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ff4d367275
According to the new benchmarks, this leads a 5% speed improvement when
reading small strings, and a 27% improvement when reading large strings.
* libguile/read.c (READER_STRING_BUFFER_SIZE): Change to 128; update
comment to mention codepoints.
(scm_read_string): Make `str' a list of strings, instead of a string.
Store characters read in buffer `c_str'. Cons to STR when C_STR is
full, and concatenate/reverse at the end.
* benchmark-suite/benchmarks/read.bm (small, large): New variables.
Set %DEFAULT-PORT-ENCODING to "UTF-8".
("read")["small strings", "large strings"]: New benchmarks.
73 lines
2.3 KiB
Scheme
73 lines
2.3 KiB
Scheme
;;; read.bm --- Exercise the reader. -*- Scheme -*-
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;;;
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;;; Copyright (C) 2008, 2010, 2012 Free Software Foundation, Inc.
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;;;
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;;; This program is free software; you can redistribute it and/or
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;;; modify it under the terms of the GNU Lesser General Public License
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;;; as published by the Free Software Foundation; either version 3, or
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;;; (at your option) any later version.
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;;;
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;;; This program is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU Lesser General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU Lesser General Public
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;;; License along with this software; see the file COPYING.LESSER. If
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;;; not, write to the Free Software Foundation, Inc., 51 Franklin
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;;; Street, Fifth Floor, Boston, MA 02110-1301 USA
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(define-module (benchmarks read)
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:use-module (benchmark-suite lib))
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(define %files-to-load
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;; Various large Scheme files.
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(map %search-load-path
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'("ice-9/boot-9.scm" "ice-9/common-list.scm"
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"ice-9/format.scm" "ice-9/optargs.scm"
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"ice-9/session.scm" "ice-9/getopt-long.scm"
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"ice-9/psyntax-pp.scm")))
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(define (load-file-with-reader file-name reader buffering)
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(with-input-from-file file-name
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(lambda ()
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(apply setvbuf (current-input-port) buffering)
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(let loop ((sexp (reader)))
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(if (eof-object? sexp)
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#t
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(loop (reader)))))))
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(define (exercise-read buffering)
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(for-each (lambda (file)
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(load-file-with-reader file read buffering))
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%files-to-load))
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(define small "\"hello, world!\"")
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(define large (string-append "\"" (make-string 1234 #\A) "\""))
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(fluid-set! %default-port-encoding "UTF-8") ; for string ports
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(with-benchmark-prefix "read"
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(benchmark "_IONBF" 5 ;; this one is very slow
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(exercise-read (list _IONBF)))
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(benchmark "_IOLBF" 10
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(exercise-read (list _IOLBF)))
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(benchmark "_IOFBF 4096" 10
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(exercise-read (list _IOFBF 4096)))
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(benchmark "_IOFBF 8192" 10
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(exercise-read (list _IOFBF 8192)))
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(benchmark "_IOFBF 16384" 10
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(exercise-read (list _IOFBF 16384)))
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(benchmark "small strings" 100000
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(call-with-input-string small read))
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(benchmark "large strings" 100000
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(call-with-input-string large read)))
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