Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Tue, 02 May 2017 17:43:34 +0200] rev 2309
obscache: skip writing to disk if the data did not changed
This will avoid rewriting the cache for every single transaction.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Tue, 02 May 2017 16:19:05 +0200] rev 2308
obscache: skip writing if the cache is empty
if the cache is empty, we can just skip writing to disk.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Tue, 02 May 2017 16:17:03 +0200] rev 2307
obscache: set a valid "empty" cache key if the cache is missing
This avoid detecting bad cache when it just happens to be no cache.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Tue, 02 May 2017 16:10:14 +0200] rev 2306
obscache: have the obsstore fix empty file cachekey
Before this change, the missing file and empty file returned different value.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Tue, 02 May 2017 17:44:12 +0200] rev 2305
obscache: log case where the cache is not up to date
This will help track performance issue
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Tue, 02 May 2017 16:13:04 +0200] rev 2304
obscache: still update and use the cache during transaction
Other code might access the obsolete set in the middle of a transaction. It is
better to use the case in that case since the update will eventually be written
when the transaction is committed.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Tue, 02 May 2017 16:15:01 +0200] rev 2303
obscache: warm the cache in all cases
There are case when the obsstore have been invalidated, but we still need to
update the cache.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Tue, 02 May 2017 16:11:43 +0200] rev 2302
obscache: update the format to allow negative tiprev
If the changelog is empty (but the obsstore is not) the 'tiprev' will be -1.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Tue, 02 May 2017 16:09:03 +0200] rev 2301
obscache: load the disk data before checking is the cache is up to date
This is actually required since non-loaded cache will never be up to date...
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Tue, 02 May 2017 02:13:33 +0200] rev 2300
obscache: skip the cache entirely if not up to date
The current update code has some race condition windows around updating. But we
also ensure the cache are up to date with every transaction. So outdated cache
mean another client have been mudding the repository but things will get back
in place at the next transaction.
So we just skip using the cache when not up to date. This is not the best we
could do. But this is good enough for now.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Mon, 01 May 2017 15:49:36 +0200] rev 2299
readme: mention that some improvement are enabled for 4.2 only
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Mon, 01 May 2017 08:12:26 +0200] rev 2298
perf: use the cache to compute the obsolete set.
The official "obsolete" computation is switch to using the cache. This provide
noticable speed for operation that does not need to actually access the
obs markers. The part relating to obsolete changeset computation disappear from
the execution profile when it is used.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Mon, 01 May 2017 08:14:00 +0200] rev 2297
perf: warm the cache after all transactions
This is the simplest way to ensure the data are up to date.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Mon, 01 May 2017 08:13:24 +0200] rev 2296
perf: adds a cache to know if obsmarkers might affect a revision
Phase information still needs to be thrown in the mix to compute the final
information, but skipping reading the obsstore for most operation is a large
win.
Usage of this cache arrives in the next changeset.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Mon, 01 May 2017 08:07:05 +0200] rev 2295
perf: adds cachekey utility to validate changelog+obsstore content
We adds more helper about cache key to prepare the arrival of a cache that can
be updated iteratively (similar to branchmap cache)