This parameter specifies whether Dyalog APL should optimise ⎕FCHK by allowing it to reliably determine whether a component file had been properly untied and therefore does not need to be checked (this is overridable using the ⎕FCHK option force).
Optimising ⎕FCHK in this way has a performance impact on ⎕FUNTIE and it is recommended this optimisation is switched off if your application frequently ties and unties files.
Note: this only affects component files with journaling enabled.
The values of the parameter are:
| 0 | Do not optimise ⎕FCHK (optimise ⎕FUNTIE instead) |
| 1 | Optimise ⎕FCHK |
The default value of the parameter is 0 on all platforms. On Windows, setting the value 1 has no effect.