[Tilesathome] Proposal: Keeping tileset as one file

[Jiri Klement]

So what do you think about the proposal now, when benchmarks shows
that keeping whole tilesets in one file is faster?

On 6/11/08, Jiri Klement <jiri.klement at gmail.com> wrote:
> Florian's benchmark already showed that reading from one big file is
>  faster than reading from lots of small files. My original idea was
>  keeping one z12 tileset in one file, not having one big file for many
>  tilesets as Florian tested, so I've made my own benchmark.
>
>  The benchmark can be downloaded here:
>  http://jttt.110mb.com/tahbench.jar
>
>  Tilesets have on average 500 files, one tileset is about 3.7MB.
>
>  Results for XFS filesystem:
>  Creating 1000 tilesets:
>  flat 147 s
>  dir about 2 hours
>
>  Reading 10000 random tiles
>  flat 151 s
>  dir 278 s
>
>  Reading more than one tile from tileset using flat tileset
>  1 tile - 151 s
>  4 tiles - 100 s
>  8 tiles - 81 s
>
>  Reiserfs
>  Creating 10000 tilesets
>  flat -  468 s
>  dir - 4464 s
>
>  Reading 100000 random tiles
>  flat - 1526 s
>  dir - 2604 s
>
>  Reading more than one tile from tileset using flat tileset (10000 tiles)
>  1 tile - 207 s
>  4 tiles - 143 s
>  8 tiles - 88 s
>
>  Notes:
>  XFS is not faster than reiserfs, I've just used smaller number of tilesets.
>  Disc cache was droped before each test using echo 3 > /proc/sys/vm/drop_caches
>  flat = one file per z12 tiles; dir = one file per tile
>  XFS and reiserfs were tested on different drives. XFS was tested on
>  laptop drive, reiserfs on old 20GB drive.
>  No caching is perfomed by application when reading more than one tile
>  from tileset.
>