memory usage

memory usage

[Jiu Zheng]

I have some questions about memory usage:

If you type cat /proc/meminfo, you can see the following messages,

           total:          used:           free:         shared:
buffers:     cached:
Mem:  15015936 10260480   4755456  6352896  1523712  6025216
Swap: 98697216          4096 98693120
MemTotal:     14664 kB
MemFree:       4644 kB
MemShared:     6204 kB
Buffers:       1488 kB
Cached:        5884 kB
SwapTotal:    96384 kB
SwapFree:     96380 kB

Can anybody explain what EXACTLY are shared, buffers, and cached?
One can also get memory usage information of all processes by typing "ps
aux".
Are the numbers (in "RSS" collomn?) having any relationship with those
in /proc/meminfo ?

Thanks,

Jiu


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memory usage

[gis88530]

Hello,

I can use "ps" to see memory usage of daemons and user programs.
I can't find any memory information of kernel with "top" and "ps".

Do you know how to take memory usage information of kernel ?
Thanks for your help.


Cheers,
Tom

Re: memory usage

[Andi Kleen]

On Wed, Apr 11, 2001 at 01:42:55AM +0800, gis88530 wrote:
> Hello,
> 
> I can use "ps" to see memory usage of daemons and user programs.
> I can't find any memory information of kernel with "top" and "ps".
> 
> Do you know how to take memory usage information of kernel ?

Try cat /proc/slabinfo


-Andi

Re: memory usage

[gis88530]

Thanks.
cat /proc/slabinfo look like as follows.
Each row have three columns.
Could you tell me what do they mean in second and third column?
kmem_cache        29     42
pio_request            0      0

My second question is:
We can find memory usage of daemon(apache) by ps or top.
e.g. apache use 5400k physical memory 

Does the memory usage of /proc/slabinfo include some of 
5400k ? I guess 5400k can separate into two part
(kernel space part and user space part). 

Is any thing wrong? Thanks
Cheers,
Tom

Re: memory usage

[Marcin Kowalski]

> I can use "ps" to see memory usage of daemons and user programs.
> I can't find any memory information of kernel with "top" and "ps".

> Do you know how to take memory usage information of kernel ?
> Thanks for your help.


Regarding this issue, I have a similar problem if I do a free on my system I 
get :
---   total       used       free     shared    buffers     cached
Mem:       1157444    1148120       9324          0      22080     459504
-/+ buffers/cache:     666536     490908
Swap:       641016      19072     621944
---
Now what I do a ps there seems no way to accound for the 500mb + of memory 
used. No single or group of processes uses that amount of memory. THis is 
very disconcerting, coupled with extremely high loads when cache is dumped to 
disk locking up the machine makes me want to move back to 2.2.19 from 2.4.3.

I would also be curious to see how the kernel is using memory...

TIA
MARCin


-- 
-----------------------------
     Marcin Kowalski
     Linux/Perl Developer
     Datrix Solutions
     Cel. 082-400-7603
      ***Open Source Kicks Ass***
-----------------------------

Memory Usage

[Srikanta R]

Hi all,

Which variable in /proc/meminfo (using 2.4.8 kernel)gives me the
correct memory usage at any point of time.
The problem is when I run my application, the "MemFree:" variable under
/proc/meminfo drops from around 25MB to 16MB. I kill the application
and "MemFree:" shows 17MB. How do I get the actual Memory being used ? ie
after I kill the application I should get "MemFree: = 25MB".

If I do the calculation which is being done in procedure -
nr_free_buffer_pages() (linux/mm/page_alloc.c) i.e adding the
zone->free_pages ,zone->inactive_clean_pages,
zone->inactive_dirty_pages, for all the zones, do I get the exact free RAM
available at any point of time(taking into consideration caching and all)
?

Thanks for any help or pointers.

Rgds,
Srikanta.

