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CPU Model: Intel(R) Xeon(R) CPU E5405 @ 2.00GHz
CPU Speed: 2000.05MHz
Number of Processors: 4
Installed RAM: 15.68GB
Linux Distro: Debian 5.0.9
Kernel: 2.6.32.8-grsec-2.1.14-modsign-xeon-64 (SMP)
System load is a measure of the amount of work that a computer system performs (namely, the number of processes that are running). Load average is the average system load over a specific time period (or periods). Usually the load average appears as 3 sets of numbers. These numbers represent the load during the last 1, 5 and 15 minute periods. Using an example of load average being 3.23 3.98 4.20, you could conclude that over the past one minute there have been 3.23 processes at any one time, running at or waiting for resources. The 5 minute average would be 3.98 and the 15 minute load average would be 4.20.
Directly, nothing. But for your computers and servers, it means this...
For a single processor machine, a load average of 1 means that on average, there is always a process in the running (currently using the CPU) or in a runnable (waiting for CPU) state. So, the CPU is being utilized 100% of the time and is at capacity. If you were to run another process, it would then go into a queue to wait to be executed. If you have a multi-core/ multi-processor system, the number of processes that can be executed at any given time, increases. For example, if you have 2 dual core processors, the load average would have to be 4 to be fully utilized. If you have a quad core, it would be 4 as well. If you have more, the number goes up, less, it goes down.
Looking at our example numbers above, the 1 minute average load being at 3.23, on a machine with 2 dual core processors, would mean the machine is almost fully utilized. Now looking at all 3 numbers, you can see that the average number of processes decreases over the 15 minute time frame. (3.23=1 min 3.98=5 min 4.20=15 min)
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