Rhizome database locked ==> MDP packets delays

[®om]

Sometimes, Rhizome prints this kind of trace:
rhizome_database.c:1606:rhizome_is_bar_interesting()  query failed (5), database is locked: SELECT id, version FROM manifests WHERE id like ? and version >= ?

Just after that, I see a lot of buffer underrun in my walkie-talkie (packets arrive in late, then audio communication don't work), with a quite huge delay: MDP packets seem "blocked" when rhizome is blocked. If I don't use Rhizome for sharing anything and only use the walkie-talkie, it works.

Are Rhizome sql access in the same thread as the one handling MDP packets?

What do you think?

[Jeremy Lakeman]

Yes, this is a known problem. We need to shift rhizome out of the main serval packet routing thread. And we need to implement an efficient synchronisation protocol so we don't have to keep checking if content is new & interesting.

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[Andrew Bettison]

See serval-dna issue #1.

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Andrew Bettison
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[®om]

Reference to a Rhizome parallelization implementation: https://github.com/servalproject/serval-dna/pull/68

[Paul Gardner-Stephen]

Hi Rom,

I am sure Jeremy has more to add, but we have been planning to separate Rhizome out for a while.  I think in the longer term we want to put it in a separate process to avoid residual inter-thread locks, but this is great to see.

Paul.

On Mon, Aug 12, 2013 at 9:04 PM, ®om <romain...@gmail.com> wrote:

Reference to a Rhizome parallelization implementation: https://github.com/servalproject/serval-dna/pull/68

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