* Re: Is this a good use for "compile"
@ 2018-02-20 11:03 Mark Carter
0 siblings, 0 replies; 5+ messages in thread
From: Mark Carter @ 2018-02-20 11:03 UTC (permalink / raw)
To: guile-user
: It is not clear to me how this will work. First of all, compile may
generate machine-dependent code.
That's OK. Generated code doesn't need to be saved. Formulae are
compiled as needed.
: Second, how do you propose to evaluate my-cell-formulae ?
To evaluate a cell, I would call ((hash-ref my-cell-formula some-cell-ref))
Formulae are compiled to parameterless lambdas, which are stored in
my-cell-formulae, So all I need to do is retrieve the relevant one, and
execute it.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Is this a good use for "compile"
@ 2018-02-18 21:56 Mark Carter
2018-02-19 17:30 ` Matt Wette
2018-02-20 0:08 ` Vítor De Araújo
0 siblings, 2 replies; 5+ messages in thread
From: Mark Carter @ 2018-02-18 21:56 UTC (permalink / raw)
To: guile-user
New scheme user here.
Suppose I'm writing a spreadsheet. The user inputs a formula for a cell.
The plan is to use guile's peg parser to convert the formula into a
lambda expression, which I then compile in order to speed-up subsequent
processing.
So, suppose I convert the user's formula to a list, which turns out to
be, for example: '(lambda (x) (+ x 13)) and compile it and save it in a
formula table:
(hash-set! my-cell-formulae some-cell-ref (compile '(lambda (x) (+ x 13))))
So I can I expect a speed-up by having done the compile, as opposed to
an eval?
I assume the answer is "yes", but I wanted to check.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Is this a good use for "compile"
2018-02-18 21:56 Mark Carter
@ 2018-02-19 17:30 ` Matt Wette
2018-02-20 0:08 ` Vítor De Araújo
1 sibling, 0 replies; 5+ messages in thread
From: Matt Wette @ 2018-02-19 17:30 UTC (permalink / raw)
To: guile-user
On 02/18/2018 01:56 PM, Mark Carter wrote:
> New scheme user here.
>
> Suppose I'm writing a spreadsheet. The user inputs a formula for a cell.
>
> The plan is to use guile's peg parser to convert the formula into a
> lambda expression, which I then compile in order to speed-up
> subsequent processing.
>
> So, suppose I convert the user's formula to a list, which turns out to
> be, for example: '(lambda (x) (+ x 13)) and compile it and save it in
> a formula table:
>
> (hash-set! my-cell-formulae some-cell-ref (compile '(lambda (x) (+ x
> 13))))
>
> So I can I expect a speed-up by having done the compile, as opposed to
> an eval?
>
> I assume the answer is "yes", but I wanted to check
It is not clear to me how this will work. First of all, compile may
generate machine-dependent code. Second, how do you propose to evaluate
my-cell-formulae ?
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Is this a good use for "compile"
2018-02-18 21:56 Mark Carter
2018-02-19 17:30 ` Matt Wette
@ 2018-02-20 0:08 ` Vítor De Araújo
2018-02-20 9:28 ` Mark Carter
1 sibling, 1 reply; 5+ messages in thread
From: Vítor De Araújo @ 2018-02-20 0:08 UTC (permalink / raw)
To: Mark Carter, guile-user
On 18/02/2018 18:56, Mark Carter wrote:
> New scheme user here.
>
> Suppose I'm writing a spreadsheet. The user inputs a formula for a cell.
>
> The plan is to use guile's peg parser to convert the formula into a
> lambda expression, which I then compile in order to speed-up subsequent
> processing.
>
> So, suppose I convert the user's formula to a list, which turns out to
> be, for example: '(lambda (x) (+ x 13)) and compile it and save it in a
> formula table:
>
> (hash-set! my-cell-formulae some-cell-ref (compile '(lambda (x) (+ x 13))))
>
> So I can I expect a speed-up by having done the compile, as opposed to
> an eval?
>
> I assume the answer is "yes", but I wanted to check.
We can try this out:
scheme@(guile-user)> (use-modules (system base compile))
scheme@(guile-user)> (define exp '(lambda (n)
(let loop ([i n] [total 0])
(if (= i 0)
total
(loop (1- i) (+ i total))))))
scheme@(guile-user)> (define f1 (eval exp (interaction-environment)))
scheme@(guile-user)> (define f2 (compile exp #:env
(interaction-environment)))
scheme@(guile-user)> ,time (f1 1000000)
$2 = 500000500000
;; 0.845240s real time, 0.895351s run time. 0.071494s spent in GC.
scheme@(guile-user)> ,time (f2 1000000)
$3 = 500000500000
;; 0.067317s real time, 0.067278s run time. 0.000000s spent in GC.
So the answer does seem to be "yes": the compiled procedure is much faster.
--
Vítor De Araújo
https://elmord.org/
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Is this a good use for "compile"
2018-02-20 0:08 ` Vítor De Araújo
@ 2018-02-20 9:28 ` Mark Carter
0 siblings, 0 replies; 5+ messages in thread
From: Mark Carter @ 2018-02-20 9:28 UTC (permalink / raw)
To: guile-user
On 20/02/18 00:08, Vítor De Araújo wrote:
>
> We can try this out:
>
> scheme@(guile-user)> (use-modules (system base compile))
> scheme@(guile-user)> (define exp '(lambda (n)
> (let loop ([i n] [total 0])
> (if (= i 0)
> total
> (loop (1- i) (+ i total))))))
> scheme@(guile-user)> (define f1 (eval exp (interaction-environment)))
> scheme@(guile-user)> (define f2 (compile exp #:env
> (interaction-environment)))
> scheme@(guile-user)> ,time (f1 1000000)
> $2 = 500000500000
> ;; 0.845240s real time, 0.895351s run time. 0.071494s spent in GC.
> scheme@(guile-user)> ,time (f2 1000000)
> $3 = 500000500000
> ;; 0.067317s real time, 0.067278s run time. 0.000000s spent in GC.
>
> So the answer does seem to be "yes": the compiled procedure is much
> faster.
>
Thanks. A 10X speedup is just what the doctor ordered.
As it happened, I was looking for a way to time functions, and didn't
realise that guile has a convenient way of doing this.
^ permalink raw reply [flat|nested] 5+ messages in thread
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