Test Write:

mkdir /data-notmapped && mkdir /data

dd if=/dev/zero of=/data-mapped/largefile bs=1M count=100

dd if=/dev/zero of=/data/largefile bs=1M count=100

dd if=/dev/zero of=/data-notmapped/largefile bs=1M count=100

READ SPEED

dd if=/data/largefile of=/dev/null bs=4k

dd if=/data-mapped/largefile of=/dev/null bs=4k

dd if=/data-notmapped/largefile of=/dev/null bs=4k

Exit container: exit

Switch to DeviceMapper (environment doesn't have AUFS)

sed -i 's/overlay/devicemapper/' /etc/systemd/system/docker.service
systemctl daemon-reload
systemctl restart docker

Rebuild: docker build -t benhall/ioperf-example .

Start: docker run -it -v /data-mapped:/data-mapped benhall/ioperf-example bash

Test Write:

mkdir /data-notmapped && mkdir /data

dd if=/dev/zero of=/data-mapped/largefile bs=1M count=100

dd if=/dev/zero of=/data/largefile bs=1M count=100

dd if=/dev/zero of=/data-notmapped/largefile bs=1M count=100

READ SPEED

dd if=/data/largefile of=/dev/null bs=4k

dd if=/data-mapped/largefile of=/dev/null bs=4k

dd if=/data-notmapped/largefile of=/dev/null bs=4k

docker run -it --tmpfs=/tmp2 ubuntu bash

dd if=/dev/zero of=/tmp2/largefile bs=1M count=100

dd if=/dev/zero of=/tmp2/large bs=1M count=64