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From: Noah Goldstein <nwg@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] benchtests: Add more coverage for strcmp and strncmp benchmarks Date: Thu, 3 Feb 2022 23:30:36 +0000 (GMT) [thread overview] Message-ID: <20220203233036.07CE03858C39@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=80e6c6554bb3811d4b920e33cd7f4d4bdc85e855 commit 80e6c6554bb3811d4b920e33cd7f4d4bdc85e855 Author: Noah Goldstein <goldstein.w.n@gmail.com> Date: Mon Jan 10 15:35:40 2022 -0600 benchtests: Add more coverage for strcmp and strncmp benchmarks Add more small and medium sized tests for strcmp and strncmp. As well for strcmp add option for more direct control of alignment. Previously alignment was being pushed to the end of the page. While this is the most difficult case to implement, it is far from the common case and so shouldn't be the only benchmark. Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com> Diff: --- benchtests/bench-strcmp.c | 142 ++++++++++++++++++++++++++++++++------------- benchtests/bench-strncmp.c | 110 ++++++++++++++++++++++++++--------- 2 files changed, 183 insertions(+), 69 deletions(-) diff --git a/benchtests/bench-strcmp.c b/benchtests/bench-strcmp.c index 387e76fcfb..3a60edfb15 100644 --- a/benchtests/bench-strcmp.c +++ b/benchtests/bench-strcmp.c @@ -99,8 +99,8 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, } static void -do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, int - max_char, int exp_result) +do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, + int max_char, int exp_result, int at_end) { size_t i; @@ -109,19 +109,28 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, int if (len == 0) return; - align1 &= 63; + align1 &= ~(CHARBYTES - 1); + align2 &= ~(CHARBYTES - 1); + + align1 &= (getpagesize () - 1); if (align1 + (len + 1) * CHARBYTES >= page_size) return; - align2 &= 63; + align2 &= (getpagesize () - 1); if (align2 + (len + 1) * CHARBYTES >= page_size) return; /* Put them close to the end of page. */ - i = align1 + CHARBYTES * (len + 2); - s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1); - i = align2 + CHARBYTES * (len + 2); - s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16) + align2); + if (at_end) + { + i = align1 + CHARBYTES * (len + 2); + align1 = ((page_size - i) / 16 * 16) + align1; + i = align2 + CHARBYTES * (len + 2); + align2 = ((page_size - i) / 16 * 16) + align2; + } + + s1 = (CHAR *)(buf1 + align1); + s2 = (CHAR *)(buf2 + align2); for (i = 0; i < len; i++) s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; @@ -132,9 +141,9 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, int s2[len - 1] -= exp_result; json_element_object_begin (json_ctx); - json_attr_uint (json_ctx, "length", (double) len); - json_attr_uint (json_ctx, "align1", (double) align1); - json_attr_uint (json_ctx, "align2", (double) align2); + json_attr_uint (json_ctx, "length", (double)len); + json_attr_uint (json_ctx, "align1", (double)align1); + json_attr_uint (json_ctx, "align2", (double)align2); json_array_begin (json_ctx, "timings"); FOR_EACH_IMPL (impl, 0) @@ -202,7 +211,8 @@ int test_main (void) { json_ctx_t json_ctx; - size_t i; + size_t i, j, k; + size_t pg_sz = getpagesize (); test_init (); @@ -221,36 +231,88 @@ test_main (void) json_array_end (&json_ctx); json_array_begin (&json_ctx, "results"); - - for (i = 1; i < 32; ++i) - { - do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0); - do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1); - do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1); - } - - for (i = 1; i < 10 + CHARBYTESLOG; ++i) + for (k = 0; k < 2; ++k) { - do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 0); - do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 0); - do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 1); - do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 1); - do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, -1); - do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, -1); - do_test (&json_ctx, 0, CHARBYTES * i, 2 << i, MIDCHAR, 1); - do_test (&json_ctx, CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, LARGECHAR, 1); + for (i = 1; i < 32; ++i) + { + do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0, k); + do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1, k); + do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1, k); + } + + for (i = 1; i <= 8192;) + { + /* No page crosses. */ + do_test (&json_ctx, 0, 0, i, MIDCHAR, 0, k); + do_test (&json_ctx, i * CHARBYTES, 0, i, MIDCHAR, 0, k); + do_test (&json_ctx, 0, i * CHARBYTES, i, MIDCHAR, 0, k); + + /* False page crosses. */ + do_test (&json_ctx, pg_sz / 2, pg_sz / 2 - CHARBYTES, i, MIDCHAR, 0, + k); + do_test (&json_ctx, pg_sz / 2 - CHARBYTES, pg_sz / 2, i, MIDCHAR, 0, + k); + + do_test (&json_ctx, pg_sz - (i * CHARBYTES), 0, i, MIDCHAR, 0, k); + do_test (&json_ctx, 0, pg_sz - (i * CHARBYTES), i, MIDCHAR, 0, k); + + /* Real page cross. */ + for (j = 16; j < 128; j += 16) + { + do_test (&json_ctx, pg_sz - j, 0, i, MIDCHAR, 0, k); + do_test (&json_ctx, 0, pg_sz - j, i, MIDCHAR, 0, k); + + do_test (&json_ctx, pg_sz - j, pg_sz - j / 2, i, MIDCHAR, 0, k); + do_test (&json_ctx, pg_sz - j / 2, pg_sz - j, i, MIDCHAR, 0, k); + } + + if (i < 32) + { + ++i; + } + else if (i < 160) + { + i += 8; + } + else if (i < 512) + { + i += 