[augeas-devel] Match operations over long file too slow

[Štěpán Balážik]

Hi,

we want to use Augeas to programmatically parse and generate tests for 
Deckard <https://gitlab.labs.nic.cz/knot/deckard>[1] (our test harness 
for DNS resolvers).

I wrote a lens 
<https://gitlab.labs.nic.cz/knot/deckard/blob/augeas_wip/pydnstest/deckard.aug>[2] 
which works fine but on longer config files such as this one 
<https://gitlab.labs.nic.cz/knot/deckard/blob/augeas_wip/sets/resolver/iter_badraw.rpl>[3] 
the match operation on /scenario/step nodes takes about 3 ms per call on 
my machine using both augtool and the python binding. This sums up to 
over 10 s for the whole file which too slow for our purposes.

We have no idea what is the cause of this slowness. Are Augeas matches 
always so slow on "shallow and wide" trees?

Thanks in advance for any help.
Štěpán Balážik @ CZ.NIC

[1] https://gitlab.labs.nic.cz/knot/deckard
[2] 
https://gitlab.labs.nic.cz/knot/deckard/blob/augeas_wip/pydnstest/deckard.aug
[3] 
https://gitlab.labs.nic.cz/knot/deckard/blob/augeas_wip/sets/resolver/iter_badraw.rpl

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