Hi Sijie, Thanks, One of my result is entrysize: 1k Throttle: 10k Latency is 1324.1137182178 ms I also profile the time and find that the ledger device can contribute 232 ms.
I don't think the ledger device should cause any cost. Jialin On Tue, Aug 26, 2014 at 10:59 AM, Sijie Guo <[email protected]> wrote: > The latency I think is between the client added the message and received > acknowledge from quorum of bookies. Journal device will significantly > affect the latency, Ledger device might slightly affect but not too much > (it depends). If you are using only one disk for both ledger & journal > devices, you will definitely get really bad disk behavior. > > At the mean time, your configuration on bookie journal (e.g. group commit > interval, commit buffer) will also affect the latency. > > So for your case, please specify your environment and configuration, we > will figure out why it takes to 2s. > > - Sijie > > > On Tue, Aug 26, 2014 at 8:27 AM, Jaln <[email protected]> wrote: > > > Hi, > > I'm running the bookkeeper benchmark on a single node, > > The latency is about 2s using one disk. > > I would like to know how this latency is calculated, > > is the `latency' the time between "client sent the write msg" and the > > "write is committed on the journal devices and the ack code is returned"? > > > > Does the ledger device affect the latency? Assuming ledger and journal is > > on > > different disk. > > > > Best, > > Jialin > > >
