[Ocfs2-users] Slow OCFS2 file creation / how to make ocfs2 generally faster?

[Stefan Priebe - Profihost AG]

> On 08/24/2011 09:56 PM, Stefan Priebe - Profihost AG wrote:
>>
>> ok here is a new complete test with values before and after and all
>> bonnie details.
>>
>> File creation and seq. delete drops again massively.
>>
>
> Version 1.96 ------Sequential Output------ --Sequential Input- --Random-
> Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
> Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
> server123-han 16G 519 99 113505 22 44504 8 2601 99 97508 6 1241 18 1node
> server123-han 16G 441 99 113301 23 45351 6 2641 99 102175 6 1158 16 2node
> server123-han 16G 1715 98 117309 6 47932 4 4656 98 141380 7 796.2 24 xfs
>
>
> Version 1.96 ------Sequential Create------ --------Random Create--------
> server123-han -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
> files:max /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
> 1024:32768:0/1024 3147 75 437 10 1670 23 3145 76 68 1 197 2 1node
> 1024:32768:0/1024 569 39 178 7 866 20 556 39 63 3 183 4 2node
> 1024:32768:0/1024 2611 27 873 5 8528 76 2604 27 93 0 3875 51 xfs
>
>
> Yes, there is a drop in creates. Creates are a bit heavy on cluster
> locks. There
> is scope for improvement at our end.
>
> Read/writes are fairly stable though.
>
> Unfortunately, I've forgotten your original qs.
Yes my question was if it is really correct that creates and deletes are 
dropping so significantly and that the deletes are low in relationship 
to xfs.

Creates dropping from 3147 to 569 that's 81% slower.
Reads dropping from 437 to 178 that's 59 slower%.

Delete are generelly a lot slower than with xfs. 8528 vs 866 that's 90% 
slower.

I was wondering that the impact is so high and couldn't believe that 
this is correct.

Thanks!

Stefan