Optimizing existing large codebase Measuare Mem threads low Outline Measuring Performance The nightmare of thread safety o What is performance oContext and constraints Tools available ldentifying problems o Finding bottlenecks o Solving problems ●Thread contention ②Code modernization 6 Low level optimizations Improving Memory Handling Scope and target o Context o How to measure 。Containers and memory ●Improving o Container reservation o Vectorization promises o Detecting offending code Conclusion 2/62 S.Ponce-CERNOptimizing existing large codebase 2 / 62 S. Ponce - CERN Measure Modernize Mem threads low level c/c Outline 1 Measuring Performance What is performance ? Tools available Finding bottlenecks 2 Code modernization 3 Improving Memory Handling Context Containers and memory Container reservation Detecting offending code 4 The nightmare of thread safety Context and constraints Identifying problems Solving problems Thread contention 5 Low level optimizations Scope and target How to measure ? Improving Vectorization promises 6 Conclusion