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d079837eee
In some repository configurations the user may have many packfiles,
but all of the recent commits/trees/tags/blobs are likely to
be in the most recent packfile (the one with the newest mtime).
It is therefore common to be able to complete an entire operation
by accessing only one packfile, even if there are 25 packfiles
available to the repository.
Rather than opening and mmaping the corresponding .idx file for
every pack found, we now only open and map the .idx when we suspect
there might be an object of interest in there.
Of course we cannot known in advance which packfile contains an
object, so we still need to scan the entire packed_git list to
locate anything. But odds are users want to access objects in the
most recently created packfiles first, and that may be all they
ever need for the current operation.
Junio observed in b867092f that placing recent packfiles before
older ones can slightly improve access times for recent objects,
without degrading it for historical object access.
This change improves upon Junio's observations by trying even harder
to avoid the .idx files that we won't need.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
/*
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* Builtin "git count-objects".
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*
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* Copyright (c) 2006 Junio C Hamano
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*/
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#include "cache.h"
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#include "builtin.h"
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static const char count_objects_usage[] = "git-count-objects [-v]";
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static void count_objects(DIR *d, char *path, int len, int verbose,
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unsigned long *loose,
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unsigned long *loose_size,
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unsigned long *packed_loose,
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unsigned long *garbage)
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{
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struct dirent *ent;
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while ((ent = readdir(d)) != NULL) {
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char hex[41];
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unsigned char sha1[20];
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const char *cp;
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int bad = 0;
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if ((ent->d_name[0] == '.') &&
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(ent->d_name[1] == 0 ||
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((ent->d_name[1] == '.') && (ent->d_name[2] == 0))))
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continue;
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for (cp = ent->d_name; *cp; cp++) {
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int ch = *cp;
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if (('0' <= ch && ch <= '9') ||
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('a' <= ch && ch <= 'f'))
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continue;
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bad = 1;
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break;
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}
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if (cp - ent->d_name != 38)
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bad = 1;
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else {
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struct stat st;
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memcpy(path + len + 3, ent->d_name, 38);
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path[len + 2] = '/';
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path[len + 41] = 0;
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if (lstat(path, &st) || !S_ISREG(st.st_mode))
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bad = 1;
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else
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(*loose_size) += xsize_t(st.st_blocks);
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}
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if (bad) {
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if (verbose) {
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error("garbage found: %.*s/%s",
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len + 2, path, ent->d_name);
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(*garbage)++;
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}
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continue;
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}
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(*loose)++;
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if (!verbose)
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continue;
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memcpy(hex, path+len, 2);
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memcpy(hex+2, ent->d_name, 38);
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hex[40] = 0;
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if (get_sha1_hex(hex, sha1))
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die("internal error");
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if (has_sha1_pack(sha1, NULL))
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(*packed_loose)++;
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}
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}
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int cmd_count_objects(int ac, const char **av, const char *prefix)
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{
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int i;
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int verbose = 0;
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const char *objdir = get_object_directory();
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int len = strlen(objdir);
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char *path = xmalloc(len + 50);
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unsigned long loose = 0, packed = 0, packed_loose = 0, garbage = 0;
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unsigned long loose_size = 0;
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for (i = 1; i < ac; i++) {
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const char *arg = av[i];
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if (*arg != '-')
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break;
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else if (!strcmp(arg, "-v"))
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verbose = 1;
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else
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usage(count_objects_usage);
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}
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/* we do not take arguments other than flags for now */
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if (i < ac)
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usage(count_objects_usage);
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memcpy(path, objdir, len);
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if (len && objdir[len-1] != '/')
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path[len++] = '/';
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for (i = 0; i < 256; i++) {
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DIR *d;
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sprintf(path + len, "%02x", i);
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d = opendir(path);
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if (!d)
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continue;
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count_objects(d, path, len, verbose,
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&loose, &loose_size, &packed_loose, &garbage);
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closedir(d);
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}
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if (verbose) {
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struct packed_git *p;
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unsigned long num_pack = 0;
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if (!packed_git)
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prepare_packed_git();
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for (p = packed_git; p; p = p->next) {
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if (!p->pack_local)
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continue;
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if (!p->index_data && open_pack_index(p))
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continue;
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packed += p->num_objects;
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num_pack++;
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}
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printf("count: %lu\n", loose);
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printf("size: %lu\n", loose_size / 2);
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printf("in-pack: %lu\n", packed);
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printf("packs: %lu\n", num_pack);
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printf("prune-packable: %lu\n", packed_loose);
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printf("garbage: %lu\n", garbage);
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}
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else
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printf("%lu objects, %lu kilobytes\n",
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loose, loose_size / 2);
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return 0;
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}
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