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perf: increase default LRU cache size to reduce multi-model thrash #21139

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Merged
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Feb 17, 2026
Merged

perf: increase default LRU cache size to reduce multi-model thrash #21139

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73e589f
perf: increase default LRU cache size to 64
emerzon Feb 13, 2026
96c0349
chore: remove default LRU constant test
emerzon Feb 13, 2026
693a8e0
docs: update DEFAULT_MAX_LRU_CACHE_SIZE default to 64
emerzon Feb 13, 2026
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2 changes: 1 addition & 1 deletion docs/my-website/docs/proxy/config_settings.md
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Expand Up @@ -538,7 +538,7 @@ router_settings:
| DEFAULT_IMAGE_WIDTH | Default width for images. Default is 300
| DEFAULT_IN_MEMORY_TTL | Default time-to-live for in-memory cache in seconds. Default is 5
| DEFAULT_MANAGEMENT_OBJECT_IN_MEMORY_CACHE_TTL | Default time-to-live in seconds for management objects (User, Team, Key, Organization) in memory cache. Default is 60 seconds.
| DEFAULT_MAX_LRU_CACHE_SIZE | Default maximum size for LRU cache. Default is 16
| DEFAULT_MAX_LRU_CACHE_SIZE | Default maximum size for LRU cache. Default is 64
| DEFAULT_MAX_RECURSE_DEPTH | Default maximum recursion depth. Default is 100
| DEFAULT_MAX_RECURSE_DEPTH_SENSITIVE_DATA_MASKER | Default maximum recursion depth for sensitive data masker. Default is 10
| DEFAULT_MAX_RETRIES | Default maximum retry attempts. Default is 2
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4 changes: 3 additions & 1 deletion litellm/constants.py
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Expand Up @@ -285,7 +285,9 @@
REPEATED_STREAMING_CHUNK_LIMIT = int(
os.getenv("REPEATED_STREAMING_CHUNK_LIMIT", 100)
) # catch if model starts looping the same chunk while streaming. Uses high default to prevent false positives.
DEFAULT_MAX_LRU_CACHE_SIZE = int(os.getenv("DEFAULT_MAX_LRU_CACHE_SIZE", 16))
# Shared maxsize for functools.lru_cache usage across hot paths.
# Defaulted to 64 to avoid cache thrash in multi-model production workloads.
DEFAULT_MAX_LRU_CACHE_SIZE = int(os.getenv("DEFAULT_MAX_LRU_CACHE_SIZE", 64))
_REALTIME_BODY_CACHE_SIZE = 1000 # Keep realtime helper caches bounded; workloads rarely exceed 1k models/intents
INITIAL_RETRY_DELAY = float(os.getenv("INITIAL_RETRY_DELAY", 0.5))
MAX_RETRY_DELAY = float(os.getenv("MAX_RETRY_DELAY", 8.0))
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