01-02-2013
The load balancer is going to be a choking point (bandwidth and CPU utilization-wise). If it's bandwidth you may consider increasing the number of links. You can try to increase links through interface bonding. If it's CPU utilization, you might consider multiple load balances (kind of like google.com does) so you can spread load amongst several physical machines. I'd recommend doing that latter anyways, for availability reasons.
Before anyone can give you specific advice though, you need to localize the performance issue. For example, if you run a jMeter test against the serving nodes directly is that faster? If it is, then the load balancer is the choke point. If not then you may check to see if the network links are being saturated with some sort of command-line bandwidth checking tool (I use bwm-ng). If that's not the issue then move onto CPU, memory, etc. Once you've done that you should be in a better position to do something about the performance problems.
It's also possible that it's an application-level latency. For example if a particular website is served by a particular DB cluster and that cluster is going slow it may slow down the end user's experience.
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LEARN ABOUT SUSE
wmsmpmon
WMSMPMON(1) General Commands Manual WMSMPMON(1)
NAME
wmSMPmon - Window Maker System Monitor
SYNOPSIS
wmSMPmon [options]
DESCRIPTION
wmSMPmon is a Window Maker dock application that displays the following information about the system:
- Current CPU utilization of up to two CPUs
- Up to two minutes history of CPU utilization
- Current memory usage
- Current swap usage
On dual CPU systems, wmSMPmon has three different styles for the utilization graph. To toggle between them just click into the graph.
OPTIONS
All options start with one dash.
-h Show summary of options.
-r REFRESH_RATE
Set the refresh rate of the graph in microseconds. The default is 250000 (a quarter of a second).
-g GRAPH_STYLE
Start using graph style #[1-3] (only on dual CPU systems). Style 1 shows the utiliziation in one graph, while 2 and 3 are split in
two little graphs. Style 2 shows the two graphs on top of each other. Style 3 uses a mirror like type. The default style is 1, which
is also the style used on single CPU systems.
-c1 IDX, -c2 IDX
On systems with more than 2 CPUs, select the CPUs to show. Per default CPU number 1 and 2 are shown. On a quad CPU systems you may
launch second wmSMPmon showing CPUs number 3 and 4.
-no-swap
Do not monitor swap.
SEE ALSO
wmaker(1x)
AUTHOR
This manual page was originally written by Alain Schroeder <alain@debian.org> and adapted for wmSMPmon 3 by Thomas Ribbrock
<emgaron@gmx.net>
WMSMPMON(1)