On Tuesday 03 May 2011 09:52 PM, Mohit Anchlia wrote:
Yes I can reproduce everytime I run my tests.
This happens always. Not sure if you call 50 threads writing files to
4 X 2 servers high load.
What version of GlusterFS are you using?
What application is seeing the slow open? How are you measuring the open
latency?
Application see slower response time and low throughput. For eg: you
would expect at least 80MB/s on 1GigE with 4 X 2 when each cluster
with "dd" can do 130 MB/s. But because of this I see only 20-30MB/s.
I am not very sure I would dive right away to that conclusion. Lets
first measure what is taking long to complete.
Pavan
On Mon, May 2, 2011 at 9:36 PM, Pavan<[email protected]> wrote:
On Sunday 01 May 2011 03:59 AM, Mohit Anchlia wrote:
Can someone from dev help with this? Is it overhead in fuse or
something else? I am seeing file open operation taking anywhere
between 30ms - 2 secs and this is killing the performance.
* Can you recreate this problem on your setup at will?
* Does the delay happen when you are opening any file or is it under certain
scenarios - like excessive load? What is application that is facing this
hang?
To start with, check if the open on the backend (on a single brick) is
taking long, with the same application.
Pavan
On Fri, Apr 29, 2011 at 4:27 PM, Mohit Anchlia<[email protected]>
wrote:
I am not seeing optimal performance out of my 4 X 2 cluster node. When
I look at thread state that's writing files I see most of them are
waiting on file open.
Does anyone know how to further troubleshoot this issue?
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