diff --git a/config/config.go b/config/config.go
index a2f6923..acdaf6a 100644
--- a/config/config.go
+++ b/config/config.go
@@ -3,8 +3,6 @@ package config
 import (
 	"fmt"
 	"git.binarythought.com/cdramey/alrm/alarm"
-	"runtime"
-	"strconv"
 	"time"
 )
 
@@ -12,15 +10,13 @@ type Config struct {
 	Groups   map[string]*Group
 	Alarms   map[string]alarm.Alarm
 	Interval time.Duration
-	Threads  int
+	Hash     string
 }
 
 func NewConfig() *Config {
 	return &Config{
 		// Default check interval, 30 seconds
 		Interval: time.Second * 30,
-		// Default number of threads, use local CPU count
-		Threads: runtime.NumCPU(),
 	}
 }
 
@@ -66,16 +62,6 @@ func (c *Config) SetInterval(val string) error {
 	return nil
 }
 
-func (c *Config) SetThreads(val string) error {
-	threads, err := strconv.Atoi(val)
-	if err != nil {
-		return err
-	}
-
-	c.Threads = threads
-	return nil
-}
-
 func ReadConfig(fn string, debuglvl int) (*Config, error) {
 	parser := &Parser{DebugLevel: debuglvl}
 	config, err := parser.Parse(fn)
diff --git a/config/parser.go b/config/parser.go
index 4e06f67..e84bb01 100644
--- a/config/parser.go
+++ b/config/parser.go
@@ -1,6 +1,7 @@
 package config
 
 import (
+	"encoding/hex"
 	"fmt"
 	"git.binarythought.com/cdramey/alrm/alarm"
 	"git.binarythought.com/cdramey/alrm/check"
@@ -69,14 +70,6 @@ func (p *Parser) Parse(fn string) (*Config, error) {
 						fn, tok.Line(), value,
 					)
 				}
-			case "threads":
-				err := config.SetThreads(value)
-				if err != nil {
-					return nil, fmt.Errorf(
-						"invalid number for interval in %s, line %d: \"%s\"",
-						fn, tok.Line(), value,
-					)
-				}
 			default:
 				return nil, fmt.Errorf("unknown key for set in %s, line %d: \"%s\"",
 					fn, tok.Line(), tk,
@@ -207,6 +200,7 @@ func (p *Parser) Parse(fn string) (*Config, error) {
 	if err := tok.Err(); err != nil {
 		return nil, err
 	}
+	config.Hash = hex.EncodeToString(tok.Hash.Sum(nil))
 	return config, nil
 }
 
diff --git a/config/tokenizer.go b/config/tokenizer.go
index 31b66ce..3db4050 100644
--- a/config/tokenizer.go
+++ b/config/tokenizer.go
@@ -2,6 +2,9 @@ package config
 
 import (
 	"bufio"
+	"crypto/sha256"
+	"fmt"
+	"hash"
 	"io"
 	"os"
 	"strings"
@@ -16,6 +19,7 @@ const (
 )
 
 type Tokenizer struct {
+	Hash    hash.Hash
 	curline int
 	repline int
 	file    *os.File
@@ -32,6 +36,7 @@ func NewTokenizer(fn string) (*Tokenizer, error) {
 		return nil, err
 	}
 
+	tk.Hash = sha256.New()
 	tk.reader = bufio.NewReader(tk.file)
 	return tk, nil
 }
@@ -53,6 +58,11 @@ func (t *Tokenizer) Scan() bool {
 		if t.err != nil {
 			break
 		}
+		if r == unicode.ReplacementChar {
+			t.err = fmt.Errorf("invalid utf-8 encoding on line %s", t.repline)
+			break
+		}
+		t.Hash.Write([]byte(string(r)))
 
 		switch state {
 		case TK_NONE:
diff --git a/server.go b/server.go
index 571d565..10ae568 100644
--- a/server.go
+++ b/server.go
@@ -3,13 +3,12 @@ package main
 import (
 	"fmt"
 	"git.binarythought.com/cdramey/alrm/config"
-	"time"
 	"sync"
+	"time"
 )
 
 func startServer(cfg *config.Config, debuglvl int) error {
-	m := sync.Mutex{}
-	c := sync.NewCond(&m)
+	c := sync.NewCond(&sync.Mutex{})
 	for _, g := range cfg.Groups {
 		go worker(g, c, debuglvl)
 	}
@@ -30,9 +29,15 @@ func startServer(cfg *config.Config, debuglvl int) error {
 
 func worker(g *config.Group, c *sync.Cond, debuglvl int) {
 	for {
+		if debuglvl > 2 {
+			fmt.Printf("%s goroutine waiting.. \n", g.Name)
+		}
 		c.L.Lock()
 		c.Wait()
 		c.L.Unlock()
+		if debuglvl > 2 {
+			fmt.Printf("%s goroutine wake.. \n", g.Name)
+		}
 
 		for _, h := range g.Hosts {
 			for _, c := range h.Checks {