How do you baseline performance with PerfMon

[bob]

I grab PerfMon right when things feel off and you start watching those counters build up over hours. You pick processor time first because it shows the real load on your box. Then memory pages per second comes next and you let the log run long enough to catch normal patterns. Or perhaps disk activity jumps in ways you did not expect so you note the averages without forcing any quick fixes. Also network bytes total keeps you honest about traffic spikes that hit during peak times. I always run the collection for a full week at least because short bursts never give the full picture you need later.
You compare the numbers against later logs once changes roll out and I find that helps spot what actually shifted under the hood. Perhaps the queue length on storage tells a story about bottlenecks you missed before so you track it steady. But you avoid overthinking every blip since some variation stays normal in any setup. Now the key sits in saving those initial logs somewhere safe for reference and you pull them up when performance drifts again. I hammer together a simple report from the data to share with the team and it keeps everyone on the same page without extra tools. Then you might adjust the sampling rate if the file grows too big too fast and that keeps things manageable on your drive.
Also I check for any weird outliers in the graphs because they point to one off events worth ignoring in the baseline. You run the same counters on test machines first to see if your choices make sense before going live. Perhaps the context switches climb higher than thought so you factor that into future tweaks. But the whole process stays hands on and you tweak as you learn what matters most in your environment. Now the baseline becomes your yardstick for upgrades and you rely on it when arguing for new hardware. I keep multiple sets going in parallel sometimes because different apps need their own view of the system.
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