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AleXxiO
Feb 12 2008, 01:50 PM
hi, i have this hw with mandriva and i noticed that i configured bad my webserver... it's always quite without memory... what do you think about it?
CODE
Linux localhost 2.6.22.12-server-1mdv #1 SMP Tue Nov 20 09:35:09 EST 2007 i686 Pentium III (Katmai) GNU/Linux
cpu MHz         : 451.044
cache size      : 512 KB

free:
             total       used       free     shared    buffers     cached
Mem:        158604     156024       2580          0       1476     103664
-/+ buffers/cache:      50884     107720
Swap:       457812        108     457704

[alexxio@localhost ~]$ ps aux | grep httpd | wc -l
10

[alexxio@localhost ~]$ ps aux | grep mysqld | wc -l
4


(i think these are too much forks, right?)

this is the complete list of running processes with ps aux
CODE
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.0  0.3   1648   536 ?        Ss   Feb10   0:04 init [3]
root         2  0.0  0.0      0     0 ?        S<   Feb10   0:00 [kthreadd]
root         3  0.0  0.0      0     0 ?        S<   Feb10   0:00 [migration/0]
root         4  0.0  0.0      0     0 ?        S<   Feb10   0:00 [ksoftirqd/0]
root         5  0.0  0.0      0     0 ?        S<   Feb10   0:16 [events/0]
root         6  0.0  0.0      0     0 ?        S<   Feb10   0:00 [khelper]
root        29  0.0  0.0      0     0 ?        S<   Feb10   0:00 [kblockd/0]
root        30  0.0  0.0      0     0 ?        S<   Feb10   0:00 [kacpid]
root        31  0.0  0.0      0     0 ?        S<   Feb10   0:00 [kacpi_notify]
root        94  0.0  0.0      0     0 ?        S<   Feb10   0:00 [kseriod]
root       111  0.0  0.0      0     0 ?        S    Feb10   0:00 [pdflush]
root       113  0.0  0.0      0     0 ?        S<   Feb10   0:02 [kswapd0]
root       114  0.0  0.0      0     0 ?        S<   Feb10   0:00 [aio/0]
root       740  0.0  0.0      0     0 ?        S<   Feb10   0:00 [kpsmoused]
root       770  0.0  0.0      0     0 ?        S<   Feb10   0:04 [kjournald]
root       907  0.0  0.4   2016   660 ?        S<s  Feb10   0:01 /sbin/udevd -d
root      1719  0.0  0.0      0     0 ?        S<   Feb10   0:00 [ksuspend_usbd]
root      1723  0.0  0.0      0     0 ?        S<   Feb10   0:00 [khubd]
root      1757  0.0  0.0      0     0 ?        S<   Feb10   0:00 [kgameportd]
root      1928  0.0  0.0      0     0 ?        S<   Feb10   0:00 [kondemand/0]
root      1979  0.0  0.0      0     0 ?        S<   Feb10   0:00 [ata/0]
root      1980  0.0  0.0      0     0 ?        S<   Feb10   0:00 [ata_aux]
root      2053  0.0  0.0      0     0 ?        S<   Feb10   0:00 [kjournald]
root      2054  0.0  0.0      0     0 ?        S<   Feb10   0:02 [kjournald]
daemon    2435  0.0  0.1   1680   240 ?        Ss   Feb10   0:00 /usr/sbin/atd
root      2442  0.0  0.3   1704   628 ?        Ss   Feb10   0:01 syslogd -m 0
root      2523  0.0  0.2   1652   404 ?        Ss   Feb10   0:00 klogd -x
71        2564  0.0  0.4   2304   704 ?        Ss   Feb10   0:00 dbus-daemon --s
root      2588  0.0  0.6   2720  1000 ?        Ss   Feb10   0:00 crond -p
root      2698  0.0  1.1   7512  1764 ?        Ssl  Feb10   0:00 console-kit-dae
root      2719  0.0  0.2   3068   468 ?        S    Feb10   0:00 /usr/sbin/smart
root      2897  0.0  0.3   1640   492 ?        Ss   Feb10   0:00 /usr/sbin/acpid
81        2938  0.0  2.1   5508  3484 ?        Ss   Feb10   0:03 hald
root      2939  0.0  0.5   3148   908 ?        S    Feb10   0:00 hald-runner
root      3057  0.0  0.6   3248   984 ?        S    Feb10   0:00 hald-addon-inpu
81        3108  0.0  0.4   2008   792 ?        S    Feb10   0:00 hald-addon-acpi
bin       3376  0.0  0.2   1756   452 ?        Ss   Feb10   0:00 portmap
root      3402  0.0  0.5   2280   804 ?        Ss   Feb10   0:00 xinetd -stayali
avahi     3436  0.0  0.8   2696  1404 ?        Ss   Feb10   0:00 avahi-daemon: r
root      3439  0.0  0.4   1828   692 ?        Ss   Feb10   0:00 rpc.statd
xfs       3455  0.0  1.5   4768  2452 ?        Ss   Feb10   0:00 xfs -port -1 -d
root      3517  0.0  0.0      0     0 ?        S    Feb10   0:05 [pdflush]
root      3524  0.0  0.2   5212   448 ?        Ss   Feb10   0:00 saslauthd -a pa
root      3539  0.0  0.4   5104   728 ?        Ss   Feb10   0:00 /usr/sbin/sshd
root      3711  0.0  0.1   5212   232 ?        S    Feb10   0:00 saslauthd -a pa
root      3712  0.0  0.1   5212   228 ?        S    Feb10   0:00 saslauthd -a pa
root      3713  0.0  0.1   5212   228 ?        S    Feb10   0:00 saslauthd -a pa
root      3714  0.0  0.1   5212   228 ?        S    Feb10   0:00 saslauthd -a pa
nobody    3730  0.0  1.7   6868  2744 ?        Ss   Feb10   0:07 proftpd: (accep
root      3736  0.0  1.8  12412  2916 ?        Ss   Feb10   0:00 smbd -D
root      3749  0.0  4.1  20816  6532 ?        Ss   Feb10   0:07 /usr/sbin/httpd
root      3753  0.0  0.9   7320  1476 ?        Ss   Feb10   0:04 nmbd -D
root      3760  0.0  0.7  12412  1160 ?        S    Feb10   0:00 smbd -D
apache    3769  0.0  3.2  20892  5088 ?        S    Feb10   0:00 /usr/sbin/httpd
apache    3770  0.0  2.7  20892  4308 ?        S    Feb10   0:00 /usr/sbin/httpd
apache    3771  0.0  3.1  20892  5068 ?        S    Feb10   0:00 /usr/sbin/httpd
apache    3772  0.0  2.7  20892  4312 ?        S    Feb10   0:00 /usr/sbin/httpd
apache    3773  0.0  3.1  20892  5060 ?        S    Feb10   0:00 /usr/sbin/httpd
apache    3774  0.0  3.1  20892  5060 ?        S    Feb10   0:00 /usr/sbin/httpd
apache    3775  0.0  3.1  20892  5056 ?        S    Feb10   0:00 /usr/sbin/httpd
apache    3776  0.0  2.7  20892  4312 ?        S    Feb10   0:00 /usr/sbin/httpd
root      3833  0.0  0.0      0     0 ?        S<   Feb10   0:00 [kauditd]
mysql     4101  0.0  0.3   6452   492 ?        Ss   Feb10   0:00 /usr/sbin/mysql
mysql     4103  0.0  0.6  14808  1024 ?        Sl   Feb10   0:40 /usr/sbin/mysql
mysql     4109  0.1  8.8 111352 14036 ?        Sl   Feb10   5:57 /usr/sbin/mysql
root      4140  0.0  0.2   1632   432 tty1     Ss+  Feb10   0:00 /sbin/mingetty
root      4738  0.0  0.5   3760   804 ?        Ss   Feb10   0:00 SCREEN
root      4739  0.0  1.0   3904  1672 pts/1    Ss+  Feb10   0:00 /bin/bash
alexxio   6682  0.0  0.5   3760   860 ?        Ss   Feb10   0:00 SCREEN
alexxio   6683  0.0  1.2   4440  1980 pts/2    Ss+  Feb10   0:00 /bin/bash
root      8139  0.0  1.0   6660  1740 ?        SNs  Feb11   0:10 sendmail: accep
mail      8156  0.0  0.7   6532  1224 ?        SNs  Feb11   0:00 sendmail: Queue
alexxio  15695  0.0  0.5   3764   840 ?        Ss   12:43   0:01 SCREEN
alexxio  15696  0.0  1.2   4424  1952 pts/3    Ss+  12:43   0:00 /bin/bash
root     16117  0.0  1.1   7732  1888 ?        Ss   14:32   0:00 sshd: alexxio [
alexxio  16123  0.0  0.7   7768  1212 ?        S    14:34   0:00 sshd: alexxio@p
alexxio  16124  0.0  1.2   4384  1916 pts/0    Ss   14:34   0:00 -bash
alexxio  16728  0.0  0.5   2416   888 pts/0    R+   14:54   0:00 ps aux

