Change in vdsm[master]: Change source of CPU sockets/cores to libvirt capabilities
danken at redhat.com
danken at redhat.com
Thu Oct 4 19:21:02 UTC 2012
Dan Kenigsberg has posted comments on this change.
Change subject: Change source of CPU sockets/cores to libvirt capabilities
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Patch Set 17: I would prefer that you didn't submit this
(3 inline comments)
Ademar, thanks. I now understand that libvirt does not provide us with the complete topology information, only the number of threads per cell.
I think we should take what we have (exact number of threads), do the heuristic for what we don't, and make these fact explicit in the commit message.
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File tests/capsTests.py
Line 54:
Line 55: def testCpuTopology(self):
Line 56: testPath = os.path.realpath(__file__)
Line 57: dirName = os.path.split(testPath)[0]
Line 58: path = os.path.join(dirName, "caps_libvirt.out")
it could have been nicer if caps_libvirt.out and cpu_info.out have reflected the same host. or better: have a set of host, each one with its caps_libvirt.out and cpu_info.out.
This can wait for a later patch.
Line 59: t = caps.CpuTopology(path)
Line 60: self.assertEqual(t.cores(), 12)
Line 61: self.assertEqual(t.sockets(), 2)
Line 62:
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File vdsm/caps.py
Line 88: self._topology = _getCpuTopology(capabilities)
Line 89:
Line 90: def threads(self):
Line 91: return (self._topology['cells'] *
Line 92: self._topology['sockets'] *
I think that you'd be better off summing up how many cpus appear under <cells>. This would accommodate "funky" numa topologies. What is your opinion?
Too bad that for cores and socket, we would have to assume symmetry between numa nodes.
Line 93: self._topology['cores'] *
Line 94: self._topology['threads'])
Line 95:
Line 96: def cores(self):
Line 91: return (self._topology['cells'] *
Line 92: self._topology['sockets'] *
Line 93: self._topology['cores'] *
Line 94: self._topology['threads'])
Line 95:
Please add a little comment like:
# this assumes that all numa nodes have the same number of sockets,
# and that all socket have the same number of cores.
and explain this limitation in the commit message.
Line 96: def cores(self):
Line 97: return (self._topology['cells'] *
Line 98: self._topology['sockets'] *
Line 99: self._topology['cores'])
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Gerrit-MessageType: comment
Gerrit-Change-Id: I1619e3d9e042bc801c988f099d3b84922f4e03d3
Gerrit-PatchSet: 17
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Amador Pahim <apahim at redhat.com>
Gerrit-Reviewer: Amador Pahim <apahim at redhat.com>
Gerrit-Reviewer: Dan Kenigsberg <danken at redhat.com>
Gerrit-Reviewer: Doron Fediuck <dfediuck at redhat.com>
Gerrit-Reviewer: Douglas Schilling Landgraf <dougsland at redhat.com>
Gerrit-Reviewer: Gal Hammer <ghammer at redhat.com>
Gerrit-Reviewer: Laszlo Hornyak <lhornyak at redhat.com>
Gerrit-Reviewer: Michal Skrivanek <michal.skrivanek at redhat.com>
Gerrit-Reviewer: Shu Ming <shuming at linux.vnet.ibm.com>
Gerrit-Reviewer: oVirt Jenkins CI Server
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