Oups, it seems that my mail client was lagging... Le dim. 3 févr. 2019 à 17:19, Nicolas Cellier < nicolas.cellier.aka.n...@gmail.com> a écrit :
> Ben, > The figures in the table are quite linear. > Duration * rate = constant. > > It's just that you want to plot 1/ duration or 1/ rate if you don't want > to see an hyperbole x×y=cte > > Le dim. 3 févr. 2019 à 12:17, ducasse <steph...@netcourrier.com> a écrit : > >> Wouahhhhhh you are not playing :) >> This is cool. >> My network at home is lame to the dispear of my sons. >> >> Stef >> >> >> On 3 Feb 2019, at 12:06, Ben Coman <b...@openinworld.com> wrote: >> >> >> On Sat, 2 Feb 2019 at 18:54, ducasse <steph...@netcourrier.com> wrote: >> > On Sat, 2 Feb 2019 at 11:01, Ben Coman <b...@openinworld.com> wrote: >> > >> > > I am getting network errors trying to download latest Pharo Launcher, >> > >> > can you tell me how so that I try to reproduce it? >> >> Since network performance depends a lot on location, and presuming you'd >> need to be at my house to reproduce my experience, >> I spent the afternoon learning about AWS so I could do some testing from >> a Australian based cloud box >> that you should be able to reproduce fairly easily, since this was my >> first time using AWS. >> >> With this 10 minute tutorial... >> [Launch a Linux Virtual Machine]( >> https://aws.amazon.com/getting-started/tutorials/launch-a-virtual-machine/ >> ) >> 1. Signed up and signed in >> Tip: I struggled a long while looping on "Sign in with root account >> credentials" until I discovered I needed to use the email address I signed >> up with, not the account name. >> >> [Edit:] In the top right between account name and support, >> pulled down list and selected "Asia Pacfic (Sydney)" >> >> >> 2. Clicked "Launch a virtual machine" >> (note, that only seems to show up for blank account, otherwise its >> "Launch Instance" >> >> >> 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 >> >> <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. >> <download-speed(log).png> >> >> HTH, >> cheers -ben >> >> >>