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Re: Unrecognized opcode: `mtdcr'

[Matt Porter]

On Wed, May 29, 2002 at 01:43:50PM -0700, Matt Porter wrote:
> There is _a_ 440-specific opcode, dlbmnz.  It's not yet supported by
> gas (and ideally glibc).  For now, a 405 enabled toolchain is
> sufficient.

Heh, can't type...the opcode is dlmzb.

-Matt

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Memory usage

[Owen Green]

Hi all,

I`m currently developing applications for a linuxppc
embedded system (mpc8xx) with linux-2.4.4 from denx
and I realised that even with a tiny application I
spent something like 140k on my RAM area, where at
least 100k of that is for ld-2.2.3.so, I guess.
The question is, am I right? Is there a way to share
the code section of ld-2.2.3.so along applications? Is
there a way to get this memory size down?

Thanks in advance,

Owen.


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Memory usage

[Adam Luchjenbroers]

OS: Linux Mandrake 9.0
Kernel: 2.4.20
Soltek SL-75DRV5
512MB DDR
Althon XP2100+

I'm noticing memory usage that I cannot trace back to a process - alot of it 
too. I use top and the "M" command to list programs by memory usage - but 
what I see with it (or using other system monitoring tools) are only a few 
processes and none that can explain the memory usage.

Even dropping down to runlevel 1 still displays RAM usage in excess of 300MB. 
Maybe I've still got alot to spare but I still want to fix this problem - 
currently running BlackBox under X (I use some KDE apps, but even after 
killing off all kdeinit processes the memory usage stays high).

So, what would be the cause of this mysterious memory usage?

-- 
"taking advice on what the GPL means from Microsoft is like taking Stalin's 
word on the meaning of the US Constitution." - Eben Moglen

Please avoid sending me Word or PowerPoint attachments.
See http://www.fsf.org/philosophy/no-word-attachments.html


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Re: Memory usage

[Ray Olszewski]

Where are you "noticing" this memory usage? If it is in the "Mem:" line in 
top, probably all you are seeing is the kernel's use of RAM as cache and 
buffer. In slightly simplified form, when a process finishes running, or a 
file closes, the kernel leaves it in memory **if** it does not need that 
memorr for something else. (This way, it can run or open faster if called 
again.)

As a result, *any* Linux system will over time approach 100% memory usage 
as reported by this measure. If you want to check use of RAM by active 
processes, run "free" and look at the second line of its report.

If you are "noticing" this problem somewhere else, please post a followup 
that describes what you are seeing a bit more exactly.

At 01:17 AM 4/15/2003 +0930, Adam Luchjenbroers wrote:
>OS: Linux Mandrake 9.0
>Kernel: 2.4.20
>Soltek SL-75DRV5
>512MB DDR
>Althon XP2100+
>
>I'm noticing memory usage that I cannot trace back to a process - alot of it
>too. I use top and the "M" command to list programs by memory usage - but
>what I see with it (or using other system monitoring tools) are only a few
>processes and none that can explain the memory usage.
>
>Even dropping down to runlevel 1 still displays RAM usage in excess of 300MB.
>Maybe I've still got alot to spare but I still want to fix this problem -
>currently running BlackBox under X (I use some KDE apps, but even after
>killing off all kdeinit processes the memory usage stays high).
>
>So, what would be the cause of this mysterious memory usage?



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Re: Memory usage

[Peter]

Want to free memory do:

locate /usr/bin/x*

 free
             total       used       free 
Mem:        223240     145572      77668

locate /usr/bin/x*

free
             total       used       free 
Mem:        223240      92752     130488

Regards
-- 
Peter

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how to test rpc_pipefs

[Christoph Hellwig]

I have some simple changes to make rpc_pipefs use less obscure VFS
APIs and I'd like to test it before submitting, any idea how to give
rpc_pipefs some coverage without settign up a full-blown NFSv4 env?


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Re: how to test rpc_pipefs

[Trond Myklebust]

fr den 06.05.2005 Klokka 17:10 (+0100) skreiv Christoph Hellwig:
> I have some simple changes to make rpc_pipefs use less obscure VFS
> APIs and I'd like to test it before submitting, any idea how to give
> rpc_pipefs some coverage without settign up a full-blown NFSv4 env?

