Subprocess profiling

README.md

Table of contents

• Part I
• Part II - One-way
• Part III - Maxsize
• Part IV - Maxsize, bufsize

Usage

In Python 2 or 3 on any platform

$ python -u subprocess_profile.py --bytes=100 --iterations=1000

Results on Python 2.7 on play-with-docker:

$ docker run -ti --rm ubuntu
(ubuntu) $ apt-get update && apt-get install python
(ubuntu) $ python -u subprocess_profile.py --bytes=1 --iterations=10000
...
Iterations: 10,000
Bytes/iteration: 76 b/i
Bytes/second: 1,982,766 b/s
Avarage roundtrip time: 0.016 ms
Min roundtrip time: 0.002 ms
Max roundtrip time: 0.202 ms
Delta roundtrip time: 0.200 ms
Total bytes: 760,000 b
Total time: 0.383 s

Aggregate results

The second snippet runs the first many times, aggregating their results.

$ python subprocess_aggregate.py
...

10 minutes later

Producing a plot like aggplot.svg

aggplot.svg

plot.svg

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316.663211 566.414915 326.481239 568.126242 327.463446 569.837568 323.536641 571.548895 326.481239 573.260222 328.445654 574.971548 328.445654 576.682875 328.445654 578.394202 329.427862 580.105529 330.410070 581.816855 328.445654 583.528182 328.445654 585.239509 329.427862 586.950835 330.410070 588.662162 328.445654 590.373489 328.445654 592.084816 329.427862 593.796142 328.445654 595.507469 329.427862 597.218796 269.531414 598.930122 184.105665 600.641449 274.440428 602.352776 317.645419 604.064103 302.916353 605.775429 323.536641 607.486756 328.445654 609.198083 327.463446 610.909409 327.463446 612.620736 329.427862 614.332063 328.445654 616.043390 330.410070 617.754716 329.427862 619.466043 329.427862 621.177370 330.410070 622.888696 291.133910 624.600023 324.518848 626.311350 329.427862 628.022677 330.410070 629.734003 330.410070 631.445330 329.427862 633.156657 329.427862 634.867983 328.445654 636.579310 330.410070 638.290637 329.427862 640.001964 330.410070 641.713290 308.807574 643.424617 329.427862 645.135944 329.427862 646.847270 331.392278 648.558597 320.590017 650.269924 323.536641 651.981250 329.427862 653.692577 329.427862 655.403904 330.410070 657.115231 329.427862 658.826557 329.427862 660.537884 329.427862 662.249211 328.445654 663.960537 330.410070 665.671864 328.445654 667.383191 328.445654 669.094518 330.410070 670.805844 330.410070 672.517171 329.427862 674.228498 321.572225 675.939824 327.463446 677.651151 324.518848 679.362478 329.427862 681.073805 330.410070 682.785131 330.410070 684.496458 329.427862 686.207785 329.427862 687.919111 330.410070 689.630438 328.445654 691.341765 330.410070 693.053092 330.410070 694.764418 329.427862 696.475745 329.427862 698.187072 330.410070 699.898398 323.536641 701.609725 329.427862 703.321052 328.445654 705.032379 325.499031 706.743705 330.410070 708.455032 330.410070 710.166359 328.445654 711.877685 330.410070 713.589012 330.410070 715.300339 330.410070 717.011666 330.410070 718.722992 328.445654 720.434319 329.427862 722.145646 236.146476 723.856972 245.966529 725.568299 283.278273 727.279626 287.205079 728.990952 265.604608 730.702279 279.351467 732.413606 277.387051 734.124933 274.440428 735.836259 268.549207 737.547586 238.110892 739.258913 320.590017 740.970239 284.260481 742.681566 323.536641 744.392893 321.572225 746.104220 324.518848 747.815546 300.951937 749.526873 314.698796 751.238200 306.843159 752.949526 306.843159 754.660853 300.951937 756.372180 305.862976 758.083507 294.078508 759.794833 300.951937 761.506160 325.499031 763.217487 121.264620 764.928813 321.572225 766.640140 329.427862 768.351467 330.410070 770.062794 328.445654 