gwj / po_oopc · Commits

Commit 1b0b1f672c309f4d54748c0f549b2e3236e9b1ad

Authored by Grzegorz Jabłoński
1 parent d4e88d17

Added parallel algorithm example

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Showing 7 changed files with 85 additions and 31 deletions
examples12/01-future/makefile deleted 100644 → 0
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1   -all: async1 async2 async3 promise
2   -
3   -async1: async1.o
4   - g++ -g -Wall -pedantic $^ -o $@ -lpthread
5   -
6   -async1.o: async1.cpp
7   - g++ -g -c -Wall -pedantic $< -o $@
8   -
9   -async2: async2.o
10   - g++ -g -Wall -pedantic $^ -o $@ -lpthread
11   -
12   -async2.o: async2.cpp
13   - g++ -g -c -Wall -pedantic $< -o $@
14   -
15   -async3: async3.o
16   - g++ -g -Wall -pedantic $^ -o $@ -lpthread
17   -
18   -async3.o: async3.cpp
19   - g++ -g -c -Wall -pedantic $< -o $@
20   -
21   -promise: promise.o
22   - g++ -g -Wall -pedantic $^ -o $@ -lpthread
23   -
24   -promise.o: promise.cpp
25   - g++ -g -c -Wall -pedantic $< -o $@
26   -
27   -
28   -.PHONY: clean
29   -
30   -clean:
31   - -rm async1.o async1 async2.o async2 async3.o async3 promise.o promise
32 0 \ No newline at end of file
examples12/01-future/async1.cpp renamed to examples12/01-threading/async1.cpp
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examples12/01-future/async2.cpp renamed to examples12/01-threading/async2.cpp
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examples12/01-future/async3.cpp renamed to examples12/01-threading/async3.cpp
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examples12/01-threading/makefile 0 → 100644
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  1 +all: async1 async2 async3 promise parallel_algorithm
  2 +
  3 +async1: async1.cpp
  4 + g++ -g -Wall -pedantic $< -o $@ -lpthread
  5 +
  6 +async2: async2.cpp
  7 + g++ -g -Wall -pedantic $< -o $@ -lpthread
  8 +
  9 +async3: async3.cpp
  10 + g++ -g -Wall -pedantic $< -o $@ -lpthread
  11 +
  12 +promise: promise.cpp
  13 + g++ -g -Wall -pedantic $^ -o $@ -lpthread
  14 +
  15 +parallel_algorithm: parallel_algorithm.cpp
  16 + g++ -std=c++17 -g -Wall -pedantic $< -o $@ -ltbb
  17 +
  18 +
  19 +.PHONY: clean
  20 +
  21 +clean:
  22 + -rm async1 async2 async3 promise parallel_algorithm
0 23 \ No newline at end of file
... ...
examples12/01-threading/parallel_algorithm.cpp 0 → 100644
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  1 +#include <stddef.h>
  2 +#include <stdio.h>
  3 +#include <algorithm>
  4 +#include <chrono>
  5 +#include <random>
  6 +#include <ratio>
  7 +#include <vector>
  8 +#include <execution>
  9 +
  10 +using std::chrono::duration;
  11 +using std::chrono::duration_cast;
  12 +using std::chrono::high_resolution_clock;
  13 +using std::milli;
  14 +using std::random_device;
  15 +using std::sort;
  16 +using std::vector;
  17 +
  18 +const size_t testSize = 1'000'000;
  19 +
  20 +const int iterationCount = 5;
  21 +
  22 +void print_results(const char *const tag, const vector<double>& sorted,
  23 + high_resolution_clock::time_point startTime,
  24 + high_resolution_clock::time_point endTime) {
  25 + printf("%s: Lowest: %g Highest: %g Time: %fms\n", tag, sorted.front(),
  26 + sorted.back(),
  27 + duration_cast<duration<double, milli>>(endTime - startTime).count());
  28 +}
  29 +
  30 +int main() {
  31 + random_device rd;
  32 +
  33 + // generate some random doubles:
  34 + printf("Testing with %zu doubles...\n", testSize);
  35 + vector<double> doubles(testSize);
  36 + for (auto& d : doubles) {
  37 + d = static_cast<double>(rd());
  38 + }
  39 +
  40 + // time how long it takes to sort them:
  41 + for (int i = 0; i < iterationCount; ++i)
  42 + {
  43 + vector<double> sorted(doubles);
  44 + const auto startTime = high_resolution_clock::now();
  45 + sort( sorted.begin(), sorted.end());
  46 + const auto endTime = high_resolution_clock::now();
  47 + print_results("Serial", sorted, startTime, endTime);
  48 + }
  49 +
  50 +
  51 + for (int i = 0; i < iterationCount; ++i)
  52 + {
  53 + vector<double> sorted(doubles);
  54 + const auto startTime = high_resolution_clock::now();
  55 + sort(std::execution::par_unseq, sorted.begin(), sorted.end());
  56 + const auto endTime = high_resolution_clock::now();
  57 + print_results("Parallel", sorted, startTime, endTime);
  58 + }
  59 +
  60 +
  61 +
  62 +}
  63 +
... ...
examples12/01-future/promise.cpp renamed to examples12/01-threading/promise.cpp
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