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Jeena Paradies 2011-05-11 14:59:16 +02:00
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@ -678,7 +678,7 @@ key "news/cnet/com/WoWProblems"
. .
\begin_inset Note Note \begin_inset Note Note
status open status collapsed
\begin_layout Plain Layout \begin_layout Plain Layout
Citation needed Citation needed
@ -689,7 +689,7 @@ Citation needed
The existing game servers are functional but they lack good fault tolerance The existing game servers are functional but they lack good fault tolerance
and the ability to scale well and the ability to scale well
\begin_inset Note Note \begin_inset Note Note
status open status collapsed
\begin_layout Plain Layout \begin_layout Plain Layout
Citation needed Citation needed
@ -765,8 +765,8 @@ key "Armstrong03"
either. either.
An unavailable phone system could potentially have life threatening consequence An unavailable phone system could potentially have life threatening consequence
s, leaving the public unable to contact emergency services. s, leaving the public unable to contact emergency services.
The same can not be said about an unavailable game server. The same cannot be said about an unavailable game server.
The statement that game servers are less important than phone systems is The statement that game servers are less important than phone systems are
not a reason not to draw wisdom from what the telecoms have already learned. not a reason not to draw wisdom from what the telecoms have already learned.
\end_layout \end_layout
@ -1066,7 +1066,7 @@ reference "cha:Implementation-of-a"
provides a description of the prototype developed for this thesis. provides a description of the prototype developed for this thesis.
\begin_inset Note Note \begin_inset Note Note
status open status collapsed
\begin_layout Plain Layout \begin_layout Plain Layout
We could go on and on about erlang.. We could go on and on about erlang..
@ -1127,7 +1127,7 @@ Returning to the game industry, emergency services will not be contacted
Consider an online casino company. Consider an online casino company.
The online casino company's servers must be available at all times to allow The online casino company's servers must be available at all times to allow
customers to play. customers to play.
If the servers are unavailable, customers can not play, and the company If the servers are unavailable, customers cannot play, and the company
loses money. loses money.
In this scenario, an unavailable server can be compared to a closed real-world In this scenario, an unavailable server can be compared to a closed real-world
casino. casino.
@ -1651,8 +1651,7 @@ Moves by players are made using the tables present in the chess club.
This isolation of the games play an important part in many properties of This isolation of the games play an important part in many properties of
the GGS, the isolation means that games can for example be transferred the GGS, the isolation means that games can for example be transferred
among different chess clubs, furthermore, if cheating takes place, corruption among different chess clubs, furthermore, if cheating takes place, corruption
can only occur in the particular table where it was found, and can not can only occur in the particular table where it was found, and cannot spread.
spread.
\end_layout \end_layout
\begin_layout Standard \begin_layout Standard
@ -2273,8 +2272,8 @@ There are two main ways in which computer communication over the Internet
is the most prominent application layer protocol. is the most prominent application layer protocol.
The transport layer protocols, are commonly used to transport application The transport layer protocols, are commonly used to transport application
layer protocols, such as HTTP. layer protocols, such as HTTP.
TCP and UDP can not be used on their own, without an application layer TCP and UDP cannot be used on their own, without an application layer protocol
protocol on top. on top.
Application layer protocols such as HTTP on the other hand needs a transport Application layer protocols such as HTTP on the other hand needs a transport
layer protocol in order to work. layer protocol in order to work.
@ -3074,7 +3073,7 @@ status open
nomenclature{ nomenclature{
\backslash \backslash
textbf{Network split}}{Separation of two networks, occurs when two networks textbf{Network split}}{Separation of two networks, occurs when two networks
can not communicate, commonly because of a hardware or software failiure} cannot communicate, commonly because of a hardware or software failiure}
\end_layout \end_layout
\end_inset \end_inset
@ -3174,7 +3173,7 @@ Security
\begin_layout Standard \begin_layout Standard
We only support languages running in a sandboxed environment. We only support languages running in a sandboxed environment.
Each game session is started in its own sandbox. Each game session is started in its own sandbox.
The sandboxing isolates the games in such a way that they can not interfere The sandboxing isolates the games in such a way that they cannot interfere
with each other. with each other.
If sandboxing was not in place, one game could potentially modify the contents If sandboxing was not in place, one game could potentially modify the contents
of a different game. of a different game.
@ -4214,7 +4213,7 @@ In using message passing in favor of the methods commonly used at the time,
the issues commonly associated with shared memory and locking were avoided. the issues commonly associated with shared memory and locking were avoided.
In Erlang, everything is a process, and everything operates in its own In Erlang, everything is a process, and everything operates in its own
memory space. memory space.
Memory can not be shared among processes, which prohibits a process from Memory cannot be shared among processes, which prohibits a process from
corrupting the memory of a different process. corrupting the memory of a different process.
\end_layout \end_layout
@ -5281,8 +5280,8 @@ Upon a crash, the coordinator process recovers the prior good state from
A supervisor process monitors the coordinator process and restarts the A supervisor process monitors the coordinator process and restarts the
process when it malfunctions. process when it malfunctions.
There is a window of time between the crash of the coordinator and the There is a window of time between the crash of the coordinator and the
restarting of the coordinator, during this time, players can not be seated restarting of the coordinator, during this time, players cannot be seated
by new tables, and can not disconnect from the server. by new tables, and cannot disconnect from the server.
This window of time is very small, and the unavailability of the coordinator This window of time is very small, and the unavailability of the coordinator
process should not be noticed by more than a short time lag for the clients. process should not be noticed by more than a short time lag for the clients.
\end_layout \end_layout
@ -7639,7 +7638,7 @@ In the second testing session the delay between the server and clients was
A connection can be seen between those values, as long as the server is A connection can be seen between those values, as long as the server is
under moderate load the delay is low and stable. under moderate load the delay is low and stable.
When the load on the server increases heavily the delay does the same, When the load on the server increases heavily the delay does the same,
this is because the server can not process all incoming messages and therefore this is because the server cannot process all incoming messages and therefore
messages are put in a queue within the system. messages are put in a queue within the system.
\end_layout \end_layout
@ -7650,7 +7649,7 @@ status collapsed
\begin_layout Plain Layout \begin_layout Plain Layout
Important things to note are that the number of clients is not a good way Important things to note are that the number of clients is not a good way
of measuring the performance of the server because the server is possible of measuring the performance of the server because the server is possible
to have a large number of clients on the server but it can not handle all to have a large number of clients on the server but it cannot handle all
the information. the information.
Instead the performance of the server should be measured in the number Instead the performance of the server should be measured in the number
of messages it can handle per second. of messages it can handle per second.