Measuring Performance of Layer/Service Implementations in Parallel

I want to "measure" two different layer/service implementations. What would be the simplest or more correct way ? I have a "program" defined and I just pipe it to whatever layer I want to test. The thing is they run in parallel, so I'm not sure if they are influencing each other . Also, commenting one run or the other and run the file is simple, but not very convenient
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