func makeInternalPlanner(
opName string, txn *client.Txn, user string, memMetrics *MemoryMetrics,
) *planner {
p := makePlanner(opName)
p.setTxn(txn)
p.resetContexts()
p.session.User = user
p.session.mon = mon.MakeUnlimitedMonitor(p.session.context,
"internal-root",
memMetrics.CurBytesCount, memMetrics.MaxBytesHist,
noteworthyInternalMemoryUsageBytes)
p.session.sessionMon = mon.MakeMonitor("internal-session",
memMetrics.SessionCurBytesCount,
memMetrics.SessionMaxBytesHist,
-1, noteworthyInternalMemoryUsageBytes/5)
p.session.sessionMon.Start(p.session.context, &p.session.mon, mon.BoundAccount{})
p.session.TxnState.mon = mon.MakeMonitor("internal-txn",
memMetrics.TxnCurBytesCount,
memMetrics.TxnMaxBytesHist,
-1, noteworthyInternalMemoryUsageBytes/5)
p.session.TxnState.mon.Start(p.session.context, &p.session.mon, mon.BoundAccount{})
return p
}
// MakeServer creates a Server.
func MakeServer(
ambientCtx log.AmbientContext,
cfg *base.Config,
executor *sql.Executor,
internalMemMetrics *sql.MemoryMetrics,
maxSQLMem int64,
) *Server {
server := &Server{
AmbientCtx: ambientCtx,
cfg: cfg,
executor: executor,
metrics: makeServerMetrics(internalMemMetrics),
}
server.sqlMemoryPool = mon.MakeMonitor("sql",
server.metrics.SQLMemMetrics.CurBytesCount,
server.metrics.SQLMemMetrics.MaxBytesHist,
0, noteworthySQLMemoryUsageBytes)
server.sqlMemoryPool.Start(context.Background(), nil, mon.MakeStandaloneBudget(maxSQLMem))
server.connMonitor = mon.MakeMonitor("conn",
server.metrics.ConnMemMetrics.CurBytesCount,
server.metrics.ConnMemMetrics.MaxBytesHist,
int64(connReservationBatchSize)*baseSQLMemoryBudget, noteworthyConnMemoryUsageBytes)
server.connMonitor.Start(context.Background(), &server.sqlMemoryPool, mon.BoundAccount{})
return server
}
func (s *Session) deriveAndStartMonitors() {
s.sessionMon = mon.MakeMonitor("session",
s.memMetrics.SessionCurBytesCount,
s.memMetrics.SessionMaxBytesHist,
-1, noteworthyMemoryUsageBytes)
s.sessionMon.Start(s.context, &s.mon, mon.BoundAccount{})
// We merely prepare the txn monitor here. It is fully started in
// resetForNewSQLTxn().
s.TxnState.mon = mon.MakeMonitor("txn",
s.memMetrics.TxnCurBytesCount,
s.memMetrics.TxnMaxBytesHist,
-1, noteworthyMemoryUsageBytes)
}
// StartMonitor interfaces between Session and mon.MemoryMonitor
func (s *Session) StartMonitor(pool *mon.MemoryMonitor, reserved mon.BoundAccount) {
// Note: we pass `reserved` to s.mon where it causes `s.mon` to act
// as a buffer. This is not done for sessionMon nor TxnState.mon:
// these monitors don't start with any buffer, so they'll need to
// ask their "parent" for memory as soon as the first
// allocation. This is acceptable because the session is single
// threaded, and the point of buffering is just to avoid contention.
s.mon = mon.MakeMonitor("root",
s.memMetrics.CurBytesCount,
s.memMetrics.MaxBytesHist,
-1, math.MaxInt64)
s.mon.Start(s.context, pool, reserved)
s.deriveAndStartMonitors()
}