O/ρ is a reference to two quantities in IT performance engineering:
- Big-O notation is used to describe time complexity of algorithms - how algorithm execution time scales with the volume of the input.
- \( \rho \) is defined to be the utilization of queuing systems.
Inadequate or lack of attention for scalability and utilization is a common cause for failing IT projects. Moreover, efficient software has a smaller environmental footprint - it uses less energy.
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