771.774120 329.427862 773.485447 329.427862 775.196774 329.427862 776.908100 330.410070 778.619427 329.427862 780.330754 330.410070 782.042081 329.427862 783.753407 330.410070 785.464734 319.607809 787.176061 329.427862 788.887387 330.410070 790.598714 330.410070 792.310041 329.427862 794.021368 329.427862 795.732694 329.427862 797.444021 330.410070 799.155348 330.410070 800.866674 330.410070 802.578001 330.410070 804.289328 328.445654 806.000655 329.427862 807.711981 330.410070 809.423308 330.410070 811.134635 330.410070 812.845961 324.518848 814.557288 330.410070 816.268615 329.427862 817.979941 330.410070 819.691268 330.410070 821.402595 330.410070 823.113922 329.427862 824.825248 330.410070 826.536575 317.645419 828.247902 329.427862 829.959228 329.427862 831.670555 330.410070 833.381882 329.427862 835.093209 331.392278 836.804535 330.410070 838.515862 329.427862 840.227189 324.518848 841.938515 328.445654 843.649842 329.427862 845.361169 329.427862 847.072496 329.427862 848.783822 329.427862 850.495149 330.410070 852.206476 330.410070 853.917802 330.410070 855.629129 331.392278 857.340456 330.410070 859.051783 330.410070 860.763109 330.410070 862.474436 331.392278 864.185763 329.427862 865.897089 330.410070 867.608416 324.518848 869.319743 329.427862 871.031070 329.427862 872.742396 330.410070 874.453723 329.427862 876.165050 279.351467 877.876376 330.410070 879.587703 329.427862 881.299030 330.410070 883.010357 329.427862 884.721683 330.410070 886.433010 330.410070 888.144337 327.463446 889.855663 328.445654 891.566990 330.410070 893.278317 330.410070 894.989643 326.481239 896.700970 330.410070 898.412297 331.392278 900.123624 328.445654 901.834950 330.410070 903.546277 330.410070 905.257604 329.427862 906.968930 330.410070 908.680257 330.410070 910.391584 329.427862 912.102911 330.410070 913.814237 329.427862 915.525564 330.410070 917.236891 328.445654 918.948217 330.410070 920.659544 329.427862 922.370871 325.499031 924.082198 329.427862 925.793524 328.445654 927.504851 330.410070 929.216178 329.427862 930.927504 330.410070 932.638831 329.427862 934.350158 329.427862 936.061485 322.554433 937.772811 330.410070 939.484138 330.410070 941.195465 329.427862 942.906791 330.410070 944.618118 330.410070 946.329445 329.427862 948.040772 323.536641 949.752098 325.499031 951.463425 330.410070 953.174752 328.445654 954.886078 331.392278 956.597405 330.410070 958.308732 330.410070 960.020059 330.410070 961.731385 330.410070 963.442712 329.427862 965.154039 330.410070 966.865365 183.123458 968.576692 265.604608 970.288019 307.825367 971.999345 324.518848 973.710672 327.463446 975.421999 330.410070 977.133326 323.536641 978.844652 328.445654 980.555979 330.410070 982.267306 328.445654 983.978632 329.427862 985.689959 329.427862 987.401286 329.427862 989.112613 330.410070 990.823939 329.427862 992.535266 329.427862 994.246593 328.445654 995.957919 330.410070 997.669246 328.445654 999.380573 330.410070 1001.091900 328.445654 1002.803226 330.410070 1004.514553 324.518848 1006.225880 330.410070 1007.937206 329.427862 1009.648533 328.445654 1011.359860 329.427862 1013.071187 330.410070 1014.782513 329.427862 1016.493840 328.445654 1018.205167 328.445654 1019.916493 321.572225 1021.627820 329.427862 1023.339147 329.427862 1025.050474 328.445654 1026.761800 329.427862 1028.473127 329.427862 1030.184454 329.427862 1031.895780 323.536641 1033.607107 330.410070 1035.318434 330.410070 1037.029761 329.427862 1038.741087 329.427862 1040.452414 329.427862 1042.163741 329.427862 1043.875067 329.427862 1045.586394 329.427862 1047.297721 