use cpp random particles for scaling test

also fix template parameters

cpp/particles/particles_system_builder.hpp

@@ -40,7 +40,7 @@
 #include "kspace.hpp"
 
 const int MAX_INTERPOLATION_NEIGHBOURS=5;
-const int MAX_INTERPOLATION_SMOOTHNESS=2;
+const int MAX_INTERPOLATION_SMOOTHNESS=3;
 
 //////////////////////////////////////////////////////////////////////////////
 ///

tests/DNS/test_scaling.py

@@ -57,6 +57,7 @@ def get_DNS_parameters(
         DNS_parameters += [
                 '--precision', 'double']
     # check that source sim exists
+    print('looking for ', os.path.join(src_dirname, src_simname + '.h5'))
     assert(os.path.exists(os.path.join(src_dirname, src_simname + '.h5')))
     # check that source checkpoint exists
     dns_src = TurTLE.DNS(simname = src_simname, work_dir = src_dirname)
@@ -87,7 +88,7 @@ def get_DNS_parameters(
         DNS_parameters += [
                 '--tracers0_neighbours', '{0}'.format(nneighbours),
                 '--tracers0_smoothness', '{0}'.format(smoothness),
-                '--particle-rand-seed', '2']
+                '--cpp_random_particles', '2']
     if no_submit:
         DNS_parameters += ['--no-submit']
     DNS_parameters += ['--environment', environment,