RE: Software for Statistical Profiling [7:58277]
Thanks for the info - I was looking at using the ErlangC model due to the nature of computer networks. Currently, my modelling is based on assuming an application takes 2 seconds to complete a task if it had 32kbps of bandwidth reserved for it, I can use the Erlang model to calculate whether 95% of transactions can be completed within say 2.3 seconds (with the 0.3 seconds being queue delay) - but by changing the bandwidth I change my underlying assumption of 2 seconds. Ie, if I allocate 64kbps, then the application may only takes 1.2 seconds and my model changes accordingly. The traditional Erlang model applies well on a packet-by-packet basis (just like queues of people in the bank, etc), but I'm not sure of its applicability to a series of packets on a whole which make up a transaction. Regards Richard -Original Message- From: charles dunkirk [mailto:[EMAIL PROTECTED]] Sent: Saturday, 30 November 2002 12:38 AM To: [EMAIL PROTECTED] Subject: Re: Software for Statistical Profiling [7:58277] Try here for erlang calculator http://www.erlang.com/ There are 2 type B and C . B assumes blocked calls don't call back and C assumes they stay in queue. Chuck Dunkirk The Long and Winding Road wrote: >Richard, the software used for your telephone booth problem is called >an Ehrlang calculator. it seems that you could use an Ehrlang >calculator to do this as well. There are a number of web sites that >have Ehrlang calcs. A google search should reveal a bunch of them. > >A long time ago, in statistics class, we used to do something called >"monte carlo simulations" to figure out stuff like this also. I don't >remember much about the mechanics. Got a statistics professor on you >campus? > >Chuck > >-- >TANSTAAFL >"there ain't no such thing as a free lunch" > > > > >""Larkin, Richard"" wrote in message >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > >>I recall in Uni that we used te Poisson distribution and some >>mathematical formulae to say that if we have x people arrive per hour >>at a phone booth, and the average phone call is y minutes, we would >>need z phone booths to ensure that 95% of the time, people don't have >>to wait (or only have to >> >wait > >>xx minutes). >> >>Transposing this to application budgeting, I have an application at a >> >remote > >>site which has a max of 5 concurrent users and the worst transaction >>they >> >do > >>will hog the 64kbps line for 30 seconds (if it is the only >>transaction). >> >>My question is without revising my lecture notes, what software would >>help me determine what bandwidth to allocate this application so that >>95% (or >>whatever) of the time the transaction can be completed in yy seconds? >> >>Is there any good software out there which would help me with this? >> >>Cheers >>Rik Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=58379&t=58277 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Software for Statistical Profiling [7:58277]
Try here for erlang calculator http://www.erlang.com/ There are 2 type B and C . B assumes blocked calls don't call back and C assumes they stay in queue. Chuck Dunkirk The Long and Winding Road wrote: >Richard, the software used for your telephone booth problem is called an >Ehrlang calculator. it seems that you could use an Ehrlang calculator to do >this as well. There are a number of web sites that have Ehrlang calcs. A >google search should reveal a bunch of them. > >A long time ago, in statistics class, we used to do something called "monte >carlo simulations" to figure out stuff like this also. I don't remember much >about the mechanics. Got a statistics professor on you campus? > >Chuck > >-- >TANSTAAFL >"there ain't no such thing as a free lunch" > > > > >""Larkin, Richard"" wrote in message >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > >>I recall in Uni that we used te Poisson distribution and some mathematical >>formulae to say that if we have x people arrive per hour at a phone booth, >>and the average phone call is y minutes, we would need z phone booths to >>ensure that 95% of the time, people don't have to wait (or only have to >> >wait > >>xx minutes). >> >>Transposing this to application budgeting, I have an application at a >> >remote > >>site which has a max of 5 concurrent users and the worst transaction they >> >do > >>will hog the 64kbps line for 30 seconds (if it is the only transaction). >> >>My question is without revising my lecture notes, what software would help >>me determine what bandwidth to allocate this application so that 95% (or >>whatever) of the time the transaction can be completed in yy seconds? >> >>Is there any good software out there which would help me with this? >> >>Cheers >>Rik Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=58289&t=58277 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Software for Statistical Profiling [7:58277]
Richard, the software used for your telephone booth problem is called an Ehrlang calculator. it seems that you could use an Ehrlang calculator to do this as well. There are a number of web sites that have Ehrlang calcs. A google search should reveal a bunch of them. A long time ago, in statistics class, we used to do something called "monte carlo simulations" to figure out stuff like this also. I don't remember much about the mechanics. Got a statistics professor on you campus? Chuck -- TANSTAAFL "there ain't no such thing as a free lunch" ""Larkin, Richard"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I recall in Uni that we used te Poisson distribution and some mathematical > formulae to say that if we have x people arrive per hour at a phone booth, > and the average phone call is y minutes, we would need z phone booths to > ensure that 95% of the time, people don't have to wait (or only have to wait > xx minutes). > > Transposing this to application budgeting, I have an application at a remote > site which has a max of 5 concurrent users and the worst transaction they do > will hog the 64kbps line for 30 seconds (if it is the only transaction). > > My question is without revising my lecture notes, what software would help > me determine what bandwidth to allocate this application so that 95% (or > whatever) of the time the transaction can be completed in yy seconds? > > Is there any good software out there which would help me with this? > > Cheers > Rik Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=58286&t=58277 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Software for Statistical Profiling [7:58277]
I recall in Uni that we used te Poisson distribution and some mathematical formulae to say that if we have x people arrive per hour at a phone booth, and the average phone call is y minutes, we would need z phone booths to ensure that 95% of the time, people don't have to wait (or only have to wait xx minutes). Transposing this to application budgeting, I have an application at a remote site which has a max of 5 concurrent users and the worst transaction they do will hog the 64kbps line for 30 seconds (if it is the only transaction). My question is without revising my lecture notes, what software would help me determine what bandwidth to allocate this application so that 95% (or whatever) of the time the transaction can be completed in yy seconds? Is there any good software out there which would help me with this? Cheers Rik Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=58277&t=58277 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
