[Lustre-discuss] collectl

[Andreas Dilger]

On Jul 29, 2008  18:43 -0400, Mark Seger wrote:
> 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?

That one is only used once at mount... 

> -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.
>>   

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.