Hi Jens,
thanks for getting back to me.
I've rebuilt with the latest but I still see problems with the numbers.
I do see one improvement,
the "% done" printed while the test is in progress now increases nicely
from 0% to 100%
whereas before it would jump around to seemingly random values between
0% to 100%
I wonder is it picking the wrong set of numbers to print in some cases.
eg. from a test with 2 jobs that runs for 23 seconds I faound the
following in normal output ...
when run standalone on a 32-bit VM I see this for a "rw=randread" job
read : io=47106B, bw=2047B/s, iops=1023, runt= 23001msec
whereas when the same test is run from 64-bit client to 32-bit server I
see this for the same job
trim: io=98789GB, bw=1000/s, iops=0, runt=98784247808000msec
so it says "trim" where it should say "read"
and for the 2nd job which is "rw=write"
when run standalone on a 32-bit VM I see this
write: io=34502B, bw=1500B/s, iops=750, runt= 23001msec
whereas when the same test is run from 64-bit client to 32-bit server I
see this for the same job
read : io=148185GB, bw=1500/s, iops=750, runt=98788542775296msec
so it says "read" where it should say "write"
In the same test run, the following results are identical when run both
ways ...
Run status group 0 (all jobs):
READ: io=46KB, aggrb=1KB/s, minb=1KB/s, maxb=1KB/s, mint=23001msec,
maxt=23001msec
WRITE: io=33KB, aggrb=1KB/s, minb=1KB/s, maxb=1KB/s, mint=23001msec,
maxt=23001msec
so these results look correct.
All the above problems are only seen when run from 64-bit client to
32-bit server,
no problems seen when running standalone,
and no problems seen when running 64-bit client to 64-bit server.
Thanks,
Frank
On 27/06/2014 22:02, Jens Axboe wrote:
On 06/27/2014 10:47 AM, Jens Axboe wrote:
On 2014-06-27 01:00, Frank D'Arcy wrote:
Hi,
I've been playing around with fio (which is really great thanks)
with a view to testing hard disks on set-top boxes (which I don't have
yet)
and as prep for this I created a test environment consisting of
2 x virtual machines running 32-bit ubuntu (using "hashicorp/precise32"
from vagrant cloud)
running on a 64-bit machine with ubuntu 12.04.
I started fio (v2.1.10) running in server mode on both virtual machines
as follows
$ fio --server=,8880
and launched 2 fio (v2.1.10) instances in client mode on the host 64-bit
machine,
$ fio --client=ip:127.0.0.1,8882 test.fio
$ fio --client=ip:127.0.0.1,8881 test.fio
where ports 8881 and 8882 are forwarded to port 8880 on each VM
The sample test.fio (below) runs for 25 seconds
but the values printed by the clients look garbled.
eg. runtime is a huge number ("runt= 107374182400000msec")
Same issue is seen when I switched to using latest fio from "git clone"
and the same issue is seen with all output formats (json, terse, normal)
I changed one of the virtual machines to 64-bit ubuntu (using
"hashicorp/precise64" from vagrant cloud)
and the client talking to the fio server on that VM gave the correct
results (eg. "runt= 25001msec")
while the client talking to the 32-bit ubuntu VM continued to show
garbled values.
So it looks like support is not there for client-server setups on
non-matching architectures ?
eg. 32-bit client to 64-bit server in this case,
and perhaps endianess differences would be a problem too? ( but I
haven't tried that )
Apologies if I've missed this issue raised elsewhere, I did a quick
search and found no mention of it.
It's not critical for us, as the simple workaround is to run fio
standalone on each set-top box
outputting results to a file and pulling the file back to a central
machine for parsing.
Just wanted to raise it if its unknown to you.
Any mix of 32 vs 64-bit and big vs little endian should work, all the
data structures are sanitized across the wire. So if it doesn't work,
then that is surely a bug! I'll take a look at this.
http://git.kernel.dk/?p=fio.git;a=commit;h=819db5f5009742975cfdd036440522bd45b86fe7
this should make it behave better. Let me know if there are still issues
with 32 vs 64 bit client/server.
--
Frank D'Arcy
www.s3group.com
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