BushStore: Efficient B+Tree Group Indexing for LSM-Tree in Non-Volatile Memory.

        BushStore is an adaptive and horizontally scalable Log-Structured Merge-Tree for NVM storage that mitigates write and read amplifications. This web page hosts the code and data used in the paper titled "BushStore: Efficient B+Tree Group Indexing for LSM-Tree in Non-Volatile Memory".

Environment, Workloads and Evaluation

1. Environment

Our evaluation is based on the following configurations and versions, you can try others.

• Hardware configuration

[CPU] 18-core 2.60GHz Intel(R) Xeon(R) Gold 6240C CPUs with 24.75 MB cache * 2
[MEM] 2666MHz DDR4 DRAM (32GB * 12)
[NVM] 1.5TB Intel Optane DC PMMs (128GB * 12)
[SSD] INTEL SSDPEDME016T4F.

• Operating environment

[os] Ubuntu 20.04.4 LTS (GNU/Linux 5.4.0-155-generic x86_64)
[gcc] 9.4.0
[cmake] 3.22.0(>=3.9)
[snappy] 1.2.0
[ndctl]

2. Workloads

db_bench (BushStore/benchmarks/db_bench)
ycsb (BushStore/ycsbc)

3. Compilation

You can compile as follows, or just use the run_db_bench.sh script, which packages the complete compilation and testing process

1. Compiling the BushStore and db_bench tools

mkdir -p build && cd build
cmake -DCMAKE_BUILD_TYPE=Release .. && make

2. Compiling YCSB

cd ycsbc
make

4. Running

It is recommended to run the test directly using run_db_bench.sh, which presets the parameters used in our experiments. Or you can use the following way to test manually

• Microbenchmark

For example, to test the random read/write of 80G 1KB value size data, we use the following parameters

./db_bench --benchmarks=fillrandom,readrandom,readseq,stats --num=83886080 --value_size=1024 --write_buffer_size=67108864 --max_file_size=134217728 --open_files=10000 --reads=-1 --pm_size=193273528320 --pm_path=/mnt/pmem0.1/pm_test --db=/mnt/pmem0.1/pm_test --bucket_nums=33554432 --use_pm=1 --threads=1 --flush_ssd=0 --throughput=0 --dynamic_tree=1 --write_batch=1 --gc_ratio=0.5

• YCSB

For example, to test YCSBC with 1KB value size, you can use the following approach.

cd ycsbc
./ycsbc ./input/1KB_ALL

For specific YCSB runtime parameters, you can read and modify ycsbc/workloads, ycsbc/inputs, ycsbc/db/leveldb_db.cc

• Full Test

You can run run_db_bench.sh directly and it will generate the output directory in the BushStore directory, which contains the results of running all the tests for the paper

./run_db_bench.sh