Additional Resources; Installed Documentation; Useful Websites - Red Hat ENTERPRISE LINUX 3 - INTRODUCTION TO SYSTEM ADMINISTRATION Administration Manual

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The field represents the desired size of the inactive list. This value is calculated by the
inatarpg
Linux kernel and is sized such that the inactive list remains large enough to act as a pool for page
replacement purposes.
For additional insight into page status (specifically, how often pages change status), use the
report. Here is a sample report:
Linux 2.4.20-1.1931.2.231.2.10.entsmp (raptor.example.com)
12:00:01 AM frmpg/s
12:10:00 AM -0.10
12:20:00 AM
...
08:50:01 PM -3.19
Average:
The statistics in this particular
When positive, the value indicates the rate at which pages of this type are increasing. When negative,
the value indicates the rate at which pages of this type are decreasing. A value of zero indicates that
pages of this type are neither increasing or decreasing.
In this example, the last sample shows slightly over three pages per second being allocated from the
list of free pages (the
field). The list of pages used as buffers (the
campg/s
every two seconds, while the shared memory page list (the
pages.

4.7. Additional Resources

This section includes various resources that can be used to learn more about resource monitoring and
the Red Hat Enterprise Linux-specific subject matter discussed in this chapter.

4.7.1. Installed Documentation

The following resources are installed in the course of a typical Red Hat Enterprise Linux installation
and can help you learn more about the subject matter discussed in this chapter.
man page — Displays free and used memory statistics.
• free(1)
man page — Displays a concise overview of process, memory, swap, I/O, system, and
• vmstat(8)
CPU utilization.
man page — Produces system resource utilization reports.
• sar(1)
man page — Produces daily system resource utilization report files.
• sa2(8)

4.7.2. Useful Websites

http://linuxperf.nl.linux.org/ — The Linux Performance Tuning homepage. Provides a good in-
•
troductory overview of resource monitoring for performance tuning purposes. The mailing list,
unfortunately, appears to have been overrun by spam and is no longer used.
http://people.redhat.com/alikins/system_tuning.html — System Tuning Info for Linux Servers. A
•
stream-of-consciousness approach to performance tuning and resource monitoring for servers.
shmpg/s
0.00
0.02 0.00
0.00
0.01 0.00
report are unique, in that they may be positive, negative, or zero.
sar
field) and nearly 1 page per second added to the page cache (the
frmpg/s
Chapter 4. Physical and Virtual Memory
bufpg/s campg/s
0.12 -0.07
0.19 -0.07
0.46 0.81
-0.00 -0.00
bugpg/s
shmpg/s
07/22/2003
field) gained approximately one page
field) neither gained nor lost any
sar -R