[wip] more concurrent catalogers

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

cmd/syft/internal/commands/attest.go

@@ -13,6 +13,7 @@ import (
 	"github.com/wagoodman/go-progress"
 
 	"github.com/anchore/clio"
+	"github.com/anchore/go-sync"
 	"github.com/anchore/stereoscope"
 	"github.com/anchore/syft/cmd/syft/internal/options"
 	"github.com/anchore/syft/cmd/syft/internal/ui"
@@ -252,6 +253,8 @@ func generateSBOMForAttestation(ctx context.Context, id clio.Identification, opt
 		return nil, fmt.Errorf("attest requires use of an OCI registry directly, one or more of the specified sources is unsupported: %v", opts.From)
 	}
 
+	ctx = sync.SetContextExecutor(ctx, sync.NewExecutor(opts.Parallelism))
+
 	src, err := getSource(ctx, opts, userInput, stereoscope.RegistryTag)
 
 	if err != nil {

cmd/syft/internal/commands/scan.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/anchore/clio"
 	"github.com/anchore/go-collections"
+	"github.com/anchore/go-sync"
 	"github.com/anchore/stereoscope"
 	"github.com/anchore/stereoscope/pkg/image"
 	"github.com/anchore/syft/cmd/syft/internal/options"
@@ -167,6 +168,8 @@ func validateArgs(cmd *cobra.Command, args []string, error string) error {
 }
 
 func runScan(ctx context.Context, id clio.Identification, opts *scanOptions, userInput string) error {
+	ctx = sync.SetContextExecutor(ctx, sync.NewExecutor(opts.Parallelism))
+
 	writer, err := opts.SBOMWriter()
 	if err != nil {
 		return err

cmd/syft/internal/options/catalog.go

@@ -2,6 +2,7 @@ package options
 
 import (
 	"fmt"
+	"runtime"
 	"sort"
 	"strings"
 
@@ -72,7 +73,7 @@ func DefaultCatalog() Catalog {
 		File:          defaultFileConfig(),
 		Relationships: defaultRelationshipsConfig(),
 		Source:        defaultSourceConfig(),
-		Parallelism:   1,
+		Parallelism:   runtime.NumCPU() * 3,
 	}
 }