8:30 a.m.
------=_Part_23935490_2012384362.1403872214216
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Hi,
Due to the recent discussion (http://gerrit.ovirt.org/#/c/28712/), and as part
of the ongoing focus on scalability and performances (http://gerrit.ovirt.org/#/c/17694/
and many others),
I took the chance to do a very quick and dirty bench to see how it really cost
to do XML processing in sampling threads (thanks to Nir for the kickstart!), and,
in general, how much the XML processing costs.
Please find attached the test script and the example XML
(real one made by VDSM master on my RHEL6.5 box).
On my laptop:
$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 58
Model name: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz
Stepping: 9
CPU MHz: 1359.375
CPU max MHz: 3600.0000
CPU min MHz: 1200.0000
BogoMIPS: 5786.91
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 4096K
NUMA node0 CPU(s): 0-3
8 GiBs of RAM, running GNOME desktop and the usual development stuff
xmlbench.py linuxvm1.xml MODE 300
MODE is either 'md' (minidom) or 'cet' (cElementTree).
This will run $NUMTHREADS threads fast and loose without synchronization.
We can actually have this behaviour if a customer just mass start VMs.
In general I expect some clustering of the sampling activity, not a nice evenly
interleaved
time sequence.
CPU measurement: just opened a terminal and run 'htop' on it.
CPU profile: clustered around the sampling interval. Usage negligible most of time, peak
on sampling as shown below
300 VMs
minidom: ~38% CPU
cElementTree: ~5% CPU
500 VMs
minidom: ~48% CPU
cElementTree: ~6% CPU
1000 VMs
python thread error :)
File "/usr/lib64/python2.7/threading.py", line 746, in start
_start_new_thread(self.__bootstrap, ())
thread.error: can't start new thread
I think this is another proof (if we need more of them) that
* we _really need_ to move away from the 1 thread per VM model ->
http://gerrit.ovirt.org/#/c/29189/ and friends! Let's fire up the discussion!
* we should move to cElementTree anyway in the near future: faster processing, scales
better, nicer API.
It is also a pet peeve of mine, I do have some patches floating but we need still some
preparation work in the virt package.
--
Francesco Romani
RedHat Engineering Virtualization R & D
Phone: 8261328
IRC: fromani
------=_Part_23935490_2012384362.1403872214216
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------=_Part_23935490_2012384362.1403872214216--
8:43 a.m.
New subject: [VDSM] Re: XML benchmarks
Of course this is VDSM-only, I tend to forget the tag, sorry.
Bests,
----- Original Message -----
From: "Francesco Romani" <fromani(a)redhat.com>
To: devel(a)ovirt.org
Sent: Friday, June 27, 2014 2:30:14 PM
Subject: [ovirt-devel] XML benchmarks
Hi,
Due to the recent discussion (http://gerrit.ovirt.org/#/c/28712/), and as
part
of the ongoing focus on scalability and performances
(http://gerrit.ovirt.org/#/c/17694/ and many others),
I took the chance to do a very quick and dirty bench to see how it really
cost
to do XML processing in sampling threads (thanks to Nir for the kickstart!),
and,
in general, how much the XML processing costs.
Please find attached the test script and the example XML
(real one made by VDSM master on my RHEL6.5 box).
On my laptop:
$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 58
Model name: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz
Stepping: 9
CPU MHz: 1359.375
CPU max MHz: 3600.0000
CPU min MHz: 1200.0000
BogoMIPS: 5786.91
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 4096K
NUMA node0 CPU(s): 0-3
8 GiBs of RAM, running GNOME desktop and the usual development stuff
xmlbench.py linuxvm1.xml MODE 300
MODE is either 'md' (minidom) or 'cet' (cElementTree).
This will run $NUMTHREADS threads fast and loose without synchronization.
We can actually have this behaviour if a customer just mass start VMs.
In general I expect some clustering of the sampling activity, not a nice
evenly interleaved
time sequence.
CPU measurement: just opened a terminal and run 'htop' on it.
CPU profile: clustered around the sampling interval. Usage negligible most of
time, peak on sampling as shown below
300 VMs
minidom: ~38% CPU
cElementTree: ~5% CPU
500 VMs
minidom: ~48% CPU
cElementTree: ~6% CPU
1000 VMs
python thread error :)
File "/usr/lib64/python2.7/threading.py", line 746, in start
_start_new_thread(self.__bootstrap, ())
thread.error: can't start new thread
I think this is another proof (if we need more of them) that
* we _really need_ to move away from the 1 thread per VM model ->
http://gerrit.ovirt.org/#/c/29189/ and friends! Let's fire up the
discussion!
