Re: [Moosefs-users] Performance issue with symlinks

[Michal B. <mic...@ge...>]

Hi!

We should publish a new release of MooseFS capable of caching symlinks soon.


Kind regards
Michal Borychowski 
MooseFS Support Manager
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Gemius S.A.
ul. Wołoska 7, 02-672 Warszawa
Budynek MARS, klatka D
Tel.: +4822 874-41-00
Fax : +4822 874-41-01

-----Original Message-----
From: Flow Jiang [mailto:fl...@gm...] 
Sent: Wednesday, January 26, 2011 3:49 PM
To: moo...@li...
Subject: [Moosefs-users] Performance issue with symlinks

Hi,

I setup 2 Dell PowerEdge 1950 servers with moosefs-1.6.17 recently. 
Everything looks better than our original NFS mounted FS but when 
compiling source codes with gcc, the performance is bad. It takes 2~3 
times longer than NFS to generate dependency files. I did many tests to 
find out the reason, including changing the cache parameters for 
mfsmount, but 1Gbps mounted MFS is still not as good as 100Mbps mounted NFS.

Today I happened to see the report generated by mfscgiserv and one 
interesting finding is the "readlink" count to the source code folder is 
huge. And our source code is linked with symlinks for compiling so I 
think it's caused by the activity of reading source files.

I googled a while and found there's an old thread talked about caching 
for symlinks with fuse: 
http://sourceforge.net/mailarchive/forum.php?thread_name=E1K8yNn-00017E-PD%4
0pomaz-ex.szeredi.hu&forum_name=fuse-devel. 
So would that be the root cause of my problem? Or any other suggestions?

Many Thanks
Flow

----------------------------------------------------------------------------
--
Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)!
Finally, a world-class log management solution at an even better price-free!
Download using promo code Free_Logger_4_Dev2Dev. Offer expires 
February 28th, so secure your free ArcSight Logger TODAY! 
http://p.sf.net/sfu/arcsight-sfd2d
_______________________________________________
moosefs-users mailing list
moo...@li...
https://lists.sourceforge.net/lists/listinfo/moosefs-users