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Fix litellm connection pool limiting concurrent_requests #1190

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Fix litellm connection pool limiting concurrent_requests #1190

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11 changes: 11 additions & 0 deletions src/lighteval/models/endpoints/litellm_model.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@
from concurrent.futures import ThreadPoolExecutor
from json import JSONDecodeError

import httpx
import requests
from tqdm import tqdm

Expand Down Expand Up @@ -158,6 +159,16 @@ def __init__(self, config: LiteLLMModelConfig) -> None:
self.pairwise_tokenization = False
litellm.drop_params = True
litellm.verbose = config.verbose

# Configure litellm's global HTTP client to match concurrent_requests,
# avoiding the default httpx connection pool limit of 100.
litellm.client_session = httpx.Client(
limits=httpx.Limits(
max_connections=config.concurrent_requests,
max_keepalive_connections=config.concurrent_requests,
),
timeout=httpx.Timeout(config.timeout) if config.timeout else httpx.Timeout(None),
)
self.prompt_manager = PromptManager(
use_chat_template=True, tokenizer=self.tokenizer, system_prompt=config.system_prompt
)
Expand Down