Most cloud vendors limit throughput based on instance size, did you run your cloud test on a varying size of instnaces per vendor, or roughly the same size on both vendors?
-n On Fri, Jan 10, 2014 at 12:03 PM, Andrew Hume <and...@research.att.com> wrote: > we (i and a colleague) have a system where we probe a large number of > IP addresses out there in the Internet. A probe consists of opening > a http URL on that system and when we get back the (expected) 401 > response, we close the connection. about 7% of the time, we get no response > and we close the connection after several seconds. > > for more or less any Intel-style server, we can run about 500-1000 > probes per second (via a driver program with 50-100 threads). > > here’s the unexpected part: we go to a cloud vendor and run this program > in a few instances, but no matter how many instances we run, once we get > to about 1000 probes/s total, additional instances or driving rates do not > increase the total rate, but simply increase packet loss and the number of > calls > from the cloud vendor. > > we’ve tried this on SIlverLining (an AT&T cloud) and RackSpace, with > pretty much identical results. we’ve hypothesized this as a limit of a > site-wide > NAT box or some such, but it seems unlikely. before we go repeat this > experiment > with other cloud vendors, does anyone have any comments on what this might > be > or if other vendors might do better or worse? > > andrew > > ----------------------- > Andrew Hume > 949-707-1964 (VO and best) > 732-420-0907 (NJ) > and...@research.att.com > > > > > _______________________________________________ > Tech mailing list > Tech@lists.lopsa.org > https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech > This list provided by the League of Professional System Administrators > http://lopsa.org/ > -- ------------------------------------------- nathan hruby <nhr...@gmail.com> metaphysically wrinkle-free ------------------------------------------- _______________________________________________ Tech mailing list Tech@lists.lopsa.org https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
