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https://github.com/VictoriaMetrics/VictoriaMetrics.git
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d120197676
Use standard copy() func instead of mmap-aware copy func for reading recently touched mmap-ed data. This improves read performance by up to 4x.
38 lines
812 B
Go
38 lines
812 B
Go
package fs
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import (
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"fmt"
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"io/ioutil"
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"testing"
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)
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func TestReaderAt(t *testing.T) {
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for _, bufSize := range []int{1, 1e1, 1e2, 1e3, 1e4, 1e5} {
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t.Run(fmt.Sprintf("%d", bufSize), func(t *testing.T) {
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testReaderAt(t, bufSize)
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})
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}
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}
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func testReaderAt(t *testing.T, bufSize int) {
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path := "TestReaderAt"
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const fileSize = 8 * 1024 * 1024
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data := make([]byte, fileSize)
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if err := ioutil.WriteFile(path, data, 0600); err != nil {
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t.Fatalf("cannot create %q: %s", path, err)
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}
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defer MustRemoveAll(path)
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r, err := OpenReaderAt(path)
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if err != nil {
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t.Fatalf("error in OpenReaderAt(%q): %s", path, err)
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}
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defer r.MustClose()
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buf := make([]byte, bufSize)
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for i := 0; i < fileSize-bufSize; i += bufSize {
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offset := int64(i)
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r.MustReadAt(buf[:0], offset)
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r.MustReadAt(buf, offset)
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}
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}
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