Apache Memory Usage, Why So Different On 2 VPSs

Mar 24, 2009

I currently have 2 VPSs that I'm monitoring and I noticed that on one of them the memory usage is much higher than the other which doesn't make sense to me. I tracked the high memory usage to the Apache processes.

Here's the overview of the VPSs:

LiquidWeb VPS- 512MB RAM, 10 Sites with minimal usage.
Average httpd process (Owner Priority Cpu% Mem% Command):
nobody 0 0.0 1.2 /usr/local/apache/bin/httpd -k start -DSSL

Virpus VPS- 384MB RAM, 61 sites with moderate usage.
Average httpd process (Owner Priority Cpu% Mem% Command):
nobody 0 0.0 0.3 /usr/local/apache/bin/httpd -k start -DSSL

Both Apache configurations are identical, the only difference besides the hardware is that LiquidWeb runs CentOS4.7 and Virpus runs CentOS5.2, any ideas? It's not to big of a deal since I'm not near my limit for either of them but I was just curious.

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How We Can Up The Apache Memory Usage

Nov 18, 2008

my grunted memory for apatchi is 51 meg
i want make him 256meg
because the vps its alwayes down
see this please

HTML Code:
29890 nobody 0

2.5

0.1 /usr/local/apache/bin/httpd -k start -DSSL
31854 nobody 0

2.3

0.1 /usr/local/apache/bin/httpd -k start -DSSL
31766 nobody 0

1.8

0.1 /usr/local/apache/bin/httpd -k start -DSSL
32043 nobody 0

1.7

0.1 /usr/local/apache/bin/httpd -k start -DSSL
25921 nobody 0

1.4

0.1 /usr/local/apache/bin/httpd -k start -DSSL
32014 nobody 0

1.3

0.1 /usr/local/apache/bin/httpd -k start -DSSL
25998 nobody 0

1.3

0.1 /usr/local/apache/bin/httpd -k start -DSSL
30388 nobody 0

1.0

0.1 /usr/local/apache/bin/httpd -k start -DSSL

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Aug 14, 2008

tell me what the average usage of the CPU and RAM be from apache?

User 'Nobody' (Which I presume is apache) is using 13% CPU and 38.98% of RAM. Is this normal or is it well overloaded?

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Apache Memory / Cpu Usage / Magento

Jul 31, 2014

I'm running a single Magento website with only around 150 products, and very low traffic, on a VPS with 2 Cores and 4GB of ram. However I am getting constant warning emails about high Apache Memory usage and High CPU usage.

The server and site were working fine, however since the server failed (Power cut on upgrade at the hosts end) and we rebuilt the website I'm getting these warnings, my host said it is just the website and the server needed upgrading... to which I did (server was a 1 core 2GB ram server). However since I've upgraded I'm still getting these warning emails.

Here is the latest one: URL...

Code:
4951 apache 20 0 441m 137m 6556 S 0.0 3.6 2:28.77 httpd
4952 apache 20 0 443m 139m 7168 S 0.0 3.6 2:43.72 httpd
7377 apache 20 0 358m 54m 6576 S 0.0 1.4 1:25.76 httpd
7692 apache 20 0 433m 129m 6588 S 0.0 3.4 1:20.64 httpd

[code]....

I'm really new to VPS's and plesk so I'm wondering what I can do to try and track down what is causing these high usage as I'm 100% certain the site was fine before. The server has default build both before and after the fail.

Server Information:
OSCentOS 6.5 (Final)
Panel version11.5.30 Update #47
2 Cores
4GB Ram

Are there any tools within plesk that I can use to see what is causing these issues? It's making the website load extremely slow.

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Jul 20, 2014

We are currently running plesk 11.5 and over the last few months, the apache memory usage has been very high. On investigation we have gone through the logs and we can't find a cause.

I can issue a service httpd restart and the memory drops for about 30 minutes and then we see the apache memory grow to almost 1.5 - 2GB. Why this keeps happening?

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Jul 16, 2009

I just got a new server Dual E5520 with 6GB RAM, SAS 15k rpm raid10. It's running well. However, the memory usage is just around 2.5GB, even when I have more traffic. Here is the kernel info

Quote:

# uname -a
Linux server2.[url]2.6.18-128.1.10.el5 #1 SMP Thu May 7 10:35:59 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

Any idea that we can put more content into memory?

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Jun 23, 2009

It seems that a user may get more percentage of memory purchased for real use. I've got a xen VPS which has access to all 8 CPU cores. Guess this is a good thing to be able to burst CPU resources

[xwu@atom ~]$ cat /proc/cpuinfo | grep processor | awk '{a++} END {print a}'
8

But this requires lots of kthread running to be able to access all CPU resources, which in turn consumes quite some memory, a valuable, limited resource on a small VPS instance.

[xwu@atom ~]$ cat /proc/meminfo | grep Mem
MemTotal: 524288 kB
MemFree: 276128 kB

The output above is grathered when almost no other services are running except sshd.

While XEN VPS surely consumes more memory than OVZ VPS, I would suggest the Xen VPS can be built in such a way less memory is required to just do the housekeeping.

Of course, that would imply careful provisioning, maybe less "overselling" for the sake of lack of a term. The bottom line is how we can reduce the memory usage, while ensure individual VPS instance can still have fair share of CPU if needed.

Is there anyway in the VPS kernel config which can disable access to certain CPU core, thus reducing the number of kthreads and etc?

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Dec 1, 2008

I do not know if i have problems with my vps but "top" output looks strange for me. It looks like apache processes have huge VIRT parameter and all processes have huge SWAP param.

My VPS 712 guaranteed and 1024 burstable. I'm running 10 virt hosts with very small traffic. Totally not more than 500 visits/day. Most of sites are static and only two are PHP.

