Modifying the gfxsweep preset

[gilbertlee-amd]

Motivation

Tweak the gfxsweep preset to make it easier to import into spreadsheets / track which set of options yields the best results.
Also allow the use of multiple Transfers / wildcards

Technical Details

Re-wrote parts of preset

Test Result

Here's example output:

[GFX Sweep Related]
BLOCKSIZES           =            4 : 256,512,768,1024
GFX_TRANSFER         = R0G0->R0G0->R0G0 : GFX Transfer to sweep (see config file format)
NUM_SUB_EXECS        =            5 : 4,8,16,32,64
TEMPORAL_MODES       =            1 : 0
UNROLLS              =            4 : 1,2,4,8
WAVE_ORDERS          =            1 : 0
WORDSIZES            =            1 : 4
VERBOSE              =            0 : Display summary only

GFX sweep: (1048576 bytes per Transfer). All values are CPU-timed GB/s
=======================================================================================
Transfer     0: (G0->G0->G0)
=======================================================================================
 WvO   WSz   TpM   BlkS   UnR   SE 004  SE 008  SE 016  SE 032  SE 064
  0     4     0     256     1     5.38    6.00    7.79    6.76    4.22
  0     4     0     256     2    11.81    9.23    9.50    6.84    4.64
  0     4     0     256     4    12.05   11.29    8.98    6.44    4.58
  0     4     0     256     8    12.01   11.25    9.52    6.48    4.59
  0     4     0     512     1    11.75   10.65    9.33    6.80    4.63
  0     4     0     512     2    12.27   10.95    9.70    6.66    4.59
  0     4     0     512     4    11.76   11.26    8.54    6.62    4.58
  0     4     0     512     8    10.66   11.44    9.46    7.01    4.51
  0     4     0     768     1    10.09   11.37    8.69    6.91    4.65
  0     4     0     768     2    12.07   11.38    9.03    6.81    4.63
  0     4     0     768     4    12.10   11.30    8.97    6.40    4.66
  0     4     0     768     8    12.33   11.28    9.38    7.13    4.52
  0     4     0    1024     1    12.07   10.96    9.37    7.05    4.62
  0     4     0    1024     2    12.82   10.94    9.34    6.81    4.68
  0     4     0    1024     4    12.11   10.72    9.61    6.28    4.65
  0     4     0    1024     8    11.58   10.82    9.17    6.73    4.46
=======================================================================================
Highest bandwidth found:   12.82 GB/s (CPU-timed)
          WaveOrder    :       0
          WordSize     :       4
          Temporal Mode:       0
          BlockSize    :    1024
          Unroll       :       2
          NumSubExec   :       4

[Copilot]

Pull request overview

Updates the gfxsweep preset to produce more spreadsheet-friendly tabular output and to support sweeping across a configurable set of GFX kernel parameters while tracking the best-performing combination.

Changes:

• Reworked gfxsweep output into a single table with per-configuration rows and per-NUM_SUB_EXECS columns, plus a “best bandwidth” summary.
• Switched transfer selection to an env-var-driven string parsed via ParseTransfers, and iterates over multiple transfers (if produced by wildcard expansion).
• Simplified/updated the set of printed “related” environment variables for this preset.

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