<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">There is still one in XCode tools. It’s a alternate download: <a href="https://developer.apple.com/download/more/?q=Additional Tools for Xcode" class="">https://developer.apple.com/download/more/?q=Additional%20Tools%20for%20Xcode</a><div class="">Of course this is limited to OSX, but it’s there.</div><div class=""><br class=""><div class="">
<div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">Sincerely,<br class=""><br class="">Eric Tykwinski<br class="">TrueNet, Inc.<br class="">P: 610-429-8300</div>
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<div><br class=""><blockquote type="cite" class=""><div class="">On Apr 8, 2020, at 10:33 PM, Lee <<a href="mailto:ler762@gmail.com" class="">ler762@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">On 4/7/20, Adam Thompson <<a href="mailto:athompson@merlin.mb.ca" class="">athompson@merlin.mb.ca</a>> wrote:<br class=""><blockquote type="cite" class="">I’m looking for a practical guide – i.e. specifically NOT an academic paper,<br class="">thanks anyway – to predicting the effect of increased (or decreased) latency<br class="">on my user’s applications.<br class=""><br class="">Specifically, I want to estimate how much improvement there will be in<br class="">{bandwidth, application XYZ responsiveness, protocol ABC goodput, whatever}<br class="">if I decrease the RTT between the user and the server by 10msec, or by<br class="">20msec, or by 40msec.<br class=""><br class="">My googling has come up with lots of research articles discussing<br class="">theoretical frameworks for figuring this out, but nothing concrete in terms<br class="">of a calculator or even a rule-of-thumb.<br class=""></blockquote><br class="">There used to be network simulators that claimed to figure that out for you - eg<br class=""><a href="https://opnetmodeler.wordpress.com/" class="">https://opnetmodeler.wordpress.com/</a><br class=""> "Predict application performance using real traffic in a simulated mode"<br class=""><br class="">I suspect all that died after encryption became the norm, since you<br class="">have to be able to see and understand what's going on before you can<br class="">predict what will happen after changing the network. Take a look at<br class="">https://www.cse.wustl.edu/~jain/cse567-08/ftp/simtools/index.html<br class=""> the date is 2008 and all the references are http://xxx (or maybe I<br class="">can't search worth beans & missed all the current references)<br class=""><br class="">Or maybe simulation just got too expensive? I vaguely recall sitting<br class="">through a few OPNET sales pitches in the early 2000s & people getting<br class="">excited about the product until they found out how much it cost :(<br class=""><br class="">Regards,<br class="">Lee<br class=""><br class=""><br class=""><blockquote type="cite" class=""><br class="">Ultimately, this goes into MY calculator – we have the usual north-american<br class="">duopoly on last-mile consumer internet here; I’m connected directly to only<br class="">one of the two. There’s a cost $X to improve connectivity so I’m peered<br class="">with both, how do I tell if it will be worthwhile?<br class=""><br class="">Anyone got anything at all that might help me?<br class=""><br class="">Thanks in advance,<br class="">-Adam<br class=""><br class="">Adam Thompson<br class="">Consultant, Infrastructure Services<br class="">[[MERLIN LOGO]]<https://www.merlin.mb.ca/><br class="">100 - 135 Innovation Drive<br class="">Winnipeg, MB, R3T 6A8<br class="">(204) 977-6824 or 1-800-430-6404 (MB only)<br class="">athompson@merlin.mb.ca<mailto:athompson@merlin.mb.ca><br class="">www.merlin.mb.ca<http://www.merlin.mb.ca/><br class=""><br class=""><br class=""></blockquote></div></div></blockquote></div><br class=""></div></body></html>