* we should move to cElementTree anyway in the near future: faster
processing, scales better, nicer API.
It is also a pet peeve of mine, I do have some patches floating but we need
still some preparation work in the virt package.
--
Francesco Romani
RedHat Engineering Virtualization R & D
Phone: 8261328
IRC: fromani
_______________________________________________
Devel mailing list
Devel(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/devel
--
Francesco Romani
RedHat Engineering Virtualization R & D
Phone: 8261328
IRC: fromani
9:03 a.m.
New subject: [VDSM] Re: XML benchmarks
----- Original Message -----
From: "Francesco Romani" <fromani(a)redhat.com>
To: devel(a)ovirt.org
Sent: Friday, June 27, 2014 2:43:01 PM
Subject: [ovirt-devel] [VDSM] Re: XML benchmarks
Of course this is VDSM-only, I tend to forget the tag, sorry.
Bests,
----- Original Message -----
> From: "Francesco Romani" <fromani(a)redhat.com>
> To: devel(a)ovirt.org
> Sent: Friday, June 27, 2014 2:30:14 PM
> Subject: [ovirt-devel] XML benchmarks
>
> Hi,
>
> Due to the recent discussion (http://gerrit.ovirt.org/#/c/28712/), and as
> part
> of the ongoing focus on scalability and performances
> (http://gerrit.ovirt.org/#/c/17694/ and many others),
>
> I took the chance to do a very quick and dirty bench to see how it really
> cost
> to do XML processing in sampling threads (thanks to Nir for the
> kickstart!),
> and,
> in general, how much the XML processing costs.
>
> Please find attached the test script and the example XML
> (real one made by VDSM master on my RHEL6.5 box).
>
> On my laptop:
>
> $ lscpu
> Architecture: x86_64
> CPU op-mode(s): 32-bit, 64-bit
> Byte Order: Little Endian
> CPU(s): 4
> On-line CPU(s) list: 0-3
> Thread(s) per core: 2
> Core(s) per socket: 2
> Socket(s): 1
> NUMA node(s): 1
> Vendor ID: GenuineIntel
> CPU family: 6
> Model: 58
> Model name: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz
> Stepping: 9
> CPU MHz: 1359.375
> CPU max MHz: 3600.0000
> CPU min MHz: 1200.0000
> BogoMIPS: 5786.91
> Virtualization: VT-x
> L1d cache: 32K
> L1i cache: 32K
> L2 cache: 256K
> L3 cache: 4096K
> NUMA node0 CPU(s): 0-3
>
> 8 GiBs of RAM, running GNOME desktop and the usual development stuff
>
> xmlbench.py linuxvm1.xml MODE 300
>
> MODE is either 'md' (minidom) or 'cet' (cElementTree).
> This will run $NUMTHREADS threads fast and loose without synchronization.
> We can actually have this behaviour if a customer just mass start VMs.
> In general I expect some clustering of the sampling activity, not a nice
> evenly interleaved
> time sequence.
>
> CPU measurement: just opened a terminal and run 'htop' on it.
> CPU profile: clustered around the sampling interval. Usage negligible most
> of
> time, peak on sampling as shown below
>
> 300 VMs
> minidom: ~38% CPU
> cElementTree: ~5% CPU
>
> 500 VMs
> minidom: ~48% CPU
> cElementTree: ~6% CPU
>
> 1000 VMs
> python thread error :)
>
> File "/usr/lib64/python2.7/threading.py", line 746, in start
> _start_new_thread(self.__bootstrap, ())
> thread.error: can't start new thread
>
>
> I think this is another proof (if we need more of them) that
> * we _really need_ to move away from the 1 thread per VM model ->
> http://gerrit.ovirt.org/#/c/29189/ and friends! Let's fire up the
> discussion!
I'm all for this.
> * we should move to cElementTree anyway in the near future:
faster
> processing, scales better, nicer API.
> It is also a pet peeve of mine, I do have some patches floating but we
> need
> still some preparation work in the virt package.
Agreed!
