Hi all,
This patch added rocksdb support for ceph, enabled rocksdb for omap directory.
Rocksdb source code can be get from link. To use use rocksdb, C++11 standard
should be enabled, gcc version >= 4.7 is required to get C++11 support. Rocksdb
can be installed with instructions described in the INSTALL.md file, and
rocksdb header files (include/rocksdb/*) and library (librocksdb.so*) need to
be copied to corresponding directories.
To enable rocksdb, add "--with-librocksdb" option to configure. The rocksdb
branch is here(https://github.com/xinxinsh/ceph/tree/rocksdb).
Performance Test
Attached file is the performance comparison of rocksdb and leveldb on four
nodes with 40 osds, using 'rados bench' as the test tool. The performance
results is quite promising.
Any comments or suggestions are greatly appreciated.
Rados bench BandWidth(MB/s)
Average latency
Leveldb rocksdb Leveldb rocksdb
write 4 threads 263.762 272.549
0.061 0.059
write 8 threads 449.834 457.811
0.071 0.070
write 16 threads 642.100 638.972 0.100
0.100
write 32 threads 705.897 717.598 0.181
0.178
write 64 threads 705.011 717.204 0.370
0.362
read 4 threads 873.588 841.704
0.073 0.076
read 8 threads 816.699 818.451
0.078 0.078
read 16 threads 808.810 798.053 0.079
0.080
read 32 threads 798.394 802.796 0.080
0.080
read 64 threads 792.848 790.593 0.081
0.081
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