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Commitdbad0e8

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committed
Support work with large snapshots
1 parent5317b56 commitdbad0e8

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5 files changed

+39
-20
lines changed

5 files changed

+39
-20
lines changed

‎contrib/pg_dtm/libdtm.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -301,7 +301,7 @@ void DtmInitSnapshot(Snapshot snapshot)
301301
* we are in recovery, see later comments.
302302
*/
303303
snapshot->xip= (TransactionId*)
304-
malloc(GetMaxSnapshotXidCount()*sizeof(TransactionId));
304+
malloc(GetMaxSnapshotSubxidCount()*sizeof(TransactionId));
305305
if (snapshot->xip==NULL)
306306
ereport(ERROR,
307307
(errcode(ERRCODE_OUT_OF_MEMORY),

‎contrib/pg_dtm/pg_dtm.c‎

Lines changed: 33 additions & 16 deletions
Original file line numberDiff line numberDiff line change
@@ -205,22 +205,39 @@ static void DtmMergeWithGlobalSnapshot(Snapshot dst)
205205
if (src->xmin<dst->xmin) {
206206
dst->xmin=src->xmin;
207207
}
208-
209-
n=dst->xcnt;
210-
Assert(src->xcnt+n <=GetMaxSnapshotXidCount());
211-
memcpy(dst->xip+n,src->xip,src->xcnt*sizeof(TransactionId));
212-
n+=src->xcnt;
213-
214-
qsort(dst->xip,n,sizeof(TransactionId),xidComparator);
215-
xid=InvalidTransactionId;
216-
217-
for (i=0,j=0;i<n&&dst->xip[i]<dst->xmax;i++) {
218-
if (dst->xip[i]!=xid) {
219-
dst->xip[j++]=xid=dst->xip[i];
220-
}
221-
}
222-
dst->xcnt=j;
223-
208+
Assert(src->subxcnt==0);
209+
210+
if (src->xcnt+dst->subxcnt+dst->xcnt <=GetMaxSnapshotXidCount()) {
211+
Assert(dst->subxcnt==0);
212+
memcpy(dst->xip+dst->xcnt,src->xip,src->xcnt*sizeof(TransactionId));
213+
n=dst->xcnt+src->xcnt;
214+
215+
qsort(dst->xip,n,sizeof(TransactionId),xidComparator);
216+
xid=InvalidTransactionId;
217+
218+
for (i=0,j=0;i<n&&dst->xip[i]<dst->xmax;i++) {
219+
if (dst->xip[i]!=xid) {
220+
dst->xip[j++]=xid=dst->xip[i];
221+
}
222+
}
223+
dst->xcnt=j;
224+
}else {
225+
Assert(src->xcnt+dst->subxcnt+dst->xcnt <=GetMaxSnapshotSubxidCount());
226+
memcpy(dst->subxip+dst->subxcnt,dst->xip,dst->xcnt*sizeof(TransactionId));
227+
memcpy(dst->subxip+dst->subxcnt+dst->xcnt,src->xip,src->xcnt*sizeof(TransactionId));
228+
n=dst->xcnt+dst->subxcnt+src->xcnt;
229+
230+
qsort(dst->subxip,n,sizeof(TransactionId),xidComparator);
231+
xid=InvalidTransactionId;
232+
233+
for (i=0,j=0;i<n&&dst->subxip[i]<dst->xmax;i++) {
234+
if (dst->subxip[i]!=xid) {
235+
dst->subxip[j++]=xid=dst->subxip[i];
236+
}
237+
}
238+
dst->subxcnt=j;
239+
dst->xcnt=0;
240+
}
224241
DumpSnapshot(dst,"merged");
225242
}
226243

‎contrib/pg_dtm/sockhub/start-clients.sh‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
n_clients=100
1+
n_clients=200
22
n_iters=100000
33
./sockhub -h$1 -p 5001 -f /tmp/p5002&
44
for((i=0;i<n_clients;i++))

‎contrib/pg_dtm/tests/transfers.go‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -207,7 +207,8 @@ func prepare_one(connstr string, wg *sync.WaitGroup) {
207207
}
208208
exec(conn,"drop table if exists t")
209209
exec(conn,"create table t(u int primary key, v int)")
210-
210+
exec(conn,"insert into t (select generate_series(0,1000000), $1)",cfg.Accounts.Balance)
211+
/*
211212
exec(conn, "begin transaction isolation level " + cfg.Isolation)
212213
213214
start := time.Now()
@@ -223,7 +224,7 @@ func prepare_one(connstr string, wg *sync.WaitGroup) {
223224
start = time.Now()
224225
}
225226
}
226-
227+
*/
227228
exec(conn,"commit")
228229
wg.Done()
229230
}

‎contrib/pg_dtm/tests/transfers.sh‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -3,4 +3,5 @@ go run transfers.go \
33
-d'dbname=postgres port=5432' \
44
-d'dbname=postgres port=5433' \
55
-m \
6+
-w 128 \
67
-g

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