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Full Discussion: I/O bound computing clusters
Special Forums UNIX and Linux Applications High Performance Computing I/O bound computing clusters Post 302692049 by figaro on Monday 27th of August 2012 03:12:44 AM
Old 08-27-2012
Thank you for your response.
The application runs on a database which is multiple 100GB big and resides on one node only for now. The nodes are either on a local area network or wide area network and are idle the vast majority of the time. Almost all nodes are multi-core machines and currently do not have a database. In other words, the nodes could be put to good use if they had easy access to the data (for instance by having its own partition or LUN) or data is sent across via http (which is likely to be detrimental to performance, as I/O becomes the bottleneck).
Putting the logical partitions on each of the nodes seems like a fruitful route, given that the results are no more than a few GB in size. At the same time, it also seems fairly rigid, because if one of the nodes is down, the system needs to be aware that the missing results will need to be recalculated somewhere else.
 

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XPath::NodeSet(3)					User Contributed Perl Documentation					 XPath::NodeSet(3)

NAME
XML::XPath::NodeSet - a list of XML document nodes DESCRIPTION
An XML::XPath::NodeSet object contains an ordered list of nodes. The nodes each take the same format as described in XML::XPath::XMLParser. SYNOPSIS
my $results = $xp->find('//someelement'); if (!$results->isa('XML::XPath::NodeSet')) { print "Found $results "; exit; } foreach my $context ($results->get_nodelist) { my $newresults = $xp->find('./other/element', $context); ... } API
new() You will almost never have to create a new NodeSet object, as it is all done for you by XPath. get_nodelist() Returns a list of nodes. See XML::XPath::XMLParser for the format of the nodes. string_value() Returns the string-value of the first node in the list. See the XPath specification for what "string-value" means. to_literal() Returns the concatenation of all the string-values of all the nodes in the list. get_node($pos) Returns the node at $pos. The node position in XPath is based at 1, not 0. size() Returns the number of nodes in the NodeSet. pop() Equivalent to perl's pop function. push(@nodes) Equivalent to perl's push function. append($nodeset) Given a nodeset, appends the list of nodes in $nodeset to the end of the current list. shift() Equivalent to perl's shift function. unshift(@nodes) Equivalent to perl's unshift function. prepend($nodeset) Given a nodeset, prepends the list of nodes in $nodeset to the front of the current list. perl v5.18.2 2002-09-02 XPath::NodeSet(3)
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