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language in Load balancing

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Jeena Paradies 2011-05-12 20:39:36 +02:00
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@ -2617,8 +2617,8 @@ Each instance of the GGS contains several so called tables.
This is for example not a common occurrence in chess, where it would be This is for example not a common occurrence in chess, where it would be
represented as a player standing up from her current table and sitting represented as a player standing up from her current table and sitting
down at a new table, all within the same game session. down at a new table, all within the same game session.
Therefore, the main focus of the GGS is not to move players among tables, Therefore the main focus of the GGS is not to move players among tables,
but to keep a player in a table, and to start new tables instead. but to keep a player by one table, and to start new tables if needed instead.
When a server reaches a certain number of players the performance will When a server reaches a certain number of players the performance will
start to decrease, or worse, the server may even crash. start to decrease, or worse, the server may even crash.
To avoid this the GGS will start new tables on another server, using this To avoid this the GGS will start new tables on another server, using this
@ -2641,8 +2641,8 @@ reference "sec:Background"
there are two different types of scalability, structural scalability and there are two different types of scalability, structural scalability and
load scalability. load scalability.
To make the GGS scalable both types of scalability have to be considered. To make the GGS scalable both types of scalability have to be considered.
Structural scalability means in this case that it should be possible to Structural scalability means - in this case - that it should be possible
add more servers to an existing cluster of servers. to add more servers to an existing cluster of servers.
By adding more servers the limits of with how many users a system can be By adding more servers the limits of with how many users a system can be
burdened with is increased. burdened with is increased.
Load scalability, in contrast to structural scalability, is not about how Load scalability, in contrast to structural scalability, is not about how
@ -2661,7 +2661,7 @@ The need for load balancing varies among different kind of systems.
simple implementation of a load balancer, while in large systems it is simple implementation of a load balancer, while in large systems it is
useful to have extensive and well working load balancing implementations. useful to have extensive and well working load balancing implementations.
The need also depends on what kind of server structure the system is working The need also depends on what kind of server structure the system is working
on, a static structure where the number of servers is predefined or a dynamic on; a static structure where the number of servers is predefined or a dynamic
structure where this number varies. structure where this number varies.
\begin_inset ERT \begin_inset ERT
status open status open
@ -2702,8 +2702,8 @@ Fill up the capacity of one server completely, and then move over to the
\begin_layout Itemize \begin_layout Itemize
Evenly distribute all clients to all servers from the beginning. Evenly distribute all clients to all servers from the beginning.
When the load becomes too high on all of them a new problem arises: how When the load becomes too high on all of them a new problem arises: How
do we distribute load on these new servers? do we distribute the load on these new servers?
\end_layout \end_layout
\begin_layout Standard \begin_layout Standard
@ -2720,11 +2720,11 @@ Load balancing is a key component to achieve scalability in network systems.
\begin_layout Standard \begin_layout Standard
Load balancing can often be implemented using dedicated software, this means Load balancing can often be implemented using dedicated software, this means
that in many applications load balancing may not be implemented because that in many applications load balancing may not be implemented internally
there already exist functional or even better external solutions. because better external solutions exist already.
This depends on what specific needs the system has. This depends on what specific needs the system has.
A minor goal of this thesis is to analyze whether the GGS can use existing A minor goal of this thesis is to analyze whether the GGS can use existing
load balancing tools or if it is necessary how to implement load balancing load balancing tools or if it is necessary, how to implement load balancing
in the project. in the project.
\end_layout \end_layout
@ -3655,8 +3655,8 @@ The cost of swapping operating system processes becomes a problem when many
If the GGS system had been developed using regular operating system processes, If the GGS system had been developed using regular operating system processes,
it would have had to be designed in a way to minimize the number of processes. it would have had to be designed in a way to minimize the number of processes.
Using Erlang, which is capable of running very many processes, several Using Erlang, which is capable of running very many processes, several
times more than an operating system, the relation between the real times more than an operating system, the relation between the real world
world and the GGS (described in and the GGS (described in
\begin_inset CommandInset ref \begin_inset CommandInset ref
LatexCommand vref LatexCommand vref
reference "sec:Design-of-the" reference "sec:Design-of-the"