--blocksize bug?

--blocksize bug?

[Bill Broadley]

I downloaded 1.38, and then the 
http://brick.kernel.dk/snaps/fio-git-latest.tar.gz.  Both exhibited 
identical behavior.

Both built with no problems on a centos-5.4 x86-64 box.

REPORTING-BUGS mentioned cat .git/HEAD, so I'll report it:
ref: refs/heads/master

Goal:
   To benchmark randomly accessing a 1GB file with different blocksizes
   to see how blocksize effects bandwidth.

rand.fio:
[random-read]
rw=randread
size=128m # just enough to get the numbers
filesize=1G # make sure the seek distance is randomly over 1GB file
directory=/mnt/tmp
blocksize=1024k

BTW, the fio.1 page says:
   blocksize=int[,int], bs=int[,int]
      Block size for I/O units.  Default: 4k.  Values  for  reads  and
      writes  can  be  specified  seperately in the format read,write,
      either of which may be empty to leave that value at its default.

BTW, that should be separately not "seperately"

So since I wanted to vary the blocksize I figured I'd do it on the 
command line so I said:
./fio --showcmd ~/rand.fio
fio --name=random-read --rw=randread --size=128m --filesize=1G 
--directory=/mnt/tmp --blocksize=1024k

To I tried to run it:
./fio --name=random-read --rw=randread --size=128m --filesize=1G 
--directory=/mnt/tmp --blocksize=1024k
./fio: unrecognized option `--blocksize=1024k'

I tried to use the config file except for the blocksize.  I deleted the 
blocksize= line from rand.fio and:
./fio --blocksize=1m  ~/rand.fio
./fio: unrecognized option `--blocksize=1m'

Potential fixes:
1) fix showcmd to report a different flag for setting --blocksize
2) fix fio to accept --blocksize

Expected behavior:
I expected ./fio ~/rand.fio to work exactly like the arguments reported 
by ./fio --showcmd.

Re: --blocksize bug?

[Jens Axboe]

On Tue, Apr 13 2010, Bill Broadley wrote:
>
> I downloaded 1.38, and then the  
> http://brick.kernel.dk/snaps/fio-git-latest.tar.gz.  Both exhibited  
> identical behavior.
>
> Both built with no problems on a centos-5.4 x86-64 box.
>
> REPORTING-BUGS mentioned cat .git/HEAD, so I'll report it:
> ref: refs/heads/master
>
> Goal:
>   To benchmark randomly accessing a 1GB file with different blocksizes
>   to see how blocksize effects bandwidth.
>
> rand.fio:
> [random-read]
> rw=randread
> size=128m # just enough to get the numbers
> filesize=1G # make sure the seek distance is randomly over 1GB file
> directory=/mnt/tmp
> blocksize=1024k
>
> BTW, the fio.1 page says:
>   blocksize=int[,int], bs=int[,int]
>      Block size for I/O units.  Default: 4k.  Values  for  reads  and
>      writes  can  be  specified  seperately in the format read,write,
>      either of which may be empty to leave that value at its default.
>
> BTW, that should be separately not "seperately"

Thanks, will fix that.

> So since I wanted to vary the blocksize I figured I'd do it on the  
> command line so I said:
> ./fio --showcmd ~/rand.fio
> fio --name=random-read --rw=randread --size=128m --filesize=1G  
> --directory=/mnt/tmp --blocksize=1024k
>
> To I tried to run it:
> ./fio --name=random-read --rw=randread --size=128m --filesize=1G  
> --directory=/mnt/tmp --blocksize=1024k
> ./fio: unrecognized option `--blocksize=1024k'
>
> I tried to use the config file except for the blocksize.  I deleted the  
> blocksize= line from rand.fio and:
> ./fio --blocksize=1m  ~/rand.fio
> ./fio: unrecognized option `--blocksize=1m'
>
> Potential fixes:
> 1) fix showcmd to report a different flag for setting --blocksize
> 2) fix fio to accept --blocksize
>
> Expected behavior:
> I expected ./fio ~/rand.fio to work exactly like the arguments reported  
> by ./fio --showcmd.

And it should, apparently the alias names are not duped to the command
line options. I have fixed this up now, if you download the latest
snapshot it should work.

http://brick.kernel.dk/snaps/fio-git-latest.tar.gz

-- 
Jens Axboe