Commit Graph

9 Commits

Author SHA1 Message Date
Gareth Andrew Lloyd
8bc8e867e4
Pmr allocator unify ()
Query allocator and evaluation allocator were different.
After analysis, was determined they should be the same, this will help 
future development reduce TypeValue copies during queries.

Changes:
- Common allocator, PoolResource backed by MonotonicResource
- Optimized Pool, now O(1) alloc/dealloc as all chunks in Pool form a single 
  free list
- 2nd PoolResource, using bin sizing, not as perfect for memory usage but 
  O(1) bin selection
- Now have jemalloc's background thread to make sure decay and return 
  to OS happens
- Optimized ProperyValue to be faster at destruction/copy/move
- Less temporary memory allocations
  - CSV reader now maintains a common line buffer it reuses on line reads
  - Writing out bolt values, now reuses a values buffer
  - Evaluating an int no longer makes temporary strings for errors it most 
    likely never throws
  - ExpandVariable will reuse existing edge list in frame it one existed
2024-03-14 11:21:59 -07:00
jbajic
12b4ec1589 Add memgraph namespace 2022-03-14 15:47:41 +01:00
János Benjamin Antal
e1f31d3d02
Toolchain v4 with fbthrift () 2022-01-18 12:51:27 +01:00
Antonio Andelic
bd21bc82b7
Add license to cpp/hpp/py test files () 2021-10-26 08:53:56 +02:00
antonio2368
3f3c55a4aa
Format all the memgraph and test source files () 2021-02-18 15:32:43 +01:00
antonio2368
4e7c569071 Migrate code to C++20 () 2020-11-17 11:03:08 +01:00
Teon Banek
023538c19c Add PoolResource benchmarking in execution and skiplist
Summary:
With a pool allocator, lookups in STL set and map are up to 50% faster.
This is probably due to contiguous memory of pooled objects, i.e. nodes
of those containers. In some cases, the lookup outperforms the SkipList.
Insertions are also faster, though not as dramatically, up to 30%. This
does make a significant difference when the STL containers are used in a
single thread as they outperform the SkipList significantly.

Reviewers: mferencevic, ipaljak

Reviewed By: mferencevic

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D2326
2019-08-27 09:32:01 +02:00
Teon Banek
a417ef36f1 Use MemoryResource in SkipList
Summary:
This is a preparation step in case we want to have a custom allocator in
SkipList. For example, pool based allocator for SkipListNode.
Introduction of MemoryResource and removal of `calloc` has reduced the
performance a bit according to micro benchmarks. This performance hit is
not visible on benchmarks which do more concurrent operations.

Reviewers: mferencevic, mtomic

Reviewed By: mferencevic

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D2140
2019-07-09 09:31:15 +02:00
Matej Ferencevic
1af728b505 Implement new SkipList
Reviewers: teon.banek, msantl, ipaljak

Reviewed By: teon.banek

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D1787
2019-01-14 13:01:15 +01:00