[Lustre-discuss] collectl

[Mark Seger]

your definition are perfect and I'll add them to my documentation.  With 
respect to my comment about chmod on 100 files only incrementing the 
counter once, it did it 100 times this time when I tired it, so never 
mind...

one counter you didn't mention is getstatus.  when does that get updated?

-mark

Andreas Dilger wrote:
> On Jul 29, 2008  14:36 -0400, Mark Seger wrote:
>   
>> One thing that confuses me about lustre counters, and maybe others, is I  
>> don't really know what they mean, when they change and in fact how to  
>> stimulate them to change.  For example, on my system I'm doing a watch  
>> of /proc/fs/lustre/mdt/MDS/mds/stats and only see 1 reint counter,  
>> because the others are all 0.  So I went and did some file renames, and  
>> chmods and sure enough, the other counters did appear.  Cool!
>>     
>
> Yes, this is expected.  We dropped the "0" counters because they are very
> noisy and useless in most contexts.
>
>   
>> The easiest thing for me to do is to simply say that reint_setattr  
>> counts the number of setattrs, but that would be a pretty weak  
>> definition. When I changed did a single chmod to 100 files, setattr only  
>> incremented by 1 and I expected it to increment by 100.
>>     
>
> It should have been incremented by 100, and if it didn't it is possibly
> a bug.
>
>   
>> want to be the one responsible for the words or all you're going to see  
>> is 'reint_setattr counts the number of setattr calls' and I really don't  
>> think that would be all that useful to anyone.
>>     
>
> "reint_setattr" includes all operations that modify inode attributes,
> including chmod, chown, touch, etc.
>
>   
>>>>>> mds_reint_create          11018837 samples [reqs] 1 1 11018837  
>>>>>>             
>
> For mknod and mkdir operations, also used by NFS servers internally
> when creating files.
>
>   
>>>>>> mds_reint_link            51315 samples [reqs] 1 1 51315 51315
>>>>>>             
>
> For hard or symbolic links, like with "ln"
>
>   
>>>>>> mds_reint_rename         224241 samples [reqs] 1 1 224241 224241
>>>>>>             
>
> For file and directory renames, like with "mv".
>
>   
>>>>>> mds_reint_unlink          13109877 samples [reqs] 1 1 13109877  
>>>>>>             
>
> For removing files and directories, like with "rm" or "rmdir".
>
>   
>>>>>> mds_getxattr              36089 samples [usec] 9 8996 675208 252525110
>>>>>>             
>
> For extended attributes and ACLs, like with "getfattr" or "getfacl".
>
>   
>>>>>> mds_setxattr              1230 samples [usec] 123 10110 263367  
>>>>>>             
>
> For extended attributes and ACLs, like with "setfattr" or "setfacl".
>
> Cheers, Andreas
> --
> Andreas Dilger
> Sr. Staff Engineer, Lustre Group
> Sun Microsystems of Canada, Inc.
>