330.410070 1049.009048 329.427862 1050.720374 330.410070 1052.431701 329.427862 1054.143028 329.427862 1055.854354 329.427862 1057.565681 328.445654 1059.277008 317.645419 1060.988334 330.410070 1062.699661 329.427862 1064.410988 329.427862 1066.122315 330.410070 1067.833641 329.427862 1069.544968 329.427862 1071.256295 330.410070 1072.967621 328.445654 1074.678948 329.427862 1076.390275 329.427862 1078.101602 330.410070 1079.812928 330.410070 1081.524255 330.410070 1083.235582 330.410070 1084.946908 328.445654 1086.658235 323.536641 1088.369562 330.410070 1090.080889 330.410070 1091.792215 322.554433 1093.503542 327.463446 1095.214869 328.445654 1096.926195 330.410070 1098.637522 329.427862 1100.348849 328.445654 1102.060176 329.427862 1103.771502 330.410070 1105.482829 329.427862 1107.194156 329.427862 1108.905482 330.410070 1110.616809 329.427862 1112.328136 329.427862 1114.039463 323.536641 1115.750789 329.427862 1117.462116 330.410070 1119.173443 329.427862 1120.884769 329.427862 1122.596096 329.427862 1124.307423 329.427862 1126.018750 328.445654 1127.730076 329.427862 1129.441403 205.708161 1131.152730 268.549207 1132.864056 258.731179 1134.575383 265.604608 1136.286710 305.862976 1137.998036 324.518848 1139.709363 325.499031 1141.420690 322.554433 1143.132017 329.427862 1144.843343 329.427862 1146.554670 330.410070 1148.265997 329.427862 1149.977323 328.445654 1151.688650 329.427862 1153.399977 329.427862 1155.111304 330.410070 1156.822630 329.427862 1158.533957 329.427862 1160.245284 330.410070 1161.956610 329.427862 1163.667937 312.734380 1165.379264 327.463446 1167.090591 330.410070 1168.801917 324.518848 1170.513244 329.427862 1172.224571 329.427862 1173.935897 330.410070 1175.647224 329.427862 1177.358551 330.410070 1179.069878 330.410070 1180.781204 329.427862 1182.492531 328.445654 1184.203858 329.427862 1185.915184 329.427862 1187.626511 329.427862 1189.337838 322.554433 1191.049165 330.410070 1192.760491 330.410070 1194.471818 330.410070 1196.183145 325.499031 1197.894471 323.536641 1199.605798 329.427862 1201.317125 329.427862 1203.028452 327.463446 1204.739778 329.427862 1206.451105 330.410070 1208.162432 329.427862 1209.873758 329.427862 1211.585085 330.410070 1213.296412 329.427862 1215.007739 324.518848 1216.719065 330.410070 1218.430392 328.445654 1220.141719 328.445654 1221.853045 331.392278 1223.564372 324.518848 1225.275699 330.410070 1226.987025 328.445654 1228.698352 330.410070 1230.409679 328.445654 1232.121006 329.427862 1233.832332 329.427862 1235.543659 322.554433 1237.254986 329.427862 1238.966312 328.445654 1240.677639 322.554433 1242.388966 329.427862 1244.100293 330.410070 1245.811619 328.445654 1247.522946 328.445654 1249.234273 329.427862 1250.945599 324.518848 1252.656926 329.427862 1254.368253 329.427862 1256.079580 330.410070 1257.790906 328.445654 1259.502233 329.427862 1261.213560 329.427862 1262.924886 329.427862 1264.636213 330.410070 1266.347540 323.536641 1268.058867 330.410070 1269.770193 330.410070 1271.481520 329.427862 1273.192847 329.427862 1274.904173 330.410070 1276.615500 329.427862 1278.326827 324.518848 1280.038154 329.427862 1281.749480 329.427862 1283.460807 330.410070 1285.172134 329.427862 1286.883460 329.427862 1288.594787 328.445654 1290.306114 329.427862 1292.017441 323.536641 1293.728767 330.410070 1295.440094 330.410070 1297.151421 329.427862 1298.862747 330.410070 1300.574074 330.410070 1302.285401 329.427862 1303.996727 329.427862 1305.708054 325.499031 1307.419381 321.572225 1309.130708 329.427862 1310.842034 329.427862 1312.553361 329.427862 