X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/0a98952530fb465fa31566fa5e0192bea9fc16e4..9d1f08198723f64d23473bb0ef1d6e30df1f4a1f:/services/keep-balance/usage.go

diff --git a/services/keep-balance/usage.go b/services/keep-balance/usage.go
index eb9990c973..d11201047b 100644
--- a/services/keep-balance/usage.go
+++ b/services/keep-balance/usage.go
@@ -7,17 +7,15 @@ import (
 )
 
 var exampleConfigFile = []byte(`
-    {
-	"Client": {
-	    "APIHost": "zzzzz.arvadosapi.com:443",
-	    "AuthToken": "xyzzy",
-	    "Insecure": false
-	},
-	"KeepServiceTypes": [
-	    "disk"
-	],
-	"RunPeriod": "600s"
-    }`)
+Client:
+    APIHost: zzzzz.arvadosapi.com:443
+    AuthToken: xyzzy
+    Insecure: false
+KeepServiceTypes:
+    - disk
+RunPeriod: 600s
+CollectionBatchSize: 100000
+CollectionBuffers: 1000`)
 
 func usage() {
 	fmt.Fprintf(os.Stderr, `
@@ -28,7 +26,7 @@ overreplicated and unreferenced blocks, and moves blocks to better
 positions (according to the rendezvous hash algorithm) so clients find
 them faster.
 
-Usage: keep-balance -config path/to/config.json [options]
+Usage: keep-balance -config path/to/keep-balance.yml [options]
 
 Options:
 `)
@@ -71,6 +69,19 @@ Committing:
     Use the -commit-pull and -commit-trash flags to implement the
     computed changes.
 
+Tuning resource usage:
+
+    CollectionBatchSize limits the number of collections retrieved per
+    API transaction. If this is zero or omitted, page size is
+    determined by the API server's own page size limits (see
+    max_items_per_response and max_index_database_read configs).
+
+    CollectionBuffers sets the size of an internal queue of
+    collections. Higher values use more memory, and improve throughput
+    by allowing keep-balance to fetch the next page of collections
+    while the current page is still being processed. If this is zero
+    or omitted, pages are processed serially.
+
 Limitations:
 
     keep-balance does not attempt to discover whether committed pull