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Enhance db_bench to be able to specify a grandparent_overlap_factor.

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Summary:
The value specified in max_grandparent_overlap_factor is used to
limit the file size in a compaction run. This patch makes it
configurable when using db_bench.

Test Plan: make clean db_bench

Reviewers: MarkCallaghan, heyongqiang

Reviewed By: heyongqiang

CC: leveldb

Differential Revision: https://reviews.facebook.net/D6729
This commit is contained in:
Dhruba Borthakur 2012-11-14 09:10:46 -08:00
parent 0f590af623
commit e988c11f58
1 changed files with 9 additions and 0 deletions
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9
db/db_bench.cc
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@ -201,6 +201,10 @@ static int FLAGS_stats_per_interval = 0;
// less than or equal to this value.
static double FLAGS_rate_limit = 0;
// Control maximum bytes of overlaps in grandparent (i.e., level+2) before we
// stop building a single file in a level->level+1 compaction.
static int FLAGS_max_grandparent_overlap_factor;
// Run read only benchmarks.
static bool FLAGS_read_only = false;
@ -955,6 +959,8 @@ class Benchmark {
FLAGS_delete_obsolete_files_period_micros;
options.rate_limit = FLAGS_rate_limit;
options.table_cache_numshardbits = FLAGS_table_cache_numshardbits;
options.max_grandparent_overlap_factor =
FLAGS_max_grandparent_overlap_factor;
Status s;
if(FLAGS_read_only) {
s = DB::OpenForReadOnly(options, FLAGS_db, &db_);
@ -1395,6 +1401,9 @@ int main(int argc, char** argv) {
} else if (sscanf(argv[i], "--readonly=%d%c", &n, &junk) == 1 &&
(n == 0 || n ==1 )) {
FLAGS_read_only = n;
} else if (sscanf(argv[i], "--max_grandparent_overlap_factor=%d%c",
&n, &junk) == 1) {
FLAGS_max_grandparent_overlap_factor = n;
} else {
fprintf(stderr, "Invalid flag '%s'\n", argv[i]);
exit(1);