dircache: increase cache size & lifetime

Looking at the dircache debug output, we see
that a "git status" workload has a very bad
cache hit rate because the entries expire or
get evicted before they can be reused.

Increase both cache size and lifetime for
a 4x speedup:

Before: 75s
After:  17s

https://github.com/rfjakob/gocryptfs/issues/410

1 files changed, 5 insertions, 5 deletions

diff --git a/tests/test_helpers/mount_unmount.go b/tests/test_helpers/mount_unmount.go
index cdbdee8..76db41c 100644
--- a/tests/test_helpers/mount_unmount.go
+++ b/tests/test_helpers/mount_unmount.go
@@ -14,6 +14,11 @@ import (
 	"time"
 )
 
+// gocryptfs may hold up to maxCacheFds open for caching
+// Keep in sync with fusefrontend.dirCacheSize
+// TODO: How to share this constant without causing an import cycle?!
+const maxCacheFds = 20
+
 // Indexed by mountpoint. Initialized in doInit().
 var MountInfo map[string]mountInfo
 
@@ -137,11 +142,6 @@ func UnmountPanic(dir string) {
 	}
 }
 
-// gocryptfs may hold up to maxCacheFds open for caching
-// Keep in sync with fusefrontend.dirCacheSize
-// TODO: How to share this constant without causing an import cycle?!
-const maxCacheFds = 3
-
 // UnmountErr tries to unmount "dir", retrying 10 times, and returns the
 // resulting error.
 func UnmountErr(dir string) (err error) {