1314.264688 329.427862 1315.976014 329.427862 1317.687341 324.518848 1319.398668 328.445654 1321.109995 329.427862 1322.821321 330.410070 1324.532648 330.410070 1326.243975 328.445654 1327.955301 330.410070 1329.666628 328.445654 1331.377955 329.427862 1333.089282 324.518848 1334.800608 329.427862 1336.511935 330.410070 1338.223262 330.410070 1339.934588 328.445654 1341.645915 330.410070 1343.357242 323.536641 1345.068569 329.427862 1346.779895 328.445654 1348.491222 328.445654 1350.202549 330.410070 1351.913875 330.410070 1353.625202 330.410070 1355.336529 307.825367 1357.047856 327.463446 1358.759182 330.410070 1360.470509 322.554433 1362.181836 330.410070 1363.893162 329.427862 1365.604489 329.427862 1367.315816 329.427862 1369.027143 244.002113 1370.738469 215.526188 1372.449796 309.789782 1374.161123 324.518848 1375.872449 327.463446 1377.583776 329.427862 1379.295103 319.607809 1381.006430 329.427862 1382.717756 328.445654 1384.429083 329.427862 1386.140410 329.427862 1387.851736 323.536641 1389.563063 330.410070 1391.274390 330.410070 1392.985716 322.554433 1394.697043 328.445654 1396.408370 330.410070 1398.119697 330.410070 1399.831023 329.427862 1401.542350 328.445654 1403.253677 329.427862 1404.965003 329.427862 1406.676330 329.427862 1408.387657 329.427862 1410.098984 329.427862 1411.810310 330.410070 1413.521637 329.427862 1415.232964 325.499031 1416.944290 329.427862 1418.655617 323.536641 1420.366944 329.427862 1422.078271 329.427862 1423.789597 330.410070 1425.500924 329.427862 1427.212251 329.427862 1428.923577 330.410070 1430.634904 328.445654 1432.346231 329.427862 1434.057558 330.410070 1435.768884 330.410070 1437.480211 329.427862 1439.191538 329.427862 1440.902864 330.410070 1442.614191 324.518848 1444.325518 321.572225 1446.036845 330.410070 1447.748171 330.410070 1449.459498 330.410070 1451.170825 322.554433 1452.882151 329.427862 1454.593478 330.410070 1456.304805 330.410070 1458.016132 330.410070 1459.727458 330.410070 1461.438785 330.410070 1463.150112 329.427862 1464.861438 328.445654 1466.572765 330.410070 1468.284092 329.427862 1469.995418 319.607809 1471.706745 329.427862 1473.418072 329.427862 1475.129399 329.427862 1476.840725 329.427862 1478.552052 329.427862 1480.263379 330.410070 1481.974705 329.427862 1483.686032 329.427862 1485.397359 329.427862 1487.108686 331.392278 1488.820012 330.410070 1490.531339 330.410070 1492.242666 329.427862 1493.953992 328.445654 1495.665319 322.554433 1497.376646 324.518848 1499.087973 330.410070 1500.799299 330.410070 1502.510626 330.410070 1504.221953 329.427862 1505.933279 330.410070 1507.644606 329.427862 1509.355933 330.410070 1511.067260 329.427862 1512.778586 330.410070 1514.489913 331.392278 1516.201240 330.410070 1517.912566 329.427862 1519.623893 330.410070 1521.335220 323.536641 1523.046547 323.536641 1524.757873 324.518848 1526.469200 329.427862 1528.180527 330.410070 1529.891853 330.410070 1531.603180 306.843159 1533.314507 329.427862 1535.025834 330.410070 1536.737160 329.427862 1538.448487 330.410070 1540.159814 330.410070 1541.871140 329.427862 1543.582467 330.410070 1545.293794 330.410070 1547.005121 209.634967 1548.716447 275.422636 1550.427774 222.399618 1552.139101 318.627627 1553.850427 325.499031 1555.561754 327.463446 1557.273081 328.445654 1558.984407 328.445654 1560.695734 326.481239 1562.407061 327.463446 1564.118388 328.445654 1565.829714 329.427862 1567.541041 329.427862 1569.252368 328.445654 1570.963694 328.445654 1572.675021 329.427862 1574.386348 328.445654 1576.097675 328.445654 1577.809001 323.536641 1579.520328 329.427862 