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

[Vlad S. <vl...@cr...>]

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?

Zoran Vasiljevic wrote:
> 
> Am 01.06.2005 um 20:19 schrieb Zoran Vasiljevic:
> 
>>> I don't see anything wrong with using Tcl_VFS* directly to read the
>>> config file, write to a log file etc., and the tcl commands in
>>> nsd/tclfile.c should be replaced by simple Tcl wrappers anyway.  It's
>>> the stuff in nsd/fastpath.c that's important.  File descriptors need
>>> to be available for use with modern, high performance system calls
>>> with a minimum of conditional compilation/execution.
>>>
>>> This also has the potential to be a never-ending bug hunt.   Absolutely
>>> every call to the file system has to be converted to Tcl_VFS* or
>>> Ns_VFS*, including all modules and the libraries they wrap, or people
>>> will be surprised...
>>
>>
>>> I'm not against this feature, but it's pretty esoteric and the
>>> implementation is invasive so the quality bar needs to be set high.
>>> I'm sure you can do it  :-)
>>
>>
> 
> 
> I have thought about all this...
> 
> We do have consensus on fact that fastpath code is actually the
> core of the performance respective the filesystem access. All
> other parts where files are read and/or written is not speed
> relevant. Correct?
> 
> Now, if I simplify the above task by making the *rest* of the
> server VFS aware (replacing all native FS calls with Tcl wrappers)
> and add one additional config-option to fastpath code like the
> mmap is today?
> So, one who needs to serve pages out of container files, would
> simply toggle the:
> 
>    ns/server/$server/fastpath/vfs
> 
> switch to 1 (the default would be zero: not use vfs).
> This way, the task is pretty simple and straight-forward.
> 
> What do you think?
> 
> Zoran
> 
> 
> 
> 
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Vlad Seryakov
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