Commit Graph

9 Commits

Author SHA1 Message Date
Alexander Neumann 9c55e8d69c Merge pull request #1549 from MJDSys/more_index_lookup_avoids
More optimizations to avoid calling Index.Lookup()
2018-01-24 20:53:30 +01:00
Igor Fedorenko 0084e42cb6 Optimize Repository.ListPack()
Use pack file size returned by Backend.List() to avoid extra per-pack
Backend.Stat() requests

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
2018-01-23 22:39:51 -05:00
Matthew Dawson df2c03a6a4
repository/master_index: Optimize Index.Lookup()
When looking up a blob in the master index, with several
indexes present in the master index, a significant amount of time
is spent generating errors for each failed lookup.  However, these
errors are often used to check if a blob is present, but the contents
are not inspected making the overhead of the error not useful.

Instead, change Index.Lookup (and Index.LookupSize) to instead return
a boolean denoting if the blob was found instead of an error.  Also change
all the calls to these functions to handle the new function signature.

benchmark                                            old ns/op     new ns/op     delta
BenchmarkMasterIndexLookupSingleIndex-6              820           897           +9.39%
BenchmarkMasterIndexLookupMultipleIndex-6            12821         2001          -84.39%
BenchmarkMasterIndexLookupSingleIndexUnknown-6       5378          492           -90.85%
BenchmarkMasterIndexLookupMultipleIndexUnknown-6     17026         1649          -90.31%

benchmark                                            old allocs     new allocs     delta
BenchmarkMasterIndexLookupSingleIndex-6              9              9              +0.00%
BenchmarkMasterIndexLookupMultipleIndex-6            59             19             -67.80%
BenchmarkMasterIndexLookupSingleIndexUnknown-6       22             6              -72.73%
BenchmarkMasterIndexLookupMultipleIndexUnknown-6     72             16             -77.78%

benchmark                                            old bytes     new bytes     delta
BenchmarkMasterIndexLookupSingleIndex-6              160           160           +0.00%
BenchmarkMasterIndexLookupMultipleIndex-6            3200          240           -92.50%
BenchmarkMasterIndexLookupSingleIndexUnknown-6       1232          48            -96.10%
BenchmarkMasterIndexLookupMultipleIndexUnknown-6     4272          128           -97.00%
2018-01-23 22:25:56 -05:00
Alexander Neumann 59782e347c repository: Fix repack test
This reduces the chance of duplicate blobs, otherwise the tests fail
(make the contents of a blob depend on a pseudo-random number instead of
the size, sizes may be duplicate).
2018-01-23 23:14:05 +01:00
Alexander Neumann b0c6e53241 Fix calls to repo/backend.List() everywhere 2018-01-21 21:15:09 +01:00
George Armhold d886cb5c27 replace ad-hoc context.TODO() with gopts.ctx, so that cancellation
can properly trickle down from cmd_*.

gh-1434
2017-12-03 07:22:14 -05:00
Alexander Neumann 23c903074c Move restic package to internal/restic 2017-07-24 17:43:32 +02:00
Alexander Neumann 6caeff2408 Run goimports 2017-07-23 14:21:03 +02:00
Alexander Neumann 83d1a46526 Moves files 2017-07-23 14:19:13 +02:00
Renamed from src/restic/repository/repack_test.go (Browse further)