Hi Christoph,

Well, all NFS environments (including v2 and v3) automatically create a
basic set of files in the nfs/clnt* subdirectory, but beware of
generalising that file behaviour since the open(), read(), write() and
close() are directly hooked by the objects you are exporting (krb5, and
idmap).

Could you be a bit more specific about what kind of API changes you are
proposing?

Cheers,
  Trond



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Re: how to test rpc_pipefs

[Christoph Hellwig]

On Fri, May 06, 2005 at 04:09:31PM -0400, Trond Myklebust wrote:
> fr den 06.05.2005 Klokka 17:10 (+0100) skreiv Christoph Hellwig:
> > I have some simple changes to make rpc_pipefs use less obscure VFS
> > APIs and I'd like to test it before submitting, any idea how to give
> > rpc_pipefs some coverage without settign up a full-blown NFSv4 env?
> 
> Hi Christoph,
> 
> Well, all NFS environments (including v2 and v3) automatically create a
> basic set of files in the nfs/clnt* subdirectory, but beware of
> generalising that file behaviour since the open(), read(), write() and
> close() are directly hooked by the objects you are exporting (krb5, and
> idmap).

Right - it's the non-default ones this patch is all about.  Sorry for beeing
unclear.

> 
> Could you be a bit more specific about what kind of API changes you are
> proposing?

Sure.  Currently rpc_mkdir/rpc_rmdir and rpc_mkpipe/mk_unlink have an API
that's a little unfortunate.  They take an path relative to the rpc_pipefs
root and thus need to perform a full lookup.  If you look at debugfs or
usbfs they always store the dentry for directories they created and thus
can pass in a dentry + single pathname component pair into their equivalents
of the above functions.

And in fact rpc_pipefs actually stores a dentry for all but one component so
this change not only simplifies the core rpc_pipe code but also the callers.

Untested patch is below:

Index: linux-2.6/net/sunrpc/rpc_pipe.c
===================================================================
--- linux-2.6.orig/net/sunrpc/rpc_pipe.c	2005-05-09 13:50:05.000000000 +0200
+++ linux-2.6/net/sunrpc/rpc_pipe.c	2005-05-09 15:02:34.000000000 +0200
@@ -414,38 +414,6 @@
 	simple_release_fs(&rpc_mount, &rpc_mount_count);
 }
 
-static int
-rpc_lookup_parent(char *path, struct nameidata *nd)
-{
-	if (path[0] == '\0')
-		return -ENOENT;
-	if (rpc_get_mount()) {
-		printk(KERN_WARNING "%s: %s failed to mount "
-			       "pseudofilesystem \n", __FILE__, __FUNCTION__);
-		return -ENODEV;
-	}
-	nd->mnt = mntget(rpc_mount);
-	nd->dentry = dget(rpc_mount->mnt_root);
-	nd->last_type = LAST_ROOT;
-	nd->flags = LOOKUP_PARENT;
-	nd->depth = 0;
-
-	if (path_walk(path, nd)) {
-		printk(KERN_WARNING "%s: %s failed to find path %s\n",
-				__FILE__, __FUNCTION__, path);
-		rpc_put_mount();
-		return -ENOENT;
-	}
-	return 0;
-}
-
-static void
-rpc_release_path(struct nameidata *nd)
-{
-	path_release(nd);
-	rpc_put_mount();
-}
-
 static struct inode *
 rpc_get_inode(struct super_block *sb, int mode)
 {
@@ -550,197 +518,144 @@
 	return -ENOMEM;
 }
 
