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Commitaaec649

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committed
Add cursors using to transfers test.
1 parenta69772f commitaaec649

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3 files changed

+78
-19
lines changed

3 files changed

+78
-19
lines changed

‎contrib/pg_dtm/pg_dtm--1.0.sql‎

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -16,3 +16,7 @@ LANGUAGE C;
1616
CREATEFUNCTIONdtm_get_current_snapshot_xmax() RETURNSinteger
1717
AS'MODULE_PATHNAME','dtm_get_current_snapshot_xmax'
1818
LANGUAGE C;
19+
20+
CREATEFUNCTIONdtm_get_current_snapshot_xcnt() RETURNSinteger
21+
AS'MODULE_PATHNAME','dtm_get_current_snapshot_xcnt'
22+
LANGUAGE C;

‎contrib/pg_dtm/pg_dtm.c‎

Lines changed: 7 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -775,6 +775,7 @@ PG_FUNCTION_INFO_V1(dtm_begin_transaction);
775775
PG_FUNCTION_INFO_V1(dtm_join_transaction);
776776
PG_FUNCTION_INFO_V1(dtm_get_current_snapshot_xmax);
777777
PG_FUNCTION_INFO_V1(dtm_get_current_snapshot_xmin);
778+
PG_FUNCTION_INFO_V1(dtm_get_current_snapshot_xcnt);
778779

779780
Datum
780781
dtm_get_current_snapshot_xmin(PG_FUNCTION_ARGS)
@@ -788,6 +789,12 @@ dtm_get_current_snapshot_xmax(PG_FUNCTION_ARGS)
788789
PG_RETURN_INT32(CurrentTransactionSnapshot->xmax);
789790
}
790791

792+
Datum
793+
dtm_get_current_snapshot_xcnt(PG_FUNCTION_ARGS)
794+
{
795+
PG_RETURN_INT32(CurrentTransactionSnapshot->xcnt);
796+
}
797+
791798
Datum
792799
dtm_begin_transaction(PG_FUNCTION_ARGS)
793800
{

‎contrib/pg_dtm/tests/transfers.go‎

Lines changed: 67 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -15,6 +15,9 @@ const (
1515
N_ACCOUNTS=100000
1616
//ISOLATION_LEVEL = "repeatable read"
1717
ISOLATION_LEVEL="read committed"
18+
GLOBAL_UPDATES=true
19+
LOCAL_UPDATES=false
20+
CURSORS=false
1821
)
1922

2023

@@ -134,28 +137,71 @@ func transfer(id int, cCommits chan int, cAborts chan int, wg *sync.WaitGroup) {
134137
amount:=1
135138
account1:=rand.Intn(N_ACCOUNTS)
136139
account2:=rand.Intn(N_ACCOUNTS)
140+
srci:=rand.Intn(2)
141+
dsti:=rand.Intn(2)
142+
if (srci>dsti) {
143+
srci,dsti=dsti,srci
144+
}
137145

138-
src:=conn[0]
139-
dst:=conn[1]
146+
src:=conn[srci]
147+
dst:=conn[dsti]
140148

141-
xid=execQuery(src,"select dtm_begin_transaction()")
142-
exec(dst,"select dtm_join_transaction($1)",xid)
149+
ifsrc==dst {
150+
// local update
151+
if!LOCAL_UPDATES {
152+
// which we do not want
153+
continue
154+
}
143155

144-
// start transaction
145-
exec(src,"begin transaction isolation level "+ISOLATION_LEVEL)
146-
exec(dst,"begin transaction isolation level "+ISOLATION_LEVEL)
156+
exec(src,"begin transaction isolation level "+ISOLATION_LEVEL)
157+
ok1:=execUpdate(src,"update t set v = v - $1 where u=$2",amount,account1)
158+
ok2:=execUpdate(src,"update t set v = v + $1 where u=$2",amount,account2)
159+
if!ok1||!ok2 {
160+
exec(src,"rollback")
161+
nAborts+=1
162+
}else {
163+
exec(src,"commit")
164+
nCommits+=1
165+
myCommits+=1
166+
}
167+
}else {
168+
// global update
169+
if!GLOBAL_UPDATES {
170+
// which we do not want
171+
continue
172+
}
147173

148-
ok1:=execUpdate(src,"update t set v = v - $1 where u=$2",amount,account1)
149-
ok2:=execUpdate(dst,"update t set v = v + $1 where u=$2",amount,account2)
174+
xid=execQuery(src,"select dtm_begin_transaction()")
175+
exec(dst,"select dtm_join_transaction($1)",xid)
150176

151-
if!ok1||!ok2 {
152-
exec(src,"rollback")
153-
exec(dst,"rollback")
154-
nAborts+=1
155-
}else {
156-
commit(src,dst)
157-
nCommits+=1
158-
myCommits+=1
177+
// start transaction
178+
exec(src,"begin transaction isolation level "+ISOLATION_LEVEL)
179+
exec(dst,"begin transaction isolation level "+ISOLATION_LEVEL)
180+
181+
ok:=true
182+
if (CURSORS) {
183+
exec(src,"declare cur0 cursor for select * from t where u=$1 for update",account1)
184+
exec(dst,"declare cur0 cursor for select * from t where u=$1 for update",account2)
185+
186+
ok=execUpdate(src,"fetch from cur0")&&ok
187+
ok=execUpdate(dst,"fetch from cur0")&&ok
188+
189+
ok=execUpdate(src,"update t set v = v - $1 where current of cur0",amount)&&ok
190+
ok=execUpdate(dst,"update t set v = v + $1 where current of cur0",amount)&&ok
191+
}else {
192+
ok=execUpdate(src,"update t set v = v - $1 where u=$2",amount,account1)&&ok
193+
ok=execUpdate(dst,"update t set v = v + $1 where u=$2",amount,account2)&&ok
194+
}
195+
196+
ifok {
197+
commit(src,dst)
198+
nCommits+=1
199+
myCommits+=1
200+
}else {
201+
exec(src,"rollback")
202+
exec(dst,"rollback")
203+
nAborts+=1
204+
}
159205
}
160206

161207
iftime.Since(start).Seconds()>1 {
@@ -197,11 +243,13 @@ func inspect(wg *sync.WaitGroup) {
197243
if (sum!=prevSum) {
198244
xmin1:=execQuery(conn1,"select dtm_get_current_snapshot_xmin()")
199245
xmax1:=execQuery(conn1,"select dtm_get_current_snapshot_xmax()")
246+
xcnt1:=execQuery(conn1,"select dtm_get_current_snapshot_xcnt()")
200247
xmin2:=execQuery(conn2,"select dtm_get_current_snapshot_xmin()")
201248
xmax2:=execQuery(conn2,"select dtm_get_current_snapshot_xmax()")
249+
xcnt2:=execQuery(conn2,"select dtm_get_current_snapshot_xcnt()")
202250
fmt.Printf(
203-
"Total=%d xid=%d snap1=[%d, %d) snap2=[%d, %d)\n",
204-
sum,xid,xmin1,xmax1,xmin2,xmax2,
251+
"Total=%d xid=%d snap1=[%d, %d){%d} snap2=[%d, %d){%d}\n",
252+
sum,xid,xmin1,xmax1,xcnt1,xmin2,xmax2,xcnt2,
205253
)
206254
prevSum=sum
207255
}

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