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* Read manifests directly into the database, rather than first reading 

them into memory.  This brings memory use down to (more or less)
  O(1).  For instance, on my test case, the maximum resident size of
  download-using-manifests while filling the DB went from 142 MiB to
  11 MiB.
This commit is contained in:
Eelco Dolstra 2011-04-11 13:16:54 +00:00
parent 08c8971498
commit 412914d004
1 changed files with 65 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

125
scripts/NixManifest.pm.in
View File

@ -6,6 +6,23 @@ use File::Path;
use Fcntl ':flock';
sub addNAR {
my ($narFiles, $storePath, $info) = @_;
$$narFiles{$storePath} = []
unless defined $$narFiles{$storePath};
my $narFileList = $$narFiles{$storePath};
my $found = 0;
foreach my $narFile (@{$narFileList}) {
$found = 1 if $narFile->{url} eq $info->{url};
}
push @{$narFileList}, $info if !$found;
}
sub addPatch {
my ($patches, $storePath, $patch) = @_;
@ -27,8 +44,8 @@ sub addPatch {
}
sub readManifest {
my ($manifest, $narFiles, $patches) = @_;
sub readManifest_ {
my ($manifest, $addNAR, $addPatch) = @_;
open MANIFEST, "<$manifest"
or die "cannot open `$manifest': $!";
@ -72,35 +89,22 @@ sub readManifest {
$inside = 0;
if ($type eq "narfile") {
$$narFiles{$storePath} = []
unless defined $$narFiles{$storePath};
my $narFileList = $$narFiles{$storePath};
my $found = 0;
foreach my $narFile (@{$narFileList}) {
$found = 1 if $narFile->{url} eq $url;
}
if (!$found) {
push @{$narFileList},
{ url => $url, hash => $hash, size => $size
, narHash => $narHash, narSize => $narSize
, references => $references
, deriver => $deriver
, system => $system
};
}
&$addNAR($storePath,
{ url => $url, hash => $hash, size => $size
, narHash => $narHash, narSize => $narSize
, references => $references
, deriver => $deriver
, system => $system
});
}
elsif ($type eq "patch") {
addPatch $patches, $storePath,
&$addPatch($storePath,
{ url => $url, hash => $hash, size => $size
, basePath => $basePath, baseHash => $baseHash
, narHash => $narHash, narSize => $narSize
, patchType => $patchType
};
});
}
}
@ -134,6 +138,14 @@ sub readManifest {
}
sub readManifest {
my ($manifest, $narFiles, $patches) = @_;
readManifest_($manifest,
sub { addNAR($narFiles, @_); },
sub { addPatch($patches, @_); } );
}
sub writeManifest {
my ($manifest, $narFiles, $patches, $noCompress) = @_;
@ -205,7 +217,7 @@ sub updateManifestDB {
my $dbPath = "$manifestDir/cache.sqlite";
# Open/create the database.
my $dbh = DBI->connect("dbi:SQLite:dbname=$dbPath", "", "")
our $dbh = DBI->connect("dbi:SQLite:dbname=$dbPath", "", "")
or die "cannot open database `$dbPath'";
$dbh->{AutoCommit} = 0;
$dbh->{RaiseError} = 1;
@ -279,10 +291,34 @@ EOF
"select 1 from Manifests where path = ? and timestamp = ?",
{}, $manifest, $timestamp)} == 1;
# !!! Insert directly into the DB.
my %narFiles;
my %patches;
my $version = readManifest($manifest, \%narFiles, \%patches);
$dbh->do("delete from Manifests where path = ?", {}, $manifest);
$dbh->do("insert into Manifests(path, timestamp) values (?, ?)",
{}, $manifest, $timestamp);
our $id = $dbh->sqlite_last_insert_rowid();
sub addNARToDB {
my ($storePath, $narFile) = @_;
$dbh->do(
"insert into NARs(manifest, storePath, url, hash, size, narHash, " .
"narSize, refs, deriver, system) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
{}, $id, $storePath, $narFile->{url}, $narFile->{hash}, $narFile->{size},
$narFile->{narHash}, $narFile->{narSize}, $narFile->{references},
$narFile->{deriver}, $narFile->{system});
};
sub addPatchToDB {
my ($storePath, $patch) = @_;
$dbh->do(
"insert into Patches(manifest, storePath, basePath, baseHash, url, hash, " .
"size, narHash, narSize, patchType) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
{}, $id, $storePath, $patch->{basePath}, $patch->{baseHash}, $patch->{url},
$patch->{hash}, $patch->{size}, $patch->{narHash}, $patch->{narSize},
$patch->{patchType});
};
my $version = readManifest_($manifest, \&addNARToDB, \&addPatchToDB);
if ($version < 3) {
die "you have an old-style manifest `$manifest'; please delete it";
@ -290,37 +326,6 @@ EOF
if ($version >= 10) {
die "manifest `$manifest' is too new; please delete it or upgrade Nix";
}
$dbh->do("delete from Manifests where path = ?", {}, $manifest);
$dbh->do("insert into Manifests(path, timestamp) values (?, ?)",
{}, $manifest, $timestamp);
my $id = $dbh->sqlite_last_insert_rowid();
foreach my $storePath (keys %narFiles) {
my $narFileList = $narFiles{$storePath};
foreach my $narFile (@{$narFiles{$storePath}}) {
$dbh->do(
"insert into NARs(manifest, storePath, url, hash, size, narHash, " .
"narSize, refs, deriver, system) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
{}, $id, $storePath, $narFile->{url}, $narFile->{hash}, $narFile->{size},
$narFile->{narHash}, $narFile->{narSize}, $narFile->{references},
$narFile->{deriver}, $narFile->{system});
}
}
foreach my $storePath (keys %patches) {
my $patchList = $patches{$storePath};
foreach my $patch (@{$patchList}) {
$dbh->do(
"insert into Patches(manifest, storePath, basePath, baseHash, url, hash, " .
"size, narHash, narSize, patchType) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
{}, $id, $storePath, $patch->{basePath}, $patch->{baseHash}, $patch->{url},
$patch->{hash}, $patch->{size}, $patch->{narHash}, $patch->{narSize},
$patch->{patchType});
}
}
}
# Removed cached information for removed manifests from the DB.