diff --git a/get_algos.py b/get_algos.py
index 3582b2c..84c4ecd 100755
--- a/get_algos.py
+++ b/get_algos.py
@@ -3,16 +3,22 @@
 import os
 import sys
 import shutil
+import random
 import subprocess
 
 def bench(algo_dir):
     print(algo_dir)
-    build_dir = "build"
-    assets_dir = "assets"
-    while os.path.isdir(build_dir):
-        shutil.rmtree(build_dir)
+    build_dir = None
+    while build_dir is None:
+        r = "%09d" % random.randint(0, 999999999)
+        d = os.path.join("build", r)
+        if not os.path.isdir(d):
+            build_dir = d
+    
     shutil.copytree(algo_dir, build_dir)
 
+    assets_dir = "assets"
+
     hs = os.path.join(assets_dir, "crypto_aead.h")
     h = os.path.join(build_dir, "crypto_aead.h")
     shutil.copy(hs, h)
@@ -48,7 +54,7 @@ def bench(algo_dir):
         os.chdir(wd)
         # shutil.rmtree(build_dir)
 
-    exit(0)  # stop immediately for now
+    #exit(0)  # stop immediately for now
 
 
 
diff --git a/test.py b/test.py
index 2b6f373..8b3b59f 100755
--- a/test.py
+++ b/test.py
@@ -9,7 +9,7 @@ from subprocess import Popen, PIPE
 
 
 def main(argv):
-    p = Popen(["build/test"], bufsize=0, stdin=PIPE, stdout=PIPE)
+    p = Popen(argv[1:], bufsize=0, stdin=PIPE, stdout=PIPE)
 
     def write(data):
         l = p.stdin.write(data)