Re: [naviserver-devel] Re: RFE #1202462

[Zoran V. <zv...@ar...>]

Am 14.06.2005 um 15:39 schrieb Vlad Seryakov:

> My question is: will it affect service Tcl pages as well. For  
> example using templating system it opens .tcl and .adp files. Will  
> Vfs slow down the oevrall performance?


I expected this question!

I believe the overhead of processing an adp page (or Tcl procedure)
will *by far* exceede the actual open/read/close vs. the VFS equivalent.
I think we are there in sub-msec range whereas the actual adp/tcl
execution falls into the msec to 10's or 100's of msec.
I do not believe that this is going to be of any issue.
We can test this by adding a wrapper in the adpcode where the
file is read-in and checking the performance.

Note: the entire Tcl core is using those wrappers. That is, whatever
you do with files from Tcl, everything passes thru VFS layer.

Zoran