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docs: add section about --vfs-cache-max-age

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This change adds a section to clarify how exactly the --vfs-cache-max-age flag affects caching
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NickIAm 2023-03-24 19:28:34 +08:00 committed by GitHub
parent 4b376514a6
commit 1b2f2c0d69
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2 changed files with 14 additions and 3 deletions
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15
vfs/help.go
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@ -86,7 +86,7 @@ find that you need one or the other or both.
--cache-dir string Directory rclone will use for caching.
--vfs-cache-mode CacheMode Cache mode off|minimal|writes|full (default off)
--vfs-cache-max-age duration Max age of objects in the cache (default 1h0m0s)
--vfs-cache-max-age duration Max time since last access of objects in the cache (default 1h0m0s)
--vfs-cache-max-size SizeSuffix Max total size of objects in the cache (default off)
--vfs-cache-poll-interval duration Interval to poll the cache for stale objects (default 1m0s)
--vfs-write-back duration Time to writeback files after last use when using cache (default 5s)
@ -109,7 +109,18 @@ flags.
If using !--vfs-cache-max-size! note that the cache may exceed this size
for two reasons. Firstly because it is only checked every
!--vfs-cache-poll-interval!. Secondly because open files cannot be
evicted from the cache.
evicted from the cache. When !--vfs-cache-max-size!
is exceeded, rclone will attempt to evict the least accessed files
from the cache first. rclone will start with files that haven't
been accessed for the longest. This cache flushing strategy is
efficient and more relevant files are likely to remain cached.
The !--vfs-cache-max-age! will evict files from the cache
after the set time since last access has passed. The default value of
1 hour will start evicting files from cache that haven't been accessed
for 1 hour. When a cached file is accessed the 1 hour timer is reset to 0
and will wait for 1 more hour before evicting. Specify the time with
standard notation, s, m, h, d, w .
You **should not** run two copies of rclone using the same VFS cache
with the same or overlapping remotes if using !--vfs-cache-mode > off!.

2
vfs/vfsflags/vfsflags.go
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@ -26,7 +26,7 @@ func AddFlags(flagSet *pflag.FlagSet) {
flags.BoolVarP(flagSet, &Opt.ReadOnly, "read-only", "", Opt.ReadOnly, "Only allow read-only access")
flags.FVarP(flagSet, &Opt.CacheMode, "vfs-cache-mode", "", "Cache mode off|minimal|writes|full")
flags.DurationVarP(flagSet, &Opt.CachePollInterval, "vfs-cache-poll-interval", "", Opt.CachePollInterval, "Interval to poll the cache for stale objects")
flags.DurationVarP(flagSet, &Opt.CacheMaxAge, "vfs-cache-max-age", "", Opt.CacheMaxAge, "Max age of objects in the cache")
flags.DurationVarP(flagSet, &Opt.CacheMaxAge, "vfs-cache-max-age", "", Opt.CacheMaxAge, "Max time since last access of objects in the cache")
flags.FVarP(flagSet, &Opt.CacheMaxSize, "vfs-cache-max-size", "", "Max total size of objects in the cache")
flags.FVarP(flagSet, &Opt.ChunkSize, "vfs-read-chunk-size", "", "Read the source objects in chunks")
flags.FVarP(flagSet, &Opt.ChunkSizeLimit, "vfs-read-chunk-size-limit", "", "If greater than --vfs-read-chunk-size, double the chunk size after each chunk read, until the limit is reached ('off' is unlimited)")