Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps Información técnica descargar pdf (Pagina 167)

Chapter 7 Troubleshooting the System 153

2. By charting the object counter Threads, it is evident that the thread count

grows in a manner similar to the tagged pool memory allocations and bytes

listed in Step 1. Depending on the amount of threads that are created, the

object counter Threads can jump to a high value immediately.

3. The object Process helps determine which process is causing the leak. Select

object counters Pool Nonpaged Bytes, Pool Paged Bytes, and Thread Count.

Chart all instances of these counters. The process leaking memory charts in a

manner similar to the pool memory charted in Step 1.

Identifying Memory Leaks in NT Services

Although Performance Monitor usually provides the necessary information to

determine which process is creating a pool leak, it does not always provide the

information necessary to determine the exact cause of a memory leak. A trend that

shows a memory leak can often be identified but an exact process is not always

identifiable as the cause of the memory leak.

If the process leaking memory is a service, you can identify which service it is by

stopping different services while using Performance Monitor to monitor the

number of threads running. The number of threads running depends on many

factors, but the number grows larger as the process leaking memory continues to

run.

ÛÛ

Û To determine which service is leaking memory

1. Run Performance Monitor and add the Threads counter for the object type

Object to the chart.

2. From Control Panel, double-click Services.

3. Tile the windows so you can see both Performance Monitor and the Services

dialog box.

4. Stop and start the active services one at a time.

If the service that is leaking memory has been running long enough, there will

be a drastic reduction in threads when the service is stopped.

If no services are leaking memory, the leak could be caused by a regular

program. Repeat the above procedure, but instead of stopping services, close and

open all active programs one at a time.

Note

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Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps Información técnica Pagina 167