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Old 07-29-2003, 11:23 AM   #1
fcalcada
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Registered: Jul 2003
Distribution: Red Hat 7.3
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Memory Management Problems...


Hello...

i'm looking for information regarding a certain (and so far unrecognizable) memory management error that occurs in a machine with Red Hat 7.3 installed and has 1GB of RAM.

I'm told that this machine acts as a server and, if it is not restarted once a week, if freezes up....

I've been trying to find information on similar problems... specially the memory management problems known to occur in machines wich have large amounts of RAM (over 1GB)

Thank you very much.
Fernando Calšada.
 
Old 07-29-2003, 11:36 AM   #2
jvds
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There isn't anything obvious from what you are saying. What is the server doing? Could it be that the process running has a memory leak?

Rus
 
Old 07-29-2003, 12:29 PM   #3
fcalcada
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that's just it....

the information i've been given is pretty much what i've described.....

i dont have access to the server... the only thing i know is:
- 1GB RAM installed....
- Server freezes if left running....
- Reboot once a week, and it works fine....

Solution presented:
recompile kernel for extended memory support....

(the catch is, i pretty sure that the 2.4 version of the RH Linux Kernel, should not have much trouble handling 1GB of ram...they have, however released in the distro CD, and alternate kernel 2.4.13-3bigmem, i thing wich is said to be more suitedto handle large amounts of RAM - over 4GB - in a server...)

now... it would be easier for me, if i knew what the damn problem is...maybe i could solve it with out having to recompile the kernel

sorry i can't give you any more info.... this is all i have...

Tks anyway
Fernando Calšada.

PS: BTW, i'm a newb at this whole Linux thing... did my first install a couple of weeks ago......i'm just trying to familiarize myself with it...so if my questions sound a bit obvious or missdirected...don't take it the wrong way... i just don't know much more...
 
Old 07-29-2003, 12:30 PM   #4
php
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I use to have problems with machines restarting like once a week or more noticibly randomly which also happened every 1-2 weeks and I finally narrowed the problem down to being hotplug barfing things up.. check it out, you should have no problem with 1gb of memory..
 
Old 07-29-2003, 12:34 PM   #5
fcalcada
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the reboot is not random, it's intentional...

the machine is shut down, ... then booted up again...manually

Tks
Fernando Calšada
 
Old 07-29-2003, 12:42 PM   #6
jvds
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Do you know what the server is doing? Email? Peoples websites?

Rus
 
Old 07-29-2003, 12:47 PM   #7
fcalcada
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Lotus Notes Server....
mail server.... user accounts....

don't know anything else...
 
Old 07-29-2003, 12:50 PM   #8
jvds
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What I suggest is to monitor memory/process usage over a period of time. Try getting the system every hour, using a cron job to run

ps -ef
free

This will show what is happening on a very basic level. I wouldn't be surpirsied if Domino had a memory leak whihc was causing the system to slow down

Rus
 
Old 07-29-2003, 06:30 PM   #9
homestead1000
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I added resin and jdk and caused my machine to act quite similar. I only had to reboot it daily until I scrubbed it and started over without those items.
 
Old 07-30-2003, 03:55 AM   #10
fcalcada
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So jvds..... your assumption is that this is a memory leak problem?

have you encoutered it before?

I'll look in to it in more detail, thanks for the advice, from you and from everyone... i'll post the results of the tests as soon as I have them...

Tks a LOT!!!
Fernando Calšada
 
Old 07-30-2003, 07:06 AM   #11
JZL240I-U
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I've heard that in some cases log files cause problems like yours. They fill their partition entirely and thus cause the system to freeze in the end. So you might want to check the growth of them during the week and see whether any partition gets too full over time ...
 
Old 07-30-2003, 10:32 AM   #12
fcalcada
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Hello again...

Here are some more details on the situation:

Equipment:
Red Hat 7.3 Box W/ 1GB Ram running Domino Lotus Server

Problem:
Eventualy if freezes up....

Solution so far:
If the machine is restarted once a week, problem never occurs.
If left functioning, it eventualy crashes...

Presented Alternate Solution:
Recompile Kernel, configuring ir to run with 1GB of RAM, since problem is said to be originated in a memory management deficiency of Red Hat Linux

I've tried hundreds of sources of information, but almost all of them are inconclusive or incomplete.....

My opinion.... Red 7.3 (Kernel 2.4.18-3) is perfectly capapable of handling 1GB of RAM.... w/o problems....could there be a bug in Domino?...

Moreover, is there any sotware I can use to detect a memoy leak in Domino?

Any feedback is apreciated...

Tks to everyone.
Fernando Calšada.

Last edited by fcalcada; 07-30-2003 at 10:35 AM.
 
  


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