>
>
> --
> Francesco Romani
> RedHat Engineering Virtualization R & D
> Phone: 8261328
> IRC: fromani
>
> _______________________________________________
> Devel mailing list
> Devel(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/devel
--
Francesco Romani
RedHat Engineering Virtualization R & D
Phone: 8261328
IRC: fromani
_______________________________________________
Devel mailing list
Devel(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/devel
10:41 a.m.
New subject: [VDSM] Re: XML benchmarks
On Fri, Jun 27, 2014 at 08:43:01AM -0400, Francesco Romani wrote:
>
> 1000 VMs
> python thread error :)
>
> File "/usr/lib64/python2.7/threading.py", line 746, in start
> _start_new_thread(self.__bootstrap, ())
> thread.error: can't start new thread
>
>
> I think this is another proof (if we need more of them) that
> * we _really need_ to move away from the 1 thread per VM model ->
> http://gerrit.ovirt.org/#/c/29189/ and friends! Let's fire up the
> discussion!
True, but it's interesting to understand what is the limit that you have
banged into. Not enough PIDs? Memory?
10:47 a.m.
New subject: [VDSM] Re: XML benchmarks
----- Original Message -----
From: "Dan Kenigsberg" <danken(a)redhat.com>
To: "Francesco Romani" <fromani(a)redhat.com>
Cc: devel(a)ovirt.org
Sent: Friday, June 27, 2014 4:41:25 PM
Subject: Re: [ovirt-devel] [VDSM] Re: XML benchmarks
On Fri, Jun 27, 2014 at 08:43:01AM -0400, Francesco Romani wrote:
> >
> > 1000 VMs
> > python thread error :)
> >
> > File "/usr/lib64/python2.7/threading.py", line 746, in start
> > _start_new_thread(self.__bootstrap, ())
> > thread.error: can't start new thread
> >
> >
> > I think this is another proof (if we need more of them) that
> > * we _really need_ to move away from the 1 thread per VM model ->
> > http://gerrit.ovirt.org/#/c/29189/ and friends! Let's fire up the
> > discussion!
True, but it's interesting to understand what is the limit that you have
banged into. Not enough PIDs? Memory?
Good point. Will investigate a bit more and report the results.
--
Francesco Romani
RedHat Engineering Virtualization R & D
Phone: 8261328
IRC: fromani
4:34 a.m.
----- Original Message -----
From: "Francesco Romani" <fromani(a)redhat.com>
To: devel(a)ovirt.org
Sent: Friday, June 27, 2014 3:30:14 PM
Subject: [ovirt-devel] XML benchmarks
Hi,
Due to the recent discussion (http://gerrit.ovirt.org/#/c/28712/), and as
part
of the ongoing focus on scalability and performances
(http://gerrit.ovirt.org/#/c/17694/ and many others),
I took the chance to do a very quick and dirty bench to see how it really
cost
to do XML processing in sampling threads (thanks to Nir for the kickstart!),
and,
in general, how much the XML processing costs.
Please find attached the test script and the example XML
(real one made by VDSM master on my RHEL6.5 box).
On my laptop:
$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 58
Model name: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz
Stepping: 9
CPU MHz: 1359.375
CPU max MHz: 3600.0000
CPU min MHz: 1200.0000
BogoMIPS: 5786.91
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 4096K
NUMA node0 CPU(s): 0-3
8 GiBs of RAM, running GNOME desktop and the usual development stuff
xmlbench.py linuxvm1.xml MODE 300
MODE is either 'md' (minidom) or 'cet' (cElementTree).
This will run $NUMTHREADS threads fast and loose without synchronization.
We can actually have this behaviour if a customer just mass start VMs.
In general I expect some clustering of the sampling activity, not a nice
evenly interleaved
time sequence.
CPU measurement: just opened a terminal and run 'htop' on it.
CPU profile: clustered around the sampling interval. Usage negligible most of
time, peak on sampling as shown below
300 VMs
minidom: ~38% CPU
cElementTree: ~5% CPU
What is 38% - (38% of one core? how may cores are on the machine?)
500 VMs
minidom: ~48% CPU
cElementTree: ~6% CPU
1000 VMs
python thread error :)
File "/usr/lib64/python2.7/threading.py", line 746, in start
_start_new_thread(self.__bootstrap, ())
thread.error: can't start new thread
I think this is another proof (if we need more of them) that
* we _really need_ to move away from the 1 thread per VM model ->
http://gerrit.ovirt.org/#/c/29189/ and friends! Let's fire up the
discussion!
