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a5c427bac4
Allocations are reduced by implementing custom json parser via fastjson
lib.
The change also re-uses `promInstant` object in attempt to reduce number
of
allocations when parsing big responses, as usually happens with heavy
recording rules.
```
name old allocs/op new allocs/op delta
ParsePrometheusResponse/Instant-10 9.65k ± 0% 5.60k ± 0% ~ (p=1.000 n=1+1)
```
Signed-off-by: hagen1778 <roman@victoriametrics.com>
---------
Signed-off-by: hagen1778 <roman@victoriametrics.com>
(cherry picked from commit 4f0525852f)
44 lines
1.0 KiB
Go
44 lines
1.0 KiB
Go
package datasource
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import (
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"bytes"
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"io"
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"net/http"
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"os"
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"testing"
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)
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func BenchmarkMetrics(b *testing.B) {
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payload := []byte(`[{"metric":{"__name__":"vm_rows"},"value":[1583786142,"13763"]},{"metric":{"__name__":"vm_requests", "foo":"bar", "baz": "qux"},"value":[1583786140,"2000"]}]`)
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var pi promInstant
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if err := pi.Unmarshal(payload); err != nil {
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b.Fatalf(err.Error())
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}
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b.Run("Instant", func(b *testing.B) {
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for i := 0; i < b.N; i++ {
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_, _ = pi.metrics()
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}
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})
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}
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func BenchmarkParsePrometheusResponse(b *testing.B) {
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req, _ := http.NewRequest("GET", "", nil)
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resp := &http.Response{StatusCode: http.StatusOK}
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data, err := os.ReadFile("testdata/instant_response.json")
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if err != nil {
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b.Fatalf("error while reading file: %s", err)
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}
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resp.Body = io.NopCloser(bytes.NewReader(data))
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b.Run("Instant", func(b *testing.B) {
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for i := 0; i < b.N; i++ {
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_, err := parsePrometheusResponse(req, resp)
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if err != nil {
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b.Fatalf("unexpected parse err: %s", err)
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}
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resp.Body = io.NopCloser(bytes.NewReader(data))
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}
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})
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}
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