user/dev discussion of public-inbox itself
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From: Eric Wong <e@yhbt.net>
To: meta@public-inbox.org
Subject: [PATCH 4/5] msgmap: use TRUNCATE for journal_mode, for now
Date: Sun, 10 May 2020 22:37:14 +0000	[thread overview]
Message-ID: <20200510223715.19254-5-e@yhbt.net> (raw)
In-Reply-To: <20200510223715.19254-1-e@yhbt.net>

It avoids I/O on the directory itself, which could prolong
the lifetime of the storage device.
---
 lib/PublicInbox/Msgmap.pm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/PublicInbox/Msgmap.pm b/lib/PublicInbox/Msgmap.pm
index 9523752e9af..5fe14383ac4 100644
--- a/lib/PublicInbox/Msgmap.pm
+++ b/lib/PublicInbox/Msgmap.pm
@@ -48,6 +48,10 @@ sub new_file {
 
 	if ($writable) {
 		create_tables($dbh);
+
+		# TRUNCATE reduces I/O compared to the default (DELETE)
+		$dbh->do('PRAGMA journal_mode = TRUNCATE');
+
 		$dbh->begin_work;
 		$self->created_at(time) unless $self->created_at;
 

  parent reply	other threads:[~2020-05-10 22:37 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-10 22:37 [PATCH 0/5] scattered dev/CLI-oriented changes Eric Wong
2020-05-10 22:37 ` [PATCH 1/5] xt/eml_check_limits: check limits against an inbox Eric Wong
2020-05-10 22:37 ` [PATCH 2/5] rename "ContentId" to "ContentHash" Eric Wong
2020-05-10 22:37 ` [PATCH 3/5] overidx: document the SQLite PRAGMA we use Eric Wong
2020-05-10 22:37 ` Eric Wong [this message]
2020-05-10 22:37 ` [PATCH 5/5] spawn: use ~/.cache/public-inbox/inline-c if writable Eric Wong
2020-05-11  0:29   ` Eric Wong
2020-05-11  4:27     ` [PATCH v2] " Eric Wong

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