* we should move to cElementTree anyway in the near future: faster
processing, scales better, nicer API.
It is also a pet peeve of mine, I do have some patches floating but we need
still some preparation work in the virt package.
Seeing this load created by parsing libvirt xml every 15 seconds, I think
we should consider decreasing the sample rate suggested in
http://gerrit.ovirt.org/28712 Or collecting the data in another way.
Nir
2:47 a.m.
----- Original Message -----
From: "Nir Soffer" <nsoffer(a)redhat.com>
To: "Francesco Romani" <fromani(a)redhat.com>
Cc: devel(a)ovirt.org, "Martin Sivak" <msivak(a)redhat.com>
Sent: Sunday, June 29, 2014 10:34:08 AM
Subject: Re: [ovirt-devel] XML benchmarks
> CPU measurement: just opened a terminal and run 'htop'
on it.
> CPU profile: clustered around the sampling interval. Usage negligible most
> of
> time, peak on sampling as shown below
>
> 300 VMs
> minidom: ~38% CPU
> cElementTree: ~5% CPU
What is 38% - (38% of one core? how may cores are on the machine?)
4 cores: 2 physical, 2 logical. I'm prepping a more precise test
using a better and less ambiguous indicator.
Seeing this load created by parsing libvirt xml every 15 seconds, I
think
we should consider decreasing the sample rate suggested in
http://gerrit.ovirt.org/28712 Or collecting the data in another way.
To collect the data in another way, maybe just after the event which will
trigger the change would be the best way. As last resort, to move te code
to use cElementTree.
Bests,
--
Francesco Romani
RedHat Engineering Virtualization R & D
Phone: 8261328
IRC: fromani
5:14 a.m.
------=_Part_233010_1164979986.1404119674471
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
----- Original Message -----
From: "Francesco Romani" <fromani(a)redhat.com>
To: "Nir Soffer" <nsoffer(a)redhat.com>
Cc: devel(a)ovirt.org
Sent: Monday, June 30, 2014 8:47:15 AM
Subject: Re: [ovirt-devel] XML benchmarks
----- Original Message -----
> From: "Nir Soffer" <nsoffer(a)redhat.com>
> To: "Francesco Romani" <fromani(a)redhat.com>
> Cc: devel(a)ovirt.org, "Martin Sivak" <msivak(a)redhat.com>
> Sent: Sunday, June 29, 2014 10:34:08 AM
> Subject: Re: [ovirt-devel] XML benchmarks
> > CPU measurement: just opened a terminal and run 'htop' on it.
> > CPU profile: clustered around the sampling interval. Usage negligible
> > most
> > of
> > time, peak on sampling as shown below
> >
> > 300 VMs
> > minidom: ~38% CPU
> > cElementTree: ~5% CPU
>
> What is 38% - (38% of one core? how may cores are on the machine?)
4 cores: 2 physical, 2 logical. I'm prepping a more precise test
using a better and less ambiguous indicator.
Here. Attached un updated script (xmlbench2.py) which uses 'psutil'
(https://pypi.python.org/pypi/psutil) to gather the samples.
CPU sampled each 500ms (half a second). 100% is one core.
My laptop reports 4 core (dualcore with hyperthreading).
See attached some graphs for easier comsumption and their gnuplot recipe.
cpu_300t_3m.png: load using the test script with 300 threads, each thread runs ~3 minutes
cpu_500t_3m.png: load using the test script with 500 threads, each thread runs ~3 minutes
sampling is not really accurate but it is more than enough to get an idea.
--
Francesco Romani
RedHat Engineering Virtualization R & D
Phone: 8261328
IRC: fromani
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------=_Part_233010_1164979986.1404119674471--
5:18 a.m.
----- Original Message -----
From: "Francesco Romani" <fromani(a)redhat.com>
To: devel(a)ovirt.org
Cc: "Nir Soffer" <nsoffer(a)redhat.com>, "Martin Sivak"
<msivak(a)redhat.com>
Sent: Monday, June 30, 2014 12:14:34 PM
Subject: Re: [ovirt-devel] XML benchmarks
----- Original Message -----
> From: "Francesco Romani" <fromani(a)redhat.com>
> To: "Nir Soffer" <nsoffer(a)redhat.com>
> Cc: devel(a)ovirt.org
> Sent: Monday, June 30, 2014 8:47:15 AM
> Subject: Re: [ovirt-devel] XML benchmarks
>
> ----- Original Message -----
> > From: "Nir Soffer" <nsoffer(a)redhat.com>
> > To: "Francesco Romani" <fromani(a)redhat.com>
> > Cc: devel(a)ovirt.org, "Martin Sivak" <msivak(a)redhat.com>
> > Sent: Sunday, June 29, 2014 10:34:08 AM
> > Subject: Re: [ovirt-devel] XML benchmarks
>
> > > CPU measurement: just opened a terminal and run 'htop' on it.
