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Self-hosted LLMs show inconsistent outputs with parallel processing

Running the same prompt with a self-hosted LLM in parallel processes can lead to inconsistent outputs, even with temperature set to zero. This occurs because simultaneous requests processed in larger batches can produce different floating-point results due to GPU scheduling. Developers can detect this issue by implementing consistency probes before allowing the model to take actions in parallel agent applications. AI

IMPACT Highlights potential inconsistencies in self-hosted LLMs when used in parallel, impacting agent reliability.

RANK_REASON The item describes a technical finding about LLM behavior, not a product release or major industry event. [lever_c_demoted from research: ic=1 ai=1.0]

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · Alex ·

    Self-hosted LLM, same prompt, temperature zero - 6 different answers

    <p>Sequential execution was perfect, same expected answer 100% of the time. Looked like a reliable system. Then we ran the same test with five parallel processes, and the model started disagreeing with itself. It returned the expected answer only 87% of the time.</p> <p>What's ac…