Re: [9fans] venti/fmtarenas approximate duration?

[andrey mirtchovski <mirtchov@cpsc.ucalgary.ca>]

On Tue, 24 Jun 2003, Sape Mullender wrote:

> echo dma on >/dev/sdCx/ctl
>
> will help a lot.
>
> Having said that, the initial snapshot of a 35 GB file system still took 40 hours
> (but everything -- fossil, arenas, index -- was on one disk (a temporary
> necessity to free up disk space elsewhere)).
>

following jmk's fix a fmtarenas on a 60gb arena took less than 30 minutes
(more like 15, don't have exact numbers). fmtisect on a 3.04Gb index
partition took about two minutes. this one i actually measured with iostats,
but the numbers are strange:


# iostats venti/fmtisect isect /dev/sdD0/isect
clearing the partition
configuring index section isect with space for index config bytes=65536

read      80863 bytes, 7.896778e+07 Kb/sec
write     3273810527 bytes, 3.197081e+12 Kb/sec
protocol  3287480890 bytes, 3.210431e+12 Kb/sec
rpc       399684 count

Message    Count   Low  High  Time Averg          in      out
version        1     0     0     0     0 ms       19       19 bytes
attach         1     0     0     0     0 ms       25       20 bytes
walk           9     0     0     0     0 ms      259      293 bytes
open           5     0     0     0     0 ms       60      120 bytes
read          21     0     0     0     0 ms      483    81094 bytes
write      399638     0     0     0     0 ms 3283002201  4396018 bytes
clunk          8     0     0     0     0 ms       88       56 bytes
stat           1     0     0     0     0 ms       11       81 bytes

Opens    Reads  (bytes)   Writes  (bytes) File
    1        0        0        2       95 (stderr)
    1        0        0   399636 3273810432 /dev/sdD0/isect
    1       21    80863        0        0 /bin/venti/fmtisect
#