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Small changes in chapter 1

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niklas 2011-05-11 18:03:41 +02:00
parent 618243ff66
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@ -2456,8 +2456,8 @@ The need for fault tolerance in game servers is not as obvious as it may
be for other type of servers. be for other type of servers.
In general all servers strive to be fault tolerant as fault tolerance means In general all servers strive to be fault tolerant as fault tolerance means
more uptime and a safer system. more uptime and a safer system.
This applies to game servers as well, in brief good fault tolerance is This applies to game servers as well, briefly good fault tolerance is a
a way of satisfying customers. way of satisfying customers.
In general, game servers differ from many other fault tolerant systems In general, game servers differ from many other fault tolerant systems
in that high-availability is more important than the safety of the system. in that high-availability is more important than the safety of the system.
For example a simple calculation error will not be critical for a game For example a simple calculation error will not be critical for a game
@ -2492,17 +2492,7 @@ One important factor of any server is the availability.
\begin_layout Standard \begin_layout Standard
There are several good papers on how to migrate whole virtual machines among There are several good papers on how to migrate whole virtual machines among
nodes to replicate them nodes to replicate them but for the GGS a different approach has been chosen.
\begin_inset Note Note
status open
\begin_layout Plain Layout
Add more information about that
\end_layout
\end_inset
but for the GGS a different approach has been chosen.
Instead of just duplicating a virtual machine, the programming language Instead of just duplicating a virtual machine, the programming language
Erlang has been used which offers several features to increase the availability. Erlang has been used which offers several features to increase the availability.
Some of them are Some of them are
@ -3919,7 +3909,7 @@ key "armstrong2011"
. .
In Erlang, most things are processes. In Erlang, most things are processes.
The software running the Erlang code is known as the Erlang machine, or The software running the Erlang code is known as the Erlang machine, or
an Erlang node. a Erlang node.
Each Erlang node is capable of running several Each Erlang node is capable of running several
\emph on \emph on
threads threads
@ -7945,7 +7935,7 @@ Currently Mnesia is used for game data storage.
\begin_layout Standard \begin_layout Standard
The usage of Mnesia in the GGS is not the usage originally intended. The usage of Mnesia in the GGS is not the usage originally intended.
Originally a cache was to be placed before Mnesia. Originally a cache was to be placed before Mnesia.
The cache could be either Erlang Term Storage (ETS) or an Erlang process The cache could be either Erlang Term Storage (ETS) or a Erlang process
which keeps track of all database actions. which keeps track of all database actions.
The cache periodically flushes its contents to Mnesia, thereby reducing The cache periodically flushes its contents to Mnesia, thereby reducing
the Mnesia transactions overall. the Mnesia transactions overall.