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<div class="moz-cite-prefix">On 09/06/2016 12:27 PM, Keiviw wrote:<br>
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<blockquote
cite="mid:41265839.f881.156fe4991e1.Coremail.keiviw@163.com"
type="cite">
<div
style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial">Could
you please tell me your glusterfs version and the mount command
that you have used?? My GlusterFS version is 3.3.0, different
versions may be exits different results.<br>
</div>
</blockquote>
<br>
<tt>I tried it on the master branch, on Fedora 22 virtual machines
(kernel version: 4.1.6-200.fc22.x86_64 ). By the way 3.3 is a
rather old version, you might want to use the latest 3.8.x release.</tt><br>
<br>
<blockquote
cite="mid:41265839.f881.156fe4991e1.Coremail.keiviw@163.com"
type="cite">
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style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><br>
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At 2016-09-06 12:35:19, "Ravishankar N"
<a class="moz-txt-link-rfc2396E" href="mailto:ravishankar@redhat.com"><ravishankar@redhat.com></a> wrote:<br>
<blockquote id="isReplyContent" style="PADDING-LEFT: 1ex;
MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div class="moz-cite-prefix">That is strange. I tried the
experiment on a volume with a million files. The client
node's memory usage did grow, as I observed from the output
of free(1) <a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="http://paste.fedoraproject.org/422551/">http://paste.fedoraproject.org/422551/</a>
when I did a `ls`.<br>
-Ravi<br>
<br>
On 09/02/2016 07:31 AM, Keiviw wrote:<br>
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<blockquote
cite="mid:41fc21e8.642a.156e8a129e6.Coremail.keiviw@163.com"
type="cite">
<div id="contentDescription"
style="line-height:1.5;text-align:justify;text-justify:inter-ideograph">
<div>Exactly, I mounted the volume in a no-brick
node(nodeB), and nodeA was the server. I have set
different timeout, but when I excute "ls
/mnt/glusterfs(about 3 million small files, in other
words, about 3 million dentries)", the result was the
same, memory usage in nodeB didn't change at all while
nodeA's memory usage was changed about 4GB!</div>
<div><br>
</div>
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<div
style="font-size:14px;line-height:1.5;word-break:break-all;margin-left:10px;margin-right:10px">On
09/02/2016 09:45, <a moz-do-not-send="true"
style="text-decoration:none;color:#2a97ff;"
href="mailto:ravishankar@redhat.com">Ravishankar N</a>
wrote:</div>
</div>
<blockquote id="ntes-iosmail-quote" style="margin:0">
<div class="moz-cite-prefix">On 09/02/2016 05:42 AM,
Keiviw wrote:<br>
</div>
<blockquote
cite="mid:6cbf1881.1050.156e83d1e68.Coremail.keiviw@163.com"
type="cite">
<div
style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial">Even
if I set the attribute-timeout and entry-timeout to
3600s(1h), in the nodeB, it didn't cache any
metadata because the memory usage didn't change. So
I was confused that why did the client not cache
dentries and inodes.<br>
<br>
</div>
</blockquote>
<tt>If you only want to test fuse's caching, I would try
mounting the volume on a separate machine (not on the
brick node itself), disable all gluster performance
xlators, do a find.|xargs stat on the mount 2 times in
succession and see what free(1) reports the 1st and
2nd time. You could do this experiment with various
attr/entry timeout values. Make sure your volume has a
lot of small files.<br>
-Ravi<br>
</tt>
<blockquote
cite="mid:6cbf1881.1050.156e83d1e68.Coremail.keiviw@163.com"
type="cite">
<div
style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><br>
<br>
在 2016-09-01 16:37:00，"Ravishankar N" <a
moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:ravishankar@redhat.com"><ravishankar@redhat.com></a>
写道：<br>
<blockquote id="isReplyContent" style="PADDING-LEFT:
1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc
1px solid">
<div class="moz-cite-prefix">On 09/01/2016 01:04
PM, Keiviw wrote:<br>
</div>
<blockquote
cite="mid:14087c4e.3f73.156e4ab683e.Coremail.keiviw@163.com"
type="cite">
<div
style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial">
<div>Hi,</div>
<div> I have found that GlusterFS
client(mounted by FUSE) didn't cache
metadata like dentries and inodes. I have
installed GlusterFS 3.6.0 in nodeA and
nodeB, and the brick1 and brick2 was in
nodeA, then in nodeB, I mounted the volume
to /mnt/glusterfs by FUSE. From my test, I
excuted 'ls /mnt/glusterfs' in nodeB, and
found that the memory didn't use at all.
Here are my questions:</div>
<div> 1. In fuse kernel, the author set
some attributes to control the time-out
about dentry and inode, in other words, the
fuse kernel supports metadata cache, but in
my test, dentries and inodes were not
cached. WHY?</div>
<div> 2. Were there some options in
GlusterFS mounted to local to enable the
metadata cache in fuse kernel? </div>
</div>
<br>
<br>
</blockquote>
<tt>You can tweak the attribute-timeout and
entry-timeout seconds while mounting the volume.
Default is 1 second for both. `man
mount.glusterfs` lists various mount options.<br>
-Ravi<br>
</tt>
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