[ovs-dev] [PATCH v2] python: idl: Avoid pre-allocating column defaults

Ilya Maximets i.maximets at ovn.org
Tue Nov 30 00:32:47 UTC 2021

On 11/5/21 15:13, Terry Wilson wrote:
> Many python implementations pre-allocate space for multiple
> objects in empty dicts and lists. Using a custom dict-like object
> that only generates these objects when they are accessed can save
> memory.
> On a fairly pathological case where the DB has 1000 networks each
> with 100 ports, with only 'name' fields set, this saves around
> 300MB of memory.
> One could argue that if values are not going to change from their
> defaults, then users should not be monitoring those columns, but
> it's also probably good to not waste memory even if user code is
> sub-optimal.
> Signed-off-by: Terry Wilson <twilson at redhat.com>
> ---
>  python/ovs/db/idl.py | 39 +++++++++++++++++++++++++++++++++------
>  1 file changed, 33 insertions(+), 6 deletions(-)

Thanks, Terry, Dumitru and Flavio!  Applied.

Best regards, Ilya Maximets.

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