lunaphied/lix
0
0
Fork 0
forked from lix-project/lix
Code Pull requests Activity

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

Browse source 
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

87
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 @{$narFileList},
&$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;
@ -279,47 +291,40 @@ 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);
if ($version < 3) {
die "you have an old-style manifest `$manifest'; please delete it";
}
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();
our $id = $dbh->sqlite_last_insert_rowid();
foreach my $storePath (keys %narFiles) {
my $narFileList = $narFiles{$storePath};
foreach my $narFile (@{$narFiles{$storePath}}) {
sub addNARToDB {
my ($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});
}
}
};
foreach my $storePath (keys %patches) {
my $patchList = $patches{$storePath};
foreach my $patch (@{$patchList}) {
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";
}
if ($version >= 10) {
die "manifest `$manifest' is too new; please delete it or upgrade Nix";
}
}