[libvirt] [PATCH] examples: Add script to parse topology from capabilities output
Add a demo script originally written by Amador Pahim to parse topology of the host from data provided in the capabilities XML. --- examples/python/topology.py | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100755 examples/python/topology.py diff --git a/examples/python/topology.py b/examples/python/topology.py new file mode 100755 index 0000000..1b678bc --- /dev/null +++ b/examples/python/topology.py @@ -0,0 +1,45 @@ +#!/usr/bin/env python +# Parse topology information from the capabilities XML and use +# them to calculate host topology +# +# Authors: +# Amador Pahim <apahim@redhat.com> +# Peter Krempa <pkrempa@redhat.com> + +import libvirt +import sys +from xml.dom import minidom + +try: + conn = libvirt.openReadOnly(None) +except libvirt.libvirtError: + print 'Failed to connect to the hypervisor' + sys.exit(1) + +try: + capsXML = conn.getCapabilities() +except libvirt.libvirtError: + print 'Failed to request capabilities' + sys.exit(1) + +caps = minidom.parseString(capsXML) +host = caps.getElementsByTagName('host')[0] +cells = host.getElementsByTagName('cells')[0] +total_cpus = cells.getElementsByTagName('cpu').length + +socketIds = [] +siblingsIds = [] + +socketIds = [ proc.getAttribute('socket_id') + for proc in cells.getElementsByTagName('cpu') + if proc.getAttribute('socket_id') not in socketIds ] + +siblingsIds = [ proc.getAttribute('siblings') + for proc in cells.getElementsByTagName('cpu') + if proc.getAttribute('siblings') not in siblingsIds ] + +print "Host topology" +print "NUMA nodes:", cells.getAttribute('num') +print " Sockets:",len(set(socketIds)) +print " Cores:",len(set(siblingsIds)) +print " Threads:",total_cpus -- 1.8.3.2
On 09/02/2013 04:57 PM, Peter Krempa wrote:
Add a demo script originally written by Amador Pahim to parse topology of the host from data provided in the capabilities XML. --- examples/python/topology.py | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100755 examples/python/topology.py
diff --git a/examples/python/topology.py b/examples/python/topology.py new file mode 100755 index 0000000..1b678bc --- /dev/null +++ b/examples/python/topology.py @@ -0,0 +1,45 @@ +#!/usr/bin/env python +# Parse topology information from the capabilities XML and use +# them to calculate host topology +# +# Authors: +# Amador Pahim <apahim@redhat.com> +# Peter Krempa <pkrempa@redhat.com> + +import libvirt +import sys +from xml.dom import minidom + +try: + conn = libvirt.openReadOnly(None) +except libvirt.libvirtError: + print 'Failed to connect to the hypervisor' + sys.exit(1) + +try: + capsXML = conn.getCapabilities() +except libvirt.libvirtError: + print 'Failed to request capabilities' + sys.exit(1) + +caps = minidom.parseString(capsXML) +host = caps.getElementsByTagName('host')[0] +cells = host.getElementsByTagName('cells')[0] +total_cpus = cells.getElementsByTagName('cpu').length + +socketIds = [] +siblingsIds = [] + +socketIds = [ proc.getAttribute('socket_id') + for proc in cells.getElementsByTagName('cpu') + if proc.getAttribute('socket_id') not in socketIds ] + +siblingsIds = [ proc.getAttribute('siblings') + for proc in cells.getElementsByTagName('cpu') + if proc.getAttribute('siblings') not in siblingsIds ] + +print "Host topology" +print "NUMA nodes:", cells.getAttribute('num') +print " Sockets:",len(set(socketIds)) +print " Cores:",len(set(siblingsIds)) +print " Threads:",total_cpus
I won't get into details like len() vs. .length, string formatting, etc. ;-) But please add a space after these commas. Even though I don't know how this will turn out on those weird multi-processor per core and similar architectures/processors, it should turn out OK since you're the one who should know how those will look in the capabilities XML. It would be also worth adding it into specfile like other python examples (I'm guessing those are in libvirt-python). ACK with those two things fixed, Martin
On 09/03/13 11:15, Martin Kletzander wrote:
On 09/02/2013 04:57 PM, Peter Krempa wrote:
Add a demo script originally written by Amador Pahim to parse topology of the host from data provided in the capabilities XML. --- examples/python/topology.py | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100755 examples/python/topology.py
diff --git a/examples/python/topology.py b/examples/python/topology.py new file mode 100755 index 0000000..1b678bc --- /dev/null +++ b/examples/python/topology.py
...
+ +print "Host topology" +print "NUMA nodes:", cells.getAttribute('num') +print " Sockets:",len(set(socketIds)) +print " Cores:",len(set(siblingsIds)) +print " Threads:",total_cpus
I won't get into details like len() vs. .length, string formatting, etc. ;-) But please add a space after these commas.
Hmmm, yeah. My python skills are very weak :/. But as an example, this should be kind of okay :/ I've added the spaces
Even though I don't know how this will turn out on those weird multi-processor per core and similar architectures/processors, it should turn out OK since you're the one who should know how those will look in the capabilities XML.
It would be also worth adding it into specfile like other python examples (I'm guessing those are in libvirt-python).
and added the script to examples/python/Makefile.am. The specfile seems to automatically add all the example python scripts.
ACK with those two things fixed,
Pushed; Thanks.
Martin
Peter
participants (2)
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Martin Kletzander -
Peter Krempa