Workspace log : workspace/.metadata/.log. Configuration log : configuration/.logJust start the file eclipse.exe with this paramerters. 
eclipse -console -consoleLog -debug
  • -console : Open eclipse with a console
  • -consoleLog : prohibit the plug-ins to silently log entries to the log file
  • -debug : Most plug-ins take advantage of the debug options file mechanism that the runtime provides.
For more information, see here
Documentation
Task Runner