moosefs-users

[Moosefs-users] mfsmater memory!

[leon h. <cod...@gm...>]

hi` all

  I have two questions about memory of mfsmaster.
  1. When I increase the write data, read data from mfsmaster, mfsmaster
memory has always been 78m, why?

  top - 17:24:53 up 12 days, 23:57, 13 users,  load average: 5.97, 4.88,
2.63
Tasks:   1 total,   0 running,   1 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0%us,  0.3%sy,  0.0%ni,  0.0%id, 96.8%wa,  1.0%hi,  1.8%si,
 0.0%st
Mem:   1033400k total,  1025976k used,     7424k free,    55752k buffers
Swap:  2097144k total,   265344k used,  1831800k free,   444056k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND


27909 mfs        0 -19 93760  78m  656 S  0.0  7.8   0:00.05 mfsmaster

  2. When I delete data, mfsmaster memory will be decrease or unchanged?


thanks!

--leon hong

Re: [Moosefs-users] mfsmater memory!

[Anh K. H. <ky...@vi...>]

On Wed, 20 Oct 2010 17:27:06 +0800
leon hong <cod...@gm...> wrote:

>   I have two questions about memory of mfsmaster.
>   1. When I increase the write data, read data from mfsmaster,
> mfsmaster memory has always been 78m, why?
> 
>  [..]

>   2. When I delete data, mfsmaster memory will be decrease or
> unchanged?

The resource that mfsmaster consumes depends on the number of files on MFS system. If you delete some files, they are still in trash box. You can read more in FAQ section in http://moosefs.org/

Cheers,

-- 
Anh Ky Huynh

Re: [Moosefs-users] mfsmater memory!

[Laurent W. <lw...@hy...>]

On Wed, 20 Oct 2010 17:27:06 +0800
leon hong <cod...@gm...> wrote:

> hi` all
Hello Leon,
> 
>   I have two questions about memory of mfsmaster.
>   1. When I increase the write data, read data from mfsmaster, mfsmaster
> memory has always been 78m, why?
I'm unsure to understand your question, doesn't seem correct english to
me :) Will try to answer anyway.
metadata are cached in ram. So, mfsmaster memory consumption
varies with the number of files and directories, not on load.
> 
<snip>
> 
>   2. When I delete data, mfsmaster memory will be decrease or unchanged?
It will decrease. don't know though if it will once data are in the
trash or really deleted.
See http://www.moosefs.org/reference-guide.html#requirements for some
details.
HTH,
-- 
Laurent Wandrebeck
HYGEOS, Earth Observation Department / Observation de la Terre
Euratechnologies
165 Avenue de Bretagne
59000 Lille, France
tel: +33 3 20 08 24 98
http://www.hygeos.com
GPG fingerprint/Empreinte GPG: F5CA 37A4 6D03 A90C 7A1D  2A62 54E6 EF2C
D17C F64C

Re: [Moosefs-users] mfsmater memory!

[leon h. <cod...@gm...>]

hello, Laurent!
Thanks for your email.
I am sorry my English is not good.

In fact, I had a problem.
I know metadata are cached in ram.
metada is very big In my applications.metadata in ram is increasing, so I
want to delete some datas.
my question is: when I delete some datas in client, mfsmaster in ram will is
decrease or unchange?

2010/10/20 Laurent Wandrebeck <lw...@hy...>

> On Wed, 20 Oct 2010 17:27:06 +0800
> leon hong <cod...@gm...> wrote:
>
> > hi` all
> Hello Leon,
> >
> >   I have two questions about memory of mfsmaster.
> >   1. When I increase the write data, read data from mfsmaster, mfsmaster
> > memory has always been 78m, why?
> I'm unsure to understand your question, doesn't seem correct english to
> me :) Will try to answer anyway.
> metadata are cached in ram. So, mfsmaster memory consumption
> varies with the number of files and directories, not on load.
> >
> <snip>
> >
> >   2. When I delete data, mfsmaster memory will be decrease or unchanged?
> It will decrease. don't know though if it will once data are in the
> trash or really deleted.
> See http://www.moosefs.org/reference-guide.html#requirements for some
> details.
> HTH,
> --
> Laurent Wandrebeck
> HYGEOS, Earth Observation Department / Observation de la Terre
> Euratechnologies
> 165 Avenue de Bretagne
> 59000 Lille, France
> tel: +33 3 20 08 24 98
> http://www.hygeos.com
> GPG fingerprint/Empreinte GPG: F5CA 37A4 6D03 A90C 7A1D  2A62 54E6 EF2C
> D17C F64C
>