-static int
-__rpc_mkdir(struct inode *dir, struct dentry *dentry)
-{
-	struct inode *inode;
-
-	inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR);
-	if (!inode)
-		goto out_err;
-	inode->i_ino = iunique(dir->i_sb, 100);
-	d_instantiate(dentry, inode);
-	dir->i_nlink++;
-	inode_dir_notify(dir, DN_CREATE);
-	rpc_get_mount();
-	return 0;
-out_err:
-	printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
-			__FILE__, __FUNCTION__, dentry->d_name.name);
-	return -ENOMEM;
-}
-
-static int
-__rpc_rmdir(struct inode *dir, struct dentry *dentry)
-{
-	int error;
-
-	shrink_dcache_parent(dentry);
-	if (dentry->d_inode) {
-		rpc_close_pipes(dentry->d_inode);
-		rpc_inode_setowner(dentry->d_inode, NULL);
-	}
-	if ((error = simple_rmdir(dir, dentry)) != 0)
-		return error;
-	if (!error) {
-		inode_dir_notify(dir, DN_DELETE);
-		d_drop(dentry);
-		rpc_put_mount();
-	}
-	return 0;
-}
-
-static struct dentry *
-rpc_lookup_negative(char *path, struct nameidata *nd)
+struct dentry *
+rpc_mkdir(struct dentry *parent, char *name, struct rpc_clnt *rpc_client)
 {
+	struct inode *dir = parent->d_inode;
 	struct dentry *dentry;
-	struct inode *dir;
+	struct inode *inode;
 	int error;
-
-	if ((error = rpc_lookup_parent(path, nd)) != 0)
+	
+	error = rpc_get_mount();
+	if (error)
 		return ERR_PTR(error);
-	dir = nd->dentry->d_inode;
+
 	down(&dir->i_sem);
-	dentry = lookup_hash(&nd->last, nd->dentry);
+	dentry = lookup_one_len(name, parent, strlen(name));
 	if (IS_ERR(dentry))
-		goto out_err;
+		goto out_unlock;
 	if (dentry->d_inode) {
-		dput(dentry);
 		dentry = ERR_PTR(-EEXIST);
-		goto out_err;
+		goto out_dput;
 	}
-	return dentry;
-out_err:
-	up(&dir->i_sem);
-	rpc_release_path(nd);
-	return dentry;
-}
 
+	inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR);
+	if (!inode)
+		goto out_dput;
+	inode->i_ino = iunique(dir->i_sb, 100);
+	dir->i_nlink++;
+	RPC_I(dentry->d_inode)->private = rpc_client;
 
-struct dentry *
-rpc_mkdir(char *path, struct rpc_clnt *rpc_client)
-{
-	struct nameidata nd;
-	struct dentry *dentry;
-	struct inode *dir;
-	int error;
+	d_instantiate(dentry, inode);
+	dget(dentry);
+	up(&dir->i_sem);
+
+	inode_dir_notify(dir, DN_CREATE);
 
-	dentry = rpc_lookup_negative(path, &nd);
-	if (IS_ERR(dentry))
-		return dentry;
-	dir = nd.dentry->d_inode;
-	if ((error = __rpc_mkdir(dir, dentry)) != 0)
-		goto err_dput;
-	RPC_I(dentry->d_inode)->private = rpc_client;
 	error = rpc_populate(dentry, authfiles,
 			RPCAUTH_info, RPCAUTH_EOF);
 	if (error)
-		goto err_depopulate;
-out:
-	up(&dir->i_sem);
-	rpc_release_path(&nd);
+		goto out_depopulate;
+
 	return dentry;
-err_depopulate:
-	rpc_depopulate(dentry);
-	__rpc_rmdir(dir, dentry);
-err_dput:
+
+ out_depopulate:
+	rpc_rmdir(dentry);
+ out_dput:
 	dput(dentry);
-	printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n",
-			__FILE__, __FUNCTION__, path, error);
-	dentry = ERR_PTR(error);
-	goto out;
+ out_unlock:
+	up(&dir->i_sem);
+	rpc_put_mount();
+	return dentry;
 }
 
-int
-rpc_rmdir(char *path)
+void
+rpc_rmdir(struct dentry *dentry)
 {
-	struct nameidata nd;
-	struct dentry *dentry;
-	struct inode *dir;
-	int error;
+	struct dentry *parent = dentry->d_parent;
 
