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TB-SUPPORT  May 2006

TB-SUPPORT May 2006

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Subject:

Re: high cpu load of lcg-info-generic

From:

Steve Traylen <[log in to unmask]>

Reply-To:

Testbed Support for GridPP member institutes <[log in to unmask]>

Date:

Thu, 4 May 2006 11:28:06 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (333 lines)

On Thu, May 04, 2006 at 10:31:14AM +0100 or thereabouts, Kostas Georgiou wrote:
> On Thu, May 04, 2006 at 09:37:05AM +0100, Steve Traylen wrote:
> 
> > On Sat, Apr 29, 2006 at 06:37:47PM +0100 or thereabouts, Kostas Georgiou wrote:
> > > 
> > > Correct me If I am wrong but shouldn't everything else read the data from
> > > the ldap server? The ldap server gets the ldif from lcg-info-generic but
> > > the attributes are stored as OIDs internally so the search will still give
> > > you the same results as the old script right?
> > 
> > Of course you are correct again.
> > 
> > After testing on a couple of other nodes not in production or where the
> > information is non critical it now deployed on our CE 
> > lcgce01.gridpp.rl.ac.uk.
> > 
> > Kostas, this clearly makes a difference in a good direction and should
> > be submitted up the tree for certification and deployment. I'm happy
> > to do that giving you credit of course if you want me to.
> 
> I'll be happy if you can submit it upstream, I suspect that it will
> reach the right people a lot sooner if you do it instead of me.
> 
> Here is a version that uses Net::LDAP::LDIF which makes the code a lot
> easier to read and it should be able to handle LDIF files a lot better
> than hand written regular expressions. The downside is that it requires
> yet another perl module but perl-Net-LDAP is already required by other
> packages so it's not that bad.

Comparing the outputs through a gris of the origional and your regex 
one then the significant difference is the original showed

dn: GlueCEUniqueID=lcgce01.gridpp.rl.ac.uk:2119/jobmanager-lcgpbs-S,mds-vo-nam
 e=local,o=grid
objectClass: GlueCETop
objectClass: GlueCE
objectClass: GlueSchemaVersion
objectClass: GlueCEAccessControlBase
objectClass: GlueCEInfo
objectClass: GlueCEPolicy
objectClass: GlueCEState
objectClass: GlueInformationService
objectClass: GlueKey
GlueCEHostingCluster: lcgce01.gridpp.rl.ac.uk
GlueCEName: S
GlueCEUniqueID: lcgce01.gridpp.rl.ac.uk:2119/jobmanager-lcgpbs-S
GlueCEInfoGatekeeperPort: 2119
GlueCEInfoHostName: lcgce01.gridpp.rl.ac.uk
GlueCEInfoLRMSType: torque
GlueCEInfoLRMSVersion: 2.0.0p7

and your one shows 

dn: glueceuniqueid=lcgce01.gridpp.rl.ac.uk:2119/jobmanager-lcgpbs-s,mds-vo-nam
 e=local,o=grid
GlueSchemaVersionMajor: 1
GlueCEPolicyAssignedJobSlots: 0
GlueCEInfoApplicationDir: /stage/sl3-lcg-exp
objectClass: GlueCETop
objectClass: GlueCE
objectClass: GlueSchemaVersion
objectClass: GlueCEAccessControlBase
objectClass: GlueCEInfo
objectClass: GlueCEPolicy


in particular this instance is lower case , are these both the same
instance in LDIF terms.

Now looking at the your perl('LDAP') version it shows it as
before with camel case instances.

# lcgce01.gridpp.rl.ac.uk:2119/jobmanager-lcgpbs-S, local, grid
dn: GlueCEUniqueID=lcgce01.gridpp.rl.ac.uk:2119/jobmanager-lcgpbs-S,mds-vo-nam
 e=local,o=grid
objectClass: GlueCETop
objectClass: GlueCE
objectClass: GlueSchemaVersion
objectClass: GlueCEAccessControlBase
objectClass: GlueCEInfo
objectClass: GlueCEPolicy
objectClass: GlueCEState
objectClass: GlueInformationService
objectClass: GlueKey
GlueCEHostingCluster: lcgce01.gridpp.rl.ac.uk
GlueCEName: S
GlueCEUniqueID: lcgce01.gridpp.rl.ac.uk:2119/jobmanager-lcgpbs-S
GlueCEInfoGatekeeperPort: 2119
GlueCEInfoHostName: lcgce01.gridpp.rl.ac.uk
GlueCEInfoLRMSType: torque
GlueCEInfoLRMSVersion: 2.0.0p7
GlueCEInfoTotalCPUs: 856
GlueCEInfoJobManager: lcgpbs

