ignore slots xmin in MtmAdjustOldestXid

Author: kelvich

multimaster.c

@@ -963,7 +963,7 @@ static void
 MtmBeginTransaction(MtmCurrentTrans* x)
 {
 	if (x->snapshot == INVALID_CSN) {
-		TransactionId xmin = (Mtm->gcCount >= MtmGcPeriod) ? PgGetOldestXmin(NULL, false) : InvalidTransactionId; /* Get oldest xmin outside critical section */
+		TransactionId xmin = (Mtm->gcCount >= MtmGcPeriod) ? PgGetOldestXminNoslot(NULL, false) : InvalidTransactionId; /* Get oldest xmin outside critical section */
 
 		Assert(!x->isActive);
 		MtmLock(LW_EXCLUSIVE);
@@ -2849,7 +2849,7 @@ _PG_init(void)
 		"Number of distributed transactions after which garbage collection is started",
 		"Multimaster is building xid->csn hash map which has to be cleaned to avoid hash overflow. This parameter specifies interval of invoking garbage collector for this map",
 		&MtmGcPeriod,
-		MTM_HASH_SIZE/10,
+		1000,
 		1,
 		INT_MAX,
 		PGC_BACKEND,

tests/run.sh

@@ -1,5 +1,7 @@
+./dtmbench -i -a 100000 -c "dbname=regression host=localhost port=5434 sslmode=disable"
+
 ./dtmbench  \
 -c "dbname=regression host=localhost port=5432 sslmode=disable" \
 -c "dbname=regression host=localhost port=5433 sslmode=disable" \
 -c "dbname=regression host=localhost port=5434 sslmode=disable" \
--n 1000 -a 1000 -w 10 -r 1 $*
+-n 10000 -a 100000 -w 30 -r 10 $*