ReadVarsEso message

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If you have all OutputControl:Files set to No then EnergyPlus will not output a MTR file nor ESO file. The ESO file must be output for ReadVarsESO to function.

If performance is a concern, I would suggest using the native C++ CSV output instead of ReadVarsESO. To do this, you need to select Yes for Output CSV in theOutputControl:Files. If you use the native CSV output, you can keep all the files in OutputControl:Files turned off. One thing to note is to make sure you do not use the -r flag on the command line interface otherwise it will still try to use ReadVarsESO even if you've request native CSV output within the IDF.

Well, these don't hurt anything and should take very little time. But if you do want to eliminate this you can edit RunEPlus.bat in the root directory and either comment the problem lines out or come up with other logic for processing. I suspect it is the IF NOT EXIST lines that are calling ReadVarsESO.exe.

:  7&9. Run Post Processing Program(s)
if %maxcol%==250     SET rvset=
if %maxcol%==nolimit SET rvset=unlimited
: readvars creates audit in append mode.  start it off
echo %date% %time% ReadVars >readvars.audit

IF EXIST eplusout.inp %post_proc%ReadVarsESO.exe eplusout.inp %rvset%
IF NOT EXIST eplusout.inp %post_proc%ReadVarsESO.exe " " %rvset%
IF EXIST eplusmtr.inp %post_proc%ReadVarsESO.exe eplusmtr.inp %rvset%
IF NOT EXIST eplusmtr.inp echo eplusout.mtr >test.mvi
IF NOT EXIST eplusmtr.inp echo eplusmtr.csv >>test.mvi
IF NOT EXIST eplusmtr.inp %post_proc%ReadVarsESO.exe test.mvi %rvset%
IF EXIST eplusout.bnd %post_proc%HVAC-Diagram.exe