1. Linux C/C++ logging
A journey into speed...
Mark Veltzer
Mark.veltzer@gmail.com

2. Speeding up syslog
● Filter the messages at the source
● Letting syslog filter out your messages
according to various parameters
● Have a separate hard drive just for logging (to
avoid IO pressure on the main one)
● Telling syslog to put your log messages in
RAM instead of permanent storage

3. Putting syslog output in RAM
● It usually OK for many many systems out there
● Does not add to the load on the IO system (you
don't usually have a spare drive)
● Makes syslog perform much faster in a log of
the synchronous implementations of syslog out
there
● Should be rotated or removed from time to
time, ofcourse

4. Various syslog implementations
● rsyslog
● syslog-ng
● klogd
● Busybox syslogd
● dsyslog
● inetutils-syslogd
● sysklogd

5. Logging libraries
● syslog native API
● evtlog
● ACE
● Boost
● Liblog4c
● Liblog4cpp
● socklog
● bobcat
● vanessa-logger

6. Logging from the command line
● Use the logger(1) utility
● Part of the bsdutils package
● Example: logger hello
● Many options to control priority, tag, socket,
process id logging and more
● Good for scripts and languages that do not
have a more integrated API to syslog

7. Logging from the command line
● Use the logger(1) utility
● Part of the bsdutils package
● Example: logger hello
● Many options to control priority, tag, socket,
process id logging and more
● Good for scripts and languages that do not
have a more integrated API to syslog