Limiting Process Memory Usage
Feb 28, 2007
I've been unable to limit the size of a process to keep it from hosing a system. I've tried the following methods:
- RLimitMEM for just Apache (although I'd like this to apply to any process in the system)
- ulimit
- PAM limits.conf (/etc/security/limits.conf)
In theory, either ulimit or limits.conf should do the trick, but when I start up Apache and run a test script to build up some memory, it doesn't get killed off. Is there any way to do what I want? I'll even take kernel modification as an option. We're running CentOS 4.4, but I don't have a problem with swapping out for another kernel.
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Feb 22, 2007
Few of the processes are getting more meory usage and I checked by using top command.
It is displaying as 0.6% for each process. Does it mean that it is using 0.6% of the total memory?
How can I find exact memory usage?
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Sep 15, 2007
I have a VPS with 256MB ram. i want to limit mysql memory access. suppose i want that mysql should not use more than 128MB ram.
is this possible? if yes how?
is this possible for all other services too?
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Jan 21, 2008
i've been researching this but can't seem to find a decent solution.
basically trying to limit the cpu usage of a single domain, or limit accesses per hour if that's possible?
i tried adding an entry in /etc/security/limits.conf which restricts numproc to 2 and then down to 1, but it doens't seem to make any impact on the load. load of the server drops from about 1.5-2 down to 0.02 when this single site is suspended, and i can't have it run wild.
ideally would like a message that says something along the lines of server is too busy... trying again in 5 seconds or something along those lines?
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May 11, 2008
how to know which processes are consuming the most memory?
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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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Oct 23, 2007
Yet another topic about process/memory management : )
I have a 256 RAM VPS and I need to free up more memory, Im using cpanel and when i use the "top" command, those are the major memory consumers!
PS.: I removed some of the list cause I know i really need them
21635 root 16 0 20888 10m 1316 S 0 1.0 0:01.73 cpsrvd-ssl
13983 root 20 0 14644 8780 348 S 0 0.8 0:00.00 cpdavd
13994 root 34 19 9956 7376 1876 S 0 0.7 0:01.04 cpanellogd
3835 root 15 0 6592 5028 1192 S 0 0.5 0:00.01 chkservd
26595 root 17 0 6652 5020 2816 S 0 0.5 0:00.18 authProg
13911 mailnull 16 0 7664 4972 1544 S 0 0.5 0:00.14 eximstats
13993 root 15 0 6228 4436 1112 S 0 0.4 0:00.03 cpbandwd
13764 root 16 0 3524 1496 628 S 0 0.1 0:00.35 antirelayd
13692 mailnull 16 0 7404 1204 808 S 0 0.1 0:00.22 exim
13698 mailnull 20 0 7404 1144 756 S 0 0.1 0:00.00 exim
18140 mailnull 20 0 7404 1140 752 S 0 0.1 0:00.00 exim
So, my basic question is, which of them I donīt need? SOme of them I know what is it but still have some questions...
1-cpsrvd-ssl , i know this means someone(me) is connected to cpanel, but even if I log out the process stills there, is that normal ?
2-authProg , sometimes there are a lot of those process running, what is that? is that normal ?
3-exim, 3 process running, is that normal ? exim is better than sendmail ?
4-After those questions, which process am I able to drop(and how?) - I only need email forwarding(that is already working), smtp, mysql(already working too), and tomcat server.
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Mar 20, 2008
I have been looking everywhere for a program that can monitor a process's CPU usage and if it exceeds a certain percentage for a given amount of time, kill the process.
Everywhere I look, it's either doesn't kill automatically, or is for Linux. Can anyone recommend me a program that can do this for Windows 2003?
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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
procs memory swap io system cpu
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.
I need it to use phpMyAdmin to manage my MySQL database (actual site is running off tomcat but jspmyadmin won't work for some reason).
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.
iīm 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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Aug 30, 2007
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
1 root 8 0 476 432 412 S 0.0 0.0 0:35 0 init [3]
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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Dec 30, 2008
I was just wondering about DA memory load. Like CPANEL load around 300mb and LXADMIN about 20mb. I was going to get VPS with 256 only to host 40-50 church sites with just static html, not dynamic or anything. Greatly appreciated with your input. I'm still learning all of this
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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:
<b>Fatal error</b>: Out of memory (allocated 19660800) (tried to allocate 39 bytes)
in <b>##hidden##/includes/joomla.php</b> on line <b>3041</b><br />
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Nov 6, 2009
Does anyone know if MySQL 5.1 or 5.0 uses less memory than 4.1 does?
