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This commit is contained in:
Thomas von Dein
2025-11-05 19:38:36 +01:00
parent 54a29bc7bb
commit c99e6e3f8a
5 changed files with 3 additions and 202 deletions
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33
Makefile
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# Copyright © 2023 Thomas von Dein
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# no need to modify anything below
tool = pgidler
dir = /home/postgres
pod = pgdkb-servicedbloadte4c2b6-0
all: buildlocal
buildlocal:
CGO_LDFLAGS='-static' go build -tags osusergo,netgo -ldflags="-extldflags=-static -s"
clean:
rm -rf $(tool) coverage.out
goupdate:
go get -t -u=patch ./...

3
README.md
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> [!IMPORTANT]
> This software is now being maintained on [Codeberg](https://codeberg.org/scip/pgidler/).
# pgidler # pgidler
Create idle postgres connections for testing Create idle postgres connections for testing

8
go.mod
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module pgidler
go 1.24
require (
github.com/lib/pq v1.10.9
github.com/spf13/pflag v1.0.10
)

6
go.sum
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github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/spf13/pflag v1.0.10 h1:4EBh2KAYBwaONj6b2Ye1GiHfwjqyROoF4RwYO+vPwFk=
github.com/spf13/pflag v1.0.10/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=

155
main.go
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/*
Copyright © 2023 Thomas von Dein
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Commentary:
This little program implements:
https://aws.amazon.com/blogs/database/performance-impact-of-idle-postgresql-connections/
It opens 1k concurrent postgres connections, does a couple of
selects and then stops doing anything further, thus creating
hanging idle sessions.
*/
package main
import (
"context"
"database/sql"
"fmt"
"log"
"sync"
"time"
_ "github.com/lib/pq"
flag "github.com/spf13/pflag"
)
type Tableschema struct {
Name string
}
const Maxloop int = 100
const Getschema string = "SELECT table_schema||'.'||table_name as relname from information_schema.tables WHERE table_schema='information_schema';"
const Gettable string = "SELECT * FROM information_schema.columns LIMIT 1;"
const StartTransaction string = "BEGIN TRANSACTION"
const HostConnection string = "user=%s dbname=%s password=%s"
const NetConnection string = "user=%s dbname=%s password=%s host=%s port=%d"
var wg sync.WaitGroup
func main() {
var optPasswd string
var optUser string
var optDatabase string
var optServer string
var optPort int
var optMaxconnections int
var optTimeout int
var optIdleTransaction bool
var ctx context.Context
var conn string
flag.StringVarP(&optPasswd, "password", "p", "", "Password of the database user")
flag.StringVarP(&optUser, "user", "u", "postgres", "Database user")
flag.StringVarP(&optDatabase, "database", "d", "postgres", "Database")
flag.StringVarP(&optServer, "server", "s", "localhost", "Server")
flag.IntVarP(&optMaxconnections, "client", "c", 500, "Number of concurrent users")
flag.IntVarP(&optPort, "port", "P", 5432, "TCP Port")
flag.IntVarP(&optTimeout, "timeout", "t", 0, "Wether to stop the clients after N seconds")
flag.BoolVarP(&optIdleTransaction, "idletransaction", "i", false, "Wether to stay in idle in transaction state")
flag.Parse()
if optServer != "" {
conn = fmt.Sprintf(NetConnection, optUser, optDatabase, optPasswd, optServer, optPort)
} else {
conn = fmt.Sprintf(HostConnection, optUser, optDatabase, optPasswd)
}
// first do a connection test
db, err := sql.Open("postgres", conn)
if err != nil {
log.Fatal(err)
}
db.Close()
log.Printf("DB Connection works, firing up %d clients\n", optMaxconnections)
if optTimeout > 0 {
ctx, _ = context.WithTimeout(context.Background(), time.Duration(optTimeout)*time.Second)
log.Printf("Clients will be killed after %d seconds", optTimeout)
} else {
ctx = context.TODO()
log.Println("Clients will run endlessly, abort with C-c")
}
wg.Add(optMaxconnections)
for m := 0; m < optMaxconnections; m++ {
go dbClient(ctx, conn, optIdleTransaction)
}
wg.Wait()
}
func dbClient(ctx context.Context, conn string, idle bool) {
defer wg.Done()
db, err := sql.Open("postgres", conn)
if err != nil {
log.Fatal(err)
}
if idle {
_, err := db.Exec(StartTransaction)
if err != nil {
log.Fatal(err)
}
}
rows, err := db.Query(Getschema)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
//log.Println("Got rows")
for rows.Next() {
var T Tableschema
if err := rows.Scan(&T.Name); err != nil {
log.Fatal(err)
}
//log.Printf("Got table %s\n", T.Name)
for i := 0; i < Maxloop; i++ {
rows, err := db.Query(Gettable)
if err != nil {
log.Fatal(err)
}
rows.Close() // ignore result
}
}
//log.Println("Got tables")
// block this thread forever or timeout
//select {}
select {
case <-time.After(1 * time.Second):
case <-ctx.Done():
}
}