[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 ,
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 ( >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 <eike.suthau@mailbox.tu-dresden.de></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"> </font>
<br><font size=1 face="sans-serif"> To:
openafs-info@openafs.org</font>
<br><font size=1 face="sans-serif"> cc:
</font>
<br><font size=1 face="sans-serif"> Subject:
[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. I am currently using a loop back device
for /vicepa <br>
formated with standard ext3 (about 500MB). 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>
real 0m3.573s<br>
user 0m0.020s<br>
sys 0m0.170s<br>
<br>
time cp /tmp/test100 /afs/home/eike<br>
real 1m24.240s<br>
user 0m0.030s<br>
sys 0m7.950s<br>
<br>
time cp /afs/home/eike/test100 /tmp/test100b<br>
real 1m8.672s<br>
user 0m0.090s<br>
sys 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 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>
OpenAFS-info mailing list<br>
OpenAFS-info@openafs.org<br>
https://lists.openafs.org/mailman/listinfo/openafs-info<br>
</tt></font>
<br>
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