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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2019-09-03 10:23:38 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2019-09-03 10:23:38 +0000 |
commit | 574098461cd45be12a497afbdac6f93c58978387 (patch) | |
tree | 9eb60a5930b7c20d42f7fde1e234cae3968ed3d9 /tests/profile/benchmark-procfile-parser.c | |
parent | Adding upstream version 1.16.1. (diff) | |
download | netdata-574098461cd45be12a497afbdac6f93c58978387.tar.xz netdata-574098461cd45be12a497afbdac6f93c58978387.zip |
Adding upstream version 1.17.0.upstream/1.17.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | tests/profile/benchmark-procfile-parser.c | 329 |
1 files changed, 0 insertions, 329 deletions
diff --git a/tests/profile/benchmark-procfile-parser.c b/tests/profile/benchmark-procfile-parser.c deleted file mode 100644 index 991e2dfc8..000000000 --- a/tests/profile/benchmark-procfile-parser.c +++ /dev/null @@ -1,329 +0,0 @@ -/* SPDX-License-Identifier: GPL-3.0-or-later */ - -#include "config.h" -#include "libnetdata/libnetdata.h" - -void netdata_cleanup_and_exit(int ret) { - exit(ret); -} - -#define PF_PREFIX "PROCFILE" -#define PFWORDS_INCREASE_STEP 200 -#define PFLINES_INCREASE_STEP 10 -#define PROCFILE_INCREMENT_BUFFER 512 -extern size_t procfile_max_lines; -extern size_t procfile_max_words; -extern size_t procfile_max_allocation; - - -static inline void pflines_reset(pflines *fl) { - // debug(D_PROCFILE, PF_PREFIX ": reseting lines"); - - fl->len = 0; -} - -static inline void pflines_free(pflines *fl) { - // debug(D_PROCFILE, PF_PREFIX ": freeing lines"); - - freez(fl); -} - -static inline void pfwords_reset(pfwords *fw) { - // debug(D_PROCFILE, PF_PREFIX ": reseting words"); - fw->len = 0; -} - - -static inline void pfwords_add(procfile *ff, char *str) { - // debug(D_PROCFILE, PF_PREFIX ": adding word No %d: '%s'", fw->len, str); - - pfwords *fw = ff->words; - if(unlikely(fw->len == fw->size)) { - // debug(D_PROCFILE, PF_PREFIX ": expanding words"); - - ff->words = fw = reallocz(fw, sizeof(pfwords) + (fw->size + PFWORDS_INCREASE_STEP) * sizeof(char *)); - fw->size += PFWORDS_INCREASE_STEP; - } - - fw->words[fw->len++] = str; -} - -NEVERNULL -static inline size_t *pflines_add(procfile *ff) { - // debug(D_PROCFILE, PF_PREFIX ": adding line %d at word %d", fl->len, first_word); - - pflines *fl = ff->lines; - if(unlikely(fl->len == fl->size)) { - // debug(D_PROCFILE, PF_PREFIX ": expanding lines"); - - ff->lines = fl = reallocz(fl, sizeof(pflines) + (fl->size + PFLINES_INCREASE_STEP) * sizeof(ffline)); - fl->size += PFLINES_INCREASE_STEP; - } - - ffline *ffl = &fl->lines[fl->len++]; - ffl->words = 0; - ffl->first = ff->words->len; - - return &ffl->words; -} - - -NOINLINE -static void procfile_parser(procfile *ff) { - // debug(D_PROCFILE, PF_PREFIX ": Parsing file '%s'", ff->filename); - - char *s = ff->data // our current position - , *e = &ff->data[ff->len] // the terminating null - , *t = ff->data; // the first character of a word (or quoted / parenthesized string) - - // the look up array to find our type of character - PF_CHAR_TYPE *separators = ff->separators; - - char quote = 0; // the quote character - only when in quoted string - size_t opened = 0; // counts the number of open parenthesis - - size_t *line_words = pflines_add(ff); - - while(s < e) { - PF_CHAR_TYPE ct = separators[(unsigned char)(*s)]; - - // this is faster than a switch() - // read more here: http://lazarenko.me/switch/ - switch(ct) { - case PF_CHAR_IS_SEPARATOR: - if(!quote && !opened) { - if (s != t) { - // separator, but we have word before it - *s = '\0'; - pfwords_add(ff, t); - (*line_words)++; - } - t = s + 1; - } - // fallthrough - - case PF_CHAR_IS_WORD: - s++; - break; - - - case PF_CHAR_IS_NEWLINE: - // end of line - - *s = '\0'; - pfwords_add(ff, t); - (*line_words)++; - t = ++s; - - // debug(D_PROCFILE, PF_PREFIX ": ended line %d with %d words", l, ff->lines->lines[l].words); - - line_words = pflines_add(ff); - break; - - case PF_CHAR_IS_QUOTE: - if(unlikely(!quote && s == t)) { - // quote opened at the beginning - quote = *s; - t = ++s; - } - else if(unlikely(quote && quote == *s)) { - // quote closed - quote = 0; - - *s = '\0'; - pfwords_add(ff, t); - (*line_words)++; - t = ++s; - } - else - s++; - break; - - case PF_CHAR_IS_OPEN: - if(s == t) { - opened++; - t = ++s; - } - else if(opened) { - opened++; - s++; - } - else - s++; - break; - - case PF_CHAR_IS_CLOSE: - if(opened) { - opened--; - - if(!opened) { - *s = '\0'; - pfwords_add(ff, t); - (*line_words)++; - t = ++s; - } - else - s++; - } - else - s++; - break; - - default: - fatal("Internal Error: procfile_readall() does not handle all the cases."); - } - } - - if(likely(s > t && t < e)) { - // the last word - if(unlikely(ff->len >= ff->size)) { - // we are going to loose the last byte - s = &ff->data[ff->size - 1]; - } - - *s = '\0'; - pfwords_add(ff, t); - (*line_words)++; - // t = ++s; - } -} - - -procfile *procfile_readall1(procfile *ff) { - // debug(D_PROCFILE, PF_PREFIX ": Reading file '%s'.", ff->filename); - - ff->len = 0; // zero the used size - ssize_t r = 1; // read at least once - while(r > 0) { - ssize_t s = ff->len; - ssize_t x = ff->size - s; - - if(unlikely(!x)) { - debug(D_PROCFILE, PF_PREFIX ": Expanding data buffer for file '%s'.", procfile_filename(ff)); - ff = reallocz(ff, sizeof(procfile) + ff->size + PROCFILE_INCREMENT_BUFFER); - ff->size += PROCFILE_INCREMENT_BUFFER; - } - - debug(D_PROCFILE, "Reading file '%s', from position %zd with length %zd", procfile_filename(ff), s, (ssize_t)(ff->size - s)); - r = read(ff->fd, &ff->data[s], ff->size - s); - if(unlikely(r == -1)) { - if(unlikely(!(ff->flags & PROCFILE_FLAG_NO_ERROR_ON_FILE_IO))) error(PF_PREFIX ": Cannot read from file '%s' on fd %d", procfile_filename(ff), ff->fd); - procfile_close(ff); - return NULL; - } - - ff->len += r; - } - - // debug(D_PROCFILE, "Rewinding file '%s'", ff->filename); - if(unlikely(lseek(ff->fd, 0, SEEK_SET) == -1)) { - if(unlikely(!(ff->flags & PROCFILE_FLAG_NO_ERROR_ON_FILE_IO))) error(PF_PREFIX ": Cannot rewind on file '%s'.", procfile_filename(ff)); - procfile_close(ff); - return NULL; - } - - pflines_reset(ff->lines); - pfwords_reset(ff->words); - procfile_parser(ff); - - if(unlikely(procfile_adaptive_initial_allocation)) { - if(unlikely(ff->len > procfile_max_allocation)) procfile_max_allocation = ff->len; - if(unlikely(ff->lines->len > procfile_max_lines)) procfile_max_lines = ff->lines->len; - if(unlikely(ff->words->len > procfile_max_words)) procfile_max_words = ff->words->len; - } - - // debug(D_PROCFILE, "File '%s' updated.", ff->filename); - return ff; -} - - - - - - - - -// ============== -// --- Poor man cycle counting. -static unsigned long tsc; - -void begin_tsc(void) -{ - unsigned long a, d; - asm volatile ("cpuid\nrdtsc" : "=a" (a), "=d" (d) : "0" (0) : "ebx", "ecx"); - tsc = ((unsigned long)d << 32) | (unsigned long)a; -} - -unsigned long end_tsc(void) -{ - unsigned long a, d; - asm volatile ("rdtscp" : "=a" (a), "=d" (d) : : "ecx"); - return (((unsigned long)d << 32) | (unsigned long)a) - tsc; -} -// ============== - - -unsigned long test_netdata_internal(void) { - static procfile *ff = NULL; - - ff = procfile_reopen(ff, "/proc/self/status", " \t:,-()/", PROCFILE_FLAG_NO_ERROR_ON_FILE_IO); - if(!ff) { - fprintf(stderr, "Failed to open filename\n"); - exit(1); - } - - begin_tsc(); - ff = procfile_readall(ff); - unsigned long c = end_tsc(); - - if(!ff) { - fprintf(stderr, "Failed to read filename\n"); - exit(1); - } - - return c; -} - -unsigned long test_method1(void) { - static procfile *ff = NULL; - - ff = procfile_reopen(ff, "/proc/self/status", " \t:,-()/", PROCFILE_FLAG_NO_ERROR_ON_FILE_IO); - if(!ff) { - fprintf(stderr, "Failed to open filename\n"); - exit(1); - } - - begin_tsc(); - ff = procfile_readall1(ff); - unsigned long c = end_tsc(); - - if(!ff) { - fprintf(stderr, "Failed to read filename\n"); - exit(1); - } - - return c; -} - -//--- Test -int main(int argc, char **argv) -{ - (void)argc; (void)argv; - - int i, max = 1000000; - - unsigned long c1 = 0; - test_netdata_internal(); - for(i = 0; i < max ; i++) - c1 += test_netdata_internal(); - - unsigned long c2 = 0; - test_method1(); - for(i = 0; i < max ; i++) - c2 += test_method1(); - - printf("netdata internal: completed in %lu cycles, %lu cycles per read, %0.2f %%.\n", c1, c1 / max, (float)c1 * 100.0 / (float)c1); - printf("method1 : completed in %lu cycles, %lu cycles per read, %0.2f %%.\n", c2, c2 / max, (float)c2 * 100.0 / (float)c1); - - return 0; -} |