[OpenAFS] Extremely poor write performance.

[Rubino Geiß]

> Paul Blackburn <mpb@est.ibm.com> writes:
> You describe what an admin would judge AFS on:

Yes, and that is a problem, for the user, but reflects back to the admin so
its getting his problem!

> 
> > What would be more interesting than a single-server:single-client 
> > comparison  is to look at how performance varies as the number of 
> > clients increases.
> 
> Well, I am just wondering: What about concentrating "an 
> increasing number of clients" on a single machine?
> 
> Practically speaking: What happens if you drastically 
> increase the number of afsd daemons (to say 300 instead 
> default of 3 for "Medium" in the /etc/sysconfig/afs file)?
> 
> How does this affect the "delete 10000 small files" performance? 
> 
> Robin and Rubino, could you try this and report, please ? 

############### daemons = 3

Version  1.03       ------Sequential Output------ --Sequential Input-
--Random-
                    -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
i44pc56.info.u 128M  1981  54  4211  12  3494  14  2917  78 38557  50 676.5
6
                    ------Sequential Create------ --------Random
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec
%CP
                 16    97  45   840  89   187  42   103  47   531  72   177
24
i44pc56.info.uni-karlsruhe.de,128M,1981,54,4211,12,3494,14,2917,78,38557,50,
676.5,6,16,97,45,840,89,187,42,103,47,531,72,177,24

############### daemons = 300

Version  1.03       ------Sequential Output------ --Sequential Input-
--Random-
                    -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
i44pc56.info.u 128M  2128  58  4282  12  3124  13  3265  86 29197  45 495.0
5
                    ------Sequential Create------ --------Random
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec
%CP
                 16    99  41   812  84   167  36    90  37   344  47   159
22
i44pc56.info.uni-karlsruhe.de,128M,2128,58,4282,12,3124,13,3265,86,29197,45,
495.0,5,16,99,41,812,84,167,36,90,37,344,47,159,22

>>>>>>>> Conclusion: No effect.