Roy, This is really helpful. So as your description, for each ops/seconds, I can use avgcount/sum. Is this the same value as "ceph osd perf"?
osd fs_commit_latency(ms) fs_apply_latency(ms) 0 23 85 1 2 2 2 32 36 Best Regards -- Ray On Mon, Jul 6, 2015 at 2:23 AM, Somnath Roy <somnath....@sandisk.com> wrote: > Hi Ray, > > Here is the description of the different latencies under filestore perf > counters. > > > > Journal_latency : > > ---------------------- > > > > This is the latency of putting the ops in journal. Write is acknowledged > after that (well a bit after that, there is one context switch after this). > > > > commitcycle_latency: > > -------------------------- > > > > Filestore backend while carrying out transaction, do a buffered write. In > a separate thread it does call syncfs() to persist the data to the disk and > update the persistent commit number in a separate file. This thread runs by > default 5 sec interval. > > This latency measures the time taken to carry out this job after the timer > expires i.e the actual persisting cycle. > > > > apply_latency: > > ---------------- > > > > This is the entire latency till the transaction finishes i.e journal write > + transaction time. It will do a buffer write here. > > > > queue_transaction_latency_avg: > > ---------------------------------------- > > This is the latency of putting the op in the journal queue. This will give > you an idea how much throttling is going on at the first place. This > depends on the following two parameters if you are using XFS. > > > > filestore_queue_max_ops > > filestore_queue_max_bytes > > > > > > All the latency numbers are represented by avgcount(number of ops within > this range) and the sum (which is total latency in second). Sum/avgcount > will give you an idea the latency per op. > > > > Hope this is helpful, > > > > Thanks & Regards > > Somnath > > > > > > *From:* ceph-users [mailto:ceph-users-boun...@lists.ceph.com] *On Behalf > Of *Ray Sun > *Sent:* Sunday, July 05, 2015 7:28 AM > *To:* ceph-users@lists.ceph.com > *Subject:* [ceph-users] Meanning of ceph perf dump > > > > Cephers, > > Is there any documents or code definition to explain ceph perf dump? I am > a little confusing about the output, for example, under filestore, there's > journal_latency and apply_latency and each of them has avgcount and sum. I > am not quite sure what's the unit and meaning of the numbers? How can I use > these numbers to tuning my ceph cluster. Thanks a lot. > > > > "filestore": { > > "journal_queue_max_ops": 300, > > "journal_queue_ops": 0, > > "journal_ops": 35893, > > "journal_queue_max_bytes": 33554432, > > "journal_queue_bytes": 0, > > "journal_bytes": 20579009432, > > "journal_latency": { > > "avgcount": 35893, > > "sum": 1213.560761279 > > }, > > "journal_wr": 34228, > > "journal_wr_bytes": { > > "avgcount": 34228, > > "sum": 20657713152 > > }, > > "journal_full": 0, > > "committing": 0, > > "commitcycle": 3207, > > "commitcycle_interval": { > > "avgcount": 3207, > > "sum": 16157.379852152 > > }, > > "commitcycle_latency": { > > "avgcount": 3207, > > "sum": 121.892109010 > > }, > > "op_queue_max_ops": 50, > > "op_queue_ops": 0, > > "ops": 35893, > > "op_queue_max_bytes": 104857600, > > "op_queue_bytes": 0, > > "bytes": 20578506930, > > "apply_latency": { > > "avgcount": 35893, > > "sum": 1327.974596287 > > }, > > "queue_transaction_latency_avg": { > > "avgcount": 35893, > > "sum": 0.025993727 > > } > > }, > > > > Best Regards > -- Ray > > ------------------------------ > > PLEASE NOTE: The information contained in this electronic mail message is > intended only for the use of the designated recipient(s) named above. If > the reader of this message is not the intended recipient, you are hereby > notified that you have received this message in error and that any review, > dissemination, distribution, or copying of this message is strictly > prohibited. If you have received this communication in error, please notify > the sender by telephone or e-mail (as shown above) immediately and destroy > any and all copies of this message in your possession (whether hard copies > or electronically stored copies). > >
_______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
