Summary:
Added an option for readrandom benchmark to run with tailing iterator instead of Get. Benefit of tailing iterator is that it doesn't require locking DB mutex on access.
I also have some results when running on my machine. The results highly depend on number of cache shards. With our current benchmark setting of 4 table cache shards and 6 block cache shards, I don't see much improvements of using tailing iterator. In that case, we're probably seeing cache mutex contention.
Here are the results for different number of shards
cache shards tailing iterator get
6 1.38M 1.16M
10 1.58M 1.15M
As soon as we get rid of cache mutex contention, we're seeing big improvements in using tailing iterator vs. ordinary get.
Test Plan: ran regression test
Reviewers: dhruba, haobo, ljin, kailiu, sding
Reviewed By: haobo
CC: tnovak
Differential Revision: https://reviews.facebook.net/D15867
Summary:
Added readwhilewriting benchmark to our regression tests.
Changed block cache shards from 16 to 64, as Mark found that cache mutex contention is a big bottleneck.
Test Plan: Ran it.
Reviewers: dhruba, haobo, MarkCallaghan, xjin
Reviewed By: MarkCallaghan
CC: leveldb
Differential Revision: https://reviews.facebook.net/D15075
Summary: @MarkCallaghan's tests indicate that performance with 8k rows in memtable is much worse than empty memtable. I wanted to add a regression tests that measures this effect, so we could optimize it. However, current config shows 634461 QPS on my devbox. Mark, any idea why this is so much faster than your measurements?
Test Plan: Ran the regression test.
Reviewers: MarkCallaghan, dhruba, haobo
Reviewed By: MarkCallaghan
CC: leveldb, MarkCallaghan
Differential Revision: https://reviews.facebook.net/D14511
Branch detection did not work in Jenkins. I realized that it set
GIT_BRANCH env variable to point to the current branch, so let's try
using this for branch detection.
Summary: When running regression tests on other branches, this will push values to entity rocksdb_build.$git_branch
Test Plan: Ran regression test on regression branch, observed values send to ODS in entity rocksdb_build.regression
Reviewers: kailiu
Reviewed By: kailiu
CC: leveldb
Differential Revision: https://reviews.facebook.net/D14493
Summary: Added readrandom benchmark with 300MB block cache, while database has 1GB of data
Test Plan: Ran it
Reviewers: dhruba, MarkCallaghan
Reviewed By: dhruba
CC: leveldb
Differential Revision: https://reviews.facebook.net/D14373
Summary: The old regression tests didn't cover memtable part at all. This is an atempt to also measure memtable performance in regression tests.
Test Plan: Ran regression_build_test.sh
Reviewers: dhruba, haobo, kailiu, emayanke
Reviewed By: dhruba
CC: leveldb, reconnect.grayhat
Differential Revision: https://reviews.facebook.net/D14325
Summary: As Aaron suggested, there are quite some problems with our Makefile and scripts. So in this diff I did some cleanup for them and revise some part of the scripts/makefile to help people better understand some mysterious parts.
Test Plan:
Ran make in several modes;
Ran the updated scripts.
Reviewers: dhruba, emayanke, akushner
Differential Revision: https://reviews.facebook.net/D12285
