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Use kwset in pickaxe 

Benchmarks in the hot cache case:

before:
$ perf stat --repeat=5 git log -Sqwerty

Performance counter stats for 'git log -Sqwerty' (5 runs):

       47,092,744 cache-misses             #      2.825 M/sec   ( +-   1.607% )
      123,368,389 cache-references         #      7.400 M/sec   ( +-   0.812% )
      330,040,998 branch-misses            #      3.134 %       ( +-   0.257% )
   10,530,896,750 branches                 #    631.663 M/sec   ( +-   0.121% )
   62,037,201,030 instructions             #      1.399 IPC     ( +-   0.142% )
   44,331,294,321 cycles                   #   2659.073 M/sec   ( +-   0.326% )
           96,794 page-faults              #      0.006 M/sec   ( +-  11.952% )
               25 CPU-migrations           #      0.000 M/sec   ( +-  25.266% )
            1,424 context-switches         #      0.000 M/sec   ( +-   0.540% )
     16671.708650 task-clock-msecs         #      0.997 CPUs    ( +-   0.343% )

      16.728692052  seconds time elapsed   ( +-   0.344% )

after:
$ perf stat --repeat=5 git log -Sqwerty

Performance counter stats for 'git log -Sqwerty' (5 runs):

       51,385,522 cache-misses             #      4.619 M/sec   ( +-   0.565% )
      129,177,880 cache-references         #     11.611 M/sec   ( +-   0.219% )
      319,222,775 branch-misses            #      6.946 %       ( +-   0.134% )
    4,595,913,233 branches                 #    413.086 M/sec   ( +-   0.112% )
   31,395,042,533 instructions             #      1.062 IPC     ( +-   0.129% )
   29,558,348,598 cycles                   #   2656.740 M/sec   ( +-   0.204% )
           93,224 page-faults              #      0.008 M/sec   ( +-   4.487% )
               19 CPU-migrations           #      0.000 M/sec   ( +-  10.425% )
              950 context-switches         #      0.000 M/sec   ( +-   0.360% )
     11125.796039 task-clock-msecs         #      0.997 CPUs    ( +-   0.239% )

      11.164216599  seconds time elapsed   ( +-   0.240% )

So the kwset code is about 33% faster.

Signed-off-by: Fredrik Kuivinen <frekui@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Fredrik Kuivinen 2011-08-21 00:41:57 +02:00 committed by Junio C Hamano
parent fca65d4b26
commit b95c5ada99
2 changed files with 25 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Makefile
View File

@ -533,6 +533,7 @@ LIB_H += graph.h
LIB_H += grep.h
LIB_H += hash.h
LIB_H += help.h
LIB_H += kwset.h
LIB_H += levenshtein.h
LIB_H += list-objects.h
LIB_H += ll-merge.h
@ -624,6 +625,7 @@ LIB_OBJS += hash.o
LIB_OBJS += help.o
LIB_OBJS += hex.o
LIB_OBJS += ident.o
LIB_OBJS += kwset.o
LIB_OBJS += levenshtein.o
LIB_OBJS += list-objects.o
LIB_OBJS += ll-merge.o

34
diffcore-pickaxe.c
View File

@ -6,6 +6,7 @@
#include "diff.h"
#include "diffcore.h"
#include "xdiff-interface.h"
#include "kwset.h"
struct diffgrep_cb {
regex_t *regexp;
@ -146,7 +147,7 @@ static void diffcore_pickaxe_grep(struct diff_options *o)
static unsigned int contains(struct diff_filespec *one,
const char *needle, unsigned long len,
regex_t *regexp)
regex_t *regexp, kwset_t kws)
{
unsigned int cnt;
unsigned long sz;
@ -175,9 +176,12 @@ static unsigned int contains(struct diff_filespec *one,
} else { /* Classic exact string match */
while (sz) {
const char *found = memmem(data, sz, needle, len);
if (!found)
size_t offset = kwsexec(kws, data, sz, NULL);
const char *found;
if (offset == -1)
break;
else
found = data + offset;
sz -= found - data + len;
data = found + len;
cnt++;
@ -195,6 +199,7 @@ static void diffcore_pickaxe_count(struct diff_options *o)
unsigned long len = strlen(needle);
int i, has_changes;
regex_t regex, *regexp = NULL;
kwset_t kws = NULL;
struct diff_queue_struct outq;
DIFF_QUEUE_CLEAR(&outq);
@ -209,6 +214,10 @@ static void diffcore_pickaxe_count(struct diff_options *o)
die("invalid pickaxe regex: %s", errbuf);
}
regexp = &regex;
} else {
kws = kwsalloc(NULL);
kwsincr(kws, needle, len);
kwsprep(kws);
}
if (opts & DIFF_PICKAXE_ALL) {
@ -219,16 +228,16 @@ static void diffcore_pickaxe_count(struct diff_options *o)
if (!DIFF_FILE_VALID(p->two))
continue; /* ignore unmerged */
/* created */
if (contains(p->two, needle, len, regexp))
if (contains(p->two, needle, len, regexp, kws))
has_changes++;
}
else if (!DIFF_FILE_VALID(p->two)) {
if (contains(p->one, needle, len, regexp))
if (contains(p->one, needle, len, regexp, kws))
has_changes++;
}
else if (!diff_unmodified_pair(p) &&
contains(p->one, needle, len, regexp) !=
contains(p->two, needle, len, regexp))
contains(p->one, needle, len, regexp, kws) !=
contains(p->two, needle, len, regexp, kws))
has_changes++;
}
if (has_changes)
@ -251,16 +260,17 @@ static void diffcore_pickaxe_count(struct diff_options *o)
if (!DIFF_FILE_VALID(p->two))
; /* ignore unmerged */
/* created */
else if (contains(p->two, needle, len, regexp))
else if (contains(p->two, needle, len, regexp,
kws))
has_changes = 1;
}
else if (!DIFF_FILE_VALID(p->two)) {
if (contains(p->one, needle, len, regexp))
if (contains(p->one, needle, len, regexp, kws))
has_changes = 1;
}
else if (!diff_unmodified_pair(p) &&
contains(p->one, needle, len, regexp) !=
contains(p->two, needle, len, regexp))
contains(p->one, needle, len, regexp, kws) !=
contains(p->two, needle, len, regexp, kws))
has_changes = 1;
if (has_changes)
@ -271,6 +281,8 @@ static void diffcore_pickaxe_count(struct diff_options *o)
if (opts & DIFF_PICKAXE_REGEX)
regfree(&regex);
else
kwsfree(kws);
free(q->queue);
*q = outq;