-	if ((error = rpc_lookup_parent(path, &nd)) != 0)
-		return error;
-	dir = nd.dentry->d_inode;
-	down(&dir->i_sem);
-	dentry = lookup_hash(&nd.last, nd.dentry);
-	if (IS_ERR(dentry)) {
-		error = PTR_ERR(dentry);
-		goto out_release;
-	}
 	rpc_depopulate(dentry);
-	error = __rpc_rmdir(dir, dentry);
-	dput(dentry);
-out_release:
-	up(&dir->i_sem);
-	rpc_release_path(&nd);
-	return error;
+
+	down(&parent->d_inode->i_sem);
+	if (dentry->d_inode) {
+		rpc_close_pipes(dentry->d_inode);
+		rpc_inode_setowner(dentry->d_inode, NULL);
+		simple_rmdir(parent->d_inode, dentry);
+	}
+	up(&parent->d_inode->i_sem);
+
+	inode_dir_notify(parent->d_inode, DN_DELETE);
+	rpc_put_mount();
 }
 
 struct dentry *
-rpc_mkpipe(char *path, void *private, struct rpc_pipe_ops *ops, int flags)
+rpc_mkpipe(struct dentry *parent, char *name, void *private,
+	   struct rpc_pipe_ops *ops, int flags)
 {
-	struct nameidata nd;
+	struct inode *dir = parent->d_inode;
 	struct dentry *dentry;
-	struct inode *dir, *inode;
+	struct inode *inode;
 	struct rpc_inode *rpci;
+	int error;
 
-	dentry = rpc_lookup_negative(path, &nd);
+	error = rpc_get_mount();
+	if (error)
+		return ERR_PTR(error);
+
+	down(&parent->d_inode->i_sem);
+	dentry = lookup_one_len(name, parent, strlen(name));
 	if (IS_ERR(dentry))
-		return dentry;
-	dir = nd.dentry->d_inode;
-	inode = rpc_get_inode(dir->i_sb, S_IFSOCK | S_IRUSR | S_IWUSR);
-	if (!inode)
-		goto err_dput;
+		goto out_unlock;
+	if (dentry->d_inode) {
+		dentry = ERR_PTR(-EEXIST);
+		goto out_dput;
+	}
+
+	inode = rpc_get_inode(parent->d_inode->i_sb,
+			S_IFSOCK | S_IRUSR | S_IWUSR);
+	if (!inode) {
+		dentry = ERR_PTR(-ENOMEM);
+		goto out_dput;
+	}
+
 	inode->i_ino = iunique(dir->i_sb, 100);
 	inode->i_fop = &rpc_pipe_fops;
-	d_instantiate(dentry, inode);
+
 	rpci = RPC_I(inode);
 	rpci->private = private;
 	rpci->flags = flags;
 	rpci->ops = ops;
+
+	d_instantiate(dentry, inode);
+	dget(dentry);
+	up(&parent->d_inode->i_sem);
+
 	inode_dir_notify(dir, DN_CREATE);
-out:
-	up(&dir->i_sem);
-	rpc_release_path(&nd);
 	return dentry;
-err_dput:
+
+ out_dput:
 	dput(dentry);
-	dentry = ERR_PTR(-ENOMEM);
-	printk(KERN_WARNING "%s: %s() failed to create pipe %s (errno = %d)\n",
-			__FILE__, __FUNCTION__, path, -ENOMEM);
-	goto out;
+ out_unlock:
+	up(&parent->d_inode->i_sem);
+	rpc_put_mount();
+	return dentry;
 }
 
-int
-rpc_unlink(char *path)
+void
+rpc_unlink(struct dentry *dentry)
 {
-	struct nameidata nd;
-	struct dentry *dentry;
-	struct inode *dir;
-	int error;
+	struct dentry *parent = dentry->d_parent;
 
