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authorDaniel Baumann <daniel.baumann@progress-linux.org>2019-09-13 05:05:16 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2019-09-13 05:05:16 +0000
commit8f5d8f3de6cae180af37917ef978a4affc2cd464 (patch)
tree4bfe1abc6d19c2dd635d1b83cc0e73d0aa6904ac /tests/profile/benchmark-procfile-parser.c
parentAdding upstream version 1.17.0. (diff)
downloadnetdata-8f5d8f3de6cae180af37917ef978a4affc2cd464.tar.xz
netdata-8f5d8f3de6cae180af37917ef978a4affc2cd464.zip
Adding upstream version 1.17.1.upstream/1.17.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/profile/benchmark-procfile-parser.c')
-rw-r--r--tests/profile/benchmark-procfile-parser.c329
1 files changed, 329 insertions, 0 deletions
diff --git a/tests/profile/benchmark-procfile-parser.c b/tests/profile/benchmark-procfile-parser.c
new file mode 100644
index 000000000..991e2dfc8
--- /dev/null
+++ b/tests/profile/benchmark-procfile-parser.c
@@ -0,0 +1,329 @@
+/* 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;
+}