did anybody has such problem? After migration appmon 7.0 + Classic agent into appmon 7.2.1 Appmon agent on IIS servers I see that page faults per second increased from 100-200 to 1000-2500. Memory looks ok on those hosts (nothing has changed from time before migration). What can be reason of such behavior?
Answer by Sebastian K. ·
Yes, you have to disable the collection of ETW metrics by setting the agent debug flag debugEnableEtwProfilingNative to false on Agent Group. This mechanism is creating and updating multiple small files. When you have multiple application pools on single host it causes page faults and iops issues.
Answer by Bent K. ·
We had the same issue. Also the CPU usage went up form 30% to 90%, and I saw that ETW was causing it with high I/O. Since we have more than 10 applications w3wp-processes per host, I guess the impact is higher than average. We had to set the debugEnableEtwProfilingNative to off.
It worries me that this huge performance hit is default behaviour on Agent Platfrom Switch.