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Fix test to work with non-8kB block sizes

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Author: Maxim Orlov <orlovmg@gmail.com>
Discussion: https://www.postgresql.org/message-id/CACG%3Dezbtm%2BLOzEMyLX7rzGcAv3ez3F6nNpSJjvZeMzed0Oe6Pw%40mail.gmail.com
This commit is contained in:
Heikki Linnakangas
2025-12-05 23:39:01 +02:00
parent d0d873c382
commit 7c2061bdfb
1 changed files with 17 additions and 5 deletions
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22
src/test/modules/test_slru/t/002_multixact_wraparound.pl
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@@ -25,19 +25,31 @@ command_ok(
],
"set the cluster's next multitransaction to 0xFFFFFFF8");
# Extract a few values from pg_resetwal --dry-run output that we need for
# the calculations below
my $out = (run_command([ 'pg_resetwal', '--dry-run', $node->data_dir ]))[0];
$out =~ /^Database block size: *(\d+)$/m or die;
my $blcksz = $1;
$out =~ /^Pages per SLRU segment: *(\d+)$/m or die;
my $slru_pages_per_segment = $1;
# Fixup the SLRU files to match the state we reset to.
# initialize SLRU file with zeros (65536 entries * 4 bytes = 262144 bytes)
my $slru_file = "$node_pgdata/pg_multixact/offsets/FFFF";
# initialize the 'offsets' SLRU file containing the new next multixid
# with zeros
my $multixact_offsets_per_page = $blcksz / 4; # sizeof(MultiXactOffset) == 4
my $segno =
int(0xFFFFFFF8 / $multixact_offsets_per_page / $slru_pages_per_segment);
my $slru_file = sprintf('%s/pg_multixact/offsets/%04X', $node_pgdata, $segno);
open my $fh, ">", $slru_file
or die "could not open \"$slru_file\": $!";
binmode $fh;
# Write 65536 entries of 4 bytes each (all zeros)
syswrite($fh, "\0" x 262144) == 262144
my $bytes_per_seg = $slru_pages_per_segment * $blcksz;
syswrite($fh, "\0" x $bytes_per_seg) == $bytes_per_seg
or die "could not write to \"$slru_file\": $!";
close $fh;
# remove old SLRU file
# remove old file
unlink("$node_pgdata/pg_multixact/offsets/0000")
or die "could not unlink \"$node_pgdata/pg_multixact/offsets/0000\": $!";