forked from TrueCloudLab/restic
5d4568d393
This writes files by using (*os.File).Truncate, which resolves to the
truncate system call on Unix.
Compared to the naive loop,
for _, b := range p {
if b != 0 {
return false
}
}
the optimized allZero is about 10× faster:
name old time/op new time/op delta
AllZero-8 1.09ms ± 1% 0.09ms ± 1% -92.10% (p=0.000 n=10+10)
name old speed new speed delta
AllZero-8 3.84GB/s ± 1% 48.59GB/s ± 1% +1166.51% (p=0.000 n=10+10)
38 lines
819 B
Go
38 lines
819 B
Go
package restorer
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import (
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"io/ioutil"
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"testing"
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rtest "github.com/restic/restic/internal/test"
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)
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func TestFilesWriterBasic(t *testing.T) {
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dir, cleanup := rtest.TempDir(t)
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defer cleanup()
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w := newFilesWriter(1)
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f1 := dir + "/f1"
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f2 := dir + "/f2"
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rtest.OK(t, w.writeToFile(f1, []byte{1}, 0, 2))
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rtest.Equals(t, 0, len(w.buckets[0].files))
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rtest.OK(t, w.writeToFile(f2, []byte{2}, 0, 2))
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rtest.Equals(t, 0, len(w.buckets[0].files))
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rtest.OK(t, w.writeToFile(f1, []byte{1}, 1, -1))
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rtest.Equals(t, 0, len(w.buckets[0].files))
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rtest.OK(t, w.writeToFile(f2, []byte{2}, 1, -1))
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rtest.Equals(t, 0, len(w.buckets[0].files))
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buf, err := ioutil.ReadFile(f1)
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rtest.OK(t, err)
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rtest.Equals(t, []byte{1, 1}, buf)
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buf, err = ioutil.ReadFile(f2)
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rtest.OK(t, err)
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rtest.Equals(t, []byte{2, 2}, buf)
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}
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