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Update sync database size estimation values

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As the comment states, this is more like a dartboard than science.

Signed-off-by: Dan McGee <dan@archlinux.org>
This commit is contained in:
Dan McGee 2012-01-07 11:25:04 -06:00
parent b7ecff160e
commit 2d794cc031
1 changed files with 13 additions and 36 deletions
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49
lib/libalpm/be_sync.c
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@ -351,61 +351,38 @@ static alpm_pkg_t *load_pkg_for_entry(alpm_db_t *db, const char *entryname,
return pkg; return pkg;
} }
/* /* This function doesn't work as well as one might think, as size of database
* This is the data table used to generate the estimating function below. * entries varies considerably. Adding signatures nearly doubles the size of a
* "Weighted Avg" means averaging the bottom table values; thus each repo, big * single entry; deltas also can make for large variations in size. These
* or small, will have equal influence. "Unweighted Avg" means averaging the * current values are heavily influenced by Arch Linux; databases with no
* sums of the top table columns, thus each package has equal influence. The * deltas and a single signature per package. */
* 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 size_t estimate_package_count(struct stat *st, struct archive *archive) static size_t estimate_package_count(struct stat *st, struct archive *archive)
{ {
unsigned int per_package; int per_package;
switch(archive_compression(archive)) { switch(archive_compression(archive)) {
case ARCHIVE_COMPRESSION_NONE: case ARCHIVE_COMPRESSION_NONE:
per_package = 2564; per_package = 3015;
break; break;
case ARCHIVE_COMPRESSION_GZIP: case ARCHIVE_COMPRESSION_GZIP:
per_package = 191; case ARCHIVE_COMPRESSION_COMPRESS:
per_package = 464;
break; break;
case ARCHIVE_COMPRESSION_BZIP2: case ARCHIVE_COMPRESSION_BZIP2:
per_package = 124; per_package = 394;
break;
case ARCHIVE_COMPRESSION_COMPRESS:
per_package = 193;
break; break;
case ARCHIVE_COMPRESSION_LZMA: case ARCHIVE_COMPRESSION_LZMA:
case ARCHIVE_COMPRESSION_XZ: case ARCHIVE_COMPRESSION_XZ:
per_package = 143; per_package = 400;
break; break;
#ifdef ARCHIVE_COMPRESSION_UU #ifdef ARCHIVE_COMPRESSION_UU
case ARCHIVE_COMPRESSION_UU: case ARCHIVE_COMPRESSION_UU:
per_package = 3543; per_package = 3015 * 4 / 3;
break; break;
#endif #endif
default: default:
/* assume it is at least somewhat compressed */ /* assume it is at least somewhat compressed */
per_package = 200; per_package = 500;
} }
return (size_t)((st->st_size / per_package) + 1); return (size_t)((st->st_size / per_package) + 1);
} }