-	if ((error = rpc_lookup_parent(path, &nd)) != 0)
-		return error;
-	dir = nd.dentry->d_inode;
-	down(&dir->i_sem);
-	dentry = lookup_hash(&nd.last, nd.dentry);
-	if (IS_ERR(dentry)) {
-		error = PTR_ERR(dentry);
-		goto out_release;
-	}
-	d_drop(dentry);
+	down(&parent->d_inode->i_sem);
 	if (dentry->d_inode) {
 		rpc_close_pipes(dentry->d_inode);
 		rpc_inode_setowner(dentry->d_inode, NULL);
-		error = simple_unlink(dir, dentry);
+		simple_unlink(parent->d_inode, dentry);
 	}
-	dput(dentry);
-	inode_dir_notify(dir, DN_DELETE);
-out_release:
-	up(&dir->i_sem);
-	rpc_release_path(&nd);
-	return error;
+	up(&parent->d_inode->i_sem);
+
+	inode_dir_notify(parent->d_inode, DN_DELETE);
+	rpc_put_mount();
 }
 
 /*


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Memory usage

[liz]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Greetings,

How does NFS handle caching? more particularly is there a way to limit
the memory usage for caching?


Does it show up as kernel cache or is it displayed in the process list?

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Version: GnuPG v1.4.0 (GNU/Linux)

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o3aqWUymcZ40hJVTH03CWKc=
=yr4r
-----END PGP SIGNATURE-----



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Re: Memory usage

[liz]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

NFS server.

We have a box running as a NFS server and a mysql server. What were
running into is that we have a large amount of memory being sucked up
by cache and the box is swapping like crazy. It doesnt seem to be
release the cache back so im stumped. The only thing using memory is
mysql.

All we can think of is the NFS server is using kernel cache for
caching (a reach i know)


|~        total:    used:    free:  shared: buffers:  cached:
|Mem:  4224462848 4206002176 18460672        0 41304064 2938032128
|Swap: 2146754560 1073373184 1073381376
|MemTotal:      4125452 kB
|MemFree:         18028 kB
|MemShared:           0 kB
|Buffers:         40336 kB
|Cached:        2095616 kB                        <---- 2G disk cache
|SwapCached:     773556 kB
|Active:        3186300 kB
|ActiveAnon:    1707252 kB
|ActiveCache:   1479048 kB
|Inact_dirty:    607944 kB
|Inact_laundry:  117300 kB
|Inact_clean:     65180 kB
|Inact_target:   795344 kB
|HighTotal:     3276224 kB
|HighFree:         1200 kB
|LowTotal:       849228 kB
|LowFree:         16828 kB
|SwapTotal:     2096440 kB                      <-- 1G swap usage
|SwapFree:      1048224 kB
|HugePages_Total:     0
|HugePages_Free:      0
|Hugepagesize:     2048 kB



If it is indeed NFS is there a way to make it not do that :P I looked
in my o'reilly book, googled and posted to kernel dev (WIth my
asbestos jacket on and zipped up ;)

The machine is running 2.4.21 EL-SMP

Im completely stumped...

Thanks for looking at it :)

Liz

|> How does NFS handle caching? more particularly is there a way to limit
|> the memory usage for caching?
|>
|>
|> Does it show up as kernel cache or is it displayed in the process
|> list?
|>
| Liz,
|
| Are you referring to a nfs server or client?
|
| -Sean
|

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Re: Memory usage

[seth vidal]

> If it is indeed NFS is there a way to make it not do that :P I looked
> in my o'reilly book, googled and posted to kernel dev (WIth my
> asbestos jacket on and zipped up ;)
> 
> The machine is running 2.4.21 EL-SMP

Go to red hat's bugzilla. Read up on slab values and how to adjust your
caching. This is what's going on.
Also:
http://people.redhat.com/nhorman/papers/papers.html
read the top paper. i think it will help your problem some.

