tight loop in tdb_find()
Stefan (metze) Metzmacher
metze at samba.org
Mon May 25 08:15:29 GMT 2009
Hi Tridge,
> 2) make gencache.tdb use TDB_CLEAR_IF_FIRST. Is that acceptable? Do
> we really need to be able to use cached data from previous runs of
> smbd?
We need to fill in the server affinity with net ads join and then use it
in winbindd later.
> 3) Add support for async transaction stores. We could use the forked
> child stuff we've discussed recently to allow for a transaction store
> to gencache.tdb to proceed while the parent continues.
>
> 4) Use a 2 level cache for gencache.tdb. The first level would use
> TDB_CLEAR_IF_FIRST and the 2nd level would use transactions. We'd
> keep a record in the first level that says how old the oldest record
> in that first level tdb is and how many records are in the first
> level. When those go past a threshold then we would do a single
> transaction to move them into the 2nd level cache. The downside is
> that gencache reads would involve two tdb_fetch() calls, but it would
> mean that the average cost of stores would be fast.
That would add a lot of complexity to gencache...
> Can you think of any other approaches to fix this?
No:-(
> Are there any other databases in Samba3 that are persistent and don't
> use transactions?
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