Vulkan Optimizations and Fixes #8959
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Review Complexity : Medium
…ng and more * fixed default sampling queue to include p_step * changed sampling queue display to better reflect the actual logic * added VK-specific settings `use_mmap_vk`, `flash_attn_vk`, `no_kv_offload_vk` * added new presets for testing
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I missed a validation issue in #8943, but the fix is now in this branch. I think this should be ready for a review and then merge. |
| sz * FLOAT_TYPE((data_a[ib0 + i].scales[v_im + 4] & 0x0f) | ((data_a[ib0 + i].scales[v_im] & 0xc0) >> 2)) + sw * FLOAT_TYPE((data_a[ib0 + i].scales[v_im + 5] & 0x0f) | ((data_a[ib0 + i].scales[v_im + 1] & 0xc0) >> 2))) - dmin * smin); | ||
| const uint tmp_idx = 16 * ix + tid; | ||
| tmp[tmp_idx] = fma(dall, (fma(sx, FLOAT_TYPE(data_a[ib0 + i].scales[v_im] & 0x3f), fma(sy, FLOAT_TYPE(data_a[ib0 + i].scales[v_im + 1] & 0x3f), | ||
| fma(sz, FLOAT_TYPE((data_a[ib0 + i].scales[v_im + 4] & 0x0f) | ((data_a[ib0 + i].scales[v_im] & 0xc0) >> 2)), fma(sw, FLOAT_TYPE((data_a[ib0 + i].scales[v_im + 5] & 0x0f) | ((data_a[ib0 + i].scales[v_im + 1] & 0xc0) >> 2))))))), fma(-dmin, smin, tmp[tmp_idx])); |
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If you consider only the FMA changes, is there a measurable performance gain?
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It's very hard to tell. The GLSL compiler should be using FMA instructions anyways, basically this change just makes it certain instead of leaving it to the optimizer. Hopefully this means a few more FMA calls in SPIR-V, which could be checked.
But afterwards the SPIR-V code gets compiled again to a device-specific driver-internal representation, where some more optimization takes place. Since there are many combinations of devices, I can't really be sure whether this helped anywhere, but at least I'm sure it doesn't cause slow downs. I haven't seen a significant performance difference on my devices.
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@ggerganov @slaren Can one of you review the non-Vulkan parts of this PR and approve if that's fine? |
Vulkan Optimizations and Fixes (ggerganov#8959)
I have implemented a number of Vulkan optimizations and fixes:
I will keep this on draft while I check a few more things, but feel free to test and benchmark. Don't expect a huge difference.