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2i order of events

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When running a load of mainly 2i queries, there is a huge cost in the
previous snapshot code.  The time taken to create a clone of the
Penciller (duplicating all the LoopState) varied between 1 and 200ms
depedning on the size of the LoopState.

For 2i queries, most of that LoopState was then being thrown away after
running the query against the levelzero_cache.  This was taking < 1ms on
average.  It would be better to avoid the o(100)ms of CPU  burning and
block for o(1)ms - so th eorder of events have been changed ot filter
first so only the small part of the LoopState actually required is
copied to the clone.
This commit is contained in:
martinsumner 2017-03-06 18:42:32 +00:00
parent eb6f668fcd
commit c92107e4b4
5 changed files with 161 additions and 113 deletions
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5
src/leveled_inker.erl
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@ -711,10 +711,7 @@ filepath(CompactFilePath, NewSQN, compact_journal) ->
initiate_penciller_snapshot(Bookie) ->
{ok,
{LedgerSnap, LedgerCache},
_} = leveled_bookie:book_snapshotledger(Bookie, self(), undefined),
leveled_bookie:load_snapshot(LedgerSnap, LedgerCache),
{ok, LedgerSnap, _} = leveled_bookie:book_snapshotledger(Bookie, self(), undefined),
MaxSQN = leveled_penciller:pcl_getstartupsequencenumber(LedgerSnap),
{LedgerSnap, MaxSQN}.