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Make backend benchmarks fairer by removing checks

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Checking whether the right data is returned takes up half the time in
some benchmarks. Results for local backend benchmarks on linux/amd64:

name                                      old time/op    new time/op    delta
Backend/BenchmarkLoadFile-8                 4.89ms ± 0%    2.72ms ± 1%   -44.26%  (p=0.008 n=5+5)
Backend/BenchmarkLoadPartialFile-8           936µs ± 6%     439µs ±15%   -53.07%  (p=0.008 n=5+5)
Backend/BenchmarkLoadPartialFileOffset-8     940µs ± 1%     456µs ±10%   -51.50%  (p=0.008 n=5+5)
Backend/BenchmarkSave-8                     23.9ms ±14%    24.8ms ±41%      ~     (p=0.690 n=5+5)

name                                      old speed      new speed      delta
Backend/BenchmarkLoadFile-8               3.43GB/s ± 0%  6.16GB/s ± 1%   +79.40%  (p=0.008 n=5+5)
Backend/BenchmarkLoadPartialFile-8        4.48GB/s ± 6%  9.63GB/s ±14%  +114.78%  (p=0.008 n=5+5)
Backend/BenchmarkLoadPartialFileOffset-8  4.46GB/s ± 1%  9.22GB/s ±10%  +106.74%  (p=0.008 n=5+5)
Backend/BenchmarkSave-8                    706MB/s ±13%   698MB/s ±31%      ~     (p=0.690 n=5+5)
This commit is contained in:
greatroar 2020-05-26 13:22:38 +02:00
parent 84475aa3a8
commit f4cd2a7120
1 changed files with 21 additions and 22 deletions
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43
internal/backend/test/benchmarks.go
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@ -48,17 +48,17 @@ func (s *Suite) BenchmarkLoadFile(t *testing.B) {
n, ierr = io.ReadFull(rd, buf) n, ierr = io.ReadFull(rd, buf)
return ierr return ierr
}) })
if err != nil {
t.StopTimer()
switch {
case err != nil:
t.Fatal(err) t.Fatal(err)
} case n != length:
if n != length {
t.Fatalf("wrong number of bytes read: want %v, got %v", length, n) t.Fatalf("wrong number of bytes read: want %v, got %v", length, n)
} case !bytes.Equal(data, buf):
if !bytes.Equal(data, buf) {
t.Fatalf("wrong bytes returned") t.Fatalf("wrong bytes returned")
} }
t.StartTimer()
} }
} }
@ -85,18 +85,17 @@ func (s *Suite) BenchmarkLoadPartialFile(t *testing.B) {
n, ierr = io.ReadFull(rd, buf) n, ierr = io.ReadFull(rd, buf)
return ierr return ierr
}) })
if err != nil {
t.StopTimer()
switch {
case err != nil:
t.Fatal(err) t.Fatal(err)
} case n != testLength:
if n != testLength {
t.Fatalf("wrong number of bytes read: want %v, got %v", testLength, n) t.Fatalf("wrong number of bytes read: want %v, got %v", testLength, n)
} case !bytes.Equal(data[:testLength], buf):
if !bytes.Equal(data[:testLength], buf) {
t.Fatalf("wrong bytes returned") t.Fatalf("wrong bytes returned")
} }
t.StartTimer()
} }
} }
@ -124,17 +123,17 @@ func (s *Suite) BenchmarkLoadPartialFileOffset(t *testing.B) {
n, ierr = io.ReadFull(rd, buf) n, ierr = io.ReadFull(rd, buf)
return ierr return ierr
}) })
if err != nil {
t.StopTimer()
switch {
case err != nil:
t.Fatal(err) t.Fatal(err)
} case n != testLength:
if n != testLength {
t.Fatalf("wrong number of bytes read: want %v, got %v", testLength, n) t.Fatalf("wrong number of bytes read: want %v, got %v", testLength, n)
} case !bytes.Equal(data[testOffset:testOffset+testLength], buf):
if !bytes.Equal(data[testOffset:testOffset+testLength], buf) {
t.Fatalf("wrong bytes returned") t.Fatalf("wrong bytes returned")
} }
t.StartTimer()
} }
} }