1581.231655 328.445654 1582.942981 329.427862 1584.654308 328.445654 1586.365635 327.463446 1588.076962 329.427862 1589.788288 328.445654 1591.499615 328.445654 1593.210942 325.499031 1594.922268 321.572225 1596.633595 328.445654 1598.344922 329.427862 1600.056249 329.427862 1601.767575 330.410070 1603.478902 329.427862 1605.190229 323.536641 1606.901555 329.427862 1608.612882 329.427862 1610.324209 329.427862 1612.035536 329.427862 1613.746862 329.427862 1615.458189 329.427862 1617.169516 329.427862 1618.880842 321.572225 1620.592169 326.481239 1622.303496 327.463446 1624.014823 328.445654 1625.726149 329.427862 1627.437476 328.445654 1629.148803 329.427862 1630.860129 329.427862 1632.571456 324.518848 1634.282783 329.427862 1635.994109 329.427862 1637.705436 329.427862 1639.416763 329.427862 1641.128090 330.410070 1642.839416 329.427862 1644.550743 325.499031 1646.262070 329.427862 1647.973396 329.427862 1649.684723 329.427862 1651.396050 328.445654 1653.107377 329.427862 1654.818703 328.445654 1656.530030 329.427862 1658.241357 329.427862 1659.952683 324.518848 1661.664010 328.445654 1663.375337 328.445654 1665.086664 329.427862 1666.797990 324.518848 1668.509317 329.427862 1670.220644 322.554433 1671.931970 326.481239 1673.643297 330.410070 1675.354624 329.427862 1677.065951 329.427862 1678.777277 328.445654 1680.488604 330.410070 1682.199931 330.410070 1683.911257 328.445654 1685.622584 329.427862 1687.333911 324.518848 1689.045238 329.427862 1690.756564 329.427862 1692.467891 329.427862 1694.179218 328.445654 1695.890544 325.499031 1697.601871 330.410070 1699.313198 330.410070 1701.024525 329.427862 1702.735851 330.410070 1704.447178 328.445654 1706.158505 329.427862 1707.869831 329.427862 1709.581158 329.427862 1711.292485 330.410070 1713.003812 329.427862 1714.715138 325.499031 1716.426465 330.410070 1718.137792 330.410070 1719.849118 329.427862 1721.560445 324.518848 1723.271772 325.499031 1724.983098 330.410070 1726.694425 330.410070 1728.405752 329.427862 1730.117079 306.843159 1731.828405 328.445654 1733.539732 329.427862 1735.251059 328.445654 1736.962385 330.410070 1738.673712 323.536641 1740.385039 330.410070 1742.096366 325.499031 1743.807692 328.445654" /></g></g><g class="titles"><text class="title plot_title" x="1000.0" y="26">Time per iteration</text></g><g class="plot overlay" transform="translate(202, 46)"><g class="series serie-0 color-0" /><g class="series serie-1 color-1" /><g class="series serie-2 color-2" /></g><g class="plot text-overlay" transform="translate(202, 46)"><g class="series serie-0 color-0" /><g class="series serie-1 color-1" /><g class="series serie-2 color-2" /></g><g class="plot tooltip-overlay" transform="translate(202, 46)"><g class="tooltip" style="opacity: 0" transform="translate(0 0)"><rect class="tooltip-box" height="0" rx="0" ry="0" width="0" /><g class="text" /></g></g><g class="legends" transform="translate(10, 56)"><g class="legend reactive activate-serie" id="activate-serie-0"><rect class="color-0 reactive" height="12" width="12" x="0.0" y="1.0" /><text x="17.0" y="11.2">Roundtrip (ms)</text></g><g class="legend reactive activate-serie" id="activate-serie-1"><rect class="color-1 reactive" height="12" width="12" x="0.0" y="22.0" /><text x="17.0" y="32.2">Write to child…</text><title>Write to child (ms)</title></g><g class="legend reactive activate-serie" id="activate-serie-2"><rect class="color-2 reactive" height="12" width="12" x="0.0" y="43.0" /><text x="17.0" y="53.2">Child wait (ms)</text></g></g><g class="legends" transform="translate(1990, 56)" /></g></svg>

