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// ioworkload is a standalone binary that performs deterministic I/O operations
// for integration testing of ior. It prints its PID to stdout, sleeps to allow
// ior to attach BPF tracepoints, then executes the requested I/O scenario.
package main
import (
"flag"
"fmt"
"os"
"slices"
"time"
)
// Give ior enough time to attach tracepoints before scenarios emit syscalls.
// Under slower CI or locally saturated systems, 5s can still miss first-call
// events for single-shot scenarios. Use a slightly larger delay for stability.
const startupDelay = 8 * time.Second
func main() {
scenario := flag.String("scenario", "", "I/O scenario to execute")
flag.Parse()
if *scenario == "" {
fmt.Fprintln(os.Stderr, "usage: ioworkload --scenario=<name>")
os.Exit(2)
}
run, ok := scenarios[*scenario]
if !ok {
fmt.Fprintf(os.Stderr, "unknown scenario: %s\navailable scenarios:\n", *scenario)
var names []string
for name := range scenarios {
names = append(names, name)
}
slices.Sort(names)
for _, name := range names {
fmt.Fprintf(os.Stderr, " %s\n", name)
}
os.Exit(2)
}
fmt.Println(os.Getpid())
time.Sleep(startupDelay)
if err := run(); err != nil {
fmt.Fprintf(os.Stderr, "scenario %s failed: %v\n", *scenario, err)
os.Exit(1)
}
}
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