Add unique prefix - increasing counter #217
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The SyntheticTextItemsGenerator was generating prompts that could trigger vLLM's automatic prefix caching, leading to hitting the prefix cache up to 80% in some cases during the performance benchmarking.
Implemented unique prefix injection to guarantee 0% prefix cache hit rate while maintaining realistic prompt characteristics.
Test:
Performing some tests on the H200 target accelerator to confirm the fix.