-sv




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Re: Memory usage

[Neil Horman]

On Tue, May 10, 2005 at 08:07:52PM -0700, liz wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> NFS server.
> 
> We have a box running as a NFS server and a mysql server. What were
> running into is that we have a large amount of memory being sucked up
> by cache and the box is swapping like crazy. It doesnt seem to be
> release the cache back so im stumped. The only thing using memory is
> mysql.
> 
> All we can think of is the NFS server is using kernel cache for
> caching (a reach i know)
> 
> 
Depending on how frequently your NFS client accesses its file data in cache,
swapping process pages may be the logical thing to do.  But if not, you can, in
the 2.4.21 RHEL kernels use the pagecache sysctl to help reduce pagecache usage more
quickly when under VM pressure.  Note that in 2.4.21, setting pagecache.max does
not place a cieling on how much memory is used for pagecache, it just sets
policy for where memory should be reclaimed from first when needed. Its all in
the paper that Seth Referenced.

Hope that helps
Neil

> |~        total:    used:    free:  shared: buffers:  cached:
> |Mem:  4224462848 4206002176 18460672        0 41304064 2938032128
> |Swap: 2146754560 1073373184 1073381376
> |MemTotal:      4125452 kB
> |MemFree:         18028 kB
> |MemShared:           0 kB
> |Buffers:         40336 kB
> |Cached:        2095616 kB                        <---- 2G disk cache
> |SwapCached:     773556 kB
> |Active:        3186300 kB
> |ActiveAnon:    1707252 kB
> |ActiveCache:   1479048 kB
> |Inact_dirty:    607944 kB
> |Inact_laundry:  117300 kB
> |Inact_clean:     65180 kB
> |Inact_target:   795344 kB
> |HighTotal:     3276224 kB
> |HighFree:         1200 kB
> |LowTotal:       849228 kB
> |LowFree:         16828 kB
> |SwapTotal:     2096440 kB                      <-- 1G swap usage
> |SwapFree:      1048224 kB
> |HugePages_Total:     0
> |HugePages_Free:      0
> |Hugepagesize:     2048 kB
> 
> 
> 
> If it is indeed NFS is there a way to make it not do that :P I looked
> in my o'reilly book, googled and posted to kernel dev (WIth my
> asbestos jacket on and zipped up ;)
> 
> The machine is running 2.4.21 EL-SMP
> 
> Im completely stumped...
> 
> Thanks for looking at it :)
> 
> Liz
> 
> |> How does NFS handle caching? more particularly is there a way to limit
> |> the memory usage for caching?
> |>
> |>
> |> Does it show up as kernel cache or is it displayed in the process
> |> list?
> |>
> | Liz,
> |
> | Are you referring to a nfs server or client?
> |
> | -Sean
> |
> 
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.0 (GNU/Linux)
> 
> iD8DBQFCgXcIlt/irWun80cRAqtaAJ9LaRgz6LN44xh9d0bbvpLizWW2egCePjTD
> QWAHmxtHMeyCOKqw3JcPVwg=
> =wkVW
> -----END PGP SIGNATURE-----
> 
> 
> 
> -------------------------------------------------------
> This SF.Net email is sponsored by Oracle Space Sweepstakes
> Want to be the first software developer in space?
> Enter now for the Oracle Space Sweepstakes!
> http://ads.osdn.com/?ad_id=7393&alloc_id=16281&op=click
> _______________________________________________
> NFS maillist  -  NFS@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nfs

-- 
/***************************************************
 *Neil Horman
 *Software Engineer
 *Red Hat, Inc.
 *nhorman@redhat.com
 *gpg keyid: 1024D / 0x92A74FA1
 *http://pgp.mit.edu
 ***************************************************/


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RE: Memory usage

[Edward Hibbert]

We've seen similar problems with 2.4 kernels, where the cache grows and =
starts swapping processes out causing atrocious performance. =20

We didn't find any solution on a 2.4 kernel (I'm not saying there isn't =
one - just that the various tuning parameters we tried didn't do it for =
us) and after considerable effort gave up and switched to a 2.6 kernel.  =


Regards,

Edward.

