On Tue, May 29, 2018 at 11:32 AM Richard Biener <richard.guent...@gmail.com>
wrote:
> On Mon, May 28, 2018 at 5:50 PM Allan Sandfeld Jensen <li...@carewolf.com>
> wrote:
> > On Montag, 28. Mai 2018 12:58:20 CEST Richard Biener wrote:
> > > compile-time effects of the patch on that. Embedded folks may want to
> rhn
> > > their favorite benchmark and report results as well.
> > >
> > > So I did a -O2 -march=haswell [-ftree-slp-vectorize] SPEC CPU 2006
> compile
> > > and run and the compile-time
> > > effect where measurable (SPEC records on a second granularity) is
within
> > > one second per benchmark
> > > apart from 410.bwaves (from 3s to 5s) and 481.wrf (76s to 78s).
> > > Performance-wise I notice significant
> > > slowdowns for SPEC FP and some for SPEC INT (I only did a train run
> > > sofar). I'll re-run with ref input now
> > > and will post those numbers.
> > >
> > If you continue to see slowdowns, could you check with either no avx, or
> with
> > -mprefer-avx128? The occational AVX256 instructions might be
downclocking
> the
> > CPU. But yes that would be a problem for this change on its own.
> So here's a complete two-run with ref input, peak is -O2 -march=haswell
> -ftree-slp-vectorize.
> It confirms the slowdowns in SPEC FP but not in SPEC INT. You are right
> that using
> AVX256 (or AVX512) might be problematic on its own but that is not
> restricted to
> -O2 -ftree-slp-vectorize but also -O3. I will re-benchmark the SPEC FP
> part with
> -mprefer-avx128 to see if that is the issue. Note I did not use any
> -ffast-math flags in the
> experiment - those are as "unlikely" as using -march=native together with
> -O2. In theory
> another issue is the ability to debug code.
> Base Base Base Peak Peak Peak
> Benchmarks Ref. Run Time Ratio Ref. Run Time Ratio
> -------------- ------ --------- --------- ------ ---------
---------
> 410.bwaves 13590 362 37.5 * 13590 370 36.7
> *
> 410.bwaves 13590 365 37.2 S 13590 377 36.0
> S
> 416.gamess 19580 558 35.1 * 19580 598 32.7
> *
> 416.gamess 19580 560 35.0 S 19580 600 32.6
> S
> 433.milc 9180 331 27.8 S 9180 374 24.6
> *
> 433.milc 9180 331 27.8 * 9180 383 24.0
> S
> 434.zeusmp 9100 301 30.2 S 9100 301 30.2
> *
> 434.zeusmp 9100 301 30.2 * 9100 302 30.1
> S
> 435.gromacs 7140 300 23.8 S 7140 303 23.6
> S
> 435.gromacs 7140 298 23.9 * 7140 301 23.8
> *
> 436.cactusADM 11950 495 24.1 S 11950 482 24.8
> *
> 436.cactusADM 11950 486 24.6 * 11950 484 24.7
> S
> 437.leslie3d 9400 289 32.5 * 9400 288 32.6
> *
> 437.leslie3d 9400 301 31.3 S 9400 289 32.5
> S
> 444.namd 8020 301 26.6 * 8020 301 26.6
> *
> 444.namd 8020 301 26.6 S 8020 301 26.6
> S
> 447.dealII 11440 255 44.9 * 11440 252 45.3
> *
> 447.dealII 11440 255 44.9 S 11440 253 45.3
> S
> 450.soplex 8340 212 39.4 S 8340 213 39.1
> S
> 450.soplex 8340 211 39.5 * 8340 211 39.5
> *
> 453.povray 5320 111 47.9 S 5320 113 47.0
> S
> 453.povray 5320 111 48.0 * 5320 113 47.2
> *
> 454.calculix 8250 748 11.0 * 8250 835
9.88
> *
