github.com/parquet-go/parquet-go@v0.20.0/internal/bytealg/broadcast_test.go (about)

     1  package bytealg_test
     2  
     3  import (
     4  	"fmt"
     5  	"testing"
     6  
     7  	"github.com/parquet-go/parquet-go/internal/bytealg"
     8  )
     9  
    10  func TestBroadcast(t *testing.T) {
    11  	const N = 100_0000
    12  	buffer := make([]byte, N)
    13  
    14  	for n := 1; n <= N; n = (n * 2) + 1 {
    15  		t.Run(fmt.Sprintf("size=%d", n), func(t *testing.T) {
    16  			b := buffer[:n]
    17  
    18  			for i := range b {
    19  				b[i] = 0
    20  			}
    21  
    22  			bytealg.Broadcast(b, 42)
    23  
    24  			for i, c := range b {
    25  				if c != 42 {
    26  					t.Fatalf("byte at index %d has value %d", i, c)
    27  				}
    28  			}
    29  		})
    30  	}
    31  }
    32  
    33  func BenchmarkBroadcast(b *testing.B) {
    34  	for _, size := range []int{0, 10, 100, 1000, 10_000} {
    35  		b.Run(fmt.Sprintf("size=%d", size), func(b *testing.B) {
    36  			data := make([]byte, size)
    37  
    38  			for i := 0; i < b.N; i++ {
    39  				bytealg.Broadcast(data, 1)
    40  			}
    41  
    42  			b.SetBytes(int64(size))
    43  		})
    44  	}
    45  }