--- a/sim.py	Sun Nov 19 17:36:45 2023 +1030
+++ b/sim.py	Sun Nov 19 17:59:58 2023 +1030
@@ -29,15 +29,14 @@
     cmd.extend(simflags)
     cmd.append(runname.name)
     then = datetime.datetime.now()
-    print(f'Starting run {runname} at {then}')
+    #print(f'Starting run {runname} at {then}')
     p = subprocess.Popen(cmd, cwd = rundir)
     p.communicate()
     now = datetime.datetime.now()
     taken = now - then
 
     if p.returncode != 0:
-        print('Run failed: ' + ' '.join(map(shlex.quote, cmd)))
-        return 100000
+        raise Exception(' '.join(map(shlex.quote, cmd)) + ' failed with code ' + str(p.returncode))
 
     #rawpath = rundir / runname.with_suffix('.raw')
     #raw = spicelib.RawRead(rawpath)
@@ -110,8 +109,11 @@
     # Run the simulation
     # Need to convert units to suit
     runname = pathlib.Path(circ).stem + '-' + str(run) + '.net'
-    then, taken, power, eff, thd, ipeak = simulate(circ, simexe, simflags, rundir, runname,
-                                                   {'dutypct' : duty, 'C1' : c1 * 1e-12, 'C2' : c2 * 1e-12, 'L1' : l1 * 1e-6, 'L2' : l2 * 1e-9})
+    try:
+        then, taken, power, eff, thd, ipeak = simulate(circ, simexe, simflags, rundir, runname,
+                                                       {'dutypct' : duty, 'C1' : c1 * 1e-12, 'C2' : c2 * 1e-12, 'L1' : l1 * 1e-6, 'L2' : l2 * 1e-9})
+    except:
+        return 100000
     # Calculate the cost
     cost = calccost(power, eff, thd, ipeak)