open 1 conn at a time

cmd/pg-pulse/main.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"sync"
 	"time"
 
 	"gitea.bel.blue/bel/with"
@@ -30,7 +31,11 @@ func run(ctx context.Context) error {
 	}
 
 	for i := 0; i < *p-1; i++ {
+		func() {
+			connected := &sync.WaitGroup{}
+			connected.Add(1)
 			go with.PSQL(ctx, *c, func(pg *sql.DB) error {
+				connected.Done()
 				with.GoEvery(ctx, *d, func() {
 					if _, err := pg.ExecContext(ctx, `SELECT 1`); err != nil {
 						log.Println("!", err)
@@ -38,6 +43,8 @@ func run(ctx context.Context) error {
 				})
 				return ctx.Err()
 			})
+			connected.Wait()
+		}()
 	}
 
 	return with.PSQL(ctx, *c, func(pg *sql.DB) error {