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authorDan McGee <dan@archlinux.org>2011-02-04 09:10:25 -0600
committerDan McGee <dan@archlinux.org>2011-02-04 09:10:25 -0600
commite34fc4eddf73f2453b42235f5ae7d65f75db66fc (patch)
tree93b3a31a7db207f70b0a024f4de83ff8e0e3158f /lib/libalpm/be_sync.c
parentc12ccbfb2c7aa907ba01339a1a29089c65ea9911 (diff)
parent6b0d4674bb132b2583920211cc798f3db77ec392 (diff)
Merge remote-tracking branch 'allan/hash'
Diffstat (limited to 'lib/libalpm/be_sync.c')
-rw-r--r--lib/libalpm/be_sync.c77
1 files changed, 72 insertions, 5 deletions
diff --git a/lib/libalpm/be_sync.c b/lib/libalpm/be_sync.c
index f7101f54..4ad045c2 100644
--- a/lib/libalpm/be_sync.c
+++ b/lib/libalpm/be_sync.c
@@ -145,9 +145,67 @@ int SYMEXPORT alpm_db_update(int force, pmdb_t *db)
static int sync_db_read(pmdb_t *db, struct archive *archive,
struct archive_entry *entry, pmpkg_t *likely_pkg);
+/*
+ * This is the data table used to generate the estimating function below.
+ * "Weighted Avg" means averaging the bottom table values; thus each repo, big
+ * or small, will have equal influence. "Unweighted Avg" means averaging the
+ * sums of the top table columns, thus each package has equal influence. The
+ * final values are calculated by (surprise) averaging the averages, because
+ * why the hell not.
+ *
+ * Database Pkgs tar bz2 gz xz
+ * community 2096 5294080 256391 421227 301296
+ * core 180 460800 25257 36850 29356
+ * extra 2606 6635520 294647 470818 339392
+ * multilib 126 327680 16120 23261 18732
+ * testing 76 204800 10902 14348 12100
+ *
+ * Bytes Per Package
+ * community 2096 2525.80 122.32 200.97 143.75
+ * core 180 2560.00 140.32 204.72 163.09
+ * extra 2606 2546.25 113.06 180.67 130.23
+ * multilib 126 2600.63 127.94 184.61 148.67
+ * testing 76 2694.74 143.45 188.79 159.21
+
+ * Weighted Avg 2585.48 129.42 191.95 148.99
+ * Unweighted Avg 2543.39 118.74 190.16 137.93
+ * Average of Avgs 2564.44 124.08 191.06 143.46
+ */
+static int estimate_package_count(struct stat *st, struct archive *archive)
+{
+ unsigned int per_package;
+
+ switch(archive_compression(archive)) {
+ case ARCHIVE_COMPRESSION_NONE:
+ per_package = 2564;
+ break;
+ case ARCHIVE_COMPRESSION_GZIP:
+ per_package = 191;
+ break;
+ case ARCHIVE_COMPRESSION_BZIP2:
+ per_package = 124;
+ break;
+ case ARCHIVE_COMPRESSION_COMPRESS:
+ per_package = 193;
+ break;
+ case ARCHIVE_COMPRESSION_LZMA:
+ case ARCHIVE_COMPRESSION_XZ:
+ per_package = 143;
+ break;
+ case ARCHIVE_COMPRESSION_UU:
+ per_package = 3543;
+ break;
+ default:
+ /* assume it is at least somewhat compressed */
+ per_package = 200;
+ }
+ return((int)(st->st_size / per_package) + 1);
+}
+
static int sync_db_populate(pmdb_t *db)
{
- int count = 0;
+ int est_count, count = 0;
+ struct stat buf;
struct archive *archive;
struct archive_entry *entry;
pmpkg_t *pkg = NULL;
@@ -169,6 +227,13 @@ static int sync_db_populate(pmdb_t *db)
archive_read_finish(archive);
RET_ERR(PM_ERR_DB_OPEN, 1);
}
+ if(lstat(_alpm_db_path(db), &buf) != 0) {
+ RET_ERR(PM_ERR_DB_OPEN, 1);
+ }
+ est_count = estimate_package_count(&buf, archive);
+
+ /* initialize hash at 66% full */
+ db->pkgcache = _alpm_pkghash_create(est_count * 3 / 2);
while(archive_read_next_header(archive, &entry) == ARCHIVE_OK) {
const struct stat *st;
@@ -194,7 +259,7 @@ static int sync_db_populate(pmdb_t *db)
}
/* duplicated database entries are not allowed */
- if(_alpm_pkg_find(db->pkgcache, pkg->name)) {
+ if(_alpm_pkghash_find(db->pkgcache, pkg->name)) {
_alpm_log(PM_LOG_ERROR, _("duplicated database entry '%s'\n"), pkg->name);
_alpm_pkg_free(pkg);
continue;
@@ -207,7 +272,7 @@ static int sync_db_populate(pmdb_t *db)
/* add to the collection */
_alpm_log(PM_LOG_FUNCTION, "adding '%s' to package cache for db '%s'\n",
pkg->name, db->treename);
- db->pkgcache = alpm_list_add(db->pkgcache, pkg);
+ db->pkgcache = _alpm_pkghash_add(db->pkgcache, pkg);
count++;
} else {
/* we have desc, depends or deltas - parse it */
@@ -215,7 +280,9 @@ static int sync_db_populate(pmdb_t *db)
}
}
- db->pkgcache = alpm_list_msort(db->pkgcache, (size_t)count, _alpm_pkg_cmp);
+ if(count > 0) {
+ db->pkgcache->list = alpm_list_msort(db->pkgcache->list, (size_t)count, _alpm_pkg_cmp);
+ }
archive_read_finish(archive);
return(count);
@@ -281,7 +348,7 @@ static int sync_db_read(pmdb_t *db, struct archive *archive,
if(likely_pkg && strcmp(likely_pkg->name, pkgname) == 0) {
pkg = likely_pkg;
} else {
- pkg = _alpm_pkg_find(db->pkgcache, pkgname);
+ pkg = _alpm_pkghash_find(db->pkgcache, pkgname);
}
if(pkg == NULL) {
_alpm_log(PM_LOG_DEBUG, "package %s not found in %s sync database",