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Re: [hobbit] Server-side extension scripts: shell vs. C programming



On 6/28/07, Daniel Bourque <dbourque (at) weatherdata.com> wrote:

 Too bad you didn't write it in perl, then you could have just used
perlcompile to spit out C code for actual compiling.

About shell and other interpreted languages, what gets expensive is
looping, since for each loop iteration you must interpret, compile, and run
each lines in that loop. With shell script, add to that forking, which is
expensive too.

On modern computers, the time saved might not be worth dealing with
recoding your script in C. All the "magic" stuff like back ticks is not very
fun to implement in C. Plus you have to deal with a strictly typed language,
no automatic memory management, etc

you'd be better off recoding it in perl. then you'll have an easy way to
get it in C and see if that really saves you time.


The main reason I need something other than shell is because I need to do
some work with arrays that I can't do in shell.  I may end up just using
perl instead of C.

Daniel Bourque
Systems/Network Administrator
Weather Data Inc

Office (316) 266-8013
Office (316) 265-9127 ext. 3013
Mobile (316) 640-1024



Gary Baluha wrote:

I remember reading somewhere in the Hobbit documentation that when an
extension script starts to do a lot of things, it should be coded in a
compiled language such as C, instead of as a shell script.  I have a custom
script that takes a lot of data and converts it into NCV graphs, and I
believe it is at the point where I should consider rewriting it in C.

Before I get to far into it, is the hobbitd_sample.c something that I
should look at for this?  I'm not sure if I'm reading the documentation on
it correctly, if it is a good example for an external script.  Has anyone
else had experience in needing to convert a shell script to C/C++/etc for
Hobbit?  I'm just trying to get a rough idea of how much effort this will
require.