[ovs-dev] [PATCH] OVN python IDL: avoid useless JSON conversion to enhance performance

Ben Pfaff blp at ovn.org
Wed Jun 13 15:20:06 UTC 2018


OK, I crossported to branch-2.9.

On Wed, Jun 13, 2018 at 01:24:44PM +0200, Miguel Angel Ajo Pelayo wrote:
> Ben, Russell, could we get this down to ovs 2.9?
> 
> It's very important for scale.
> 
> Best regards,
> Miguel Ángel.
> 
> On Wed, Jun 13, 2018 at 1:13 PM Daniel Alvarez Sanchez <dalvarez at redhat.com>
> wrote:
> 
> > Hi,
> > Bringing this up again.
> > Can we please get this backported into 2.9 branch? The enhancement is very
> > noticeable.
> > Thanks a lot!
> > Daniel
> >
> > On Tue, Mar 6, 2018 at 5:09 PM, Lucas Alvares Gomes <lucasagomes at gmail.com
> > > wrote:
> >
> >> Hi,
> >>
> >> Excellent investigative work here Daniel, thanks for that!
> >>
> >> On Wed, Feb 28, 2018 at 9:37 AM, Miguel Angel Ajo Pelayo
> >> <majopela at redhat.com> wrote:
> >> > And if we can get backports down the lane, that'd be great :)
> >> >
> >>
> >> +1 for backporting it. The changes seems straight forward to do so.
> >>
> >> > On Wed, Feb 28, 2018 at 9:37 AM Miguel Angel Ajo Pelayo <
> >> majopela at redhat.com>
> >> > wrote:
> >> >
> >> >> Acked-by: Miguel Angel Ajo <majopela at redhat.com>
> >> >>
> >> >> On Wed, Feb 28, 2018 at 9:13 AM Daniel Alvarez Sanchez <
> >> >> dalvarez at redhat.com> wrote:
> >> >>
> >> >>> Thanks Terry and Han for the reviews!
> >> >>> I removed the 'OVN' keyword from the title and submitted a v2:
> >> >>> [PATCH v2] python: avoid useless JSON conversion to enhance
> >> performance
> >> >>>
> >> >>> Thanks again.
> >> >>> Daniel
> >> >>>
> >> >>> On Wed, Feb 28, 2018 at 12:41 AM, Han Zhou <zhouhan at gmail.com> wrote:
> >> >>>
> >> >>> > Great catch!
> >> >>> > This patch is generic and not only for OVN, so I suggest to remove
> >> the
> >> >>> > "OVN" keyword in commit title.
> >> >>> >
> >> >>> > Acked-by: Han Zhou <hzhou8 at ebay.com>
> >> >>> >
> >> >>> > On Tue, Feb 27, 2018 at 12:44 PM, Terry Wilson <twilson at redhat.com>
> >> >>> wrote:
> >> >>> >
> >> >>> >> On Tue, Feb 27, 2018 at 9:25 AM, Daniel Alvarez <
> >> dalvarez at redhat.com>
> >> >>> >> wrote:
> >> >>> >> > This patch removes a useless conversion to/from JSON in the
> >> >>> >> > processing of any 'modify' operations inside the process_update2
> >> >>> >> > method in Python IDL implementation.
> >> >>> >> >
> >> >>> >> > Previous code will make resources creation take longer as the
> >> number
> >> >>> >> > of elements in the row grows because of that JSON conversion.
> >> This
> >> >>> >> > patch eliminates it and now the time remains consant regardless
> >> >>> >> > of the database contents improving performance and scaling.
> >> >>> >> >
> >> >>> >> > Reported-by: Daniel Alvarez Sanchez <dalvarez at redhat.com>
> >> >>> >> > Reported-at: https://mail.openvswitch.org/p
> >> >>> >> ipermail/ovs-discuss/2018-February/046263.html
> >> >>> >> > Signed-off-by: Daniel Alvarez <dalvarez at redhat.com>
> >> >>> >> > ---
> >> >>> >> >  python/ovs/db/idl.py | 12 +++++-------
> >> >>> >> >  1 file changed, 5 insertions(+), 7 deletions(-)
> >> >>> >> >
> >> >>> >> > diff --git a/python/ovs/db/idl.py b/python/ovs/db/idl.py
> >> >>> >> > index 60548bcf5..5a4d129c0 100644
