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Reduced the number of steps per decimal exponent from 5 to 2, since 5 is too big for the majority of cases

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This commit is contained in:
Aliaksandr Valialkin 2019-11-25 15:19:31 +02:00
parent 3306660b50
commit 674ca26d5f
2 changed files with 7 additions and 7 deletions
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2
histogram.go
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@ -11,7 +11,7 @@ import (
const (
e10Min = -9
e10Max = 18
decimalMultiplier = 5
decimalMultiplier = 2
bucketSize = 9 * decimalMultiplier
bucketsCount = e10Max - e10Min
decimalPrecision = 0.01 / decimalMultiplier

12
histogram_test.go
View File

@ -99,8 +99,8 @@ func TestHistogramSerial(t *testing.T) {
}
// Make sure the histogram prints <prefix>_xbucket on marshalTo call
testMarshalTo(t, h, "prefix", "prefix_bucket{vmrange=\"9.6e1...9.8e1\"} 1\nprefix_bucket{vmrange=\"9.8e1...1.0e2\"} 2\nprefix_bucket{vmrange=\"1.0e2...1.2e2\"} 20\nprefix_bucket{vmrange=\"1.2e2...1.4e2\"} 20\nprefix_bucket{vmrange=\"1.4e2...1.6e2\"} 20\nprefix_bucket{vmrange=\"1.6e2...1.8e2\"} 20\nprefix_bucket{vmrange=\"1.8e2...2.0e2\"} 20\nprefix_bucket{vmrange=\"2.0e2...2.2e2\"} 17\nprefix_sum 18900\nprefix_count 120\n")
testMarshalTo(t, h, ` m{foo="bar"}`, "\t m_bucket{foo=\"bar\",vmrange=\"9.6e1...9.8e1\"} 1\n\t m_bucket{foo=\"bar\",vmrange=\"9.8e1...1.0e2\"} 2\n\t m_bucket{foo=\"bar\",vmrange=\"1.0e2...1.2e2\"} 20\n\t m_bucket{foo=\"bar\",vmrange=\"1.2e2...1.4e2\"} 20\n\t m_bucket{foo=\"bar\",vmrange=\"1.4e2...1.6e2\"} 20\n\t m_bucket{foo=\"bar\",vmrange=\"1.6e2...1.8e2\"} 20\n\t m_bucket{foo=\"bar\",vmrange=\"1.8e2...2.0e2\"} 20\n\t m_bucket{foo=\"bar\",vmrange=\"2.0e2...2.2e2\"} 17\n\t m_sum{foo=\"bar\"} 18900\n\t m_count{foo=\"bar\"} 120\n")
testMarshalTo(t, h, "prefix", "prefix_bucket{vmrange=\"9.5e1...1.0e2\"} 3\nprefix_bucket{vmrange=\"1.0e2...1.5e2\"} 50\nprefix_bucket{vmrange=\"1.5e2...2.0e2\"} 50\nprefix_bucket{vmrange=\"2.0e2...2.5e2\"} 17\nprefix_sum 18900\nprefix_count 120\n")
testMarshalTo(t, h, ` m{foo="bar"}`, "\t m_bucket{foo=\"bar\",vmrange=\"9.5e1...1.0e2\"} 3\n\t m_bucket{foo=\"bar\",vmrange=\"1.0e2...1.5e2\"} 50\n\t m_bucket{foo=\"bar\",vmrange=\"1.5e2...2.0e2\"} 50\n\t m_bucket{foo=\"bar\",vmrange=\"2.0e2...2.5e2\"} 17\n\t m_sum{foo=\"bar\"} 18900\n\t m_count{foo=\"bar\"} 120\n")
// Verify Reset
h.Reset()
@ -154,7 +154,7 @@ func TestHistogramConcurrent(t *testing.T) {
if err != nil {
t.Fatal(err)
}
testMarshalTo(t, h, "prefix", "prefix_bucket{vmrange=\"5.8e-1...6.0e-1\"} 5\nprefix_bucket{vmrange=\"6.8e-1...7.0e-1\"} 5\nprefix_bucket{vmrange=\"7.8e-1...8.0e-1\"} 5\nprefix_bucket{vmrange=\"8.8e-1...9.0e-1\"} 5\nprefix_bucket{vmrange=\"9.8e-1...1.0e0\"} 5\nprefix_bucket{vmrange=\"1.0e0...1.2e0\"} 10\nprefix_bucket{vmrange=\"1.2e0...1.4e0\"} 5\nprefix_sum 38\nprefix_count 40\n")
testMarshalTo(t, h, "prefix", "prefix_bucket{vmrange=\"5.5e-1...6.0e-1\"} 5\nprefix_bucket{vmrange=\"6.5e-1...7.0e-1\"} 5\nprefix_bucket{vmrange=\"7.5e-1...8.0e-1\"} 5\nprefix_bucket{vmrange=\"8.5e-1...9.0e-1\"} 5\nprefix_bucket{vmrange=\"9.5e-1...1.0e0\"} 5\nprefix_bucket{vmrange=\"1.0e0...1.5e0\"} 15\nprefix_sum 38\nprefix_count 40\n")
var labels []string
var counts []uint64
@ -162,11 +162,11 @@ func TestHistogramConcurrent(t *testing.T) {
labels = append(labels, label)
counts = append(counts, count)
})
labelsExpected := []string{"5.8e-1...6.0e-1", "6.8e-1...7.0e-1", "7.8e-1...8.0e-1", "8.8e-1...9.0e-1", "9.8e-1...1.0e0", "1.0e0...1.2e0", "1.2e0...1.4e0"}
labelsExpected := []string{"5.5e-1...6.0e-1", "6.5e-1...7.0e-1", "7.5e-1...8.0e-1", "8.5e-1...9.0e-1", "9.5e-1...1.0e0", "1.0e0...1.5e0"}
if !reflect.DeepEqual(labels, labelsExpected) {
t.Fatalf("unexpected labels; got %v; want %v", labels, labelsExpected)
}
countsExpected := []uint64{5, 5, 5, 5, 5, 10, 5}
countsExpected := []uint64{5, 5, 5, 5, 5, 15}
if !reflect.DeepEqual(counts, countsExpected) {
t.Fatalf("unexpected counts; got %v; want %v", counts, countsExpected)
}
@ -180,7 +180,7 @@ func TestHistogramWithTags(t *testing.T) {
var bb bytes.Buffer
WritePrometheus(&bb, false)
result := bb.String()
namePrefixWithTag := `TestHistogram_bucket{tag="foo",vmrange="1.2e2...1.4e2"} 1` + "\n"
namePrefixWithTag := `TestHistogram_bucket{tag="foo",vmrange="1.0e2...1.5e2"} 1` + "\n"
if !strings.Contains(result, namePrefixWithTag) {
t.Fatalf("missing histogram %s in the WritePrometheus output; got\n%s", namePrefixWithTag, result)
}