so my suspician is that the 1st and 2nd outputs are not equivalent though
it does not matter since perl-Ldap one is probably less error prone
to the previous white space problems and such like.

  Steve





> 
> Cheers,
> Kostas

> #!/usr/bin/perl -w
> use strict;
> use POSIX;
> use File::stat;
> use FileHandle;
> use Net::LDAP::LDIF;
> 
> # Read an ldif file and populate a hash with Net::LDAP::Entry objects.
> sub read_ldif_file($%) {
>     my $file = shift;
>     my $href = shift;
>     my $ldif = Net::LDAP::LDIF->new( $file, "r", onerror => 'die');
>     while( not $ldif->eof ( ) ) {
>         my $entry = $ldif->read_entry ( );
>         if ( ! defined( $href->{lc($entry->dn())} ) ) {
>            $href->{lc($entry->dn())} = $entry;
>         } else {
>            my $old_entry = $href->{lc($entry->dn())};
>            foreach my $attr ( $entry->attributes ) {
>                $old_entry->add( $attr => $entry->get_value( $attr, asref => 1 ) );
>            }
>         }
>     }
>     $ldif->done();
> }
> 
> # Set our process group to a distinct value
> setpgrp();
> 
> #Read in the configuration file.
> my %config = (
>         static_dir => '',
>         plugin_dir => '',
>         provider_dir => '',
>         cache_ttl => '',
>         freshness => '',
>         timeout => '',
>         response => '',
>         temp_dir => '',
> 	 );
> 
> if ($ARGV[0]){	
>     my $fh = new FileHandle $ARGV[0]
> 	or die "Error: Can't open config file: $ARGV[0]\n";
>     foreach (<$fh>){
> 	if ((! m/^\#/) & (m/=/)){
> 	    m/^(.*)=(.*)$/;
> 	    my $key=$1;
> 	    my $value=$2;
> 	    $key=~s/\s+//g;
> 	    $value=~s/\s+//g;
> 	    $config{$key}=$value;
> 	}
>     }
> }else{
>     print "Usage: lcg-info-generic <config file>\n";
>     exit 1;
> }
> 
> while ( my ($key, $value) = each(%config) ) {
>     if ( ! $config{$key} ){
> 	print "Error: configuration parameter $key not set.\n";
> 	exit 2;
> 	}
> }
> 
> my @files=glob("$config{static_dir}/*.ldif");
> 
> my $dynamic_entries = {};
> my $static_entries = {};
> foreach(@files){
>     #Reads the static ldif.
>     read_ldif_file($_, $static_entries);
> }
> 
> chomp($config{temp_dir});
> mkdir($config{temp_dir});
> 
> my @dynamic;
> my @provider;
> my $pid;
> my @pid;
> my $file_time;
> my $current_time=time;
> 
> #Remove junk files.
> my @junk;
> push @junk, glob("$config{plugin_dir}/*~");
> push @junk, glob("$config{provider_dir}/*~");
> push @junk, glob("$config{plugin_dir}/\#*");
> push @junk, glob("$config{provider_dir}/\#*");
> 
> foreach(@junk){
>     remove($_);
> }
> 
> @dynamic=glob("$config{plugin_dir}/*");
> @provider=glob("$config{provider_dir}/*");
> 
> for(@dynamic, @provider){
>     my $chksum = unpack("%64C*", $_);
>     my @file= split ( );
>     $file[0]=~s/.*\///;
> 
>     if(! -e "$config{temp_dir}/$file[0].ldif.$chksum"){
> 	system("touch $config{temp_dir}/$file[0].ldif.$chksum");
> 	$file_time = $current_time - ($config{freshness}+1);
>     }
>     else{
> 	$file_time=stat("$config{temp_dir}/$file[0].ldif.$chksum");
> 	if($file_time){
> 	    $file_time=$file_time->mtime;
> 	}else{
> 	    $file_time=0;
> 	}
>     }
> 
>     if($file_time + $config{freshness} <  $current_time ){
> 	
> 	# Fork the search.
