[OpenAFS] AFS Performance Question

Sven Oehme oehmes@de.ibm.com
Fri, 11 Apr 2003 07:46:04 +0200


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hy , 

there are a lot of posts in this area (performance) but i think nobody has 
a real clue for it ..
i think afs does not meet the requirement for single stream performance , 
because it was not designed for it  , but it preforms well , if you have a 
lot of clients that are accessing the same data .

i have done a lot on Performance tuning (HW , OS and SW) and now i receive 
datarates up to 20 MByte/s it's not what i need ( >50 MB) but better than 
the Rates on the beginning (~5 MB)

Sven





Eike Suthau <eike.suthau@mailbox.tu-dresden.de>
Sent by: openafs-info-admin@openafs.org
04/11/2003 02:12 AM
 
        To:     openafs-info@openafs.org
        cc: 
        Subject:        [OpenAFS] AFS Performance Question


Hello, 

I have installed AFS client and server on my Debian Woody Box which is a 
Duron 
1100 with 256MB of RAM.  I am  currently using a loop back device for 
/vicepa 
formated with standard ext3 (about 500MB).  200MB located on ext3 are used 

for the cache directory. UDMA66 is on and the System has never given me 
any 
trouble on the hardware side.

In order to get a rough estimate of the data rates to be expected I have 
run 
cp with files (all zeros) of 10MB and 100MB. I find the results very 
confusing:

time cp /tmp/test10 /afs/home/eike
                 real    0m3.573s
                 user    0m0.020s
                 sys     0m0.170s

time cp /tmp/test100 /afs/home/eike
                 real    1m24.240s
                 user    0m0.030s
                 sys     0m7.950s

time cp /afs/home/eike/test100 /tmp/test100b
                 real    1m8.672s
                 user    0m0.090s
                 sys     0m1.980s

I cannot believe that the results are normal since the machine is allmost 
completely idle during copying and stil only manages 2.8MB/s.

I would  greatly appreciate any hint to what I have done wrong and it 
would 
also be very interesting to know what speed to expect from my type of 
hardware.

Regards, 
eike


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<br><font size=2 face="sans-serif">hy , </font>
<br>
<br><font size=2 face="sans-serif">there are a lot of posts in this area
(performance) but i think nobody has a real clue for it ..</font>
<br><font size=2 face="sans-serif">i think afs does not meet the requirement
for single stream performance , because it was not designed for it &nbsp;,
but it preforms well , if you have a lot of clients that are accessing
the same data .</font>
<br>
<br><font size=2 face="sans-serif">i have done a lot on Performance tuning
(HW , OS and SW) and now i receive datarates up to 20 MByte/s it's not
what i need ( &gt;50 MB) but better than the Rates on the beginning (~5
MB)</font>
<br>
<br><font size=2 face="sans-serif">Sven</font>
<br>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td>
<td><font size=1 face="sans-serif"><b>Eike Suthau &lt;eike.suthau@mailbox.tu-dresden.de&gt;</b></font>
<br><font size=1 face="sans-serif">Sent by: openafs-info-admin@openafs.org</font>
<p><font size=1 face="sans-serif">04/11/2003 02:12 AM</font>
<td><font size=1 face="Arial">&nbsp; &nbsp; &nbsp; &nbsp; </font>
<br><font size=1 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; To:
&nbsp; &nbsp; &nbsp; &nbsp;openafs-info@openafs.org</font>
<br><font size=1 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; cc:
&nbsp; &nbsp; &nbsp; &nbsp;</font>
<br><font size=1 face="sans-serif">&nbsp; &nbsp; &nbsp; &nbsp; Subject:
&nbsp; &nbsp; &nbsp; &nbsp;[OpenAFS] AFS Performance Question</font></table>
<br>
<br>
<br><font size=2><tt>Hello, <br>
<br>
I have installed AFS client and server on my Debian Woody Box which is
a Duron <br>
1100 with 256MB of RAM. &nbsp;I am &nbsp;currently using a loop back device
for /vicepa <br>
formated with standard ext3 (about 500MB). &nbsp;200MB located on ext3
are used <br>
for the cache directory. UDMA66 is on and the System has never given me
any <br>
trouble on the hardware side.<br>
<br>
In order to get a rough estimate of the data rates to be expected I have
run <br>
cp with files (all zeros) of 10MB and 100MB. I find the results very <br>
confusing:<br>
<br>
time cp /tmp/test10 /afs/home/eike<br>
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
real &nbsp; &nbsp;0m3.573s<br>
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
user &nbsp; &nbsp;0m0.020s<br>
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
sys &nbsp; &nbsp; 0m0.170s<br>
<br>
time cp /tmp/test100 /afs/home/eike<br>
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
real &nbsp; &nbsp;1m24.240s<br>
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
user &nbsp; &nbsp;0m0.030s<br>
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
sys &nbsp; &nbsp; 0m7.950s<br>
<br>
time cp /afs/home/eike/test100 /tmp/test100b<br>
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
real &nbsp; &nbsp;1m8.672s<br>
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
user &nbsp; &nbsp;0m0.090s<br>
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
sys &nbsp; &nbsp; 0m1.980s<br>
<br>
I cannot believe that the results are normal since the machine is allmost
<br>
completely idle during copying and stil only manages 2.8MB/s.<br>
<br>
I would &nbsp;greatly appreciate any hint to what I have done wrong and
it would <br>
also be very interesting to know what speed to expect from my type of <br>
hardware.<br>
<br>
Regards, <br>
eike<br>
<br>
<br>
_______________________________________________<br>
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OpenAFS-info@openafs.org<br>
https://lists.openafs.org/mailman/listinfo/openafs-info<br>
</tt></font>
<br>
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