Re: Heavy load of graphics

Jim Nelson Thu, 07 Oct 2004 18:47:34 -0700

Ankit Jain wrote:

thanks a lot for help

but at this moment i am trying to find out what
services i should stop with this redhat-config service

Pretty much anything you aren't going to use - if it's a desktop machine, for example, you don't need sendmail running, for example. As I mentioned before,

   The only critical services controlled by this are network, syslog,
   xinetd, and nfslock (if you are using NFS). Do not disable those unless
   you know what you're doing it for. iptables is the firewall control
   (only disable if you are in a very well protected network).

and also i am confused in 1 more topic. top shows a
col on priority under PRI and also ps -Al shows a col
of priority i.e PRI what is the difference b/w both
becaz both shows different values

I'm not sure what the PRI column in "ps -Al" is bringing up - it's definitely not System V or BSD priority - I think it might be the actual kernel scheduler priority, whereas top and "ps al" show standard BSD-style priorities.

Someone else have more info?

rest inline
--- Jim Nelson <[EMAIL PROTECTED]> wrote:
Ankit Jain wrote:
thanks
this is the output
i am using redhat linux 9.0
"I know Red Hat has a lot of standard daemons
(PCMCIA,

ISDN, etc) that are started by default - have you

used
chkconfig or redhat-config-services to shut off
unneded services?" as u said...how to do this. i am
intrested in closing these services
thanks again
Easiest way to do this is to start an xterm, su to root, and type "redhat-config-services &". That will give you a GUI to select the services you wish to run. Depending on how much you selected when installing, it could be quite a bit.

Runlevel 3 is the Red Hat standard for booting into command-line mode, and runlevel 5 is the standard graphical login level.

The only critical services controlled by this are network, syslog, xinetd, and nfslock (if you are using NFS). Do not disable those unless you know what you're doing it for. iptables is the firewall control (only disable if you are in a very well protected network).
do u know any document to know all this?

Some is experience (killed my first box more times than I care to admit), and most of it came from a book I bought that came with RH9. Each service listed is actually a reference to a set of scripts in /etc/rc.d/init.d - Red Hat-based distros use System V-style initialization, with different runlevels for different functionality.

It takes some research, sometimes, to understand what each service mentioned does. Honestly, a dead-tree book or 20 is a great resource - especially when booting off a rescue disk and trying to remember what you need to do to fix your system.

Most everything else can be turned off.
[EMAIL PROTECTED] ankit]$ cat /proc/meminfo total: used: free: shared: buffers: cached: Mem: 120741888 118902784 1839104 0

1695744
74162176
Swap: 534601728 69509120 465092608
MemTotal:       117912 kB
MemFree:          1796 kB
MemShared:           0 kB
Buffers:          1656 kB
Cached:          36536 kB
SwapCached:      35888 kB
Active:          65144 kB
ActiveAnon:      37092 kB
ActiveCache:     28052 kB
Inact_dirty:      4852 kB
Inact_laundry:    6728 kB
Inact_clean:      1068 kB
Inact_target:    15556 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:       117912 kB
LowFree:          1796 kB
SwapTotal:      522072 kB
SwapFree:       454192 kB
128 MB RAM is marginal for using KDE or Gnome on RH9. You can do it (that's all I had on my first Linux box) but it's a pig.

You've got almost 70 MB in swap - over 30% of your total process memory. BTW - what kind of computer is it? If it's not some oddball hardware, your best solution is some RAM. 256 MB is enough to make X happy.
no X takes more than 70 % of memory with a system with
512 Mb of RAM i had seen that
and also as calculated it shows tyhat system uses
around 99Mb of RAM but it says only 2Mb is free? what
else is using that memory?


The filesystem cache.  From my machine:

[EMAIL PROTECTED] c]$ cat /proc/meminfo
MemTotal:       905280 kB
MemFree:         46700 kB
Buffers:        110792 kB
Cached:         267252 kB
SwapCached:         24 kB
Active:         412068 kB
Inactive:       143296 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:       905280 kB
LowFree:         46700 kB
SwapTotal:     1048816 kB
SwapFree:      1048728 kB
Dirty:              20 kB
Writeback:           0 kB
Mapped:         227936 kB
Slab:           292576 kB
Committed_AS:   313896 kB
PageTables:       2048 kB
VmallocTotal:   122840 kB
VmallocUsed:      3520 kB
VmallocChunk:   118236 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     4096 kB

This is from a 2.6 kernel, so a few things might be a bit different, but the general scheme is the same. Notice over 350 MB are consumed by buffers and the cache - but let me go and start GIMP and open a whole bunch of high-resolution pictures and I get:

[EMAIL PROTECTED] c]$ cat /proc/meminfo
MemTotal:       905280 kB
MemFree:          7280 kB
Buffers:         44084 kB
Cached:         263280 kB
SwapCached:        148 kB
Active:         511560 kB
Inactive:        96392 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:       905280 kB
LowFree:          7280 kB
SwapTotal:     1048816 kB
SwapFree:      1046204 kB
Dirty:             760 kB
Writeback:           0 kB
Mapped:         370692 kB
Slab:           278784 kB
Committed_AS:   445752 kB
PageTables:       2524 kB
VmallocTotal:   122840 kB
VmallocUsed:      3520 kB
VmallocChunk:   118236 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     4096 kB

Notice how the buffer memory consumption is cut in half? I've still got 7 MB free memory - Linux tries to keep some memory free at all times to prevent a machine from thrashing itself to death. Notice also that the active memory count went up - and I actually had some stuff moved to my disk swap space.

Now, my system responsiveness is not hindered at all - even with 20 pictures open in the GIMP.

Let's put the smackdown on this thing and open 120 pictures at 14.7 MB each.

MemTotal:       905280 kB
MemFree:          7412 kB
Buffers:          1404 kB
Cached:          73284 kB
SwapCached:     102004 kB
Active:         776724 kB
Inactive:        85120 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:       905280 kB
LowFree:          7412 kB
SwapTotal:     1048816 kB
SwapFree:       622796 kB
Dirty:             604 kB
Writeback:           0 kB
Mapped:         777052 kB
Slab:            23984 kB
Committed_AS:  1250072 kB
PageTables:       3308 kB
VmallocTotal:   122840 kB
VmallocUsed:      3520 kB
VmallocChunk:   118236 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     4096 kB

Notice 400 MB swapped to disk, the buffers have dwindled to less than 1% of the consumption of an unloaded system, and the I/O cache is 25% of an unloaded system. There is noticable lag when switching between workspaces now.

That's where the extra memory is going.

thanks
ankit
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Re: Heavy load of graphics

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