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Performance Analysis Summary

Overview

Analysis of PR #113 reveals minimal performance impact from the addition of sampler chain logging functionality. The change introduces a single debug logging statement in the server's slot initialization process without affecting core inference operations.

Key Findings

Performance Metrics:

• Highest Response Time change: llama_supports_rpc function showed +0.08% increase (+0.024 ns, from 29.66 ns to 29.68 ns)
• Highest Throughput change: llm_ffn_exps_block_regex function showed -0.13% improvement (-0.16 ns, from 120.85 ns to 120.69 ns)
• Changes are within compiler optimization variance and measurement noise

Core Function Impact:

• No modifications to critical inference functions (llama_decode, llama_encode, llama_tokenize)
• Token processing throughput remains unaffected
• No impact on tokens per second performance for the reference model (ollama://smollm:135m on 12th Gen Intel i7-1255U)

Power Consumption Analysis:

• All binaries maintain stable energy profiles with negligible variations (< 0.001%)
• libllama.so: 280,779.72 nJ (stable)
• llama-cvector-generator: 314,115.69 nJ (stable)
• No energy efficiency regressions identified

Flame Graph and CFG Analysis:

• llama_supports_rpc shows simple two-level execution structure with linear progression
• CFG comparison reveals identical assembly code and control flow between versions
• 0.02 ns timing variance attributed to compiler or binary layout differences rather than functional changes

Code Review Findings:

• Well-implemented debugging enhancement using SLT_INF logging
• Positioned correctly after sampler initialization validation
• Maintains backward compatibility with no API changes
• Adds operational visibility for sampler chain configuration

Conclusion:
The changes represent a pure debugging enhancement with no measurable performance impact on inference operations. All observed timing variations fall within normal compiler optimization variance, confirming the implementation maintains system performance while adding valuable debugging capabilities.