FUSE: add configurable in memory chunk cache size

weed/command/mount.go

@@ -9,6 +9,7 @@ type MountOptions struct {
 	replication                 *string
 	ttlSec                      *int
 	chunkSizeLimitMB            *int
+	chunkCacheCountLimit        *int64
 	dataCenter                  *string
 	allowOthers                 *bool
 	umaskString                 *string
@@ -32,6 +33,7 @@ func init() {
 	mountOptions.replication = cmdMount.Flag.String("replication", "", "replication(e.g. 000, 001) to create to files. If empty, let filer decide.")
 	mountOptions.ttlSec = cmdMount.Flag.Int("ttl", 0, "file ttl in seconds")
 	mountOptions.chunkSizeLimitMB = cmdMount.Flag.Int("chunkSizeLimitMB", 4, "local write buffer size, also chunk large files")
+	mountOptions.chunkCacheCountLimit = cmdMount.Flag.Int64("chunkCacheCountLimit", 1000, "number of file chunks to cache in memory")
 	mountOptions.dataCenter = cmdMount.Flag.String("dataCenter", "", "prefer to write to the data center")
 	mountOptions.allowOthers = cmdMount.Flag.Bool("allowOthers", true, "allows other users to access the file system")
 	mountOptions.umaskString = cmdMount.Flag.String("umask", "022", "octal umask, e.g., 022, 0111")

weed/command/mount_std.go

@@ -168,6 +168,7 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		Replication:                 *option.replication,
 		TtlSec:                      int32(*option.ttlSec),
 		ChunkSizeLimit:              int64(chunkSizeLimitMB) * 1024 * 1024,
+		ChunkCacheCountLimit:        *option.chunkCacheCountLimit,
 		DataCenter:                  *option.dataCenter,
 		DirListCacheLimit:           *option.dirListCacheLimit,
 		EntryCacheTtl:               3 * time.Second,