Re: Read-sequence is slow?

Raymond Toy <[email protected]> Sat, 11 Apr 2026 18:18:18 -0700
Newsgroups	gmane.lisp.gcl.devel
Message-ID	<[email protected]>
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On 4/8/26 9:21 AM, Raymond Toy wrote:

> I have this routine:
>
> |(defun slurp-bytes (filename) "Return the entire contents of FILENAME 
> as a (unsigned-byte 8) vector. Results are cached in *bytes-cache* so 
> each file is read only once." (or (gethash filename *bytes-cache*) 
> (setf (gethash filename *bytes-cache*) (with-open-file (s filename 
> :direction :input :element-type '(unsigned-byte 8)) (let* ((len 
> (file-length s)) (buf (make-array len :element-type '(unsigned-byte 
> 8)))) (read-sequence buf s) buf))))) |
>
> When reading maxima.info-1 (1030671 bytes), it takes a very long time 
> (several seconds). Is there anyway to speed this up? I would have 
> expected reading a bunch of bytes from a file via read-sequence would 
> be very fast.
>
Some googling pointed me to |si:fread|. It makes |slurp-bytes| really 
fast taking tiny fractions of a sec to read i a 1 MB file. Having 
|read-sequence| use |si:fread| for element types of |character| or 
|(unsigned-byte 8)| would be a really good thing.

&#8203;
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<!DOCTYPE html>
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    <meta http-equiv=3D"content-type" content=3D"text/html; charset=3DUTF=
-8">
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    <div class=3D"markdown-here-wrapper">
      <p style=3D"margin-bottom: 19.2px; margin-top: 0px;">On 4/8/26 9:21=

        AM, Raymond Toy wrote:<br>
      </p>
      <blockquote type=3D"cite"
style=3D"border-block-color: rgb(119, 119, 119); border-bottom-color: rgb=
(119, 119, 119); border-inline-color: rgb(114, 159, 207) rgb(119, 119, 11=
9); border-inline-start: 2px solid rgb(114, 159, 207); border-left: 2px s=
olid rgb(114, 159, 207); border-right-color: rgb(119, 119, 119); border-t=
op-color: rgb(119, 119, 119); color: rgb(119, 119, 119); column-rule-colo=
r: rgb(119, 119, 119); margin: 19.2px 0px; outline-color: rgb(119, 119, 1=
19); padding-inline: 16px; padding-left: 16px; padding-right: 16px; quote=
s: none; text-decoration-color: rgb(119, 119, 119); text-emphasis-color: =
rgb(119, 119, 119);">
        <title></title>
        <div class=3D"markdown-here-wrapper">
          <p style=3D"margin-bottom: 19.2px; margin-top: 0px;">I have thi=
s
            routine:</p>
          <pre
style=3D"font-family: Consolas, Inconsolata, Courier, monospace; font-siz=
e: 16px; line-height: 19.2px; margin-bottom: 19.2px; margin-top: 19.2px;"=
><code
style=3D"background-color: rgba(175, 184, 193, 0.2); border-block: 1px so=
lid rgb(204, 204, 204); border-bottom: 1px solid rgb(204, 204, 204); bord=
er-bottom-left-radius: 3px; border-bottom-right-radius: 3px; border-end-e=
nd-radius: 3px; border-end-start-radius: 3px; border-inline: 1px solid rg=
b(204, 204, 204); border-left: 1px solid rgb(204, 204, 204); border-right=
: 1px solid rgb(204, 204, 204); border-start-end-radius: 3px; border-star=
t-start-radius: 3px; border-top: 1px solid rgb(204, 204, 204); border-top=
-left-radius: 3px; border-top-right-radius: 3px; display: block; font-fam=
ily: Consolas, Inconsolata, Courier, monospace; font-size: 16px; font-wei=
ght: 550; line-height: 19.2px; margin-left: 2.4px; margin-right: 2.4px; o=
verflow-block: auto; overflow-inline: auto; overflow: auto; padding-block=
: 8px; padding-bottom: 8px; padding-inline: 11.2px; padding-left: 11.2px;=
 padding-right: 11.2px; padding-top: 8px;">
(defun slurp-bytes (filename)
  "Return the entire contents of FILENAME as a (unsigned-byte 8) vector.
   Results are cached in *bytes-cache* so each file is read only once."
  (or (gethash filename *bytes-cache*)
      (setf (gethash filename *bytes-cache*)
            (with-open-file (s filename :direction :input
                                        :element-type '(unsigned-byte 8))=

