Well, it seems that no, as far as journaling is disabled. 
#!/usr/bin/perl

use strict;
use warnings;

use POSIX qw(_exit);
use DBI;
use File::Temp;

$| = 1;
my $dbfile = "/tmp/db-$$";

my $dbh = DBI->connect("dbi:SQLite:$dbfile", "", "", {RaiseError => 1}
+);

$dbh->do("create table queue (child, ix)");

for my $id (0..3) {
    fork or do {
        print "<$id enter>";
        my $dbh = DBI->connect("dbi:SQLite:$dbfile", "", "", {RaiseErr
+or => 1});
        $dbh->do("PRAGMA journal_mode = OFF");
        my $sth;
        while (not defined $sth) {
            $sth = eval { $dbh->prepare("insert into queue values (?, 
+?)") };
        }
        print "<$id with sth>";
        for (1..1000) {
            eval {
                $sth->execute($id, $_);
                print $id;
            };
            $@ and print "<$id error: $@>"
        };
        print "<$id exit>";
        _exit(0);
    }
}

1 while (wait > 0);

my $sth = $dbh->prepare("select count(*) from queue");
$sth->execute;
my $row = $sth->fetchrow_arrayref;
print "\n@$row\n";

[download]
On my Linux box it does 4000 insertions in 35 seconds and having several concurrent processes accessing the same database does not affect its performance noticeably.

update: It seems that even better than disabling the journal, it is to disable synchronous writes (= ensuring that written data actually gets into the disk surface): 

$dbh->do("PRAGMA synchronous = OFF");

[download]

That makes 4000 inserts in 2.5 seconds in my computer, and is safer as the database would not get corrupted unless the OS failed to flush cache data to disk.

In reply to Re^3: A per-instance shared queue among forked child processes? by salva
in thread A per-instance shared queue among forked child processes? by EvanK

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