can you help me boosting it?
AleXxiO
Feb 14 2008, 09:50 AM
up!! nobody?
ianw1974
Feb 14 2008, 12:06 PM
Looks perfectly normal to me. A Linux system will use all the memory, and this shows that the system is configured properly. I don't see any problems here. You can see this by the fact that swap is hardly being used at all. It's normal to see a little usage which is why you see 108 being used.

I would only start to worry if all your swap starts to get used. Then I would just simply suggest - install some more memory.

So no need to worry about it.
AleXxiO
Feb 14 2008, 12:09 PM
tnx... so there is nothing to do to make it faster or so?
ianw1974
Feb 14 2008, 12:23 PM
Some little tweaks you can do is disable unwanted tty's in /etc/inittab. Here is a sample:

CODE
1:2345:respawn:/sbin/mingetty tty1
2:2345:respawn:/sbin/mingetty tty2
#3:2345:respawn:/sbin/mingetty tty3
#4:2345:respawn:/sbin/mingetty tty4
#5:2345:respawn:/sbin/mingetty tty5
#6:2345:respawn:/sbin/mingetty tty6


the # at the beginning of the lines comment them out. Just be careful that you comment the right lines, and not the runlevels! As you see above I only have two tty's enabled, and thus I free up some memory. You can also stop the system from going to swap too easily by editing /etc/sysctl.conf and adding:

CODE
vm.swappiness = 10


and then execute:

CODE
sysctl -p


and check by doing:

CODE
cat /proc/sys/vm/swappiness


and it should report 10. Other than that, you need to disable services that you are not using. Take a look at:

CODE
chkconfig --list | grep :on


see what is enabled, and what you are using from this list. Then we can take a look at the rest and decide whether it is safe to disable them or not.
Steve Scrimpshire
Mar 7 2008, 04:44 AM
QUOTE
total used free shared buffers cached
Mem: 158604 156024 2580 0 1476 103664
-/+ buffers/cache: 50884 107720
Swap: 457812 108 457704


In case ianw wasn't completely understood, when Linux finishes using memory, it caches it instead of returning it to 'free' status, so if you look at your output of free:

free: 2580
cached: 103664

So, you actually have 2580 + 103664 kbs of free RAM or 106244 kb free, which is 66.99% free. Not too shabby for a box running apache and mysql.
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