user/dev discussion of public-inbox itself
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From: Eric Wong <e@yhbt.net>
To: meta@public-inbox.org
Subject: [PATCH] msgmap: disable CoW for tmp_clone, too
Date: Wed, 29 Jul 2020 21:25:43 +0000
Message-ID: <20200729212542.GA14149@dcvr> (raw)

The temporary clone starts as large as the full msgmap
and deletes will write to it randomly.  So ensure it
doesn't get fragmented and slower as time goes on.
---
 lib/PublicInbox/Msgmap.pm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/PublicInbox/Msgmap.pm b/lib/PublicInbox/Msgmap.pm
index 51b6a68c..c85e7796 100644
--- a/lib/PublicInbox/Msgmap.pm
+++ b/lib/PublicInbox/Msgmap.pm
@@ -14,6 +14,7 @@ use DBI;
 use DBD::SQLite;
 use File::Temp qw(tempfile);
 use PublicInbox::Over;
+use PublicInbox::Spawn;
 
 sub new {
 	my ($class, $git_dir, $writable) = @_;
@@ -50,6 +51,7 @@ sub new_file {
 sub tmp_clone {
 	my ($self, $dir) = @_;
 	my ($fh, $fn) = tempfile('msgmap-XXXXXXXX', EXLOCK => 0, DIR => $dir);
+	PublicInbox::Spawn::set_nodatacow(fileno($fh));
 	my $tmp;
 	if ($self->{dbh}->can('sqlite_backup_to_dbh')) {
 		$tmp = ref($self)->new_file($fn, 2);

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user/dev discussion of public-inbox itself

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