alpine linux: pmap output not showing RSS

问题

I have a docker container running a base image of alpine linux and when I exec into the docker container and run the command:

pmap -x [pid]

The headers that I see in the output are:

Address Kbytes PSS Dirty Swap Mode Mapping

I am actually explicitly looking for RSS (Resident Set Size). Why is this header not showing up in the output?

回答1:

If pmap does not display it in that particular docker image (Alpine), check if top if more complete in its output (as in this thread):

vagrant@dockerdev:/host/scratch/janus-gateway$ sudo docker run --name=mc_small --detach --publish=11213:11211 --user=nobody ploxiln/memcached /bin/memcached -v -m 64 -c 1024
  11037b69acfbc0de7601831634751cd342a7bafe9a25749285bc2c2803cc1768
  vagrant@dockerdev:/host/scratch/janus-gateway$ top c -b -n1 | grep 'COMMAND\|memcached'
    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
   5984 nobody    20   0  316960   1192    768 S   0.0  0.1   0:00.02 /usr/bin/memcached -v -m 64 -c 1024
   6091 nobody    20   0  305256    780    412 S   0.0  0.0   0:00.00 /bin/memcached -v -m 64 -c 1024

The RES column would be the REsident set Size.

来源：https://stackoverflow.com/questions/38624052/alpine-linux-pmap-output-not-showing-rss