diff --git a/start_qemu/start.sh b/start_qemu/start.sh
index aa050c2..7129bd8 100644
--- a/start_qemu/start.sh
+++ b/start_qemu/start.sh
@@ -2,6 +2,7 @@
 hda="disco.qcow2"
 mem="8G"
 diskSize="40G"
+nCores="4"
 pwd="$(pwd)";path=${BASH_SOURCE[0]}
 dir="$(echo "$pwd/$path"| rev | cut -d "/" -f2-100|rev)"
 cd $dir
@@ -17,11 +18,11 @@ function createQcow2 {
 function checkQcow2 { if [ ! -f "$dir/$hda" ]; then createQcow2; fi }
 
 function bootCD {
-  qemu-system-x86_64 -enable-kvm -m $mem -cpu host -machine type=pc,accel=kvm -boot d -cdrom $iso -hda $hda
+  qemu-system-x86_64 -enable-kvm -m $mem -cpu host -smp $nCores -machine type=pc,accel=kvm -boot d -cdrom $iso -hda $hda
 }
 
 function bootHD {
-  qemu-system-x86_64 -enable-kvm -m $mem -cpu host -machine type=pc,accel=kvm -net nic,model=e1000 -hda $hda -net user
+  qemu-system-x86_64 -enable-kvm -m $mem -cpu host -smp $nCores -machine type=pc,accel=kvm -net nic,model=e1000 -hda $hda -net user
 }
 
 function showHelp {