Add BER simulations

sweep_gr_sims.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+import subprocess
+import time
+import struct
+import math
+import statistics
+import tempfile
+import itertools
+from os import path
+
+import tqdm
+
+
+SIMS = [ 'dec_proto_am_ber_top.py',
+        'dec_proto_am_dc_ber_top.py',
+        'dec_proto_fm_ber_top.py',
+        ]
+E12_SERIES = [1.0, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9, 4.7, 5.6, 6.8, 8.2]
+AMPLITUDES_MILLIHERTZ = [ x*y for y in [1, 10, 100] for x in E12_SERIES ]
+
+SIMULATION_DURATION = 30.0 # seconds realtime
+MAX_CONCURRENT_PROCESSES = 8
+
+
+with tempfile.TemporaryDirectory() as tmpdir:
+
+    jobs = list(enumerate(itertools.product(SIMS, AMPLITUDES_MILLIHERTZ)))
+    print(f'Will launch {len(jobs)} simulation jobs in {math.ceil(len(jobs)/MAX_CONCURRENT_PROCESSES):.0f} batches of {MAX_CONCURRENT_PROCESSES}')
+
+    def start_processes(jobs):
+        for i, (sim, ampl_mhz) in jobs:
+                berfile = path.join(tmpdir, f'berfile_{i}')
+                proc = subprocess.Popen(['/usr/bin/python2', sim,
+                        '--signal-strength', str(ampl_mhz),
+                        '--ber-file', berfile],
+                    stdin=subprocess.PIPE, stdout=subprocess.DEVNULL)
+                yield proc, sim, ampl_mhz, berfile
+
+    results = { sim: ([], [], []) for sim in SIMS }
+    for n, i in enumerate(range(0, len(jobs), MAX_CONCURRENT_PROCESSES)):
+        batch = jobs[i:][:MAX_CONCURRENT_PROCESSES]
+        print(f'Starting batch {n}... ', end='')
+        processes = list(start_processes(batch))
+        print('done.')
+
+        print('Waiting for simulation:')
+        for _ in tqdm.trange(1000):
+            time.sleep(SIMULATION_DURATION/1000)
+
+        print('Terminating processes...', end='')
+        for proc, *_ in processes:
+            proc.communicate(b'\n', timeout=10)
+
+        for proc, *_ in processes:
+            proc.wait(5)
+        print('done.')
+
+        print('Processing simulation results')
+        for _proc, sim, ampl_mhz, berfile in processes:
+
+            with open(berfile, 'rb') as f:
+                data = f.read()
+
+            floats = struct.unpack(f'{len(data)//4}f', data)
+            ber = statistics.mean(floats[-256:])
+            stdev = statistics.stdev(floats[-256:])
+
+            amplitudes, bers, stdevs = results[sim]
+            amplitudes.append(ampl_mhz)
+            bers.append(ber)
+            stdevs.append(stdev)
+
+print(results)