Re: Inode cache uses a lot of memory

["Sebastian Kun" <seb@consensys.com>]

Reiserfs behaves a bit differently.  After running the same test:

inode_cache       1190503 1883987    512 269141 269141    1 :  124   62

The inode_cache uses around 1GB of memory.  This is a bit more than XFS,
which used only 750MB, but then XFS also has the xfs_inode cache, which uses
another 700MB.  Also, after doing a few gigs of I/O to another filesystem,
the memory was freed, and the inode cache shrunk to around 80MB:

inode_cache        27043 135821    512 19403 19403    1 :  124   62

XFS before:
xfs_ili           505795 505848    136 18066 18066    1 :  252  126
xfs_inode         1433589 1501336    468 187667 187667    1 :  124   62
inode_cache       1188597 1279404    512 182772 182772    1 :  124   62

XFS after:
xfs_ili           114037 476924    136 17033 17033    1 :  252  126
xfs_inode         269159 753952    468 94244 94244    1 :  124   62
inode_cache       239429 577038    512 82434 82434    1 :  124   62

I haven't tried it on ext2 or anything else.

Sebastian

----- Original Message -----
From: "Steve Lord" <lord@sgi.com>
To: "Sebastian Kun" <seb@consensys.com>
Cc: <linux-xfs@oss.sgi.com>
Sent: Monday, February 25, 2002 3:42 PM
Subject: Re: Inode cache uses a lot of memory

[...]

> Well, the xfs inode cache is pretty much controlled via the inode cache,
> which is only shrunk if you get into the cache pruning code if you run
> short of memory.
>
> I can easily prune out my inode cache without doing unmounts, but my
> memory size is a lot smaller than yours.
>
> I presume you do not see this issue with other filesystems?
>
> Steve
>
>
> --
>
> Steve Lord                                      voice: +1-651-683-3511
> Principal Engineer, Filesystem Software         email: lord@sgi.com