[Pvfs2-developers] Listing performance patch

[Rob Ross]

Has the internal kernel value changed since we last looked?

Rob

On Sep 4, 2008, at 4:16 PM, Phil Carns wrote:

> Sam Lang wrote:
>> Hi Bart,
>> Thanks for the patch.  For users with that many files in a  
>> directory, using pvfs2-ls is probably a good alternative.
>> The kernel does readdir requests 32 entries at a time, so  
>> increasing MAX_NUM_DIRENTS won't help for ls.  Long listings  
>> requires getting the size of files, which in PVFS is fairly  
>> expensive.
>> Unfortunately, we haven't kept up with the readdirplus  
>> implementation, some bugs have probably crept in since Murali added  
>> that tool.  If you were motivated to look at where the servers were  
>> crashing, we'd certainly be interested in helping with the  
>> debugging there.
>> Thanks again,
>> -sam
>
> It does look like ls improved with the patches for some reason,  
> though.
>
> The 256 and 512 results are also just about close enough to be  
> noise. It looks like most of the benefit came from the jump from  
> 32/64 to 256.
>
> -Phil
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