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test: add benchmark for peerQueue #204

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test: add benchmark for peerQueue #204

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58 changes: 58 additions & 0 deletions p2p/peer_stats_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,9 +3,12 @@ package p2p
import (
"container/heap"
"context"
"fmt"
"math/rand"
"testing"
"time"

"github.com/libp2p/go-libp2p/core/crypto"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/stretchr/testify/require"
)
Expand Down Expand Up @@ -110,3 +113,58 @@ func Test_StatDecreaseScore(t *testing.T) {
pStats.decreaseScore()
require.Equal(t, pStats.score(), float32(80.0))
}

// BenchmarkPeerQueue/push_for_10-14 2373187 489.3 ns/op 448 B/op 8 allocs/op
// BenchmarkPeerQueue/pop_for_10-14 1561532 761.8 ns/op 800 B/op 10 allocs/op
// BenchmarkPeerQueue/push_for_100-14 253057 4590 ns/op 2368 B/op 11 allocs/op
// BenchmarkPeerQueue/pop_for_100-14 151729 7503 ns/op 8000 B/op 100 allocs/op
// BenchmarkPeerQueue/push_for_1000-14 25915 46220 ns/op 17728 B/op 14 allocs/op
// BenchmarkPeerQueue/pop_for_1000-14 15207 75764 ns/op 80000 B/op 1000 allocs/op
// BenchmarkPeerQueue/push_for_1000000-14 15 69555594 ns/op 44948820 B/op 41 allocs/op
// BenchmarkPeerQueue/pop_for_1000000-14 15 75170956 ns/op 80000032 B/op 1000000 allocs/op
func BenchmarkPeerQueue(b *testing.B) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()

peers := [][]*peerStat{
generatePeerStats(b, 10),
generatePeerStats(b, 100),
generatePeerStats(b, 1000),
generatePeerStats(b, 1000000),
}

for _, peerStats := range peers {
var queue *peerQueue
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I think keeping queue inside every subtest will be better to misuse it in the future (assume moving 1 subtest before another or so).

b.Run(fmt.Sprintf("push for %d", len(peerStats)), func(b *testing.B) {
b.ResetTimer()
b.ReportAllocs()
for i := 0; i < b.N; i++ {
queue = newPeerQueue(ctx, peerStats)
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Initially I thought it's a bad func to bench but it's getting interesting.

We create a new peerQueue for every session which is created per every GetRangeByHeight request. Here is the thing: in newPeerQueue we init priority queue via heap.Init function which creates queue in an optimal way (O(N) instead of O(N*logN) to be precise). BUT! we aren't using it correctly, we init heap with an empty slice and pushing elements one by one, which will result in O(N*logN) work.

if we will change newPeerStats to something like:

func newPeerStats(peers []*peerStat) peerStats {
	ps := make(peerStats, len(peers))
	copy(ps, peers)
	heap.Init(&ps)
	return ps
}

We can get the following results:

% go-perftuner bstat acopy.txt bcopy.txt 
args: [acopy.txt bcopy.txt]name                           old time/op    new time/op    delta
PeerQueue/push_for_10-10          784ns ± 0%     546ns ± 1%  -30.31%  (p=0.004 n=5+6)
PeerQueue/push_for_100-10        7.86µs ± 1%    5.95µs ± 0%  -24.29%  (p=0.004 n=6+5)
PeerQueue/push_for_1000-10       84.5µs ± 0%    59.3µs ± 0%  -29.80%  (p=0.002 n=6+6)
PeerQueue/push_for_1000000-10     116ms ± 2%     134ms ± 0%  +14.66%  (p=0.004 n=6+5)

name                           old alloc/op   new alloc/op   delta
PeerQueue/push_for_10-10           448B ± 0%      280B ± 0%  -37.50%  (p=0.002 n=6+6)
PeerQueue/push_for_100-10        2.37kB ± 0%    1.10kB ± 0%  -53.72%  (p=0.002 n=6+6)
PeerQueue/push_for_1000-10       17.7kB ± 0%     8.4kB ± 0%  -52.66%  (p=0.002 n=6+6)
PeerQueue/push_for_1000000-10    44.9MB ± 0%     8.0MB ± 0%  -82.19%  (p=0.002 n=6+6)

name                           old allocs/op  new allocs/op  delta
PeerQueue/push_for_10-10           8.00 ± 0%      4.00 ± 0%  -50.00%  (p=0.002 n=6+6)
PeerQueue/push_for_100-10          11.0 ± 0%       4.0 ± 0%  -63.64%  (p=0.002 n=6+6)
PeerQueue/push_for_1000-10         14.0 ± 0%       4.0 ± 0%  -71.43%  (p=0.002 n=6+6)
PeerQueue/push_for_1000000-10      41.0 ± 0%       4.0 ± 0%  -90.24%  (p=0.002 n=6+6)

(no idea why pushing 1M peers resulted in +15% time, yet).

}
})

b.Run(fmt.Sprintf("pop for %d", len(peerStats)), func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
for range peerStats {
_ = queue.waitPop(ctx)
}
}
})
}
}

func generatePeerStats(b *testing.B, number int) []*peerStat {
stats := make([]*peerStat, number)
for i := range stats {
priv, _, err := crypto.GenerateKeyPair(crypto.Ed25519, 256)
require.NoError(b, err)
id, err := peer.IDFromPrivateKey(priv)
require.NoError(b, err)
stats[i] = &peerStat{
peerID: id,
peerScore: rand.Float32(),
}
}
return stats
}
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