32; + } + else + { + i *= 2; + } + } + + for (i = 1; i < 10 + CHARBYTESLOG; ++i) + { + do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 0, k); + do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 0, k); + do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 1, k); + do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 1, k); + do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, -1, k); + do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, -1, k); + do_test (&json_ctx, 0, CHARBYTES * i, 2 << i, MIDCHAR, 1, k); + do_test (&json_ctx, CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, + LARGECHAR, 1, k); + } + + for (i = 1; i < 8; ++i) + { + do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, + MIDCHAR, 0, k); + do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, + LARGECHAR, 0, k); + do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, + MIDCHAR, 1, k); + do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, + LARGECHAR, 1, k); + do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, + MIDCHAR, -1, k); + do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, + LARGECHAR, -1, k); + } } - - for (i = 1; i < 8; ++i) - { - do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 0); - do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 0); - do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 1); - do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 1); - do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, -1); - do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1); - } - do_test_page_boundary (&json_ctx); json_array_end (&json_ctx); diff --git a/benchtests/bench-strncmp.c b/benchtests/bench-strncmp.c index b7a01fde64..6673a53521 100644 --- a/benchtests/bench-strncmp.c +++ b/benchtests/bench-strncmp.c @@ -150,43 +150,43 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, size_t if (n == 0) return; - align1 &= 63; + align1 &= getpagesize () - 1; if (align1 + (n + 1) * CHARBYTES >= page_size) return; - align2 &= 7; + align2 &= getpagesize () - 1; if (align2 + (n + 1) * CHARBYTES >= page_size) return; json_element_object_begin (json_ctx); - json_attr_uint (json_ctx, "strlen", (double) len); - json_attr_uint (json_ctx, "len", (double) n); - json_attr_uint (json_ctx, "align1", (double) align1); - json_attr_uint (json_ctx, "align2", (double) align2); + json_attr_uint (json_ctx, "strlen", (double)len); + json_attr_uint (json_ctx, "len", (double)n); + json_attr_uint (json_ctx, "align1", (double)align1); + json_attr_uint (json_ctx, "align2", (double)align2); json_array_begin (json_ctx, "timings"); FOR_EACH_IMPL (impl, 0) - { - alloc_bufs (); - s1 = (CHAR *) (buf1 + align1); - s2 = (CHAR *) (buf2 + align2); - - for (i = 0; i < n; i++) - s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; - - s1[n] = 24 + exp_result; - s2[n] = 23; - s1[len] = 0; - s2[len] = 0; - if (exp_result < 0) - s2[len] = 32; - else if (exp_result > 0) - s1[len] = 64; - if (len >= n) - s2[n - 1] -= exp_result; + { + alloc_bufs (); + s1 = (CHAR *)(buf1 + align1); + s2 = (CHAR *)(buf2 + align2); + + for (i = 0; i < n; i++) + s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; + + s1[n] = 24 + exp_result; + s2[n] = 23; + s1[len] = 0; + s2[len] = 0; + if (exp_result < 0) + s2[len] = 32; + else if (exp_result > 0) + s1[len] = 64; + if (len >= n) + s2[n - 1] -= exp_result; - do_one_test (json_ctx, impl, s1, s2, n, exp_result); - } + do_one_test (json_ctx, impl, s1, s2, n, exp_result); + } json_array_end (json_ctx); json_element_object_end (json_ctx); @@ -319,7 +319,8 @@ int test_main (void) { json_ctx_t json_ctx; - size_t i; + size_t i, j, len; + size_t pg_sz = getpagesize (); test_init (); @@ -334,12 +335,12 @@ test_main (void) json_array_begin (&json_ctx, "ifuncs"); FOR_EACH_IMPL (impl, 0) - json_element_string (&json_ctx, impl->name); + json_element_string (&json_ctx, impl->name); json_array_end (&json_ctx); json_array_begin (&json_ctx, "results"); - for (i =0; i < 16; ++i) + for (i = 0; i < 16; ++i) { do_test (&json_ctx, 0, 0, 8, i, 127, 0); do_test (&json_ctx, 0, 0, 8, i, 127, -1); @@ -361,6 +362,57 @@ test_main (void) do_test (&json_ctx, i, 3 * i, 8, i, 255, -1); } + for (len = 0; len <= 128; len += 64) + { + for (i = 1; i <= 8192;) + { + /* No page crosses. */ + do_test (&json_ctx, 0, 0, i, i + len, 127, 0); + do_test (&json_ctx, i * CHARBYTES, 0, i, i + len, 127, 0); + do_test (&json_ctx, 0, i * CHARBYTES, i, i + len, 127, 0); + + /* False page crosses. */ + do_test (&json_ctx, pg_sz / 2, pg_sz / 2 - CHARBYTES, i, i + len, + 127, 0); + do_test (&json_ctx, pg_sz / 2 - CHARBYTES, pg_sz / 2, i, i + len, + 127, 0); + + do_test (&json_ctx, pg_sz - (i * CHARBYTES), 0, i, i + len, 127, + 0); + do_test (&json_ctx, 0, pg_sz - (i * CHARBYTES), i, i + len, 127, + 0); + + /* Real page cross. */ + for (j = 16; j < 128; j += 16) + { + do_test (&json_ctx, pg_sz - j, 0, i, i + len, 127, 0); + do_test (&json_ctx, 0, pg_sz - j, i, i + len, 127, 0); + + do_test (&json_ctx, pg_sz - j, pg_sz - j / 2, i, i + len, + 127, 0); + do_test (&json_ctx, pg_sz - j / 2, pg_sz - j, i, i + len, + 127, 0); + } + + if (i < 32) + { + ++i; + } + else if (i < 160) + { + i += 8; + } + else if (i < 256) + { + i += 32; + } + else + { + i *= 2; + } + } + } + for (i = 1; i < 8; ++i) { do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 127, 0);
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