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[GH-ISSUE #12927] Modelfile PARAMETER num_ctx is ignored when lower than model's native context length #8574
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opened 2026-04-12 21:18:26 -05:00 by GiteaMirror
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Reference: github-starred/ollama#8574
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Originally created by @SuperSonnix71 on GitHub (Nov 3, 2025).
Original GitHub issue: https://github.com/ollama/ollama/issues/12927
Modelfile
PARAMETER num_ctxis ignored when lower than model's native context lengthHey folks, ran into a frustrating issue where setting
PARAMETER num_ctxin a Modelfile doesn't actually work if you're trying to reduce the context below what the model was trained with.The Problem
I have a custom model (sqlcoder-7b-2.fp16.gguf) with a native context of 16384. I want to limit it to 4096 to save memory, especially when running with
OLLAMA_NUM_PARALLEL=4.Here's my Modelfile:
After creating the model with
ollama create sql2 -f modelfile, the model completely ignores thenum_ctx 4096setting:Notice it's using 16384 context (the native length) instead of 4096 (what I set).
Why This Matters
With
OLLAMA_NUM_PARALLEL=4, this creates a massive KV cache:When I actually want:
Logs Showing the Issue
Here's what the logs show when loading the model with
PARAMETER num_ctx 4096in the Modelfile:See how
n_ctx_per_seq = 16384instead of 4096? The Modelfile setting is completely ignored.The NON working Workaround
The only way I could get it to work ( temporarily) was by setting an environment variable in the systemd service:
After adding this and restarting:
Logs showed:
Perfect! Now
n_ctx_per_seq = 4096and memory usage is down to 24 GB.And then all the sudden when it gets loaded again i see
NAME ID SIZE PROCESSOR CONTEXT UNTIL
sql2:latest 9e4fefbf18f8 70 GB 100% GPU 16384 4 minutes from now
Expected Behavior
PARAMETER num_ctxin the Modelfile should be respected, even when setting a context length lower than the model's native training context. If there's a reason it can't be lower, there should at least be a warning when creating the model.Environment
Reproduction
PARAMETER num_ctx 4096ollama create mymodel -f modelfileollama ps- context will be native length, not 4096n_ctx_per_seqwill show native lengthWould be great if Modelfile parameters actually worked as documented, or if there's a clear explanation of why they can't override native context lengths.
@rick-github commented on GitHub (Nov 3, 2025):
Server logs will aid in debugging.
@SuperSonnix71 commented on GitHub (Nov 3, 2025):
@rick-github Thanks for your response! here it is
The model file:
@rick-github commented on GitHub (Nov 3, 2025):
What client are you using to trigger the model load? Would you be comfortable with pushing the model to the ollama user library so it could be downloaded and examined?
@SuperSonnix71 commented on GitHub (Nov 3, 2025):
Hey folks, quick update after testing this more thoroughly:
Everything's working correctly in Ollama 0.12.9
I updated to the latest version (0.12.9) and ran extensive tests on my setup with 6× RTX 4090 GPUs. Turns out both Modelfile
PARAMETER num_ctxandOLLAMA_CONTEXT_LENGTHenvironment variable work perfectly fine.My Test Setup
Hardware:
Software:
Service config:
sql2 Modelfile (sqlcoder-7b-2.fp16.gguf, 13GB):
Test Results
Single Model Tests
Logs for sql2 with OLLAMA_NUM_PARALLEL=4:
Multiple Models Running Together
Loaded 3 big models at once to see what happens:
Total memory: ~120 GB across all 6 GPUs
All models kept their correct context lengths.
Priority Order (confirmed working)
PARAMETER num_ctx(takes precedence)OLLAMA_CONTEXT_LENGTHenvironment variableSo it looks like the original issue was either fixed in a recent update or I had something misconfigured initially. After updating to 0.12.9 and testing with multiple models (including ones with huge native contexts like 40k-130k), everything works as expected. Both Modelfile parameters and environment variables properly override the native context length.