From c67c40f983997594f76b2312f92c3761e8d83715 Mon Sep 17 00:00:00 2001
From: Matthew McGoogan <mlmcgoogan@gmail.com>
Date: Sat, 26 Nov 2022 23:25:16 +0000
Subject: [PATCH] torch.cuda.empty_cache() defaults to cuda:0 device unless
 explicitly set otherwise first. Updating torch_gc() to use the device set by
 --device-id if specified to avoid OOM edge cases on multi-GPU systems.

---
 modules/devices.py | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/modules/devices.py b/modules/devices.py
index 67165bf66..93d82bbce 100644
--- a/modules/devices.py
+++ b/modules/devices.py
@@ -44,8 +44,18 @@ def get_optimal_device():
 
 def torch_gc():
     if torch.cuda.is_available():
-        torch.cuda.empty_cache()
-        torch.cuda.ipc_collect()
+        from modules import shared
+
+        device_id = shared.cmd_opts.device_id
+        
+        if device_id is not None:
+            cuda_device = f"cuda:{device_id}"
+        else:
+            cuda_device = "cuda"
+        
+        with torch.cuda.device(cuda_device):
+            torch.cuda.empty_cache()
+            torch.cuda.ipc_collect()
 
 
 def enable_tf32():