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| author | Dan McGee <dan@archlinux.org> | 2012-01-07 18:25:04 +0100 |
|---|---|---|
| committer | Dan McGee <dan@archlinux.org> | 2012-01-07 18:28:37 +0100 |
| commit | 2d794cc031b634c55c77ec17b2b7864f7150ab34 (patch) | |
| tree | 649fd32bac9dc93624dd5d64b7c7e148f77c8a74 /lib/libalpm/be_sync.c | |
| parent | b7ecff160ee541904e7b75c9ba88a455c9502409 (diff) | |
| download | pacman-2d794cc031b634c55c77ec17b2b7864f7150ab34.tar.gz pacman-2d794cc031b634c55c77ec17b2b7864f7150ab34.tar.xz | |
Update sync database size estimation values
As the comment states, this is more like a dartboard than science.
Signed-off-by: Dan McGee <dan@archlinux.org>
Diffstat (limited to 'lib/libalpm/be_sync.c')
| -rw-r--r-- | lib/libalpm/be_sync.c | 49 |
1 files changed, 13 insertions, 36 deletions
diff --git a/lib/libalpm/be_sync.c b/lib/libalpm/be_sync.c index 76c31f5a..b16271bc 100644 --- a/lib/libalpm/be_sync.c +++ b/lib/libalpm/be_sync.c @@ -351,61 +351,38 @@ static alpm_pkg_t *load_pkg_for_entry(alpm_db_t *db, const char *entryname, return 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 - */ +/* This function doesn't work as well as one might think, as size of database + * entries varies considerably. Adding signatures nearly doubles the size of a + * single entry; deltas also can make for large variations in size. These + * current values are heavily influenced by Arch Linux; databases with no + * deltas and a single signature per package. */ static size_t estimate_package_count(struct stat *st, struct archive *archive) { - unsigned int per_package; + int per_package; switch(archive_compression(archive)) { case ARCHIVE_COMPRESSION_NONE: - per_package = 2564; + per_package = 3015; break; case ARCHIVE_COMPRESSION_GZIP: - per_package = 191; + case ARCHIVE_COMPRESSION_COMPRESS: + per_package = 464; break; case ARCHIVE_COMPRESSION_BZIP2: - per_package = 124; - break; - case ARCHIVE_COMPRESSION_COMPRESS: - per_package = 193; + per_package = 394; break; case ARCHIVE_COMPRESSION_LZMA: case ARCHIVE_COMPRESSION_XZ: - per_package = 143; + per_package = 400; break; #ifdef ARCHIVE_COMPRESSION_UU case ARCHIVE_COMPRESSION_UU: - per_package = 3543; + per_package = 3015 * 4 / 3; break; #endif default: /* assume it is at least somewhat compressed */ - per_package = 200; + per_package = 500; } return (size_t)((st->st_size / per_package) + 1); } |