doc: tuning: additional notes for many inboxes

-extindex is the most important piece for dealing with many
inboxes, so note it first.  Also, frequent use of "git gc" is
important for both loose object performance and reducing memory
mappings.

diff --git a/Documentation/public-inbox-tuning.pod b/Documentation/public-inbox-tuning.pod
index 7b18b3bc403035e0eda5ab6dcb4d2059bdc3fb05..53668eccb7cb85a7a7c0f6149c0c8c54189614e2 100644 (file)
--- a/Documentation/public-inbox-tuning.pod
+++ b/Documentation/public-inbox-tuning.pod
@@ -165,12 +165,15 @@ Other OSes may have similar tuning knobs (patches appreciated).
 
 =head2 Scalability to many inboxes
 
 
 =head2 Scalability to many inboxes
 

+L<public-inbox-extindex(1)> allows any number of public-inboxes
+to share the same Xapian indices.
+

 git 2.33+ startup time is orders-of-magnitude faster and uses
 less memory when dealing with thousands of alternates required
 git 2.33+ startup time is orders-of-magnitude faster and uses
 less memory when dealing with thousands of alternates required

-for thousands of inboxes.
+for thousands of inboxes with L<public-inbox-extindex(1)>.

 
 

-L<public-inbox-extindex(1)> allows any number of public-inboxes
-to share the same Xapian indices.
+Frequent packing (via L<git-gc(1)>) both improves performance
+and reduces the need to increase C<sys.vm.max_map_count>.

 
 =head1 CONTACT
 
 
 =head1 CONTACT
 


@@ -184,6 +187,6 @@ L<http://4uok3hntl7oi7b4uf4rtfwefqeexfzil2w6kgk2jn5z2f764irre7byd.onion/meta/>,
 
 =head1 COPYRIGHT
 
 
 =head1 COPYRIGHT
 

-Copyright 2020-2021 all contributors L<mailto:meta@public-inbox.org>
+Copyright all contributors L<mailto:meta@public-inbox.org>

 
 License: AGPL-3.0+ L<https://www.gnu.org/licenses/agpl-3.0.txt>
 
 License: AGPL-3.0+ L<https://www.gnu.org/licenses/agpl-3.0.txt>