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Strategies & Market Trends : TA-HARD & SOFTWARE
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To: Liam Kingsmill who wrote (86)8/30/1997 4:11:00 PM
From: Sean W. Smith   of 163
 
Liam,

heres a few tips to using system monitor.

Setup I like to look it is:
Kernal: Processor Usage
Memory Manager:Allocated Memory
Memory Manager:Page Faults
File System: Bytes read/second
File System: Bytes written/second

And if your running client or server for microsoft
networking add Microsoft: Networking (Client/Server) Bytes read/sec
Networking (Client/Server) Bytes Written/sec

Processor usage displays percentage of cpu cycles being used

Allocated Memory show total allocated memory. looking a memory free
in a virutal memory subsystem is next to useless. Most multitasking OS's will not flush discarded pages until all free ram has been
allocated at least once. So this indicator is used to show you total
memory size in use.

Page Faults: Page faults are normal part of operation of a virutal memory system. Too many of them though is a big indicator that you
running low on memory. In a virutal memory system all the system memory are divided into pages. since it is virtual you are allowed to have more pages than physical ram exists. As programs require memory, pages not currently being executed are written to disk and the pages they occupy are cleared and re-assigned re-assigned for new use. Because of the large differrence between hitting the l2 cache with a 10ns cycle or waiting for a page to flush and then reload off of disk.
Too many page faults is also commonly called thrashing.

Bytes Read / Written is an overal throughput indicator for the filesystem.

I have to go to the store. More on this subject later....

Sean
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