namedprocess_namegroup_read_bytes_total and namedprocess_namegroup_write_bytes_total always 0

[lumi017]

namedprocess_namegroup_read_bytes_total and namedprocess_namegroup_write_bytes_total seems not be functional. They always report 0. Using the latest version available: 0.5.0
Example of the config:

      - name: "{{.Comm}}"
        comm:
          - dockerd
          - python

Might be related to #66

[ncabatoff]

I have no problem making write_bytes_total nonzero, e.g. in one window run

dd if=/dev/zero of=test bs=1M

and in another window run

$ /opt/process-exporter/bin/process-exporter  -procnames dd -once-to-stdout-delay=5s |grep bytes_total |grep -v memstats
2019/05/03 02:12:46 Reading metrics from /proc for procnames: [dd]
# HELP namedprocess_namegroup_read_bytes_total number of bytes read by this group
# TYPE namedprocess_namegroup_read_bytes_total counter
namedprocess_namegroup_read_bytes_total{groupname="dd"} 0
# HELP namedprocess_namegroup_write_bytes_total number of bytes written by this group
# TYPE namedprocess_namegroup_write_bytes_total counter
namedprocess_namegroup_write_bytes_total{groupname="dd"} 3.178496e+07

To see read_bytes_total nonzero, it's a little trickier, but this worked for me:

WARNING: do not drop_caches on production systems

Window 1:

$ echo 3 | sudo tee /proc/sys/vm/drop_caches
$ dd if=test of=/dev/null bs=1

Window 2:

$ /opt/process-exporter/bin/process-exporter  -procnames dd -once-to-stdout-delay=5s |grep bytes_total |grep -v memstats
2019/05/03 02:14:31 Reading metrics from /proc for procnames: [dd]
# HELP namedprocess_namegroup_read_bytes_total number of bytes read by this group
# TYPE namedprocess_namegroup_read_bytes_total counter
namedprocess_namegroup_read_bytes_total{groupname="dd"} 2.62144e+06
# HELP namedprocess_namegroup_write_bytes_total number of bytes written by this group
# TYPE namedprocess_namegroup_write_bytes_total counter
namedprocess_namegroup_write_bytes_total{groupname="dd"} 0

[toyota790]

Hi @ncabatoff ,

I have the same this issue in my environment.

• OS: Ubuntu 16.04 LTS
• Process exporter version: 0.6.0

Do you have any idea what's causing this problem?
If you need any further information, please feel free to contact me. Thank you so much! :)

[diborodin]

Faced the same issue. Please make sure the process-exporter processes is run with the root user privileges, otherwise namedprocess_namegroup_read_bytes_total and namedprocess_namegroup_write_bytes_total are both 0.