From: Eric Wong <e@80x24.org>
To: meta@public-inbox.org
Subject: [PATCH] doc: tuning: add a note about Linux sys.vm.max_map_count
Date: Thu, 24 Jun 2021 08:32:05 +0000 [thread overview]
Message-ID: <20210624083205.16675-1-e@80x24.org> (raw)
git tends to die when mmap(2) fails on this limit, so let
users know about it. Perhaps git could gracefully fallback.
---
Documentation/public-inbox-tuning.pod | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/Documentation/public-inbox-tuning.pod b/Documentation/public-inbox-tuning.pod
index 58937f73..67316fb1 100644
--- a/Documentation/public-inbox-tuning.pod
+++ b/Documentation/public-inbox-tuning.pod
@@ -34,6 +34,10 @@ Performance on solid state drives
Read-only daemons
+=item 7
+
+Other OS tuning knobs
+
=back
=head2 New inboxes: public-inbox-init -V2
@@ -148,6 +152,15 @@ Transport Layer Security (IMAPS, NNTPS, or via STARTTLS) significantly
increases memory use of client sockets, sure to account for that in
capacity planning.
+=head2 Other OS tuning knobs
+
+Linux users: the C<sys.vm.max_map_count> sysctl may need to be increased if
+handling thousands of inboxes (with L<public-inbox-extindex(1)>) to avoid
+out-of-memory errors from git.
+
+Other OSes may have similar tuning knobs (patches appreciated).
+
+
=head1 CONTACT
Feedback encouraged via plain-text mail to L<mailto:meta@public-inbox.org>
reply other threads:[~2021-06-24 8:32 UTC|newest]
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