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Merge PR #4161: New experimental simulation runner
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Original file line number | Diff line number | Diff line change |
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package main | ||
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import ( | ||
"flag" | ||
"fmt" | ||
"io/ioutil" | ||
"log" | ||
"os" | ||
"os/exec" | ||
"os/signal" | ||
"path/filepath" | ||
"strings" | ||
"sync" | ||
"syscall" | ||
"time" | ||
) | ||
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var ( | ||
// default seeds | ||
seeds = []int{ | ||
1, 2, 4, 7, 32, 123, 124, 582, 1893, 2989, | ||
3012, 4728, 37827, 981928, 87821, 891823782, | ||
989182, 89182391, 11, 22, 44, 77, 99, 2020, | ||
3232, 123123, 124124, 582582, 18931893, | ||
29892989, 30123012, 47284728, 37827, | ||
} | ||
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// goroutine-safe process map | ||
procs map[int]*os.Process | ||
mutex *sync.Mutex | ||
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// results channel | ||
results chan bool | ||
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// command line arguments and options | ||
jobs int | ||
blocks string | ||
period string | ||
testname string | ||
genesis string | ||
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// logs temporary directory | ||
tempdir string | ||
) | ||
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func init() { | ||
log.SetPrefix("") | ||
log.SetFlags(0) | ||
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procs = map[int]*os.Process{} | ||
mutex = &sync.Mutex{} | ||
flag.IntVar(&jobs, "j", 10, "Number of parallel processes") | ||
flag.StringVar(&genesis, "g", "", "Genesis file") | ||
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flag.Usage = func() { | ||
fmt.Fprintf(flag.CommandLine.Output(), | ||
`Usage: %s [-j maxprocs] [-g genesis.json] [blocks] [period] [testname] | ||
Run simulations in parallel | ||
`, filepath.Base(os.Args[0])) | ||
flag.PrintDefaults() | ||
} | ||
} | ||
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func main() { | ||
var err error | ||
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flag.Parse() | ||
if flag.NArg() != 3 { | ||
log.Fatal("wrong number of arguments") | ||
} | ||
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// prepare input channel | ||
queue := make(chan int, len(seeds)) | ||
for _, seed := range seeds { | ||
queue <- seed | ||
} | ||
close(queue) | ||
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// jobs cannot be > len(seeds) | ||
if jobs > len(seeds) { | ||
jobs = len(seeds) | ||
} | ||
results = make(chan bool, len(seeds)) | ||
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// setup signal handling | ||
sigs := make(chan os.Signal, 1) | ||
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM) | ||
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go func() { | ||
_ = <-sigs | ||
fmt.Println() | ||
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// drain the queue | ||
log.Printf("Draining seeds queue...") | ||
for seed := range queue { | ||
log.Printf("%d", seed) | ||
} | ||
log.Printf("Kill all remaining processes...") | ||
killAllProcs() | ||
os.Exit(1) | ||
}() | ||
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// initialise common test parameters | ||
blocks = flag.Arg(0) | ||
period = flag.Arg(1) | ||
testname = flag.Arg(2) | ||
tempdir, err = ioutil.TempDir("", "") | ||
if err != nil { | ||
log.Fatal(err) | ||
} | ||
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// set up worker pool | ||
wg := sync.WaitGroup{} | ||
for workerId := 0; workerId < jobs; workerId++ { | ||
wg.Add(1) | ||
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go func(workerId int) { | ||
defer wg.Done() | ||
worker(workerId, queue) | ||
}(workerId) | ||
} | ||
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// idiomatic hack required to use wg.Wait() with select | ||
waitCh := make(chan struct{}) | ||
go func() { | ||
defer close(waitCh) | ||
wg.Wait() | ||
}() | ||
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wait: | ||
for { | ||
select { | ||
case <-waitCh: | ||
break wait | ||
case <-time.After(1 * time.Minute): | ||
fmt.Println(".") | ||
} | ||
} | ||
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// analyse results and exit with 1 on first error | ||
close(results) | ||
for rc := range results { | ||
if !rc { | ||
os.Exit(1) | ||
} | ||
} | ||
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os.Exit(0) | ||
} | ||
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func buildCommand(testname, blocks, period, genesis string, seed int) string { | ||
return fmt.Sprintf("go test github.com/cosmos/cosmos-sdk/cmd/gaia/app -run %s -SimulationEnabled=true "+ | ||
"-SimulationNumBlocks=%s -SimulationGenesis=%s "+ | ||
"-SimulationVerbose=true -SimulationCommit=true -SimulationSeed=%d -SimulationPeriod=%s -v -timeout 24h", | ||
testname, blocks, genesis, seed, period) | ||
} | ||
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func makeCmd(cmdStr string) *exec.Cmd { | ||
cmdSlice := strings.Split(cmdStr, " ") | ||
return exec.Command(cmdSlice[0], cmdSlice[1:]...) | ||
} | ||
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func makeFilename(seed int) string { | ||
return fmt.Sprintf("gaia-simulation-seed-%d-date-%s", seed, time.Now().Format("01-02-2006_15:04:05.000000000")) | ||
} | ||
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func worker(id int, seeds <-chan int) { | ||
log.Printf("[W%d] Worker is up and running", id) | ||
for seed := range seeds { | ||
if err := spawnProc(id, seed); err != nil { | ||
results <- false | ||
log.Printf("[W%d] Seed %d: FAILED", id, seed) | ||
log.Printf("To reproduce run: %s", buildCommand(testname, blocks, period, genesis, seed)) | ||
} else { | ||
log.Printf("[W%d] Seed %d: OK", id, seed) | ||
} | ||
} | ||
log.Printf("[W%d] no seeds left, shutting down", id) | ||
} | ||
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func spawnProc(workerId int, seed int) error { | ||
stderrFile, _ := os.Create(filepath.Join(tempdir, makeFilename(seed)+".stderr")) | ||
stdoutFile, _ := os.Create(filepath.Join(tempdir, makeFilename(seed)+".stdout")) | ||
s := buildCommand(testname, blocks, period, genesis, seed) | ||
cmd := makeCmd(s) | ||
cmd.Stdout = stdoutFile | ||
cmd.Stderr = stderrFile | ||
err := cmd.Start() | ||
if err != nil { | ||
log.Printf("couldn't start %q", s) | ||
return err | ||
} | ||
log.Printf("[W%d] Spawned simulation with pid %d [seed=%d stdout=%s stderr=%s]", | ||
workerId, cmd.Process.Pid, seed, stdoutFile.Name(), stderrFile.Name()) | ||
pushProcess(cmd.Process) | ||
defer popProcess(cmd.Process) | ||
return cmd.Wait() | ||
} | ||
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func pushProcess(proc *os.Process) { | ||
mutex.Lock() | ||
defer mutex.Unlock() | ||
procs[proc.Pid] = proc | ||
} | ||
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func popProcess(proc *os.Process) { | ||
mutex.Lock() | ||
defer mutex.Unlock() | ||
if _, ok := procs[proc.Pid]; ok { | ||
delete(procs, proc.Pid) | ||
} | ||
} | ||
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func killAllProcs() { | ||
mutex.Lock() | ||
defer mutex.Unlock() | ||
for _, proc := range procs { | ||
checkSignal(proc, syscall.SIGTERM) | ||
checkSignal(proc, syscall.SIGKILL) | ||
} | ||
} | ||
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func checkSignal(proc *os.Process, signal syscall.Signal) { | ||
if err := proc.Signal(signal); err != nil { | ||
log.Printf("Failed to send %s to PID %d", signal, proc.Pid) | ||
} | ||
} |
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