libindex: add some guess at layer preallocation sizing

Signed-off-by: Hank Donnay <[email protected]>

go.mod

@@ -3,6 +3,7 @@ module github.com/quay/claircore
 go 1.20
 
 require (
+	github.com/HdrHistogram/hdrhistogram-go v1.1.2
 	github.com/Masterminds/semver v1.5.0
 	github.com/doug-martin/goqu/v8 v8.6.0
 	github.com/golang/mock v1.6.0

go.sum

@@ -1,10 +1,15 @@
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 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/DATA-DOG/go-sqlmock v1.3.3 h1:CWUqKXe0s8A2z6qCgkP4Kru7wC11YoAnoupUKFDnH08=
 github.com/DATA-DOG/go-sqlmock v1.3.3/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
+github.com/HdrHistogram/hdrhistogram-go v1.1.2 h1:5IcZpTvzydCQeHzK4Ef/D5rrSqwxob0t8PQPMybUNFM=
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 github.com/Masterminds/semver v1.5.0/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
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+github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
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@@ -15,13 +20,16 @@ github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7
 github.com/coreos/go-systemd v0.0.0-20190719114852-fd7a80b32e1f/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
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+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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+github.com/fogleman/gg v1.2.1-0.20190220221249-0403632d5b90/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
+github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
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@@ -34,11 +42,13 @@ github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/me
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 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
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@@ -100,6 +110,7 @@ github.com/jackc/puddle v0.0.0-20190608224051-11cab39313c9/go.mod h1:m4B5Dj62Y0f
 github.com/jackc/puddle v1.1.3/go.mod h1:m4B5Dj62Y0fbyuIc15OsIqK0+JU8nkqQjsgx7dvjSWk=
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+github.com/jung-kurt/gofpdf v1.0.3-0.20190309125859-24315acbbda5/go.mod h1:7Id9E/uU8ce6rXgefFLlgrJj/GYY22cpxn+r32jIOes=
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@@ -115,6 +126,7 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN
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@@ -138,6 +150,7 @@ github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 h1:jWpvCLoY8Z/e3VKvls
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@@ -226,8 +239,19 @@ golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5y
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@@ -250,6 +274,7 @@ golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
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@@ -285,13 +310,16 @@ golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
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@@ -306,12 +334,18 @@ golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8T
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 google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
 google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/inconshreveable/log15.v2 v2.0.0-20180818164646-67afb5ed74ec/go.mod h1:aPpfJ7XW+gOuirDoZ8gHhLh3kZ1B08FtV2bbmy7Jv3s=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
@@ -333,3 +367,4 @@ modernc.org/strutil v1.2.0 h1:agBi9dp1I+eOnxXeiZawM8F4LawKv4NzGWSaLfyeNZA=
 modernc.org/strutil v1.2.0/go.mod h1:/mdcBmfOibveCTBxUl5B5l6W+TTH1FXPLHZE6bTosX0=
 modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
 modernc.org/token v1.1.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
+rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=

libindex/fetcher.go

@@ -8,13 +8,15 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"math"
 	"net/http"
 	"net/url"
 	"os"
 	"runtime"
 	"strings"
 	"sync"
 
+	"github.com/HdrHistogram/hdrhistogram-go"
 	"github.com/quay/zlog"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/codes"
@@ -45,6 +47,12 @@ var (
 type RemoteFetchArena struct {
 	wc *http.Client
 	sf *singleflight.Group
+	// Use an HDR Histogram to track layer sizes for preallocation.
+	//
+	// This is used instead of hooking an OTel metric because it seems harder to
+	// calculate a mean from that.
+	sizesMu sync.Mutex
+	sizes   *hdrhistogram.Histogram
 
 	// Rc holds (string, *rc).
 	//
@@ -56,9 +64,10 @@ type RemoteFetchArena struct {
 // NewRemoteFetchArena returns an initialized RemoteFetchArena.
 func NewRemoteFetchArena(wc *http.Client, root string) *RemoteFetchArena {
 	return &RemoteFetchArena{
-		wc:   wc,
-		sf:   &singleflight.Group{},
-		root: root,
+		wc:    wc,
+		sf:    &singleflight.Group{},
+		sizes: hdrhistogram.New(int64(os.Getpagesize()), math.MaxUint32, 5),
+		root:  root,
 	}
 }
 
@@ -243,11 +252,15 @@ func (a *RemoteFetchArena) fetchUnlinkedFile(ctx context.Context, key string, de
 	if err != nil {
 		return nil, err
 	}
+	// Resize to the mean layer size this process has seen.
+	a.sizesMu.Lock()
+	szGuess := int64(a.sizes.Mean())
+	a.sizesMu.Unlock()
+	if err := f.Truncate(szGuess); err != nil {
+		return nil, err
+	}
 	vh, want := digest.Hash(), digest.Checksum()
 
-	// It'd be nice to be able to pre-allocate our file on disk, but we can't
-	// because of decompression.
-
 	req := (&http.Request{
 		ProtoMajor: 1,
 		ProtoMinor: 1,
@@ -339,7 +352,17 @@ func (a *RemoteFetchArena) fetchUnlinkedFile(ctx context.Context, key string, de
 
 	buf := bufio.NewWriter(f)
 	n, err := io.Copy(buf, zr)
-	zlog.Debug(ctx).Int64("size", n).Msg("wrote file")
+	ev := zlog.Debug(ctx).
+		Int64("size", n).
+		Int64("guess", szGuess)
+	if ev.Enabled() {
+		sz := float64(n)
+		ev = ev.Float64("percent_error", (math.Abs(sz-float64(szGuess))/sz)*100)
+	}
+	ev.Msg("wrote file")
+	a.sizesMu.Lock()
+	a.sizes.RecordValue(n)
+	a.sizesMu.Unlock()
 	if err != nil {
 		return nil, err
 	}