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Re: [Gluster-devel] writebehind slowness


From: Harris Landgarten
Subject: Re: [Gluster-devel] writebehind slowness
Date: Wed, 1 Aug 2007 15:22:23 -0400 (EDT)

Avati,

402 reduced the cp -av time with writebehind to 18s. The time with writebehind 
off is 12s. --direct-io=write-only had very little effect (.1-.2 sec)

Harris

----- Original Message -----
From: "Anand Avati" <address@hidden>
To: "Harris Landgarten" <address@hidden>
Cc: "gluster-devel" <address@hidden>
Sent: Wednesday, August 1, 2007 3:07:17 PM (GMT-0500) America/New_York
Subject: Re: [Gluster-devel] writebehind slowness

Harris, 

glusterfs --direct-io-mode=write-only -f /path/spec /mnt/glusterfs 

avati 


2007/8/2 , Harris Landgarten < address@hidden >: 

Avati, 

What mount command are you referring to? 

Harris 

----- Original Message ----- 
From: "Anand Avati" < address@hidden > 
To: "Harris Landgarten" < address@hidden > 
Cc: "gluster-devel" < address@hidden > 
Sent: Wednesday, August 1, 2007 1:03:58 PM (GMT-0500) America/New_York 
Subject: Re: [Gluster-devel] writebehind slowness 

Harris, 
also please try with "--direct-io-mode=write-only" command line argument to the 
mount command. 

thanks, 
avati 


2007/8/1 , Anand Avati < address@hidden >: 

Harris, 
the latest TLA has some cleanups about removing redundant synchronization 
locks, which can possible affect small files. can you please confirm if the 
performance hit on small files is seen with patch-402 as well? 

thanks! 

avati 


2007/8/1 , Harris Landgarten < address@hidden >: 

time cp -av /usr/share/zoneinfo /mnt/glusterfs/test 

Harris 

----- Original Message ----- 
From: "Anand Avati" < address@hidden > 
To: "Harris Landgarten" < address@hidden > 
Cc: "gluster-devel" < address@hidden > 
Sent: Wednesday, August 1, 2007 11:03:58 AM (GMT-0500) America/New_York 
Subject: Re: [Gluster-devel] writebehind slowness 

Harris, 
with what application did you benchmark these number? 

avati 


2007/8/1 , Harris Landgarten < address@hidden >: 

I am doing some very basic tests on 397. 

time cp -av /usr/share/zoneinfo /mnt/glusterfs/test 

with writebehind: 20s 

without writebehind: 12s 

Please check writebehind functionality. What test shows an improvement? 


Harris 


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