I've been having some difficulties parsing XML output from the Sun Grid Engine's `qstat` command. Currently, I'm using XML::Smart. However, after creating the XML object and parsing the output (the command outputs a LOT of XML), it will not get all of the data that I want. Here's an example: I run the command qstat -u \* -ext -xml -s r -F: 
<?xml version='1.0'?>
<job_info ... ?revision=1.11">
  <queue_info>
    <Queue-List>
      <name>long_zeta@zeta09.local</name>
      <qtype>BIP</qtype>
      <slots_used>1</slots_used>
      <slots_resv>0</slots_resv>
      <slots_total>8</slots_total>
      <arch>lx26-amd64</arch>
      <resource name="arch" type="hl">lx26-amd64</resource>
      <resource name="num_proc" type="hl">8</resource>
      ...
      <job_list state="running">
        <JB_job_number>642412</JB_job_number>
        <JAT_prio>5.00248</JAT_prio>
        <JAT_ntix>0.00002</JAT_ntix>
        <JB_name>U6s53097</JB_name>
        <JB_owner>npatel37</JB_owner>
        <JB_project>correlat</JB_project>
        <JB_department>defaultdepartment</JB_department>
        <state>r</state>
        <cpu_usage>224919.00000</cpu_usage>
        <mem_usage>15753.53518</mem_usage>
        <io_usage>0.32690</io_usage>
        <tickets>0</tickets>
        <JB_override_tickets>0</JB_override_tickets>
        <JB_jobshare>0</JB_jobshare>
        <otickets>0</otickets>
        <ftickets>0</ftickets>
        <stickets>0</stickets>
        <JAT_share>0.00002</JAT_share>
        <slots>1</slots>
      </job_list>
    </Queue-List>
  </queue_info>
</job_info>

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The problem is, I can't get any info under the <job_list> tag, such as <slots>. No matter what I do, the Perl script will return nothing. Here's the code I'm using: 
use XML::Smart;
my ($xml,$qstat);

$qstat=`qstat -u \* -ext -xml -s r -F`;
$xml  = XML::Smart->new($qstat);

foreach ($xml->{job_info}->{queue_info}->{"Queue-List"}('@') )
  {
     print $_->{job_list}->{slots};
  }

[download]
That script won't print out anything. I've used Data::Dumper and Data::Dump; both printed out the tree exactly as expected, without the <job_list> tag anywhere to be found. I also should point out that, in between the <queue-info> tags, there are many many <Queue-List> tags that may or may not contain a <job_list>. Some have two or three, others have none. However, even Data::Dumper cannot find those, even when I grep for them. Thanks, Ben Olson

In reply to Parsing XML output from `qstat` by Macslayer

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