> 	unless ($pid=fork){
> 	    
> 	    close STDOUT;
> 
> 	    # Set our process group to a distinct value.
> 	    setpgrp();
> 	    my $PGRP=getpgrp();
> 	    
> 	    # Eval will kill the process if it times out.
> 	    eval { 
> 		local $SIG{ALRM} = sub { die "GOT TIRED OF WAITING" };
> 		alarm ($config{timeout});  #Will call alarm after the timeout. 
> 		system("$_ > $config{temp_dir}/$file[0].ldif.$chksum.$PGRP");
> 		`mv $config{temp_dir}/$file[0].ldif.$chksum.$PGRP $config{temp_dir}/$file[0].ldif.$chksum`;
> 		alarm(0);           # Cancel the pending alarm if responds.
> 	    };
> 	    
> 	    # This sections is executed if the process times out.
> 	    if ($@ =~ /GOT TIRED OF WAITING/) {
> 		`rm -f $config{temp_dir}/$file[0].ldif.$chksum.$PGRP`;
> 		kill (-SIGKILL(), $PGRP);
> 		exit 1;
> 	    }
> 	    exit 0;
> 	}
> 	push @pid, $pid;
>     }
> }
> 
> # Eval will kill the process if it times out.
> eval { 
>     local $SIG{ALRM} = sub { die "GOT TIRED OF WAITING" };
>     alarm ($config{response});  #Will call alarm after the timeout.
>     foreach(@pid){
> 	waitpid($_,0);
>     }
>     alarm(0);           # Cancel the pending alarm if responds.
> };
> 
> for(@provider){
>     my $chksum = unpack("%64C*", $_);
>     my @file= split ( );
>     $file[0]=~s/.*\///;
>     $file_time=stat("$config{temp_dir}/$file[0].ldif.$chksum");
>     if($file_time){
> 	$file_time=$file_time->mtime;
>     }else{
> 	$file_time=$current_time;
>     }
>     if($file_time + $config{cache_ttl} >  $current_time ){
> 	#Reads the output from the provider script.
>         read_ldif_file("$config{temp_dir}/$file[0].ldif.$chksum", $static_entries);
>     }
> }
> 
> for(@dynamic){
>     my $chksum = unpack("%64C*", $_);
>     my @file= split ( );
>     $file[0]=~s/.*\///;
>     $file_time=stat("$config{temp_dir}/$file[0].ldif.$chksum");
>     if($file_time){
> 	$file_time=$file_time->mtime;
>     }else{
> 	$file_time=$current_time;
>     }
>     if($file_time + $config{cache_ttl} >  $current_time ){
> 	#Reads the output from the dynamic script.
>         read_ldif_file("$config{temp_dir}/$file[0].ldif.$chksum", $dynamic_entries);
>     }
> }
> 
> # Merge dynamic values to the static ones
> # Dynamic entries without corresponding static entries are ignored
> foreach my $dn ( keys %$static_entries ) {
>     if ( defined( $dynamic_entries->{$dn} ) ) {
>            my $dynamic_entry = $dynamic_entries->{$dn};
>            my $static_entry = $static_entries->{$dn};
>            foreach my $attr ( $dynamic_entry->attributes() ) {
>                if( $static_entry->exists($attr) ) {
>                    $static_entry->replace( $attr => $dynamic_entry->get_value( $attr, asref => 1 ) );
>                }
>            }
>     }
> }
> 
> # Write the ldif in STDOUT
> print "\n";
> my $ldif = new Net::LDAP::LDIF("-", "w", 
>                                lowercase => 0, 
>                                encode => 'none',
>                                wrap => 0);
> foreach my $entry ( values %$static_entries ) {
>     $ldif->write( $entry );
> }
> $ldif->done();
> print "\n";
> 
> exit;


-- 
Steve Traylen
[log in to unmask]
http://www.gridpp.ac.uk/

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