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IBM AIX memory management mechanism is what kind of, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can gain something.

Feedback aix system often takes up 99% of the memory, is there any hidden trouble?

AIX's memory management is different from SUN and HP. We use lag refresh, that is to say, AIX

The design philosophy is that for applications that run stably, the application repeatedly calls the same

The possibility of two data files is very high, so, in order to reduce the disk I / O as much as possible, improve the speed of reading files.

Avoid having to read the data file from disk every time when repeated calls are made, and any process in AIX calls the file into

Enter the memory, and even if the process ends and releases the occupied memory, the system does not immediately transfer the used memory segment

Refresh to the "fre" state, but mark it as a file page no-comp in memory, such as

If the application repeatedly calls to the file, it can read the data directly from memory.

In AIX, any process is requesting to use memory as long as there is clean memory in the system that has not been used.

Always take up unused memory space first, as long as you allow what can be put in memory as much as possible

Only when physical memory is occupied to unused memory space with only 120 pages left

Automatically starts the memory refresh process, which will no longer use used memory according to AIX's memory refresh algorithm

Address refresh to available "fre". Once the memory is cleared to "fre" more than 128pages, the refresh process starts from

Stop and wait until the next time the memory needs to be refreshed before restarting. This is not to say that only 8 is released at a time.

Pages, but based on the amount of memory requested, for example, when a process requests memory, it requests 100MB at one time

Then you can also set it to "fre" at one time when refreshing memory.

Therefore, in the AIX operating system, after the system runs for a long time, the memory "fre" in the system is very

Small, and the memory footprint ratio is often more than 99%, as long as the system usage of pagingspace is not increasing.

Just because the memory "fre" is too small does not mean that the system has a memory leak. If you want to check the internal part of the system

Memory usage or memory leak monitoring, it is recommended to use pagingspace utilization monitoring, such as when

Alarm warning when pagespace usage reaches 50% or something.

You only need to observe whether the system PI, PO and PAGING SAPCE continue to grow. If these two items continue to grow, it needs to be paid attention to, otherwise there is no need to pay attention, which is a normal phenomenon.

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