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adding notes about benchmarks for string-ref approaches

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Alex Shinn 2020-07-29 12:28:40 +09:00
parent c726273c3b
commit 36f188d274
1 changed files with 13 additions and 1 deletions
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14
include/chibi/features.h
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@ -216,7 +216,19 @@
/* You can configure with SEXP_STRING_INDEX_TABLE_CHUNK_SIZE below, */ /* You can configure with SEXP_STRING_INDEX_TABLE_CHUNK_SIZE below, */
/* the default is caching every 64th index (<=12.5% string overhead). */ /* the default is caching every 64th index (<=12.5% string overhead). */
/* With a minimum of 1 you'd have up to 8x string overhead, and */ /* With a minimum of 1 you'd have up to 8x string overhead, and */
/* string-ref would still be slightly slower than string-cursors. */ /* string-ref would still be slightly slower than string-cursors, */
/* and string-append would be marginally slower as well. */
/* */
/* In practice, the overhead of iterating over a string with */
/* string-ref isn't noticeable until about 10k chars. Times */
/* for iteration using the different approaches: */
/* */
/* impl\len 1000 10000 100000 1000000 */
/* string-ref (utf8) 1 97 9622 x */
/* string-ref (fast) 0 2 19 216 */
/* cursor-ref (srfi 130) 0 4 18 150 */
/* text-ref (srfi 135) 2 27 211 2006 */
/* */
/* #define SEXP_USE_STRING_INDEX_TABLE 1 */ /* #define SEXP_USE_STRING_INDEX_TABLE 1 */
/* uncomment this to disable automatic closing of ports */ /* uncomment this to disable automatic closing of ports */