Iīve got a problem with the RAM memory in a linux server. It seems that a proces is leeking memory, but I canīt find out what program causes this.
Iīve got about 190 MB In mB in the linux box, and always after a few days 90% is in use... Thatīs about 175 MB!!
I think this is a quite a lot! (when I compare it whit other linux boxes, which are doing a lot more) Because the box is doing nothing heavy, it running courier IMAP + Pop3 but the only one who uses this is me (a few times (say 10) a day).. itīs also running apache, itīs serving 10 clients a day, so itīs not very much... The load is always about 0.0X
With top or ps I canīt find out, what causes this... Can anyone give me some advise, what to do? how can I find out what causes this high memory usage.
Hope you can help me...
- Andree Here is some aditional information (/proc/meminfo & ps aux & top)
> Iīve got a problem with the RAM memory in a linux server. > It seems that a proces is leeking memory, but I canīt find out what > program causes this.
> Iīve got about 190 MB In mB in the linux box, and always after a few > days 90% is in use... > Thatīs about 175 MB!!
> I think this is a quite a lot! (when I compare it whit other linux > boxes, which are doing a lot more) > Because the box is doing nothing heavy, it running courier IMAP + Pop3 > but the only one who uses this is me (a few times (say 10) a day).. > itīs also running apache, itīs serving 10 clients a day, so itīs not > very much... > The load is always about 0.0X
> With top or ps I canīt find out, what causes this... > Can anyone give me some advise, what to do? > how can I find out what causes this high memory usage.
> Hope you can help me...
And where is now your problem? Is the system slowing down, responding sluggishly or anything like that? Or are you just thinking that you now better how to manage RAM than Linux does?
I would like to know what this causes... This system has to replace an older system, because the older system is having problems with load... Itīs an webserver, mailserver and firewall/router.
Iīm now testing the system, but i think a may be expecting problems with this... also because the old system only has 64 MB, and alway has an memory usage between 50MB - 100 MB....
So I would like to find out, what the cause of this big memory usage is, and why the older system doesnīt has this problem... So iīm looking for a way to find out where this memory has gone, because with a top or ps I only find about 30% of the memory matching with a PID where is the other memory usage?
Hope you can help me.
Thanks in advance Andree
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"Ralf Bader" <rjba...@t-online.de> wrote in message
> > Iīve got a problem with the RAM memory in a linux server. > > It seems that a proces is leeking memory, but I canīt find out what > > program causes this.
> > Iīve got about 190 MB In mB in the linux box, and always after a few > > days 90% is in use... > > Thatīs about 175 MB!!
> > I think this is a quite a lot! (when I compare it whit other linux > > boxes, which are doing a lot more) > > Because the box is doing nothing heavy, it running courier IMAP + Pop3 > > but the only one who uses this is me (a few times (say 10) a day).. > > itīs also running apache, itīs serving 10 clients a day, so itīs not > > very much... > > The load is always about 0.0X
> > With top or ps I canīt find out, what causes this... > > Can anyone give me some advise, what to do? > > how can I find out what causes this high memory usage.
> > Hope you can help me...
> And where is now your problem? Is the system slowing down, responding > sluggishly or anything like that? Or are you just thinking that you now > better how to manage RAM than Linux does?
On Fri, 20 Sep 2002, @ndree wrote: > I would like to know what this causes... > This system has to replace an older system, because the older system is > having problems with load... > Itīs an webserver, mailserver and firewall/router.
> Iīm now testing the system, but i think a may be expecting problems with > this... > also because the old system only has 64 MB, and alway has an memory usage > between 50MB - 100 MB....
> So I would like to find out, what the cause of this big memory usage is, and > why the older system doesnīt has this problem... > So iīm looking for a way to find out where this memory has gone, because > with a top or ps I only find about 30% of the memory matching with a PID > where is the other memory usage?
@ndree wrote: > I would like to know what this causes... > This system has to replace an older system, because the older system > is having problems with load... > Itīs an webserver, mailserver and firewall/router.
> Iīm now testing the system, but i think a may be expecting problems > with this... > also because the old system only has 64 MB, and alway has an memory > usage between 50MB - 100 MB....
> So I would like to find out, what the cause of this big memory usage > is, and why the older system doesnīt has this problem... > So iīm looking for a way to find out where this memory has gone, > because with a top or ps I only find about 30% of the memory matching > with a PID where is the other memory usage?
