namedprocess_namegroup_read_bytes_total seems to be always zero

[martivo]

Hi,
it seems namedprocess_namegroup_read_bytes_total is always 0.
namedprocess_namegroup_write_bytes_total seems to be OK.

Using latest version 0.4.0

# uname -a
Linux driver 3.8.0-44-generic #66~precise1-Ubuntu SMP Tue Jul 15 04:01:04 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Configuration:

process_names:
  - exe: 
    - /opt/java/jdk1.8.0_92/bin/java
    cmdline: 
    - com.connecty.collector.DataCollector
    name: collector
  - exe:
    - /opt/java/jdk1.8.0_92/bin/java
    cmdline:
    - -Dcatalina.base=/var/lib/tomcat/fm
    name: fm
  - exe:
    - /opt/java/jdk1.8.0_92/bin/java
    cmdline:
    - -Dcatalina.base=/var/lib/tomcat/mk3
    name: mk3
  - exe:
    - node
    name: node
  - exe:
    - /usr/bin/redis-server
    name: redis

[ncabatoff]

Sorry I never got back to you @mardicas. Ultimately this is an OS question, how Linux assigns these counters is complicated and I've never fully understood it. I don't take the I/O metrics too literally, as noted in the README, though they can be useful sometimes e.g. to figure out which process is causing a lot of disk of activity. See #95 for an example demonstrating that the counters can be nonzero.

[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.