subprocess_aggregate.py

"""Aggregate STDIO results"""

import os
import sys
import json
import pygal
import subprocess
from collections import defaultdict

dp0 = os.path.dirname(__file__)
fname = os.path.join(dp0, "subprocess_profile.py")
oname = os.path.join(dp0, "output.json")
pname = os.path.join(dp0, "aggplot.svg")
rname = os.path.join(dp0, "results.json")


def run(sizes):
    data = dict()

    for size in sizes:
        if size != 1 and size % 100 != 0:
            continue

        print("bytes: %d" % size)
        subprocess.call([
            sys.executable,
            "stdio_cli.py",
            "--iterations", str(10000),
            "--bytes", str(size),
            "--output", oname,
        ])

        with open(oname) as f:
            results = json.load(f)

        data[str(size)] = results

    print("Writing data to '%s'" % rname)
    with open(rname, "w") as f:
        json.dump(data, f, indent=2)


if not os.path.exists(rname):
    run(sizes=range(1, 10000 + 1))

with open(rname) as f:
    data = json.load(f)

sizes = list()
times = defaultdict(list)

for size, result in data.items():
    sizes.append(size)
    for key, value in result.items():

        if key in ("mintime", "avgtime"):
            value *= 1000  # microseconds
            key += " (mu)"

        if key == "bps":
            value /= 10 ** 6
            key = "mbps"

        times[key].append(value)


print("Plotting to %s.." % pname)
plot = pygal.Line(width=2000, height=500)
plot.title = "Time relative size"

for key, values in times.items():
    if key in ("iterations", "totb", "bpi",
               "maxtime", "deltime", "totdur"):
        continue
    plot.add(key, values, show_dots=False)

plot.x_labels = sizes
plot.render_to_file(pname)

subprocess_profile.py

"""Subprocess IPC communication test

Determine the throughput and bandwidth of standard Python
subprocess interprocess communication.

"""

import os
import sys
import time
import pstats
import logging
import cProfile
import argparse
import subprocess

logging.basicConfig(format="%(name)s: %(message)s")
parser = argparse.ArgumentParser()
parser.add_argument("-o", "--output")
parser.add_argument("-i", "--iterations", default=100, type=int)
parser.add_argument("-b", "--bytes", default=1000, type=int)
parser.add_argument("-s", "--stats", action="store_true",
                    help="Print additional stats")
parser.add_argument("-p", "--plot", action="store_true")
parser.add_argument("-q", "--quiet", action="store_true")
opt = parser.parse_args()

if not os.getenv("CHILD"):
    # Parent Process
    #
    # This block boots up another Python interpreter
    # so as to send messages back and forth.
    #  ______________
    # |              |
    # |              |
    # |    PARENT    |
    # |              |
    # |______________|
    #
    log = logging.getLogger("<-- PY")
    log.setLevel(logging.INFO)

    log.info("Booting child..")
    popen = subprocess.Popen(

        # Open yourself, but run the below block
        [sys.executable, __file__],

        env=dict(os.environ, **{"CHILD": "1"}),
        stdin=subprocess.PIPE,
        stdout=subprocess.PIPE,
        bufsize=-1,
        universal_newlines=True,
    )

    # Wait for child to get ready..
    response = popen.stdout.readline()
    assert response == "Ready\n", "Was: '%s'" % response

    # Data the size of opt.bytes
    data = "0".zfill(opt.bytes)
    bytes_ = sys.getsizeof(data)
    log.info("Created data {:,} bytes (len {})".format(
        bytes_, len(data)
    ))

    write_per_iteration = list()
    rtrip_per_iteration = list()  # roundtrip
    child_wait_times = list()
    times = list()

    if opt.stats:
        profile = cProfile.Profile()
        profile.enable()

    tot0 = time.clock()
    for i in range(opt.iterations):

