%% Last Updated: [[2020-09-05]] %% # Performance Testing Basics What Is Resource Utilization? [Readwise URL](https://readwise.io/bookreview/4381745) | [Source URL](https://testguild.com/performance-test-resource-utilization/) ---  --- CPU utilization measurements can help determine how effective your test is. It can also be used as a gauge of how any tuning change you've made has affected the overall performance of the system. I like to think of CPU as the pulse rate in the overall health of a system. ^83460169 --- > On a windows machine go to Start>Run and type perfmon: > \ > \ > On a UNIX machine you could use vmstat 5 or on a mac from the terminal type vm_stat 5: ^83460170 --- > Memory > \ > This counter can help find potential memory leaks caused by your application. Based on Microsoft's recommendations in Performance Testing Microsoft .NET Web Applications, memory leaks can be found by monitoring: > \ > Memory\Available bytes > Process\Private Bytes > Process\Working Sets > Find a Memory Leak formula: > \ > A Memory leak will usually show Process\Private Bytes and Process\Working Sets increasing, and Memory\Available bytes decreasing. ^83460171 > A Memory leak will usually show Process\Private Bytes and Process\Working Sets increasing, and Memory\Available bytes decreasing. ^17cce0 --- Although when you hear the work "Disk" the first thing that most likely comes to mind is disk space, disk bottlenecks are usually related to time. ^83460172 --- > How to Find a Disk bottleneck formula: > \ > I/Os per Disk = [Read + (4xWrites)] / Number of Disk > \ ^83460173 --- > Network latency - The time it takes to send a data packet across a network connection > Network Round Trip - a client-server request and response generated by your application > Data transfer - The amount of info moved from a browser to a web server. ^83460174 ---