Load Average (System load) description

Linux Load Average

The average system load is defined as the average number of processes running in a queue during a specific time interval. If a process meets the following criteria, it will be in the run queue:
-It is not in the result of waiting for I/O operation
-It does not actively enter the waiting state (that is, "Wait" is not called)

-not stopped (for example: waiting to be terminated)

Load average:0.09, 0.05, 0.01

three numbers represent the system average load for different time periods (one minute, five minutes, and 15 minutes)

from a performance perspective, a host with a multi-core processor with the same number of different processing performance can basically be considered similar. Of course, the actual situation will be much more complex, different amounts of cache, processor frequency and other factors can cause performance differences.

But even if the actual performance of these factors is slightly different, the system still calculates the load mean at the core of the processor. This brings us to two new laws:

• "How many cores are the number of loads" rule: in multicore processing, your system's average value should not be higher than the total number of processor cores.
• "Core Core " principle: the core distribution in a few individual physical processing is not important, in fact, two quad-core processor equals four dual-core processor equals eight single processor. So, it should have eight processor cores.

The rule of thumb is this (with a single core standard):

When the system load continues to be greater than 0.7, you must start investigating where the problem is and prevent the situation from deteriorating.

When the system load continues to be greater than 1.0, you have to find a solution and drop this value down.

When the system load reaches 5.0, it indicates that your system has a serious problem, long time no response, or close to the freezing. You should not let the system reach this value.

If only 1 minutes of system load is greater than 1.0, the other two time periods are less than 1.0, which indicates that only a temporary phenomenon, the problem is not big.

If the average system load is greater than 1.0 (after adjusting the CPU cores) within 15 minutes, the problem persists, not a temporary phenomenon. Therefore, you should mainly observe the "15-minute system load", as the computer normal operation of the indicator.

Load Average (System load) description