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Loading A Realm In World Of Warcraft: Cataclysm

SSD Performance In Crysis 2, World Of Warcraft, And Civilization V
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Overall Statistics
World of Warcraft: Cataclysm: Realm Loading
Elapsed Time
00:18
Read Operations
5 727
Write Operations
124
Data Read
127.58 MB
Data Written
1.18 MB
Disk Busy Time
0.93 s
Average Data Rate
138.15 MB/


Blizzard purposely designed World of Warcraft to have a more modular file system. Updates from Blizzard are distributed as MPQ archives, which are decompressed and extracted to their proper locations. This works well because adding a few files can easily expand the WoW universe.

However, this translates into storing a lot of individual files of varying sizes, which makes for a random I/O workload involving mixed transfer sizes. That’s what we see here when we load to Crushblow.

Random performance on a hard drive is still terrible, which is why WoW gamers are going to experience a bigger speed-up loading a level than Crysis 2 players as they ditch their disks in favor of SSDs.

I/O Trends:

  • 88% of all operations occur at a queue depth of one
  • 62% of all operations are random


Seek DistanceSeek Distance

QDQD

Transfer SizeTransfer Size

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