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ClickHouse® is a real-time analytics DBMS
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* Convert hashSets in parallel before merge Before merge, if one of the lhs and rhs is singleLevelSet and the other is twoLevelSet, then the SingleLevelSet will call convertToTwoLevel(). The convert process is not in parallel and it will cost lots of cycle if it cosume all the singleLevelSet. The idea of the patch is to convert all the singleLevelSets to twoLevelSets in parallel if the hashsets are not all singleLevel or not all twoLevel. I have tested the patch on Intel 2 x 112 vCPUs SPR server with clickbench and latest upstream ClickHouse. Q5 has got a big 264% performance improvement and 24 queries have got at least 5% performance gain. The overall geomean of 43 queries has gained 7.4% more than the base code. Signed-off-by: Jiebin Sun <jiebin.sun@intel.com> * add resize() for the data_vec in parallelizeMergePrepare() Signed-off-by: Jiebin Sun <jiebin.sun@intel.com> * Add the performance test prepare_hash_before_merge.xml Signed-off-by: Jiebin Sun <jiebin.sun@intel.com> * Fit the CI to rename the data set from hits_v1 to test.hits. Signed-off-by: Jiebin Sun <jiebin.sun@intel.com> * remove the redundant branch in UniqExactSet Co-authored-by: Nikita Taranov <nickita.taranov@gmail.com> * Remove the empty methods and add throw exception in parallelizeMergePrepare() Signed-off-by: Jiebin Sun <jiebin.sun@intel.com> --------- Signed-off-by: Jiebin Sun <jiebin.sun@intel.com> Co-authored-by: Nikita Taranov <nickita.taranov@gmail.com> |
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ClickHouse® is an open-source column-oriented database management system that allows generating analytical data reports in real-time.
How To Install (Linux, macOS, FreeBSD)
curl https://clickhouse.com/ | sh
Useful Links
- Official website has a quick high-level overview of ClickHouse on the main page.
- ClickHouse Cloud ClickHouse as a service, built by the creators and maintainers.
- Tutorial shows how to set up and query a small ClickHouse cluster.
- Documentation provides more in-depth information.
- YouTube channel has a lot of content about ClickHouse in video format.
- Slack and Telegram allow chatting with ClickHouse users in real-time.
- Blog contains various ClickHouse-related articles, as well as announcements and reports about events.
- Code Browser (Woboq) with syntax highlighting and navigation.
- Code Browser (github.dev) with syntax highlighting, powered by github.dev.
- Static Analysis (SonarCloud) proposes C++ quality improvements.
- Contacts can help to get your questions answered if there are any.
Upcoming Events
- v23.7 Release Webinar - Jul 27 - 23.7 is rapidly approaching. Original creator, co-founder, and CTO of ClickHouse Alexey Milovidov will walk us through the highlights of the release.
- ClickHouse Meetup in Boston - Jul 18
- ClickHouse Meetup in NYC - Jul 19
- ClickHouse Meetup in Toronto - Jul 20
- ClickHouse Meetup in Singapore - Jul 27
- ClickHouse Meetup in Paris - Sep 12
Also, keep an eye out for upcoming meetups around the world. Somewhere else you want us to be? Please feel free to reach out to tyler clickhouse com.
Recent Recordings
- Recent Meetup Videos: Meetup Playlist Whenever possible recordings of the ClickHouse Community Meetups are edited and presented as individual talks. Current featuring "Modern SQL in 2023", "Fast, Concurrent, and Consistent Asynchronous INSERTS in ClickHouse", and "Full-Text Indices: Design and Experiments"
- Recording available: v23.6 Release Webinar All the features of 23.6, one convenient video! Watch it now!
- All release webinar recordings: YouTube playlist
Interested in joining ClickHouse and making it your full-time job?
We are a globally diverse and distributed team, united behind a common goal of creating industry-leading, real-time analytics. Here, you will have an opportunity to solve some of the most cutting-edge technical challenges and have direct ownership of your work and vision. If you are a contributor by nature, a thinker and a doer - we’ll definitely click!
Check out our current openings here: https://clickhouse.com/company/careers
Cant find what you are looking for, but want to let us know you are interested in joining ClickHouse? Email careers@clickhouse.com!