *
! 272: IF (( ISPEC .EQ. 17 ) .OR. ( ISPEC .EQ. 18 )) THEN
! 273: *
! 274: * ISPEC = 17, 18: block size KD, IB
! 275: * Could be also dependent from N but for now it
! 276: * depend only on sequential or parallel
! 277: *
! 278: IF( NTHREADS.GT.4 ) THEN
! 279: IF( CPREC ) THEN
! 280: KD = 128
! 281: IB = 32
! 282: ELSE
! 283: KD = 160
! 284: IB = 40
! 285: ENDIF
! 286: ELSE IF( NTHREADS.GT.1 ) THEN
! 287: IF( CPREC ) THEN
! 288: KD = 64
! 289: IB = 32
! 290: ELSE
! 291: KD = 64
! 292: IB = 32
! 293: ENDIF
! 294: ELSE
! 295: IF( CPREC ) THEN
! 296: KD = 16
! 297: IB = 16
! 298: ELSE
! 299: KD = 32
! 300: IB = 16
! 301: ENDIF
! 302: ENDIF
! 303: IF( ISPEC.EQ.17 ) IPARAM2STAGE = KD
! 304: IF( ISPEC.EQ.18 ) IPARAM2STAGE = IB
! 305: *
! 306: ELSE IF ( ISPEC .EQ. 19 ) THEN
! 307: *
! 308: * ISPEC = 19:
! 309: * LHOUS length of the Houselholder representation
! 310: * matrix (V,T) of the second stage. should be >= 1.
! 311: *
! 312: * Will add the VECT OPTION HERE next release
! 313: VECT = OPTS(1:1)
! 314: IF( VECT.EQ.'N' ) THEN
! 315: LHOUS = MAX( 1, 4*NI )
! 316: ELSE
! 317: * This is not correct, it need to call the ALGO and the stage2
! 318: LHOUS = MAX( 1, 4*NI ) + IBI
! 319: ENDIF
! 320: IF( LHOUS.GE.0 ) THEN
! 321: IPARAM2STAGE = LHOUS
! 322: ELSE
! 323: IPARAM2STAGE = -1
! 324: ENDIF
! 325: *
! 326: ELSE IF ( ISPEC .EQ. 20 ) THEN
! 327: *
! 328: * ISPEC = 20: (21 for future use)
! 329: * LWORK length of the workspace for
! 330: * either or both stages for TRD and BRD. should be >= 1.
! 331: * TRD:
! 332: * TRD_stage 1: = LT + LW + LS1 + LS2
! 333: * = LDT*KD + N*KD + N*MAX(KD,FACTOPTNB) + LDS2*KD
! 334: * where LDT=LDS2=KD
! 335: * = N*KD + N*max(KD,FACTOPTNB) + 2*KD*KD
! 336: * TRD_stage 2: = (2NB+1)*N + KD*NTHREADS
! 337: * TRD_both : = max(stage1,stage2) + AB ( AB=(KD+1)*N )
! 338: * = N*KD + N*max(KD+1,FACTOPTNB)
! 339: * + max(2*KD*KD, KD*NTHREADS)
! 340: * + (KD+1)*N
! 341: LWORK = -1
! 342: SUBNAM(1:1) = PREC
! 343: SUBNAM(2:6) = 'GEQRF'
! 344: QROPTNB = ILAENV( 1, SUBNAM, ' ', NI, NBI, -1, -1 )
! 345: SUBNAM(2:6) = 'GELQF'
! 346: LQOPTNB = ILAENV( 1, SUBNAM, ' ', NBI, NI, -1, -1 )
! 347: * Could be QR or LQ for TRD and the max for BRD
! 348: FACTOPTNB = MAX(QROPTNB, LQOPTNB)
! 349: IF( ALGO.EQ.'TRD' ) THEN
! 350: IF( STAG.EQ.'2STAG' ) THEN
! 351: LWORK = NI*NBI + NI*MAX(NBI+1,FACTOPTNB)
! 352: $ + MAX(2*NBI*NBI, NBI*NTHREADS)
! 353: $ + (NBI+1)*NI
! 354: ELSE IF( (STAG.EQ.'HE2HB').OR.(STAG.EQ.'SY2SB') ) THEN
! 355: LWORK = NI*NBI + NI*MAX(NBI,FACTOPTNB) + 2*NBI*NBI
! 356: ELSE IF( (STAG.EQ.'HB2ST').OR.(STAG.EQ.'SB2ST') ) THEN
! 357: LWORK = (2*NBI+1)*NI + NBI*NTHREADS
! 358: ENDIF
! 359: ELSE IF( ALGO.EQ.'BRD' ) THEN
! 360: IF( STAG.EQ.'2STAG' ) THEN
! 361: LWORK = 2*NI*NBI + NI*MAX(NBI+1,FACTOPTNB)
! 362: $ + MAX(2*NBI*NBI, NBI*NTHREADS)
! 363: $ + (NBI+1)*NI
! 364: ELSE IF( STAG.EQ.'GE2GB' ) THEN
! 365: LWORK = NI*NBI + NI*MAX(NBI,FACTOPTNB) + 2*NBI*NBI
! 366: ELSE IF( STAG.EQ.'GB2BD' ) THEN
! 367: LWORK = (3*NBI+1)*NI + NBI*NTHREADS
! 368: ENDIF
! 369: ENDIF
! 370: LWORK = MAX ( 1, LWORK )
! 371:
! 372: IF( LWORK.GT.0 ) THEN
! 373: IPARAM2STAGE = LWORK
! 374: ELSE
! 375: IPARAM2STAGE = -1
! 376: ENDIF
! 377: *
! 378: ELSE IF ( ISPEC .EQ. 21 ) THEN
! 379: *
! 380: * ISPEC = 21 for future use
! 381: IPARAM2STAGE = NXI
! 382: ENDIF
! 383: *
! 384: * ==== End of IPARAM2STAGE ====
! 385: *
! 386: END
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