Default to single threaded gathering of procs

Due to load spikes on servers with many processes it's better to gather procs in a single thread.

cmd/psstat.go

@@ -34,7 +34,7 @@ The options are:
   --cache-dir <name>      Name of the directory to store the stats cache (default: /mnt/psstat)
   --cache-name <name>     Name of the file to store the stats cache (in cache-dir)
 
-  --single-threaded       Run process gathering in a single thread, this can avoid strange load spikes on servers with many processes.
+  --multi-threaded        Run process gathering in multiple threads, this can cause strange load spikes on servers with many processes.
 
   --help                  Show this description
   --version               Show the current version
@@ -79,8 +79,8 @@ var fCacheDir = flag.String("cache-dir", "/tmp",
 var fCacheName = flag.String("cache-name", "psstat",
 	"store cache data in a file with this name")
 
-var fSingleThreaded = flag.Bool("single-threaded", false,
-	"Run process gathering on a single thread")
+var fMultiThreaded = flag.Bool("multi-threaded", false,
+	"Run process gathering on a multiple threads")
 
 var fVersion = flag.Bool("version", false, "Show the current version")
 
@@ -183,7 +183,7 @@ func main() {
 	// Aggregate all known processes
 	currentTime := time.Now().UnixNano()
 	var procs map[PID]*Process
-	procs, err = GatherAllProcs(*fSingleThreaded)
+	procs, err = GatherAllProcs(*fMultiThreaded)
 	if err != nil {
 		exitError("Failed to gather process information:", err)
 	}

process/process.go

@@ -32,11 +32,11 @@ type Process struct {
 //
 // When it builds the map, the relevant information of a Process is read from
 // stat and statm
-func GatherAllProcs(singleThreaded bool) (map[PID]*Process, error) {
-	if singleThreaded {
-		return GatherAllProcsSingleThreaded()
-	} else {
+func GatherAllProcs(multiThreaded bool) (map[PID]*Process, error) {
+	if multiThreaded {
 		return GatherAllProcsMultiThreaded()
+	} else {
+		return GatherAllProcsSingleThreaded()
 	}
 }