> > > CPU profile: clustered around the sampling interval. Usage negligible
> > > most
> > > of
> > > time, peak on sampling as shown below
> > >
> > > 300 VMs
> > > minidom: ~38% CPU
> > > cElementTree: ~5% CPU
> >
> > What is 38% - (38% of one core? how may cores are on the machine?)
>
> 4 cores: 2 physical, 2 logical. I'm prepping a more precise test
> using a better and less ambiguous indicator.
Here. Attached un updated script (xmlbench2.py) which uses 'psutil'
(https://pypi.python.org/pypi/psutil) to gather the samples.
CPU sampled each 500ms (half a second). 100% is one core.
My laptop reports 4 core (dualcore with hyperthreading).
See attached some graphs for easier comsumption and their gnuplot recipe.
cpu_300t_3m.png: load using the test script with 300 threads, each thread
runs ~3 minutes
cpu_500t_3m.png: load using the test script with 500 threads, each thread
runs ~3 minutes
sampling is not really accurate but it is more than enough to get an idea.
Nice!
10:41 a.m.
It's good to see us moving away from minidom.
I do think there is a place though to abstract out
common use cases so we are not tied to an API and that
we do the optimal thing more most use cases.
----- Original Message -----
From: "Francesco Romani" <fromani(a)redhat.com>
To: devel(a)ovirt.org
Sent: Friday, June 27, 2014 3:30:14 PM
Subject: [ovirt-devel] XML benchmarks
Hi,
Due to the recent discussion (http://gerrit.ovirt.org/#/c/28712/), and as
part
of the ongoing focus on scalability and performances
(http://gerrit.ovirt.org/#/c/17694/ and many others),
I took the chance to do a very quick and dirty bench to see how it really
cost
to do XML processing in sampling threads (thanks to Nir for the kickstart!),
and,
in general, how much the XML processing costs.
Please find attached the test script and the example XML
(real one made by VDSM master on my RHEL6.5 box).
On my laptop:
$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 58
Model name: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz
Stepping: 9
CPU MHz: 1359.375
CPU max MHz: 3600.0000
CPU min MHz: 1200.0000
BogoMIPS: 5786.91
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 4096K
NUMA node0 CPU(s): 0-3
8 GiBs of RAM, running GNOME desktop and the usual development stuff
xmlbench.py linuxvm1.xml MODE 300
MODE is either 'md' (minidom) or 'cet' (cElementTree).
This will run $NUMTHREADS threads fast and loose without synchronization.
We can actually have this behaviour if a customer just mass start VMs.
In general I expect some clustering of the sampling activity, not a nice
evenly interleaved
time sequence.
CPU measurement: just opened a terminal and run 'htop' on it.
CPU profile: clustered around the sampling interval. Usage negligible most of
time, peak on sampling as shown below
300 VMs
minidom: ~38% CPU
cElementTree: ~5% CPU
500 VMs
minidom: ~48% CPU
cElementTree: ~6% CPU
1000 VMs
python thread error :)
File "/usr/lib64/python2.7/threading.py", line 746, in start
_start_new_thread(self.__bootstrap, ())
thread.error: can't start new thread
I think this is another proof (if we need more of them) that
* we _really need_ to move away from the 1 thread per VM model ->
http://gerrit.ovirt.org/#/c/29189/ and friends! Let's fire up the
discussion!
* we should move to cElementTree anyway in the near future: faster
processing, scales better, nicer API.
It is also a pet peeve of mine, I do have some patches floating but we need
still some preparation work in the virt package.
--
Francesco Romani
RedHat Engineering Virtualization R & D
Phone: 8261328
IRC: fromani
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9 comments
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participants (5)
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Antoni Segura Puimedon -
Dan Kenigsberg -
Francesco Romani -
Nir Soffer -
Saggi Mizrahi