[Gluster-devel] writebehind slowness

[Harris Landgarten]

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" <avati at zresearch.com>
To: "Harris Landgarten" <harrisl at lhjonline.com>
Cc: "gluster-devel" <gluster-devel at nongnu.org>
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 < harrisl at lhjonline.com >: 

Avati, 

What mount command are you referring to? 

Harris 

----- Original Message ----- 
From: "Anand Avati" < avati at zresearch.com > 
To: "Harris Landgarten" < harrisl at lhjonline.com > 
Cc: "gluster-devel" < gluster-devel at nongnu.org > 
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 < avati at zresearch.com >: 

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 < harrisl at lhjonline.com >: 

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

Harris 

----- Original Message ----- 
From: "Anand Avati" < avati at zresearch.com > 
To: "Harris Landgarten" < harrisl at lhjonline.com > 
Cc: "gluster-devel" < gluster-devel at nongnu.org > 
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 < harrisl at lhjonline.com >: 

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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Anand V. Avati 



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Anand V. Avati 


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Anand V. Avati 



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Anand V. Avati