Hi all,
Totally off topic question but I guess here are at least 1 person with the right answer.
On my CentOS server I have 2 GB memory, however hobbit shows me that the used memory is slowly being used and never freed. How can I determine which application has the mem leak ? Doing a lot of ps commands only produces a list of processes with less than 1% mem usage.
TIA
/Thomas
Thomas a écrit :
Hi all,
Totally off topic question but I guess here are at least 1 person with the right answer.
On my CentOS server I have 2 GB memory, however hobbit shows me that the used memory is slowly being used and never freed. How can I determine which application has the mem leak ? Doing a lot of ps commands only produces a list of processes with less than 1% mem usage.
Hi
can you run that :
$ free -m total used free shared buffers cached Mem: 91 85 6 0 28 23 -/+ buffers/cache: 34 57 Swap: 192 85 107
On this machine, memory used by applications is only 34 Mb
--
Frédéric Mangeant
Steria EDC Sophia Antipolis
Hi Thomas,
to find the application which consumes the mem, just start "top" and sort by mem with "M".
regards, Pascal
-----Ursprüngliche Nachricht----- Von: Thomas [mailto:tlp-hobbit at holme-pedersen.dk] Gesendet: Mittwoch, 23. Mai 2007 09:06 An: hobbit at hswn.dk Betreff: [hobbit] OT: CentOS mem usage.
Hi all,
Totally off topic question but I guess here are at least 1 person with the right answer.
On my CentOS server I have 2 GB memory, however hobbit shows me that the used memory is slowly being used and never freed. How can I determine which application has the mem leak ? Doing a lot of ps commands only produces a list of processes with less than 1% mem usage.
TIA
/Thomas
To unsubscribe from the hobbit list, send an e-mail to hobbit-unsubscribe at hswn.dk
Hi Pascal,
But I have tried this, and it gives me the application which has only 1.8% of the memory. I need an overview of each process and what memory is actually used by it. If its a memory leak will the original process still own the memory ?
I am affraid I am not a linux guru so I dont know how linux manages the memory. Ie if a applcation frees some memory will the manager only release it after some time in case the application need some memory soon, or will it keep it until all available memory is used and only then start to free unused memory ?
Regards, Thomas
Pascal Lehnert wrote:
Hi Thomas,
to find the application which consumes the mem, just start "top" and sort by mem with "M".
regards, Pascal
-----Ursprüngliche Nachricht----- Von: Thomas [mailto:tlp-hobbit at holme-pedersen.dk] Gesendet: Mittwoch, 23. Mai 2007 09:06 An: hobbit at hswn.dk Betreff: [hobbit] OT: CentOS mem usage.
Hi all,
Totally off topic question but I guess here are at least 1 person with the right answer.
On my CentOS server I have 2 GB memory, however hobbit shows me that the used memory is slowly being used and never freed. How can I determine which application has the mem leak ? Doing a lot of ps commands only produces a list of processes with less than 1% mem usage.
TIA
/Thomas
To unsubscribe from the hobbit list, send an e-mail to hobbit-unsubscribe at hswn.dk
To unsubscribe from the hobbit list, send an e-mail to hobbit-unsubscribe at hswn.dk
On Wed, May 23, 2007 at 12:34:11PM +0200, Thomas wrote:
But I have tried this, and it gives me the application which has only 1.8% of the memory. I need an overview of each process and what memory is actually used by it. If its a memory leak will the original process still own the memory ?
top and ps show how much memory is used by processes. If that doesn't account for all of the memory being used on the box, then it has to be the Linux kernel which has allocated this memory - you can check the "free" output for a brief summary of how much memory is used, and the output from "cat /proc/slabinfo" will give you a breakdown of the kernel memory allocations. (The "slabinfo" manpage has details about what these mean).
I have seen leaks in the kernel affect memory usage, so this is not as bizarre as it may seem. In fact, the "slab" column on the Hobbit demo site http://www.hswn.dk/hobbit/servers/servers.html was created to track one of these.
Regards, Henrik
A good operating system should attempt to use all available memory. Why have it when you don't use it? The way it uses it is to create a cache of things seen on disk. Next time you need the same data from disk an IO (a few milliseconds) is saved. Naturally it can throw this away in an instant if a more pressing need (like an application program) comes along. It makes sense to do repeat this process with all available memory.
While I can't directly speak for Linux, I have noticed that most other systems will slowly drift up to 80-90% of installed memory in use and just sit there (the little bit of free is essentially for emergency use).
That's not to say that you don't have a memory leak in the kernel that others have suggested, it just means that there is a perfectly normal reason for it that is also plausible. A far better measure of memory adequacy is in paging rates, but even that is suspect when normal IO is managed through the paging system with mmap most of the time these days.
-----Original Message----- From: Thomas [mailto:tlp-hobbit at holme-pedersen.dk] Sent: Wednesday, 23 May 2007 5:06 PM To: hobbit at hswn.dk Subject: [hobbit] OT: CentOS mem usage.
Hi all,
Totally off topic question but I guess here are at least 1 person with the right answer.
On my CentOS server I have 2 GB memory, however hobbit shows me that the
used memory is slowly being used and never freed. How can I determine which application has the mem leak ? Doing a lot of ps commands only produces a list of processes with less than 1% mem usage.
TIA
/Thomas
To unsubscribe from the hobbit list, send an e-mail to hobbit-unsubscribe at hswn.dk
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participants (5)
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Brian.Scott＠det.nsw.edu.au
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frederic.mangeant＠steria.com
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henrik＠hswn.dk
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lehnert＠adtech.de
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tlp-hobbit＠holme-pedersen.dk