Merge pull request #1081 from percona/PBM-14780-pbm-restore-do-not-work-for-single-cpu

PBM-1478 PBM restore doesn't work by default on server with single CPU

Author: radoslawszulgo

cmd/pbm-agent/restore.go

@@ -184,7 +184,7 @@ func (a *Agent) Restore(ctx context.Context, r *ctrl.RestoreCmd, opid ctrl.OPID,
 }
 
 func getNumParallelCollsConfig(rParallelColls *int32, restoreConf *config.RestoreConf) int {
-	numParallelColls := runtime.NumCPU() / 2
+	numParallelColls := max(runtime.NumCPU()/2, 1)
 	if rParallelColls != nil && *rParallelColls > 0 {
 		numParallelColls = int(*rParallelColls)
 	} else if restoreConf != nil && restoreConf.NumParallelCollections > 0 {

cmd/pbm-agent/restore_test.go

@@ -87,7 +87,7 @@ func TestGetNumParallelCollsConfig(t *testing.T) {
 
 	rZeroParallelColls := int32(0)
 	rValidParallelColls := int32(99)
-	defaultValue := runtime.NumCPU() / 2
+	defaultValue := max(runtime.NumCPU()/2, 1)
 
 	tests := []struct {
 		name string