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
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