1 | #!/usr/bin/env bash
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2 | #
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3 | # Test awk vs Python speed.
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4 | #
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5 | # On this hash table benchmark, Python is maybe 10% slower than gawk. mawk is
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6 | # twice is fast as gawk (and bwk).
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7 | #
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8 | # Python has much more functionality, so it's not exactly a fair comparison,
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9 | # but it's instructive.
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10 | #
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11 | # Update: simply adding tolower() makes gawk much slower than Python (555 ms
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12 | # vs. 280 ms), and mawk is still much faster at 138 ms.
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13 | #
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14 | # Mawk is known to be fast? Faster than Java on this benchmark.
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15 | # https://brenocon.com/blog/2009/09/dont-mawk-awk-the-fastest-and-most-elegant-big-data-munging-language/
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16 | #
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17 | # Usage:
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18 | # ./awk-python.sh <function name>
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19 |
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20 | set -o nounset
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21 | set -o pipefail
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22 | set -o errexit
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23 |
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24 | readonly FILES=(../*.sh ../*/*.sh ../*.py ../*/*.py ../*/*/*.py)
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25 |
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26 | # Test out hash table implementations
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27 | # mawk is faster: 77ms vs 155ms for 10 iterations.
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28 | test-awk() {
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29 | for awk in gawk mawk ~/git/bwk/bwk; do
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30 | echo ---
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31 | echo $awk
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32 | echo ---
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33 | time for i in {1..10}; do
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34 | $awk '
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35 | {
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36 | line = tolower($0)
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37 | num_lines += 1
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38 |
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39 | # NOTE: gawk has length(); mawk does not
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40 | if (!(line in unique)) {
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41 | num_unique += 1
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42 | }
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43 | unique[line] += 1
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44 | }
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45 | END {
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46 | print "unique lines: " num_unique
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47 | print "total lines: " num_lines
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48 | }
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49 | ' "${FILES[@]}"
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50 |
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51 | done
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52 | done
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53 | }
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54 |
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55 | # Python VM is slower: 160-170 ms. Oops.
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56 | #
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57 | # Well Python has more general dictionaries -- they take more than strings.
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58 | test-python() {
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59 | time for i in {1..10}; do
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60 | python -S -c '
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61 | import collections
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62 | import sys
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63 |
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64 | num_lines = 0
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65 | num_unique = 0
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66 | unique = collections.defaultdict(int)
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67 |
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68 | for path in sys.argv[1:]:
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69 | with open(path) as f:
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70 | for line in f:
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71 | line = line.lower()
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72 | num_lines += 1
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73 |
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74 | if line not in unique:
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75 | num_unique += 1
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76 | unique[line] += 1
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77 |
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78 | print "unique lines: ", num_unique
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79 | print "total lines: ", num_lines
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80 | ' "${FILES[@]}"
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81 |
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82 | done
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83 | }
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84 |
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85 | # Only 10-30 ms. We are doing real work.
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86 | test-wc() {
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87 | time for i in {1..10}; do
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88 | cat "${FILES[@]}" | wc -c
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89 | done
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90 | }
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91 |
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92 | files() {
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93 | echo "${FILES[@]}"
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94 | echo "${#FILES[@]} files"
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95 | }
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96 |
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97 | "$@"
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