Ben Coman wrote > On Sat, 2 Feb 2019 at 18:54, ducasse < > stepharo@
> > wrote: > > ... > > 3. Ticked "Free tier only" filter. > + Selected "Amazon Linux 2 AMI (HVM), SSD Volume Type" > + Clicked > <Review and Launch> > (used default t2.micro) > + Clicked > <Launch> > + From the pull-down selected "Create a new key pair", > gave it a name and clicked > <Download Keypair> > saved as > "SydneyPharoSpeedTest.pem" > + Clicked > <Launch Instance> > + Clicked > <View Instances> > noted instance... > * IP address: 54.252.136.78 > * Zone: ap-southeast-2b > * Security Group: Launch Wizard 1 > > 4. On my Windows 10 box, in WSL did... > $ cd ~/.ssh # if it doesn't exist, first do... mkdir -m 700 ~/.ssh > $ cp /mnt/c/Users/Ben/Downloads/SydneyPharoSpeedTest.pem ~/.ssh > $ chmod 400 ~/.ssh/SydneyPharoSpeedTest.pem > $ ssh -i ~/.ssh/SydneyPharoSpeedTest.pem ubuntu@54.252.136.78$ cat > /etc/os-release > ID="amzn" > ID_LIKE="centos rhel fedora" > > > GOOD NETWORK BASELINE TEST... > Ignoring any packet loss on poor networks, first testing low bandwidths on > a good network > $ vi test.sh > #!/bin/sh > if [ -d out ]; then > dirdate=`stat -c %z out | awk '{print $1"-"$2}' ` > mv out out.${dirdate} > fi > mkdir out > for RATE in 1000k 500k 200k 100k 50k 20k 10k 5k 2k 1k > do > echo $RATE > /usr/bin/time -f "%e" -o out/time.$RATE \ > wget --quiet --limit-rate $RATE > https://files.pharo.org/pharo-launcher/1.6/pharo-launcher-1.6.msi -O > out/file.$RATE & > done > > $ sh test.sh > monitoring with... > $ cat out/time* | sort -n > $ ls -lS out > > results in following table and graphs... > $RATE > (kb/s) TIME > (s) TIME > (min) TIME > (hr) > 1000 54 1 0.0 > 500 105 2 0.0 > 200 259 4 0.1 > 100 515 9 0.1 > 50 1029 17 0.3 > 20 2576 43 0.7 > 10 5149 86 1.4 > 5 10527 175 2.9 > > [image: download-speed.png] > > Wow that surprised me. I'm not sure what the behaviour of file servers at > low bandwidth should be, > but intuitively the above seems odd. In the past troubleshooting seems to > have been > focused on the cause of slow speeds, but these can occur for many reasons > unrelated to the > the file server. The above test ignores cause to isolate behaviour at > slow > speeds. > > I forgot my own download speed yesterday (today is okay), but here is > another sample... > "(in Argentina) it is really slow ... 3.5KB/s ... average 10KB/s". > http://forum.world.st/Pharo-Downloads-are-sluggish-td5084963.html > > I would hope that download time was near linear with speed all the way > down > to 1kb/s. > Anyone have some sysadmins they can lean on to understand if that is > realistic? > > The straightness of the line using a log-log axis makes it seem like > policy > rather than physics. > [image: download-speed(log).png] > > HTH, > cheers -ben > > > download-speed.png (39K) > <http://forum.world.st/attachment/5094677/0/download-speed.png> > download-speed(log).png (34K) > <http://forum.world.st/attachment/5094677/1/download-speed%28log%29.png> Why does that surprise you? Download time [s] = amount of data [B] / bandwidth [B/s]. Your data and graphs look exatly like they should. When bandwidth -> 0, time -> +infinity. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Developers-f1294837.html