jpetazzo

jpetazzo

So this is on my "puny" i7, which is a "Intel(R) Core(TM) i7-2720QM CPU @ 2.20GHz".
During the bench I think it was running at 2 GHz, and it's supposed to be able to boost at 3.3 GHz.
(But I hard-capped the speed because I don't like when my laptop starts to levitate because of fanspeed ;-))


The 'numbers' are in 1000s of bytes per second processed.
type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes
md2                  0.00         0.00         0.00         0.00         0.00 
mdc2                 0.00         0.00         0.00         0.00         0.00 
md4              21071.83k    63368.19k   147767.22k   221280.60k   258719.74k

jpetazzo

First, we need recent btrfs tools. Otherwise, we're entering a world of pain.

So:

apt-get build-dep btrfs-tools
apt-get install liblzo2-dev libblkid-dev
git clone git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-progs.git
make -j -C btrfs-progs

jpetazzo

#!/bin/sh
sudo sh -c 'for CPU in /sys/devices/system/cpu/cpu[0-9]* ; do echo powersave > $CPU/cpufreq/scaling_governor ; done'
sudo sh -c 'for CPU in /sys/devices/system/cpu/cpu[0-9]* ; do echo  800000 > $CPU/cpufreq/scaling_min_freq ; done'
sudo sh -c 'for CPU in /sys/devices/system/cpu/cpu[0-9]* ; do echo 2000000 > $CPU/cpufreq/scaling_setspeed ; done'
sudo sh -c 'for CPU in /sys/devices/system/cpu/cpu[0-9]* ; do echo 2000000 > $CPU/cpufreq/scaling_max_freq ; done'

jpetazzo

Get little rootfs from https://github.com/jpetazzo/docker-busybox/blob/master/tarmaker-buildroot/rootfs.tar

mkdir c1 c2
sudo tar -C c1 -xf rootfs.tar
sudo tar -C c2 -xf rootfs.tar

Now we will prepare c1 to host a shared mount with c2:

jpetazzo

FROM ubuntu
ADD run.sh /
CMD bash

jpetazzo

Base 27 encoding

This is just for lulz.

• Take a character string (ASCII8, no character >242).
• Transform each byte into a sequence of 5 trinary digits (i.e. from 00000 to 22222).
• Concatenate all trinary digits (i.e. a long sequence of 0, 1, and 2).
• Add extra 0s at the end so that the total length is divisible by 3.
• Break down by groups of 3.
• Transform each group of 3 into an integer, ranging from 0 to 26.

jpetazzo

#!/bin/sh
exec docker run -t \
     -v /var/run/docker.sock:/var/run/docker.sock \
     -v /:/hostfs -w /hostfs/$(pwd) \
     fig fig "$@"

jpetazzo

1. Start container
2. Create view.sh
3. Create a FIFO with mkfifo /tmp/view
4. Have a writer on the FIFO: just leave cat >/tmp/view running somewhere
5. Run socat TCP-LISTEN:8080,reuseaddr,fork EXEC:/path/to/view.sh
6. Whenever you want to kick everybody out, you can kill socat or kill the cat process :-)

jpetazzo

FROM ubuntu:14.04
RUN apt-get update -q
RUN apt-get install -qy chromium-chromedriver
RUN apt-get install -qy python3-pip
RUN apt-get install -qy xvfb
RUN apt-get install -qy x11vnc
RUN pip3 install IPython
RUN pip3 install selenium
RUN pip3 install PyYAML
RUN touch /credentials.yml