2000 SRM Associates, Ltd. Windows NT/2000 Performance and Capacity Key Metrics Jerry L. Rosenberg SRM Associates, Ltd.

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Presentation transcript:

2000 SRM Associates, Ltd. Windows NT/2000 Performance and Capacity Key Metrics Jerry L. Rosenberg SRM Associates, Ltd.

2000 SRM Associates, Ltd. Capacity and Performance Performance Tuning Identify bottlenecks and take immediate corrective action Capacity Planning Anticipate future bottlenecks and avoid them Understand current usage Project for expected changes

2000 SRM Associates, Ltd. NT Data There is a very rich set of data available in NT from Performance Monitor It is critical to avoid data overload Particularly in time critical performance situations, it is vital to pinpoint the problem and correct it rapidly

2000 SRM Associates, Ltd. Still only categories of data Processor I/O Memory What about Network ?

2000 SRM Associates, Ltd. Performance Standard If the processor is not excessively busy and work is completing on schedule, all is well. If work is not meeting service levels and the processor use is excessive, begin by examining the processor.

2000 SRM Associates, Ltd. Performance Standard If work is not meeting service levels and the processor use is not excessive, look to I/O or memory as the problem. Beware: It is not quite that simple.

2000 SRM Associates, Ltd. Processor Processor: % Processor Time < 50% 80% = Danger System: % Total Processor Time Processor: Interrupts/sec < 3500 for Pentium System: Processor Queue Length < 2

2000 SRM Associates, Ltd.

Processor – Other Metrics System:Context Switches/sec Process:% Processor Time, % Priv. Time, % User Time, Priority Base Thread:% Processor Time, Priority Current

2000 SRM Associates, Ltd. Memory Soft Faults Page/faults/sec Hard Faults Pages/sec

2000 SRM Associates, Ltd.

Paging Standard Memory: Pages/sec * PhysicalDisk: Average Disk sec/Transfer = amount of disk time spent on paging activity during the interval. Should not exceed 10% 20% = thrashing

2000 SRM Associates, Ltd. Percent of Time Spent on Paging

2000 SRM Associates, Ltd. Memory – Other Metrics Memory:Available Bytes Process:Page Faults/sec, Working Set

2000 SRM Associates, Ltd. I/O Physical Actual Device Logical Partition Need diskperf –y or diskperf -ye

2000 SRM Associates, Ltd. I/O % Disk Time < 55% Current Disk Queue Length < 2 Avg. Disk Bytes/Transfer Big numbers are good

2000 SRM Associates, Ltd. I/O – Other Metrics Memory:Pages/sec Physical Disk:Average Disk Bytes Read, Disk Bytes/sec Processor:% Processor Time, Interrupts/sec

2000 SRM Associates, Ltd.

Network Complex and configuration dependent Protocols NICs Network Applications Topology Maybe multiple protocol stacks Hint: monitor Redirector object

2000 SRM Associates, Ltd. NIC example NIC: Output Queue Length < 2 Bytes Total/sec Should not be high if OQL < 2 If collisions greater than 10%, Network issue

2000 SRM Associates, Ltd.

Network – Other Metrics Network Segment:% Net Util., Total Bytes Received/sec Memory: Pages/sec Logical Disk:% Free Space Paging File:% Peak Usage Physical Disk: % Disk Time, Avg. Q Len. Processor:% Processor Time

2000 SRM Associates, Ltd.

Performance Concentrate on the area of failure Limit the metrics analyzed to key counters Have historical data

2000 SRM Associates, Ltd. Capacity Build an historical data base Review the report periodically for trend changes Model possible effects

2000 SRM Associates, Ltd. Jerry Rosenberg Strategic Resource Management Associates, Ltd

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