What would be the performance difference (reads/writes) between some C++ implementation of in-memory B-Tree (for example google btree) and the LMDB (without taking into consideration all the feacures of LMDB such as transactions, isolation, shared access etc.)?
What is special about internal design of LMDB?
3.7k views Asked by pavelkolodin At
1
There are 1 answers
Related Questions in LMDB
- Elixir/Phoenix Endpoint broadcast from another module
- Elixir Phoenix Restful to websocket API
- How can I get Phoenix to join channels automatically when a client connects?
- How to broadcast to one socket_id using phoenix
- Count open socket and channel connections in a Phoenix application
- Phoenix Channel can't maintain connection with frontend once the connection is established (Error during WebSocket handshake)
- How to setup a phoenix channel for say hundreds of topics?
- Connecting remote client to Phoenix channel
- Phoenix application on a fleet of machines
- Phoenix 1.4.0-dev generated channel test fails with compile error
Related Questions in OKVS
- Elixir/Phoenix Endpoint broadcast from another module
- Elixir Phoenix Restful to websocket API
- How can I get Phoenix to join channels automatically when a client connects?
- How to broadcast to one socket_id using phoenix
- Count open socket and channel connections in a Phoenix application
- Phoenix Channel can't maintain connection with frontend once the connection is established (Error during WebSocket handshake)
- How to setup a phoenix channel for say hundreds of topics?
- Connecting remote client to Phoenix channel
- Phoenix application on a fleet of machines
- Phoenix 1.4.0-dev generated channel test fails with compile error
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
Popular Tags
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
This 2014 lmdb design presentation by its architect Howard Chu covers the design and tradeoffs of
lmdb
.To summarize:
lmdb
is a copy-on-write, bottom-up updated, double-buffered, b-tree where the implementation always favors simplicity whenever it clashes with other considerations.The smart design choices make it one of the highest performance and corruption-resistant B-tree implementations out there.
lmdb
relies on the underlying OS for cachingObviously, these choices mean that
lmdb
is not friendly to complex scenarios such as:lmdb
favors simpler multiple readers and single writer schemesThere's much more in the full (over 100 pages) presentation. The above is just a summary of the spirit of
lmdb
.lmdb
is used as the core storage engine in prominent open source projects such as Open LDAP and Memcached and in both cases speed-ups of orders of magnitude have been observed compared to alternatives as can be seen in micro-benchmark results.