Nested Parallel For case

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace NestedForLoop
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
List<int> corrmask = new List<int>()
{
1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288
};
List<int> mskval = new List<int>()
{
1024, 1024, 1152, 1152, 1024
};
private void button1_Click(object sender, EventArgs e)
{
int[] arrCount = new int[25];
int[] arrCount_parallel = new int[25];
int[] arrCount_parallel_nest = new int[25];
int[] arrCount_asparallel = new int[25];
//Avoiding 2 for loops
for (int imk = 0; imk < corrmask.Count; imk++)
{
for (int mv = 0; mv < mskval.Count; mv++)
{
if ((mskval[mv] & corrmask[imk]) != 0)
{
arrCount[imk] = arrCount[imk] + 1;
}
}
}
List<int> result = arrCount.Where(x => x != 0).ToList();
//Case 2 - WORKS
//Parallel.For(0, corrmask.Count, imk =>
//{
// for (int mv = 0; mv < mskval.Count; mv++)
// {
// if ((mskval[mv] & corrmask[imk]) != 0)
// {
// arrCount_parallel[imk] = arrCount_parallel[imk] + 1;
// }
// }
//});
//List result_parallel = arrCount_parallel.Where(x => x != 0).ToList();
////Case 3 - WORKS
//Parallel.For(0, corrmask.Count, imk =>
//{
// Parallel.For(0, mskval.Count, mv =>
// {
// if ((mskval[mv] & corrmask[imk]) != 0)
// {
// arrCount_parallel_nest[imk] = arrCount_parallel_nest[imk] + 1;
// }
// });
//});
//List result_parallel_nest = arrCount_parallel_nest.Where(x => x != 0).ToList();
//case 4
Parallel.For(0, corrmask.Count, imk =>
{
mskval.AsParallel().ForAll(mv =>
{
if ((mskval[mv] & corrmask[imk]) != 0)
{
arrCount_asparallel[imk] = arrCount_asparallel[imk] + 1;
}
});
});
List<int> result_asparallel = arrCount_asparallel.Where(x => x != 0).ToList();
}
}
}

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Boomessh V6y ago
1. using System;
2. using System.Collections.Generic;
3. using System.Data;
4. using System.Linq;
5. using System.Threading.Tasks;
6. using System.Windows.Forms;
8. namespace NestedForLoop
9. {
10. public partial class Form1 : Form
11. {
12. public Form1()
13. {
14. InitializeComponent();
15. }
16. List<int> corrmask = new List<int>()
17. {
18. 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288
19. };
20. List<int> mskval = new List<int>()
21. {
22. 1024, 1024, 1152, 1152, 1024
23. };
25. private void button1_Click(object sender, EventArgs e)
26. {
27. int[] arrCount = new int[25];
28. int[] arrCount_parallel = new int[25];
29. int[] arrCount_parallel_nest = new int[25];
30. int[] arrCount_asparallel = new int[25];
32. //Avoiding 2 for loops
33. for (int imk = 0; imk < corrmask.Count; imk++)
34. {
35. for (int mv = 0; mv < mskval.Count; mv++)
36. {
37. if ((mskval[mv] & corrmask[imk]) != 0)
38. {
39. arrCount[imk] = arrCount[imk] + 1;
40. }
41. }
42. }
43. List<int> result = arrCount.Where(x => x != 0).ToList();
45. //Case 2 - WORKS
46. //Parallel.For(0, corrmask.Count, imk =>
47. //{
48. // for (int mv = 0; mv < mskval.Count; mv++)
49. // {
50. // if ((mskval[mv] & corrmask[imk]) != 0)
51. // {
52. // arrCount_parallel[imk] = arrCount_parallel[imk] + 1;
53. // }
54. // }
55. //});
56. //List result_parallel = arrCount_parallel.Where(x => x != 0).ToList();
58. ////Case 3 - WORKS
59. //Parallel.For(0, corrmask.Count, imk =>
60. //{
61. // Parallel.For(0, mskval.Count, mv =>
62. // {
63. // if ((mskval[mv] & corrmask[imk]) != 0)
64. // {
65. // arrCount_parallel_nest[imk] = arrCount_parallel_nest[imk] + 1;
66. // }
67. // });
68. //});
69. //List result_parallel_nest = arrCount_parallel_nest.Where(x => x != 0).ToList();
71. //case 4
72. Parallel.For(0, corrmask.Count, imk =>
73. {
74. mskval.AsParallel().ForAll(mv =>
75. {
76. if ((mskval[mv] & corrmask[imk]) != 0)
77. {
78. arrCount_asparallel[imk] = arrCount_asparallel[imk] + 1;
79. }
80. });
81. });
82. List<int> result_asparallel = arrCount_asparallel.Where(x => x != 0).ToList();
83. }
84. }
85. }
Adding the code instead of attachement...