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feat(server): introduce table_growth_margin flag (#2678)

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* feat(server): introduce table_growth_margin flag

Signed-off-by: adi_holden <adi@dragonflydb.io>
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adiholden 2024-03-03 15:02:18 +02:00 • committed by GitHub
parent 93debc754c
commit 7c443f3a15
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2 changed files with 8 additions and 2 deletions
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9
src/server/db_slice.cc
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@ -27,6 +27,10 @@ ABSL_FLAG(uint32_t, max_segment_to_consider, 4,
"The maximum number of dashtable segments to scan in each eviction "
"when heartbeat based eviction is triggered under memory pressure.");
ABSL_FLAG(double, table_growth_margin, 1.1,
"Prevents table from growing if number of free slots x average object size x this ratio "
"is larger than memory budget.");
namespace dfly {
using namespace std;
@ -137,8 +141,9 @@ bool PrimeEvictionPolicy::CanGrow(const PrimeTable& tbl) const {
// even though we may currently use less memory.
// see https://github.com/dragonflydb/dragonfly/issues/256#issuecomment-1227095503
size_t new_available = (tbl.capacity() - tbl.size()) + PrimeTable::kSegCapacity;
bool res = mem_budget_ >
int64_t(PrimeTable::kSegBytes + db_slice_->bytes_per_object() * new_available * 1.1);
bool res =
mem_budget_ > int64_t(PrimeTable::kSegBytes + db_slice_->bytes_per_object() * new_available *
GetFlag(FLAGS_table_growth_margin));
VLOG(2) << "available: " << new_available << ", res: " << res;
return res;