OpenEuphoria

Re: Interesting Experiment With String/Sequence Slicing

• Posted by Robert Craig <rds at RapidEuphoria.com> Aug 21, 2001
• 393 views

Sam Lie writes:
> i have ran the profiler and the bottle neck still
> shows up when doing string slicing. 

I gather from your earlier private e-mail that you are reading huge
strings from a file and running match() on them.
Or perhaps the string *is* the whole file?

Since match() starts at the beginning of a sequence,
and stops when it encounters a match, I gather
you are slicing the 50K strings to look for further matches.

Try reading and searching one line at a time using gets().
You won't be copying a huge string when you have a match,
and you'll make better use of the Pentium on-chip cache,
e.g.
      object line
      integer fn

      fn = open("myfile.html", "r")
      while 1 do
            line = gets(fn)
            if atom(line) then
                exit
            end if
            if match("foobar", line) then
                .....
            end if
      end while
      close(fn)

After doing the above, if you are still convinced that 
slicing is the culprit, you could write your own match() 
that locates multiple occurrences without slicing. 
(There may be an example in the mailing list archives.)

Regards,
   Rob Craig
   Rapid Deployment Software
   http://www.RapidEuphoria.com