Janusgraph Docker memory allocation issue

Question

I am using janusgraph docker image

docker pull janusgraph/janusgraph:1.0.0

and when starting i am providing memory parameter

docker run --cpus 15.5 --rm -d --memory=8g --user 0 -e JAVA_OPTS="-Xms6g -Xmx8g" --ulimit memlock=-1 --ulimit nofile=100000 --ulimit nproc=65535 -p 0.0.0.0:8182:8182 --name myjanusgraph janusgraph/janusgraph:1.0.0

but still when i check docker stats it shows

CONTAINER ID NAME CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS

e6d6ed384fe9 myjanusgraph 0.21% 4.384GiB / 8GiB 54.80% 656B / 0B 3.28MB / 188kB 48

Not sure how do i allocate 8 gb to docker image.

Thanks, atul