fix(ollama): omit num_ctx unless caller sets it - #1389
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Stop injecting 32000 when unset so Ollama keeps its default and small hosts are not OOM killed (jonigl/mcp-client-for-ollama#305).
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Inline comments:
In `@tests/unit/providers/test_ollama_provider.py`:
- Line 940: Update the test covering explicit num_ctx to run in both streaming
and non-streaming modes by parametrizing the stream setting, and assert that
each path propagates num_ctx correctly through OllamaProvider._acompletion() and
_stream_completion_async().
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src/any_llm/providers/ollama/ollama.pytests/unit/providers/test_ollama_provider.py
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Hey 👋 ollmcp maintainer here, this is the fix for the report linked in the description. ollmcp deliberately leaves |
The explicit-value test only exercised the non-streaming call. Streaming forwards options through _stream_completion_async, a separate path, so parametrize over stream the same way the omit test already does. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Approved.
The 32000 override dated from when Ollama's default was a fixed 4096. Ollama now picks 4k/32k/256k from available VRAM, so the override both OOMs small hosts and caps large ones below what they can serve. Deferring to the server default is the right call, and it matches how every other provider in this repo treats params it was not given.
Pushed one commit parametrizing the explicit num_ctx test over streaming, since that path forwards options through a separate call.
Anyone relying on the old 32k should pass num_ctx per request or set OLLAMA_CONTEXT_LENGTH on the server. That will go in the release notes.
Note: this comment was drafted by Claude Opus 5 via back-and-forth with @njbrake. The reasoning and decisions are his; the prose is Claude's.
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Description
Stop injecting a hard-coded
num_ctx=32000when the caller did not set one.Ollama should choose its own default context size. Forcing 32000 allocates a huge KV cache and OOMs small hosts (real-world report: jonigl/mcp-client-for-ollama#305, RPi 5 8GB). Callers that pass an explicit
num_ctxstill get it unchanged. An explicitNoneis treated as unset and omitted.PR Type
Relevant issues
Related consumer impact: jonigl/mcp-client-for-ollama#305
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Tests
uv run pytest tests/unit/providers/test_ollama_provider.py -q→ 85 passeduv run pytest tests/unit -q→ 2500 passed, 6 failed (pre-existing bedrock/sagemaker collection/load issues unrelated to this Ollama-only diff)Summary by CodeRabbit