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The heuristic we are currently using still stems from the GCN era
with the only adjustments being made for RDNA was to double (or triple)
the wave count.
This rewrite aims to detangle some concepts and provide more consistent results.
- wave_factor: The purpose of this value is to reflect that RDNA SIMDs can
accomodate twice as many waves as GCN SIMDs.
- reg_file_multiple: This value accounts for the larger register file of wave32
and some RDNA3 families.
- wave_minimum: Below this value, we don't sacrifice any waves. It corresponds
to a register demand of 64 VGPRs in wave64.
- occupancy_factor: Depending on target_waves and wave_factor, this controls
the scheduling window sizes and number of moves.
The main differences from the previous heuristic is a lower wave minimum and
a slightly less aggressive reduction of waves.
It also increases SMEM_MAX_MOVES in order to mitigate some of the changes
from targeting less waves.
Totals from 62777 (78.63% of 79839) affected shaders: (Navi48)
MaxWaves: 1880983 -> 1848028 (-1.75%); split: +0.01%, -1.76%
Instrs: 40904711 -> 40800797 (-0.25%); split: -0.39%, +0.14%
CodeSize: 217132208 -> 216748832 (-0.18%); split: -0.29%, +0.12%
VGPRs: 3019304 -> 3099596 (+2.66%); split: -0.11%, +2.77%
Latency: 268857129 -> 265951122 (-1.08%); split: -1.33%, +0.25%
InvThroughput: 40960938 -> 41044533 (+0.20%); split: -0.18%, +0.39%
VClause: 794000 -> 782913 (-1.40%); split: -2.24%, +0.84%
SClause: 1192476 -> 1150831 (-3.49%); split: -3.94%, +0.45%
Copies: 2720470 -> 2700148 (-0.75%); split: -1.84%, +1.09%
Branches: 785926 -> 785951 (+0.00%); split: -0.01%, +0.01%
VALU: 22918411 -> 22890189 (-0.12%); split: -0.19%, +0.06%
SALU: 5281201 -> 5289486 (+0.16%); split: -0.21%, +0.36%
VOPD: 8790 -> 8685 (-1.19%); split: +1.08%, -2.28%
Totals from 62081 (77.77% of 79825) affected shaders: (Navi31)
MaxWaves: 1848555 -> 1812347 (-1.96%); split: +0.01%, -1.97%
Instrs: 39794460 -> 39704180 (-0.23%); split: -0.39%, +0.16%
CodeSize: 208987052 -> 208621524 (-0.17%); split: -0.31%, +0.13%
VGPRs: 3046284 -> 3135156 (+2.92%); split: -0.11%, +3.03%
Latency: 268863465 -> 265218186 (-1.36%); split: -1.59%, +0.23%
InvThroughput: 41101515 -> 41167075 (+0.16%); split: -0.22%, +0.38%
VClause: 795316 -> 774899 (-2.57%); split: -3.17%, +0.61%
SClause: 1177294 -> 1135451 (-3.55%); split: -4.06%, +0.51%
Copies: 2743254 -> 2725127 (-0.66%); split: -1.90%, +1.24%
Branches: 801395 -> 801428 (+0.00%); split: -0.01%, +0.02%
VALU: 23898938 -> 23871294 (-0.12%); split: -0.20%, +0.08%
SALU: 3908807 -> 3919130 (+0.26%); split: -0.23%, +0.50%
VOPD: 8529 -> 8500 (-0.34%); split: +1.29%, -1.63%
Totals from 44996 (71.01% of 63370) affected shaders: (Vega10)
MaxWaves: 307074 -> 304808 (-0.74%); split: +0.63%, -1.37%
Instrs: 22743534 -> 22716240 (-0.12%); split: -0.22%, +0.10%
CodeSize: 117284856 -> 117173212 (-0.10%); split: -0.19%, +0.09%
SGPRs: 3249008 -> 3330480 (+2.51%); split: -0.36%, +2.87%
VGPRs: 1901400 -> 1943880 (+2.23%); split: -0.60%, +2.83%
Latency: 224839126 -> 222878477 (-0.87%); split: -1.19%, +0.31%
InvThroughput: 114389570 -> 114316559 (-0.06%); split: -0.17%, +0.11%
VClause: 482012 -> 473304 (-1.81%); split: -2.86%, +1.05%
SClause: 757799 -> 717092 (-5.37%); split: -5.64%, +0.27%
Copies: 2182735 -> 2183598 (+0.04%); split: -1.17%, +1.21%
Branches: 396026 -> 395996 (-0.01%); split: -0.03%, +0.02%
VALU: 16740283 -> 16728098 (-0.07%); split: -0.14%, +0.07%
SALU: 2133575 -> 2145863 (+0.58%); split: -0.29%, +0.86%
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30720>
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| src | ||
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| README.rst | ||
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| VERSION | ||
`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library ====================================================== Source ------ This repository lives at https://gitlab.freedesktop.org/mesa/mesa. Other repositories are likely forks, and code found there is not supported. Build & install --------------- You can find more information in our documentation (`docs/install.rst <https://docs.mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://docs.mesa3d.org/meson.html>`_): .. code-block:: sh $ meson setup build $ ninja -C build/ $ sudo ninja -C build/ install Support ------- Many Mesa devs hang on IRC; if you're not sure which channel is appropriate, you should ask your question on `OFTC's #dri-devel <irc://irc.oftc.net/dri-devel>`_, someone will redirect you if necessary. Remember that not everyone is in the same timezone as you, so it might take a while before someone qualified sees your question. To figure out who you're talking to, or which nick to ping for your question, check out `Who's Who on IRC <https://dri.freedesktop.org/wiki/WhosWho/>`_. The next best option is to ask your question in an email to the mailing lists: `mesa-dev\@lists.freedesktop.org <https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_ Bug reports ----------- If you think something isn't working properly, please file a bug report (`docs/bugs.rst <https://docs.mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://docs.mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.