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Old 04-27-2012, 07:41 AM   #1
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LAMP server perfornace on Amazon

Guys... I am working with a client who has a m2.xlarge instance on Amazon AWS.

High-Memory Extra Large (m2.xlarge)
6.5 ECUs
2 Cores
17.1 GB

It's running as a LAMP server.... and it's a dynamic site.

This is consuming so much Mem. and CPU. What do I need to do to improve server performance ?

It's using all the 17GB the server has. I don't understand. Mysql is the one who is taking most memory usage. Can some of you please help me ? I really appreciate Thanks

top - 08:39:52 up 8 days, 17:17, 1 user, load average: 2.39, 2.77, 2.71
Tasks: 86 total, 3 running, 83 sleeping, 0 stopped, 0 zombie
Cpu(s): 65.1%us, 25.5%sy, 0.0%ni, 9.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.2%st
Mem: 17920000k total, 17537304k used, 382696k free, 3581084k buffers
Swap: 0k total, 0k used, 0k free, 3803376k cached

7908 iwd 25 0 103m 7180 3008 R 99.3 0.0 2219:51 svn
2668 mysql 16 0 358m 99m 7528 S 75.7 0.6 3483:18 mysqld
6503 apache 16 0 344m 28m 4852 S 2.7 0.2 0:53.35 httpd
3900 iwd 16 0 252m 68m 6588 S 1.3 0.4 1:25.17 php
1 root 16 0 10348 676 572 S 0.0 0.0 0:00.12 init
Old 04-27-2012, 08:38 AM   #2
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Do any of the MySQL databases make use of MEMORY for a table storage engine? If so, what size of tables are they? MySQL will also tend to grab memory for use as a cache.

What is the output of sar? What processes are using the most memory and cpu when you look at the output of top over time?

Those may give you a clue.
Old 04-27-2012, 09:16 AM   #3
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Suggested reading: (a my.cnf analyzer with links to related references) (a tight fit...)

A key thing to realize about high-performance server programs is that, left to their own devisings (which you shouldn't do), they know that "memory is the fastest thing there is." So they naturally tend to favor the use of it. But... they have no way to know what's virtual and what's not. They also don't know what other applications are in the same box with them; they don't know how their activities are affecting others.

In the case of an Amazon cloud (virtual machine ...) server, you also don't know anything about their silicon except that it's "beefy." You can naturally assume that Amazon has moderately over-committed their servers (this is a pragmatic fact, not a slam...) but you don't know by how much.

Therefore, you need to configure your total-deployment of software within your server so that, (a) the various players are "good, friendly companions" with one another, and (b) the virtual-machine they all live in is "a good, friendly companion" with all the other VM's in the same (unknown to you...) box.

Therefore, decide how much RAM you're going to use (a less-than-100% percentage of what you've been promised), and carve that space up among the various processes assuming that all of them are going "hell-bent to leather" processing the biggest orders you've ever had, for five of the most important customer you've ever dreamed of. Configure each server process so that it knows "the honest-to-stars truth" about what it's allowed to have use of, such that it can be guaranteed the use of those resources on a continuous basis under aggressive loads (without significant swap activity).

Last edited by sundialsvcs; 04-27-2012 at 09:19 AM.
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Old 04-27-2012, 01:48 PM   #4
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I am trying those things.. but there's something that I really don't understand...

the server has 17.1 GB of memory....

then LAMP is up.. this is the memory usage.
free -m
total used free shared buffers cached
Mem: 17500 17184 315 0 2778 4479
-/+ buffers/cache: 9926 7573
0 0 0

When I turn off mysqld and httpd (which are the most consuming process in cpu and memory) The memory usage still almost as the same value

#free -m
total used free shared buffers cached
Mem: 17500 16698 801 0 2778 4478
-/+ buffers/cache: 9441 8058
Swap: 0 0 0
Old 04-27-2012, 02:18 PM   #5
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Run this command:

cat /proc/meminfo | grep -i inactive
Do some reading on linux kernel memory management. It will almost always show very little free memory due to the fact that it does not clean and free up memory that was used previously until another application needs it. It will be lumped into your 'cached' section and will be marked as 'dirty inactive' memory.

It sounds like your client is more than likely running a WordPress or Joomla site with those symptoms, I have seen it enough times now to now. First thing to do is set MySQL to log your slow queries, you will more than likely find you have queries that are taking 10-30 seconds to complete and are killing the utilization of the server. That is due to the tables not being indexed properly for the queries it is running.


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