              (let* ((len (file-length s))
                     (buf (make-array len :element-type '(unsigned-byte 8=
))))
                (read-sequence buf s)
                buf)))))
</code></pre>
          <p style=3D"margin-bottom: 19.2px; margin-top: 0px;">When
            reading maxima.info-1 (1030671 bytes), it takes a very long
            time (several seconds). Is there anyway to speed this up? I
            would have expected reading a bunch of bytes from a file via
            read-sequence would be very fast.</p>
        </div>
      </blockquote>
      <p style=3D"margin-bottom: 19.2px; margin-top: 0px;">Some googling
        pointed me to <code
style=3D"background-color: rgba(175, 184, 193, 0.2); border-bottom-left-r=
adius: 3px; border-bottom-right-radius: 3px; border-end-end-radius: 3px; =
border-end-start-radius: 3px; border-start-end-radius: 3px; border-start-=
start-radius: 3px; border-top-left-radius: 3px; border-top-right-radius: =
3px; font-family: Consolas, Inconsolata, Courier, monospace; font-size: 1=
6px; font-weight: 550; margin-left: 2.4px; margin-right: 2.4px; padding-i=
nline: 4.8px; padding-left: 4.8px; padding-right: 4.8px; white-space-coll=
apse: preserve;">si:fread</code>.
        It makes <code
style=3D"background-color: rgba(175, 184, 193, 0.2); border-bottom-left-r=
adius: 3px; border-bottom-right-radius: 3px; border-end-end-radius: 3px; =
border-end-start-radius: 3px; border-start-end-radius: 3px; border-start-=
start-radius: 3px; border-top-left-radius: 3px; border-top-right-radius: =
3px; font-family: Consolas, Inconsolata, Courier, monospace; font-size: 1=
6px; font-weight: 550; margin-left: 2.4px; margin-right: 2.4px; padding-i=
nline: 4.8px; padding-left: 4.8px; padding-right: 4.8px; white-space-coll=
apse: preserve;">slurp-bytes</code>
        really fast taking tiny fractions of a sec to read i a 1 MB
        file. Having <code
style=3D"background-color: rgba(175, 184, 193, 0.2); border-bottom-left-r=
adius: 3px; border-bottom-right-radius: 3px; border-end-end-radius: 3px; =
border-end-start-radius: 3px; border-start-end-radius: 3px; border-start-=
start-radius: 3px; border-top-left-radius: 3px; border-top-right-radius: =
3px; font-family: Consolas, Inconsolata, Courier, monospace; font-size: 1=
6px; font-weight: 550; margin-left: 2.4px; margin-right: 2.4px; padding-i=
nline: 4.8px; padding-left: 4.8px; padding-right: 4.8px; white-space-coll=
apse: preserve;">read-sequence</code>
        use <code
style=3D"background-color: rgba(175, 184, 193, 0.2); border-bottom-left-r=
adius: 3px; border-bottom-right-radius: 3px; border-end-end-radius: 3px; =
border-end-start-radius: 3px; border-start-end-radius: 3px; border-start-=
start-radius: 3px; border-top-left-radius: 3px; border-top-right-radius: =
3px; font-family: Consolas, Inconsolata, Courier, monospace; font-size: 1=
6px; font-weight: 550; margin-left: 2.4px; margin-right: 2.4px; padding-i=
nline: 4.8px; padding-left: 4.8px; padding-right: 4.8px; white-space-coll=
apse: preserve;">si:fread</code>
        for element types of <code
style=3D"background-color: rgba(175, 184, 193, 0.2); border-bottom-left-r=
adius: 3px; border-bottom-right-radius: 3px; border-end-end-radius: 3px; =
border-end-start-radius: 3px; border-start-end-radius: 3px; border-start-=
start-radius: 3px; border-top-left-radius: 3px; border-top-right-radius: =
3px; font-family: Consolas, Inconsolata, Courier, monospace; font-size: 1=
6px; font-weight: 550; margin-left: 2.4px; margin-right: 2.4px; padding-i=
nline: 4.8px; padding-left: 4.8px; padding-right: 4.8px; white-space-coll=
apse: preserve;">character</code>
        or <code
style=3D"background-color: rgba(175, 184, 193, 0.2); border-bottom-left-r=
adius: 3px; border-bottom-right-radius: 3px; border-end-end-radius: 3px; =
border-end-start-radius: 3px; border-start-end-radius: 3px; border-start-=
start-radius: 3px; border-top-left-radius: 3px; border-top-right-radius: =
3px; font-family: Consolas, Inconsolata, Courier, monospace; font-size: 1=
6px; font-weight: 550; margin-left: 2.4px; margin-right: 2.4px; padding-i=
nline: 4.8px; padding-left: 4.8px; padding-right: 4.8px; white-space-coll=
apse: preserve;">(unsigned-byte 8)</code>
        would be a really good thing.</p>
      <blockquote type=3D"cite"
style=3D"border-block-color: rgb(119, 119, 119); border-bottom-color: rgb=
(119, 119, 119); border-inline-color: rgb(114, 159, 207) rgb(119, 119, 11=
9); border-inline-start: 2px solid rgb(114, 159, 207); border-left: 2px s=
olid rgb(114, 159, 207); border-right-color: rgb(119, 119, 119); border-t=
op-color: rgb(119, 119, 119); color: rgb(119, 119, 119); column-rule-colo=
r: rgb(119, 119, 119); margin: 19.2px 0px; outline-color: rgb(119, 119, 1=
19); padding-inline: 16px; padding-left: 16px; padding-right: 16px; quote=
s: none; text-decoration-color: rgb(119, 119, 119); text-emphasis-color: =
rgb(119, 119, 119);">
        <div class=3D"markdown-here-wrapper"> </div>
      </blockquote>
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