> >> >>> >> > --- a/python/ovs/db/idl.py
> >> >>> >> > +++ b/python/ovs/db/idl.py
> >> >>> >> > @@ -518,10 +518,8 @@ class Idl(object):
> >> >>> >> >              if not row:
> >> >>> >> >                  raise error.Error('Modify non-existing row')
> >> >>> >> >
> >> >>> >> > -            old_row_diff_json = self.__apply_diff(table, row,
> >> >>> >> > -
> >> >>> row_update['modify'])
> >> >>> >> > -            self.notify(ROW_UPDATE, row,
> >> >>> >> > -                        Row.from_json(self, table, uuid,
> >> >>> >> old_row_diff_json))
> >> >>> >> > +            old_row = self.__apply_diff(table, row,
> >> >>> >> row_update['modify'])
> >> >>> >> > +            self.notify(ROW_UPDATE, row, Row(self, table, uuid,
> >> >>> >> old_row))
> >> >>> >> >              changed = True
> >> >>> >> >          else:
> >> >>> >> >              raise error.Error('<row-update> unknown operation',
> >> >>> >> > @@ -584,7 +582,7 @@ class Idl(object):
> >> >>> >> >                          row_update[column.name] =
> >> >>> >> self.__column_name(column)
> >> >>> >> >
> >> >>> >> >      def __apply_diff(self, table, row, row_diff):
> >> >>> >> > -        old_row_diff_json = {}
> >> >>> >> > +        old_row = {}
> >> >>> >> >          for column_name, datum_diff_json in
> >> six.iteritems(row_diff):
> >> >>> >> >              column = table.columns.get(column_name)
> >> >>> >> >              if not column:
> >> >>> >> > @@ -601,12 +599,12 @@ class Idl(object):
> >> >>> >> >                            % (column_name, table.name, e))
> >> >>> >> >                  continue
> >> >>> >> >
> >> >>> >> > -            old_row_diff_json[column_name] =
> >> >>> >> row._data[column_name].to_json()
> >> >>> >> > +            old_row[column_name] = row._data[column_name].copy()
> >> >>> >> >              datum = row._data[column_name].diff(datum_diff)
> >> >>> >> >              if datum != row._data[column_name]:
> >> >>> >> >                  row._data[column_name] = datum
> >> >>> >> >
> >> >>> >> > -        return old_row_diff_json
> >> >>> >> > +        return old_row
> >> >>> >> >
> >> >>> >> >      def __row_update(self, table, row, row_json):
> >> >>> >> >          changed = False
> >> >>> >> > --
> >> >>> >> > 2.13.5
> >> >>> >> >
> >> >>> >> > _______________________________________________
> >> >>> >> > dev mailing list
> >> >>> >> > dev at openvswitch.org
> >> >>> >> > https://mail.openvswitch.org/mailman/listinfo/ovs-dev
> >> >>> >>
> >> >>> >> +1
> >> >>> >>
> >> >>> >> This passes all of the functional tests in ovsdbapp when applied.
> >> Nice
> >> >>> >> find!
> >> >>> >>
> >> >>> >> Terry
> >> >>> >> _______________________________________________
> >> >>> >> dev mailing list
> >> >>> >> dev at openvswitch.org
> >> >>> >> https://mail.openvswitch.org/mailman/listinfo/ovs-dev
> >> >>> >>
> >> >>> >
> >> >>> >
> >> >>> _______________________________________________
> >> >>> dev mailing list
> >> >>> dev at openvswitch.org
> >> >>> https://mail.openvswitch.org/mailman/listinfo/ovs-dev
> >> >>>
> >> >>
> >> > _______________________________________________
> >> > dev mailing list
> >> > dev at openvswitch.org
> >> > https://mail.openvswitch.org/mailman/listinfo/ovs-dev
> >>
> >
> >


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