[tahoe-dev] how to see performance numbers (Re: linuxpal updated)
gdt at ir.bbn.com
Tue Oct 5 18:53:13 UTC 2010
"Zooko O'Whielacronx" <zooko at zooko.com> writes:
> To see how quickly a server responded to some requests, go to the
> welcome page of a gateway (e.g. http://pubgrid.tahoe-lafs.org/ ) and
> click on "Recent Uploads and Downloads", e.g.
> http://pubgrid.tahoe-lafs.org/status/ . Then choose a recent
> operations and click on it. If that server participated in that
> request then you'll see timings for that server's behavior.
Thanks. I think the stats could use some spiffing up, but I'm not sure
I get it so I'll put my thoughts in email before ticketing.
I have a main directory aliased to tahoe: on all client machines. It
contains (recursively) 4 directories and 7 files. I have been doing
deep check verify/repair/add-lease and losing. So I kicked off a deep
check and this operation stalled. I waited for it to finish and got the
Mutable File Servermap Update Status
* Started: 13:52:02 05-Oct-2010
* Finished: 14:00:24 05-Oct-2010
* Storage Index: [redacted]
* Helper?: No
* Progress: 100.0%
* Status: Finished
o Total: 8 minutes
+ Initial Queries: 54ms
+ Cumulative Verify: 4.5ms
o Per-Server Response Times:
+ [lwlukwtw]: 104ms
+ [nszizgf5]: 41ms
+ [pnxevooc]: 94ms
+ [sp26qyqc]: 76ms
+ [sroojqcx]: 357ms
+ [tavrk54e]: 314ms
+ [varyf6dy]: 190ms
+ [xflgj7cg]: 142ms
+ [4rk5oqd7]: 484ms
+ [5ouv6kib]: 311ms
So one server didn't answer, and the operation timed out after 8 minutes.
Things that would help:
show servers that are pending in the list, and perhaps put the time so
far. at end, leave the servers that didn't respond and make that clearer.
instead of "Finished: not yet", put "Finished: not yet as of TIME (delta)".
in 'recent operations', show either total time if complete, or time so
far in italics or bold, so one can find things that take a long time.
when done/failed, don't remove the 'sending 12 queries' info -- but
showing non-responding servers would avoid the need
scoreboard servers for latency and whether they are working well, and
show this in the welcome page per server
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