Hi Josh, Wondering how this conclusion is deduced, could you please share the related experimental results, so that to estimate the potential performance gain Cheers, Li Wang 2018-03-28 9:43 GMT+08:00 Josh Durgin <jdurgin@xxxxxxxxxx>: > Hi Lisa, your presentation last week at Cephalocon was quite convincing. > > Recordings aren't available yet, so perhaps you can share your slides. > > For those who weren't there, Lisa tested many configurations of rocksdb > with bluestore to attempt to keep the pg log out of level 0 in rocksdb, > and thus avoid a large source of write amplification. > > None of these tunings were successful, so the conclusion was that the pg > log ought to be stored outside of rocksdb. > > Lisa, what are your thoughts on how to store the pg log? > > For historical reference, it was moved into leveldb originally to make > it easier to program against correctly [0], but the current PGLog code > has grown too complex despite that. > > Josh > > [0] > https://github.com/ceph/ceph/commit/1ef94200e9bce5e0f0ac5d1e563421a9d036c203 > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
