eprints_tech messages

From: "Matthew Brady" <bradym AT usq.edu.au>
Date: Mon, 13 Oct 2008 08:05:10 +1000

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I have had this happen.... It was quite frustrating to track it down.

I'm assuming you are using a pre 3.x.x version of eprints.??

For me it was the generate views script that I had cronned each night...


We had a few simple views being created each, we added a new people
view, which then subsorted by year, this took the processing time up to
almost 22hours (from 2hrs).

Eventually the number of eprints in our system grew, and the script was
taking 24+ hours, and cron fired off a 2nd copy, before the first had
finished.

We ended up getting load averages of 300+ !!! While both were running
concurrently.

To fix this I fiddled the settings for mysql.  Increasing memory etc.

The 128000000 values I used as 1/8 of system memory.. I have since
increased it even more, but I recommend keeping it below 50% of system
memory.

Inside MySQL as root/owner of the MySQL system Run 

SET GLOBAL query_cache_size = 128000000; SET GLOBAL key_buffer_size =
128000000; SET GLOBAL table_cache = 128;


Hope this helps a bit.

Matt

-----Original Message-----
From: owner-eprints-tech AT ecs.soton.ac.uk
[mailto:owner-eprints-tech AT ecs.soton.ac.uk] On Behalf Of Alex Birchall
Sent: Friday, 10 October 2008 7:26 PM
To: eprints-tech AT ecs.soton.ac.uk
Subject: [EP-tech] Mysteriously halting Ubuntu EPrints server?

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db14f7f93-45FD7C69E1B7C94F8980D6569D68657E5829E6%40MDX-CLX-DC1.uni.mdx.a
c.uk%3E
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Dear All,

We have EPrints installed on an Ubuntu 8.04 (the Hardy Heron) server.
On two occasions in the last couple of months this server has halted for
no apparent reason.  What has happened is this:

I have attempted to connect to the server using SSH Secure Shell.  This
connection appears to be successful but a command prompt never appears
-- this is the first indication that something is amiss.  I then try to
connect to the server using TightVNC, but this too fails.  I check to
see if EPrints is accessible and find that it is not.

The only option I am left with is to physically turn off the server,
then turn it back on.

Has anyone else encountered this with an Ubuntu server?

Regards,

Alex Birchall
Library Systems Manager
Middlesex University
The Sheppard Library
The Burroughs
London NW4 4BT
UK

Tel:  +44 (0) 20 8411 5235
Mobile:  07765 237 570




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