On Fri, Sep 16, 2011 at 2:36 PM, Hal Murray <[email protected]> wrote: > > [email protected] said: >> You can forget Wall St. firms and Banks for starters. > >> They need sub-microsecond accurate timing as some instruments (Forex) are >> moving to <10 microsecond latency from order entry to order ack. > > 10 microsecond latency doesn't say anything about how accurate the time has > to be. > > Does anybody have a good URL on the accuracy requirements of banks and/or > stock markets? I expect there are both legal and technical issues. I'd like > to understand them separately
There are some big names in Banking and Stocks behind the Advanced Message Queuing Protocol (AMQP): http://www.amqp.org/confluence/display/AMQP/About+AMQP http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=amqp http://amqp.org/resources/financial-services Actually Time Nut Grade measurements are not addressed at this level to my knowledge. <p><b>Round Trip</b>: The term round trip refers to the process of a peer sending a command to its partner and receiving confirmation that the command is complete. Round trips are necessary for synchronization of world views, however, it is not necessary for a client to wait and do nothing while a round trip occurs or only deal with a single round trip at a time.</p> </li> <li> <p><b>Round Trip Time (RTT)</b>: The term RTT refers to the time taken to complete a round trip. This is described with the following formula:</p> <pre> RTT = 2*latency_network + latency_processing </pre> <p>Note that RTT at the execution layer differs from RTT at the network layer. At the network layer the processing latency is zero resulting in an RTT of twice the network latency. At the execution layer the processing time becomes significant if, for example, processing the command requires sending data to disk. This would be the case with durable messages and the RTT would then include the Broker's disk latency.</p> </li> > but I won't be surprised if they are thoroughly > tangled. http://www.imatix.com/articles:whats-wrong-with-amqp There is also the even more obscure 0MQ: http://www.zeromq.org/ -- http://blog.softwaresafety.net/ http://www.designer-iii.com/ http://www.wearablesmartsensors.com/ _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