        # Write
        write0 = time.clock()
        popen.stdin.write(data)
        popen.stdin.write("%d\n" % i)
        popen.stdin.flush()
        write1 = time.clock()

        # Read
        read0 = time.clock()
        response = popen.stdout.readline()
        read1 = time.clock()

        write_per_iteration.append((write1 - write0) * 1000)
        rtrip_per_iteration.append((read1 - read0) * 1000)
        times.append(read1)

        index, wait = response.rsplit("-", 1)
        response = int(index)
        wait = float(wait)
        child_wait_times.append(wait)
        assert response == i, "Was %d, expected %d" % (response, i)

        if not opt.quiet and (opt.iterations > 1000 and i % 100 == 0):
            sys.stderr.write("\r%d/%d.." % (i, opt.iterations))
    if not opt.quiet:
        sys.stderr.write("\r%d/%d..\n" % (opt.iterations, opt.iterations))

    if opt.stats:
        profile.disable()
        stats = pstats.Stats(profile).sort_stats("time")
        stats.print_stats(20)

    tot1 = time.clock()
    totdur = tot1 - tot0  # s

    # Send kill signal
    popen.kill()
    popen.wait()

    def plot():
        import pygal
        fname = os.path.join(os.getcwd(), "plot.svg")
        log.info("Plotting to %s.." % fname)
        assert rtrip_per_iteration
        assert write_per_iteration
        assert child_wait_times

        plot = pygal.Line(width=2000, height=500)
        plot.title = "Time per iteration"
        plot.add("Roundtrip (ms)", rtrip_per_iteration, show_dots=False)
        plot.add("Write to child (ms)", write_per_iteration, show_dots=False)
        plot.add("Child wait (ms)", child_wait_times, show_dots=False)
        # plot.x_labels = times
        plot.render_to_file(fname)

    if opt.plot:
        try:
            plot()
        except ImportError:
            log.info("Plotting skipped, could not find pygal")

    iterations = opt.iterations
    bpi = bytes_ * 2
    totb = opt.iterations * bpi  # in + out
    bps = totb / (totdur)
    avgtime = (sum(rtrip_per_iteration) / len(rtrip_per_iteration))
    mintime = min(rtrip_per_iteration)
    maxtime = max(rtrip_per_iteration)
    deltime = maxtime - mintime

    results = (
        ("iterations", opt.iterations),
        ("bpi", bytes_ * 2),
        ("bps", bps),
        ("avgtime", avgtime),
        ("mintime", mintime),
        ("maxtime", maxtime),
        ("deltime", deltime),
        ("totb", totb),
        ("totdur", totdur),
    )

    if opt.output:
        import json
        with open(opt.output, "w") as f:
            log.info("Writing results to '%s'" % opt.output)
            json.dump(dict(results), f, indent=2, sort_keys=True)

    print("""\
Iterations: {iterations:,}
Bytes/iteration: {bpi:,} b/i
Bytes/second: {bps:,.0f} b/s
Avarage roundtrip time: {avgtime:.3f} ms
Min roundtrip time: {mintime:.3f} ms
Max roundtrip time: {maxtime:.3f} ms
Delta roundtrip time: {deltime:.3f} ms
Total bytes: {totb:,} b
Total time: {totdur:.3f} s
""".format(**locals()))

else:
    # Child Process
    #
    # This block represents the additional Python interpreter which
    # is receiving messages via sys.stdin from the above parent.
    #  _____________
    # |             |
    # |             |
    # |    CHILD    |
    # |             |
    # |_____________|
    #
    log = logging.getLogger("--> MO")
    log.setLevel(logging.INFO)

    log.info("Ready for action..")
    sys.stdout.write("Ready\n")
    sys.stdout.flush()

    t0 = None
    while True:
        line = sys.stdin.readline().rstrip()

        # Wait time
        t1 = time.clock()
        duration = "-%.6f\n" % ((t1 - (t0 or t1)) * 1000)
        sys.stdout.write(line)
        sys.stdout.write(duration)
        sys.stdout.flush()
        t0 = time.clock()

    log.info("Dying..")