Apache and PHP configuration are very standard.

Here is top output: ...

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Jul 30, 2007

this is my machine's vmstat result

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r b w swpd free buff cache si so bi bo in cs us sy id
1 1 0 1864 16352 34576 146252 0 3 541 106 146 142 6 23 71

I want to free some space

How can I do that?

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Nov 1, 2007

how much adding php to apache will increase memory usage on a VPS? This would be php5.

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Or can someone recommend a database design tool (I've used toad data modeler before) which I can use on my home pc to generate SQL statements for execution on the server (and please don't say notepad).

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Mar 10, 2007

We have a server that is rebooting, we saw that free memory reaches almost 0 before the server reboot.

i�m running a cpanel server on P4 3.6HT / 1GB RAM / load always under 1.0:

Apache
46.6 to 80 requests/sec - 183.7 kB/second - 4034 B/request

top - 11:07:15 up 21 min, 1 user, load average: 0.29, 0.38, 0.46
Mem: 1026348k total, 529632k used, 496716k free, 31148k buffers

Most processes are:
12239 nobody 15 0 49436 7324 3116 S 1 0.7 0:00.25 /usr/local/apache/bin/httpd -DSSL

Is the time to increase RAM server or would be a hardware problem?

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Those of you who work with shared hosting, how much memory per customer do you allow for PHP? What about for Ruby on Rails?

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Jan 2, 2007

I am trying to run tomcat on my linux server and I am getting memory allocation error. When I see check memory usage it is full, but when I check the cpu usage it show as this:

load average: 0.00, 0.00, 0.00

When I run top command, I found tis.

16003 root 19 19 5492 5492 5040 D N 0.7 0.6 0:00 0 pkgacct - triwaste
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2 root 9 0 0 0 0 SW 0.0 0.0 0:00 0 keventd
3 root 19 19 0 0 0 SWN 0.0 0.0 0:00 0 ksoftirqd_CPU0
4 root 9 0 0 0 0 SW 0.0 0.0 12:09 0 kswapd
5 root 9 0 0 0 0 SW 0.0 0.0 0:00 0 bdflush
6 root 9 0 0 0 0 SW 0.0 0.0 4:16 0 kupdated
7 root 9 0 0 0 0 DW 0.0 0.0 40:29 0 kjournald
384 root 9 0 0 0 0 SW 0.0 0.0 0:00 0 kjournald
385 root 9 0 0 0 0 SW 0.0 0.0 8:05 0 kjournald
387 root 9 0 0 0 0 SW 0.0 0.0 2:45 0 loop0
642 root 8 0 800 752 692 S 0.0 0.0 0:02 0 xinetd -stayalive -pidfile /var/run/xinetd.pid
653 root 9 0 1324 1168 1128 S 0.0 0.1 0:44 0 /usr/sbin/sshd
920 named 9 0 4012 3488 2240 S 0.0 0.3 0:00 0 /usr/sbin/named -u named
921 named 9 0 4012 3488 2240 S 0.0 0.3 0:19 0 /usr/sbin/named -u named
922 named 9 0 4012 3488 2240 S 0.0 0.3 3:49 0 /usr/sbin/named -u named
923 named 9 0 4012 3488 2240 S 0.0 0.3 0:04 0 /usr/sbin/named -u named
924 named 9 0 4012 3488 2240 S 0.0 0.3 1:07 0 /usr/sbin/named -u named
1252 root 8 0 928 616 564 S 0.0 0.0 0:10 0 crond
1260 root 9 0 5172 1436 1408 S 0.0 0.1 0:59 0 /usr/local/apache/bin/httpd -DSSL
1346 xfs 9 0 2528 680 656 S 0.0 0.0 0:00 0 xfs -droppriv -daemon
1355 daemon 9 0 556 540 500 S 0.0 0.0 0:00 0 /usr/sbin/atd
1552 root 18 19 11844 8740 7968 S N 0.0 0.9 35:28 0 cpanellogd - setting up logs for detail
1599 root 9 0 1008 876 876 S 0.0 0.0 0:00 0 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --pi
1630 mysql 9 0 70928 56M 53624 S 0.0 6.3 0:34 0 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql

When the memory usage 6.3 is what is it mean? Is it using 6.3% of the total memory?

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Mar 28, 2009

Am using Hypervm,my all vms are not using more than 512 MB memory but when i click on server as localhost the there is show maximum memory usage I have total 8 GB it always show 5-6 GB usage and never drop down, How can I fix this matters?

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Mar 23, 2009

I have a VPS with 384 MB RAM, with free about 100-120 MB. I've upgraded to 512 MB (to have some other features...). I notice that the memory usage is always about 250-300 MB. For example, now:

Code:
[root@host ~]# free -m
total used free shared buffers cached
Mem: 512 311 200 0 0 0
-/+ buffers/cache: 311 200
Swap: 0 0 0
But PHP tells "out of memory" in some tasks

The current PHP config is memory limit 192 MB (it was 96 MB, then I tried to increase).
[url]

Code:
Fatal error: Out of memory (allocated 19660800) (tried to allocate 39 bytes)
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Oct 20, 2009

I'm currently playing with my dedicated server, it isn't much but for learning purposes it's more than enough.

I have CentOS 5.3 installed on the server.

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Now my question is:

When server is running nothing but basic install memory comsumption is aroun 500-600 MB.

Today I have rsynced 11 GB of data from one of my VPSs to the ded server and the memory comsumption on the server sky rocketed to 2 GB, leaving only 56 Mb free.

Strange.. (for me)

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top - 02:01:38 up 31 days, 14:13, 0 users, load average: 0.00, 0.03, 0.07
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total used free shared buffers cached
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How much memory have I used?

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