> Hope you can help me.
Normally the amount of memory in use is increasing until practically all RAM is used. This is not a problem, it is a habit of Linux. How fast this happens depends on cron jobs, among other things. If you want to test the system, start, stop and restart a couple of memory intensive processes. When you restart something like Mozilla it comes up much faster if the process image is still in cache. Cache memory will be used for better purposes any time the need arises.
Rather than waste unused memory Linux tends to use it for disk buffering. If you need it for running programs it will be reclaimed but its better to have a lot of memory saving you having to go to disk for data than just have it sitting empty.
> Iīve got a problem with the RAM memory in a linux server. > It seems that a proces is leeking memory, but I canīt find out what program > causes this.
> Iīve got about 190 MB In mB in the linux box, and always after a few days > 90% is in use... > Thatīs about 175 MB!!
> I think this is a quite a lot! (when I compare it whit other linux boxes, > which are doing a lot more) > Because the box is doing nothing heavy, it running courier IMAP + Pop3 > but the only one who uses this is me (a few times (say 10) a day).. > itīs also running apache, itīs serving 10 clients a day, so itīs not very > much... > The load is always about 0.0X
> With top or ps I canīt find out, what causes this... > Can anyone give me some advise, what to do? > how can I find out what causes this high memory usage.
> Hope you can help me...
> - > Andree > Here is some aditional information (/proc/meminfo & ps aux & top)
"@ndree" <And...@nospam-Toonk.nl>, In a message on Fri, 20 Sep 2002 22:26:18 +0200, wrote :
"> I would like to know what this causes... "> This system has to replace an older system, because the older system is "> having problems with load... "> Itīs an webserver, mailserver and firewall/router. "> "> Iīm now testing the system, but i think a may be expecting problems with "> this... "> also because the old system only has 64 MB, and alway has an memory usage "> between 50MB - 100 MB.... "> "> So I would like to find out, what the cause of this big memory usage is, and "> why the older system doesnīt has this problem... "> So iīm looking for a way to find out where this memory has gone, because "> with a top or ps I only find about 30% of the memory matching with a PID "> where is the other memory usage?
Most of the memory usage is in disk cache buffers. This memory is not being used by some process, but by the kernel to store recent and frequently accessed disk blocks. This is normal. The system with less memory had a smaller disk cache.
What is happening is this: about 170meg worth of your most actively accessed web pages are in RAM and are being accessed from RAM, rather than via disk I/O.
You don't have a problem or a memory leak. If/When some process needs memory for some activity, the disk cache blocks will be cycled into the virtual memory needed by the process(es) that need RAM.
Linux's memory management does not 'waste' available RAM. If processing does not need RAM for process address space, the memory is used for a disk block cache and for disk buffering. *THIS IS NORMAL.* There is *NOTHING* wrong with your system.
"> "> Hope you can help me. "> "> Thanks in advance "> Andree "> "> "> < "> "Ralf Bader" <rjba...@t-online.de> wrote in message "> news:amfug4$kpd$00$1@news.t-online.com...
"> > @ndree wrote:
"> > "> > > Hello everyone, "> > > "> > > Iīve got a problem with the RAM memory in a linux server. "> > > It seems that a proces is leeking memory, but I canīt find out what "> > > program causes this. "> > > "> > > Iīve got about 190 MB In mB in the linux box, and always after a few "> > > days 90% is in use... "> > > Thatīs about 175 MB!! "> > > "> > > I think this is a quite a lot! (when I compare it whit other linux "> > > boxes, which are doing a lot more) "> > > Because the box is doing nothing heavy, it running courier IMAP + Pop3 "> > > but the only one who uses this is me (a few times (say 10) a day).. "> > > itīs also running apache, itīs serving 10 clients a day, so itīs not "> > > very much... "> > > The load is always about 0.0X "> > > "> > > With top or ps I canīt find out, what causes this... "> > > Can anyone give me some advise, what to do? "> > > how can I find out what causes this high memory usage. "> > > "> > > Hope you can help me... "> > "> > "> > And where is now your problem? Is the system slowing down, responding "> > sluggishly or anything like that? Or are you just thinking that you now "> > better how to manage RAM than Linux does? "> > "> > R.B. "> "> ">
