This is post number 3 in a series of unanswered "TUNING" questions.
With AIX 5.3 TL4, the page size can vary from the original "4k". They can now be "64k" and a couple other sizes. They also do not have to all be the same. Some can remain "4k" while others are "64k" which is what seems to be going on in my system. Does anyone know of any advantages to moving from 4k sized pages to 64k sized pages? With my server having about 13 gig of memory, I think this can only help, right? It's an oracle database server.
You can see the size of your pages in memory with this command:
Here is what the output from my machine looks like. The page sizes are the last 2 lines:
Hello,
I'm using a unix server (HP rp2450) which has : 2 Go RAM memory and 4 Go swap.
Here is the result of vmstat -n command :
$ vmstat -n
VM
memory page faults
avm free re at pi po fr de sr in sy ... (5 Replies)
We have been tuning MySQL lately and I ran accoss two useful tools that you might be interested in:
mysqltuner.pl
tuning-primer.sh
Both of these scripts are quite useful for MySQL tuning. Here is some sample output of mysqltuner.pl
>> MySQLTuner 0.9.8 - Major Hayden... (3 Replies)
We just set up a system to use large pages. I want to know if there is a command to see how much of the memory is being used for large pages. For example if we have a system with 8GB of RAm assigned and it has been set to use 4GB for large pages is there a command to show that 4GB of the *GB is... (1 Reply)
I have to check whether AIX fills physical memory pages by zeros when they are given for a new process (or may be when they are freed from an address space, but it's hardly probable).
In other words when a process gets a new memory page, this one must be cleaned.
I've solved this issue for... (2 Replies)
Hello,
I've been reading your forums for quite a while and the great amount of information I find here always come in hand.This time however, I need some specific help...
I have a doubt with an AIX server which I'm failing to understand as I'm new to its concept of memory management...
... (8 Replies)
Hi everyone,
i have a question about the Memory Management in AIX 6.1.
I have
- 128 GB RAM and
- 70 GB Page Space.
The application i am running on this machine is doing some operations in perl. These are done only once a day and uses both memory and paging space. My problem... (1 Reply)
I am not sure where to post this so i will put it in the newbie section.
I have set up a bog standard debain 6, LAMP environment in the cloud.
The specs
1 core at 2GH
2.5gb Memory
running Jommla, with about 1.6K visitors a day.
I am using AppFirst (appfirst.com) to monitor the... (2 Replies)
Greetings,
i'm wondering if there is a way to determine minimum memory requirement for AIX kernel and OS functions? We use memdetails script from perfpmr package to see actual memory allocation, for example like this:
===========================================================================... (5 Replies)
Discussion started by: dzodzo
5 Replies
LEARN ABOUT DEBIAN
getpagesizes
getpagesizes(3C) Standard C Library Functions getpagesizes(3C)NAME
getpagesizes - get system supported page sizes
SYNOPSIS
#include <sys/mman.h>
int getpagesizes(size_t pagesize[], int nelem);
DESCRIPTION
The getpagesizes() function returns either the number of different page sizes supported by the system or the actual sizes themselves. When
called with nelem as 0 and pagesize as NULL, getpagesizes() returns the number of supported page sizes. Otherwise, up to nelem page sizes
are retrieved and assigned to successive elements of pagesize[]. The return value is the number of page sizes retrieved and set in page-
size[].
RETURN VALUES
Upon successful completion, the number of pagesizes supported or actually retrieved is returned. Otherwise, -1 is returned and errno is set
to indicate the error.
ERRORS
The getpagesizes() function will fail if:
EINVAL The nelem argument is less than 0 or pagesize is NULL but nelem is non-zero.
USAGE
The getpagesizes() function returns all the page sizes for which the hardware and system software provide support for the memcntl(2) com-
mand MC_HAT_ADVISE. Not all processors support all page sizes or combinations of page sizes with equal efficiency. Applications programmers
should take this into consideration when using getpagesizes().
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO memcntl(2), mmap(2), getpagesize(3C), attributes(5)SunOS 5.10 14 May 2001 getpagesizes(3C)