Set n_batch to default values and reduce thread count:

Change batch size to the llama.cpp default of 8. I've seen issues in llama.cpp where batch size affects quality of generations. (It shouldn't) But in case that's still an issue I changed to default.

Set auto-determined num of threads to 1/2 system count. ggml will sometimes lock cores at 100% while doing nothing. This is being addressed, but can cause bad experience for user if pegged at 100%

examples/high_level_api/fastapi_server.py

@@ -27,10 +27,10 @@ from sse_starlette.sse import EventSourceResponse
 class Settings(BaseSettings):
     model: str
     n_ctx: int = 2048
-    n_batch: int = 2048
-    n_threads: int = os.cpu_count() or 1
+    n_batch: int = 8
+    n_threads: int = int(os.cpu_count() / 2) or 1
     f16_kv: bool = True
-    use_mlock: bool = True
+    use_mlock: bool = False     # This causes a silent failure on platforms that don't support mlock (e.g. Windows) took forever to figure out...
     embedding: bool = True
     last_n_tokens_size: int = 64
 

llama_cpp/server/__main__.py

@@ -28,9 +28,9 @@ class Settings(BaseSettings):
     model: str
     n_ctx: int = 2048
     n_batch: int = 8
-    n_threads: int = os.cpu_count() or 1
+    n_threads: int = int(os.cpu_count() / 2) or 1
     f16_kv: bool = True
-    use_mlock: bool = True
+    use_mlock: bool = False     # This causes a silent failure on platforms that don't support mlock (e.g. Windows) took forever to figure out...
     embedding: bool = True
     last_n_tokens_size: int = 64