-----Original Message-----
From: nfs-admin@lists.sourceforge.net
[mailto:nfs-admin@lists.sourceforge.net]On Behalf Of Neil Horman
Sent: 11 May 2005 14:42
To: liz
Cc: Sean Dogar; nfs@lists.sourceforge.net
Subject: Re: [NFS] Memory usage


On Tue, May 10, 2005 at 08:07:52PM -0700, liz wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>=20
> NFS server.
>=20
> We have a box running as a NFS server and a mysql server. What were
> running into is that we have a large amount of memory being sucked up
> by cache and the box is swapping like crazy. It doesnt seem to be
> release the cache back so im stumped. The only thing using memory is
> mysql.
>=20
> All we can think of is the NFS server is using kernel cache for
> caching (a reach i know)
>=20
>=20
Depending on how frequently your NFS client accesses its file data in =
cache,
swapping process pages may be the logical thing to do.  But if not, you =
can, in
the 2.4.21 RHEL kernels use the pagecache sysctl to help reduce =
pagecache usage more
quickly when under VM pressure.  Note that in 2.4.21, setting =
pagecache.max does
not place a cieling on how much memory is used for pagecache, it just =
sets
policy for where memory should be reclaimed from first when needed. Its =
all in
the paper that Seth Referenced.

Hope that helps
Neil

> |~        total:    used:    free:  shared: buffers:  cached:
> |Mem:  4224462848 4206002176 18460672        0 41304064 2938032128
> |Swap: 2146754560 1073373184 1073381376
> |MemTotal:      4125452 kB
> |MemFree:         18028 kB
> |MemShared:           0 kB
> |Buffers:         40336 kB
> |Cached:        2095616 kB                        <---- 2G disk cache
> |SwapCached:     773556 kB
> |Active:        3186300 kB
> |ActiveAnon:    1707252 kB
> |ActiveCache:   1479048 kB
> |Inact_dirty:    607944 kB
> |Inact_laundry:  117300 kB
> |Inact_clean:     65180 kB
> |Inact_target:   795344 kB
> |HighTotal:     3276224 kB
> |HighFree:         1200 kB
> |LowTotal:       849228 kB
> |LowFree:         16828 kB
> |SwapTotal:     2096440 kB                      <-- 1G swap usage
> |SwapFree:      1048224 kB
> |HugePages_Total:     0
> |HugePages_Free:      0
> |Hugepagesize:     2048 kB
>=20
>=20
>=20
> If it is indeed NFS is there a way to make it not do that :P I looked
> in my o'reilly book, googled and posted to kernel dev (WIth my
> asbestos jacket on and zipped up ;)
>=20
> The machine is running 2.4.21 EL-SMP
>=20
> Im completely stumped...
>=20
> Thanks for looking at it :)
>=20
> Liz
>=20
> |> How does NFS handle caching? more particularly is there a way to =
limit
> |> the memory usage for caching?
> |>
> |>
> |> Does it show up as kernel cache or is it displayed in the process
> |> list?
> |>
> | Liz,
> |
> | Are you referring to a nfs server or client?
> |
> | -Sean
> |
>=20
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.0 (GNU/Linux)
>=20
> iD8DBQFCgXcIlt/irWun80cRAqtaAJ9LaRgz6LN44xh9d0bbvpLizWW2egCePjTD
> QWAHmxtHMeyCOKqw3JcPVwg=3D
> =3DwkVW
> -----END PGP SIGNATURE-----
>=20
>=20
>=20
> -------------------------------------------------------
> This SF.Net email is sponsored by Oracle Space Sweepstakes
> Want to be the first software developer in space?
> Enter now for the Oracle Space Sweepstakes!
> http://ads.osdn.com/?ad_id=3D7393&alloc_id=3D16281&op=3Dclick
> _______________________________________________
> NFS maillist  -  NFS@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nfs

--=20
/***************************************************
 *Neil Horman
 *Software Engineer
 *Red Hat, Inc.
 *nhorman@redhat.com
 *gpg keyid: 1024D / 0x92A74FA1
 *http://pgp.mit.edu
 ***************************************************/


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