Hello, Germán Diago <germandi...@gmail.com> writes:
> Hello everyone,
>
> I did a script that parses some file with the GDP since 1970 for many
> countries. I filter the file and discard uninteresting fields, later I
> write in a format suitable for gnuplot.
>
Wow, you started programming before I was born!
> I did this in python and guile.
>
> In python it takes around 1.1 seconds in my raspberry pi.
>
> In Guile it is taking around 11 seconds.
>
> I do not claim they are doing exactly the same: in python I use arrays and
> dictionaries, in guile I am using mainly lists, I would like to know if you
> could give me advice on how to optimize it. I am just training for now.
>
I know very little about compiler optimization in general. But I
remember a trick in guile. In guile, *top level* definitions doesn't get
inlined, so you put everything in a big 'let', so that the compiler can
do its job.
For examples, instead of:
(define (f) (display "hello world"))
(define (g) (newline))
(f)
(g)
you write:
(let ()
(define (f) (display "hello world"))
(define (g) (newline))
(f)
(g))
In addition, in the guile REPL, you can see how your code is optimized
by running using the ',opt' command. For example:
,opt(let ()
(define (f) (display "hello world"))
(define (g) (newline))
(f)
(g))
gives:
$1 = (begin (display "hello world") (newline))
Hope these help!
> The scripts in both python and guile are attached and the profile data for
> scheme is below. Just place in the same directory the .csv file and it
> should generate an output file with the data ready for gnuplot :)
>
> % cumulative self
> time seconds seconds name
> 26.24 3.45 3.43 %read-line
> 20.51 2.68 2.68 string->number
> 15.54 2.05 2.03 string-delete
> 7.39 7.75 0.97 map
> 5.13 3.96 0.67 transform-data
> 4.07 1.75 0.53 format:format-work
> 3.17 0.41 0.41 string=?
> 2.87 0.37 0.37 string-ref
> 1.81 2.50 0.24 tilde-dispatch
> 1.81 0.24 0.24 number->string
> 1.51 0.34 0.20 is-a-digit
> 1.06 0.28 0.14 anychar-dispatch
> 1.06 0.14 0.14 display
> 1.06 0.14 0.14 string-length
> 1.06 0.14 0.14 char>=?
> 1.06 0.14 0.14 char<=?
> 1.06 0.14 0.14 string-split
> 0.60 0.08 0.08 length
> 0.45 0.49 0.06 format:out-num-padded
> 0.45 0.06 0.06 remove-dots
> 0.30 0.04 0.04 %after-gc-thunk
> 0.30 0.04 0.04 list-tail
> 0.30 0.04 0.04 write-char
> 0.15 3.53 0.02 loop
> 0.15 3.47 0.02 read-line
> 0.15 0.02 0.02 substring
> 0.15 0.02 0.02 list-ref
> 0.15 0.02 0.02 reverse!
> 0.15 0.02 0.02 #<procedure 2360350 at extract_gdp.scm:58:10
> (e)>
> 0.15 0.02 0.02 integer?
> 0.15 0.02 0.02 char=?
> 0.00 13.07 0.00 load-compiled/vm
> 0.00 13.07 0.00 #<procedure 18c6180 at ice-9/top-repl.scm:31:6
> (thunk)>
> 0.00 13.07 0.00 #<procedure 1a92e00 at ice-9/boot-9.scm:4045:3
> ()>
> 0.00 13.07 0.00 call-with-prompt
> 0.00 13.07 0.00 #<procedure 18c6100 at ice-9/top-repl.scm:66:5
> ()>
> 0.00 13.07 0.00 apply-smob/1
> 0.00 13.07 0.00 catch
> 0.00 13.07 0.00 #<procedure 1a919c0 at statprof.scm:655:4 ()>
> 0.00 13.07 0.00 run-repl*
> 0.00 13.07 0.00 save-module-excursion
> 0.00 13.07 0.00 statprof
> 0.00 13.07 0.00 start-repl*
> 0.00 11.22 0.00 #<procedure 1a8a170 ()>
> 0.00 3.53 0.00 call-with-input-file
> 0.00 1.85 0.00 call-with-output-file
> 0.00 1.79 0.00 for-each
> 0.00 1.75 0.00 format
> 0.00 0.14 0.00 get-fields
> 0.00 0.10 0.00 #<procedure 2d398a0 at extract_gdp.scm:48:18
> (year)>
> 0.00 0.06 0.00 #<procedure 2d021c8 at extract_gdp.scm:46:6 (p)>
> 0.00 0.02 0.00 format:out-obj-padded
> 0.00 0.02 0.00 remove
> 0.00 0.02 0.00 call-with-output-string
signature.asc
Description: PGP signature