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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.
It's Intel Atom 330 with 2 GB RAM.
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)
And there was almost no (110 Kb) swap usage.
Now the memory comsumption is ~ 1.2 GB.
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Jun 10, 2009
Since a short while back my server memory usage is 100%. The amount of
visitors decreased so the memory should be lower in consumption than before.
I suspect a newly installed script could have bugs or misuse of the
server by hackers. I don't know how to see on the server what script or
what part makes the memory use so high. I see Apache is very high but
I'm on VPS.
Technical data........
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Jul 13, 2009
My managed dedicated server at 1and 1 has very low load, but quite slow, I was trying to figure out the reason. The top and free command ( I run at midnight without traffic), here is the result. Can anybody tell me if the memory usage is normal, anything suspicious. Look like the memory usage is high even with no traffic, but 1and 1 support say that's because it's reserved for cache.
top - 02:01:38 up 31 days, 14:13, 0 users, load average: 0.00, 0.03, 0.07
Tasks: 6 total, 2 running, 4 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1017068k total, 972620k used, 44448k free, 169564k buffers
Swap: 514064k total, 26076k used, 487988k free, 509580k cached
total used free shared buffers cached
Mem: 1017068 972656 44412 0 169600 509612
-/+ buffers/cache: 293444 723624
Swap: 514064 26076 487988
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Mar 23, 2009
So I just need some clarification:
Code:
-bash-3.2$ free -m
total used free shared buffers cached
Mem: 2000 1131 869 0 219 513
-/+ buffers/cache: 398 1602
Swap: 4094 0 4094
How much memory have I used?
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Mar 16, 2009
I have a VPS w/ KnownHost on CPanel and 256mb of RAM (I know, bad mix). It's the newer CPanel that is VPS optimized.
There are 3 websites on it and get < 500 hits/day total on average.
Right now I am at 128mb used/127mb free. It seems higher than it should/needs to be.
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Oct 11, 2009
I have a Drupal site with around 1000 visitors/day on a basic VPS. (HyperVM with lxadmin) Burstable RAM is 384MB and my site reachs it.
is this normal for a site like this?
anything that I can do to decrease the memory usage?
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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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Jul 21, 2008
I have a dedicated server with 2 GB of RAM. I am concerned with my server's memory usage when I am currently not running many applications.
[root@digm1 ~]# free -m
total used free shared buffers cached
Mem: 1947 1896 50 0 106 1579
-/+ buffers/cache: 210 1736
Swap: 2047 0 2047
It tells me that I only have 50 MB of memory left and it drops down to ~20 MB after Apache has been running for a while. Once it runs out of that 20 MB I will start swapping right? I have also run this command and do not see any process taking up anywhere close to what is being reported:
ps -eo pid,ppid,rss,vsize,pcpu,pmem,cmd -ww --sort=pid
No process is using more than 1.5% memory and only 3 use this much.
Is Linux caching memory which will be used after I run out?
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Nov 19, 2008
I have a VPS with 512 MB ram. I have 6 sites hosted on my VPS, of which 3 contains only static pages. My site is not very traffic heavy. Infact I moved to my VPS only 3 months back, until then it was running on a shared server with no problem.
But still, I am always running out of RAM. I have upgraded my account to 512 MB ram from 256MB because of this. Can anyone please tell me how I can find out what is the cause of this excessive memory usage? On rebooting my server, the RAM usage goes down to about 250MB.
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Jun 10, 2008
i order the latest plan of vps in some company, and got 898MB of dedicated memory, but as you can see in memory usage, how come my memory only 23mb(free usage) i just reboot and memory usage only 23mb, thats why my website taking so long to open other page.
is it my mistake?(im running forum,but only 2 users currently online, and not opening other website) or is it the company server that took somany client.
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Mar 6, 2007
Currently i have a small server with 512 Mb of ram i doing some minor hosting..
sometimes..my free memory is only left with 15 mb..is there a concern down here?
is there anyway i can find out what are using up my memory..? And should i just upgrade to 1Gb instead?
Somtimes my mail queue ..will also take up like 20 to 30 mb of memory as they keep on trying to resend themself
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Jul 21, 2008
My mysql is using alot of memory although there is not much data into the mysql tables.
I tried to control mysql usage by editing my.cnf file but that didnt help.
Which variables should I edit in my.cnf to keep mysql using low memory?
I edited sort_buffer_size, key_buffer_size but that didnt help much. It uses alot of per-thread memory as well.
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