> 454.calculix 8250 748 11.0 S 8250 835
9.88
> S
> 459.GemsFDTD 10610 324 32.8 S 10610 324 32.8
> S
> 459.GemsFDTD 10610 323 32.9 * 10610 323 32.9
> *
> 465.tonto 9840 449 21.9 S 9840 469 21.0
> *
> 465.tonto 9840 446 22.0 * 9840 469 21.0
> S
> 470.lbm 13740 253 54.3 * 13740 255 53.9
> S
> 470.lbm 13740 253 54.2 S 13740 254 54.2
> *
> 481.wrf 11170 415 26.9 * 11170 416 26.9
> S
> 481.wrf 11170 417 26.8 S 11170 416 26.9
> *
> 482.sphinx3 19490 456 42.7 * 19490 465 41.9
> *
> 482.sphinx3 19490 464 42.0 S 19490 468 41.6
> S
Numbers with -mprefer-avx128:
Base Base Base Peak Peak Peak
Benchmarks Ref. Run Time Ratio Ref. Run Time Ratio
-------------- ------ --------- --------- ------ --------- ---------
410.bwaves 13590 365 37.2
*
410.bwaves 13590 374 36.4
S
416.gamess 19580 596 32.9
*
416.gamess 19580 596 32.8
S
433.milc 9180 378 24.3
S
433.milc 9180 375 24.5
*
434.zeusmp 9100 302 30.1
S
434.zeusmp 9100 302 30.2
*
435.gromacs 7140 299 23.9
*
435.gromacs 7140 299 23.9
S
436.cactusADM 11950 483 24.7
S
436.cactusADM 11950 482 24.8
*
437.leslie3d 9400 290 32.5
*
437.leslie3d 9400 302 31.1
S
444.namd 8020 301 26.6
*
444.namd 8020 301 26.6
S
447.dealII 11440 253 45.2
*
447.dealII 11440 253 45.2
S
450.soplex 8340 212 39.3
S
450.soplex 8340 211 39.5
*
454.calculix 8250 750 11.0
*
454.calculix 8250 750 11.0
S
459.GemsFDTD 10610 323 32.9
*
459.GemsFDTD 10610 323 32.8
S
465.tonto 9840 466 21.1
*
465.tonto 9840 466 21.1
S
470.lbm 13740 254 54.2
*
470.lbm 13740 255 54.0
S
481.wrf 11170 417 26.8
*
481.wrf 11170 417 26.8
S
482.sphinx3 19490 465 41.9
*
482.sphinx3 19490 473 41.2
S
so the situation improves but isn't fully fixed (STLF issues maybe?)
> Base Base Base Peak Peak Peak
> Benchmarks Ref. Run Time Ratio Ref. Run Time Ratio
> -------------- ------ --------- --------- ------ ---------
---------
> 400.perlbench 9770 251 38.9 S 9770 252
38.8
> S
> 400.perlbench 9770 250 39.1 * 9770 251
39.0
> *
> 401.bzip2 9650 399 24.2 S 9650 397
24.3
> S
> 401.bzip2 9650 395 24.4 * 9650 395
24.4
> *
> 403.gcc 8050 246 32.8 S 8050 245
32.9
> S
> 403.gcc 8050 244 33.0 * 8050 243
33.1
> *
> 429.mcf 9120 251 36.3 S 9120 248
36.8
> *
> 429.mcf 9120 250 36.5 * 9120 248
36.8
> S
> 445.gobmk 10490 394 26.6 S 10490 392
26.8
> *
> 445.gobmk 10490 393 26.7 * 10490 392
26.8
> S
> 456.hmmer 9330 389 24.0 S 9330 388
24.0
> *
> 456.hmmer 9330 389 24.0 * 9330 389
24.0
> S
> 458.sjeng 12100 447 27.1 * 12100 439
27.5
> *
> 458.sjeng 12100 449 27.0 S 12100 449
26.9
> S
> 462.libquantum 20720 309 67.0 S 20720 307
67.5
> S
> 462.libquantum 20720 302 68.7 * 20720 300
69.1
> *
> 464.h264ref 22130 457 48.5 S 22130 459
48.2
> S
> 464.h264ref 22130 456 48.6 * 22130 459
48.2
> *
> 471.omnetpp 6250 307 20.4 * 6250 308
20.3
> *
> 471.omnetpp 6250 317 19.7 S 6250 310
20.2
> S
> 473.astar 7020 346 20.3 * 7020 347
20.2
> *
> 473.astar 7020 346 20.3 S 7020 347
20.2
> S
> 483.xalancbmk 6900 198 34.8 * 6900 199
34.7
> *
> 483.xalancbmk 6900 202 34.2 S 6900 203
34.1
> S
> > 'Allan
