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Use fixed size for sub-quadratic chunking on MPS

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Even if this causes chunks to be much smaller, performance isn't significantly impacted. This will usually reduce memory usage but should also help with poor performance when free memory is low.
This commit is contained in:
brkirch 2023-05-08 18:16:01 -04:00
parent 3163d1269a
commit abfa4ad8bc
1 changed files with 5 additions and 1 deletions
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6
modules/sd_hijack_optimizations.py
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@ -1,6 +1,7 @@
from __future__ import annotations
import math
import psutil
import platform
import torch
from torch import einsum
@ -427,7 +428,10 @@ def sub_quad_attention(q, k, v, q_chunk_size=1024, kv_chunk_size=None, kv_chunk_
qk_matmul_size_bytes = batch_x_heads * bytes_per_token * q_tokens * k_tokens
if chunk_threshold is None:
chunk_threshold_bytes = int(get_available_vram() * 0.9) if q.device.type == 'mps' else int(get_available_vram() * 0.7)
if q.device.type == 'mps':
chunk_threshold_bytes = 268435456 * (2 if platform.processor() == 'i386' else bytes_per_token)
else:
chunk_threshold_bytes = int(get_available_vram() * 0.7)
elif chunk_threshold == 0:
chunk_threshold_bytes = None
else: