/
main.go
138 lines (114 loc) · 2.46 KB
/
main.go
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package main
import (
"database/sql"
"flag"
"fmt"
"math/rand"
"os"
"time"
_ "github.com/mattn/go-sqlite3"
"golang.org/x/sync/errgroup"
)
var (
initialize = flag.Bool("init", false, "initialize schema & exit")
n = flag.Int("n", 1000, "iterations")
parallel = flag.Int("parallel", 1, "parallel goroutines")
)
const RowN = 100_000_000
const (
ZipfS = 1.5
ZipfV = 8
)
func main() {
if err := run(); err != nil {
fmt.Fprintln(os.Stderr, err)
}
}
func run() error {
flag.Parse()
if flag.NArg() == 0 {
return fmt.Errorf("DSN required")
} else if flag.NArg() > 1 {
return fmt.Errorf("too many arguments")
}
dsn := flag.Arg(0)
db, err := sql.Open("sqlite3", dsn)
if err != nil {
return err
}
defer db.Close()
if _, err := db.Exec(`PRAGMA busy_timeout = 5000;`); err != nil {
return err
}
if *initialize {
return initDB(db)
}
// Setup input.
ch := make(chan struct{}, *n)
for i := 0; i < *n; i++ {
ch <- struct{}{}
}
close(ch)
// Create distribution.
zipf := rand.NewZipf(rand.New(rand.NewSource(0)), ZipfS, ZipfV, RowN)
// Initialize connection.
if err := runIter(db, 1); err != nil {
return err
}
t0 := time.Now()
// Execute in parallel.
var g errgroup.Group
for i := 0; i < *parallel; i++ {
g.Go(func() error {
for range ch {
if err := runIter(db, int(zipf.Uint64())+1); err != nil {
return err
}
}
return nil
})
}
if err := g.Wait(); err != nil {
return err
}
elapsed := time.Since(t0)
fmt.Printf("%d iterations completed in %fs (%s/iter)\n", *n, elapsed.Seconds(), (elapsed / time.Duration(*n)).String())
return nil
}
func initDB(db *sql.DB) error {
if _, err := db.Exec(`PRAGMA journal_mode = WAL;`); err != nil {
return err
}
if _, err := db.Exec(`CREATE TABLE t (id INTEGER PRIMARY KEY, name TEXT);`); err != nil {
return err
}
var index int
for i := 0; i < 1000; i++ {
if err := func() error {
tx, err := db.Begin()
if err != nil {
return err
}
defer tx.Rollback()
fmt.Printf("[inserting] %d\n", index)
for j := 0; j < 100000; j++ {
index++
if _, err := tx.Exec(fmt.Sprintf(`INSERT INTO t (id, name) VALUES (%d, '%8x');`, index, index)); err != nil {
return err
}
}
return tx.Commit()
}(); err != nil {
return err
}
}
fmt.Println("[done]")
return nil
}
func runIter(db *sql.DB, id int) error {
var name string
if err := db.QueryRow(`SELECT name FROM t WHERE id = ?`, id).Scan(&name); err != nil {
return err
}
return nil
}