Hi,
What are the best configurations for 4 GB of ram and what for 8 Gb of ram?
Thanks
Ferdinando
Il 04/11/2016 20:00, 4d_tech-requ...@lists.4d.com ha scritto:
Message: 2
Date: Fri, 4 Nov 2016 10:37:41 -0400
From: Chip Scheide<4d_o...@pghrepository.org>
To: 4D iNug Technical<4d_tech@lists.4d.com>
Subject: RE: Progressive slow
Message-ID:<20161104103741651171.cf01d...@pghrepository.org>
Content-Type: text/plain; charset=us-ascii
Dennis -
I agree with you on the memory issue.
However, the initial question was/is:
Why are searches quick(er?) after a restart and slow down after some
period of server up time.
This is not/should not be a client side issue - it is most likely a
cache issue...
However there is one other thing that no one has pointed out -
it could be that OP's 4D code has a memory leak - i.e. the code is
using memory for some action(s) and NOT releasing that memory back to
4D/system. This could also causes a restricted memory issue which
could force 4D to start using the disk (virtual memory/paging) during a
query.
To fix this problem (memory leak) will require some code analysis, and
likely some time.
To insure that memory is returned (and yes I know 4D does a much better
job at this now).
clear the following items at the end of a process, if not when the code
is finished using it.
(local arrays are supposed to be cleared automagically).
- arrays (set to size zero or clear variable)
- sets (clear set)
- named selections (clear named selection)
- Lists (hierarchal especially) and Transient lists (created by Array
to list) - Clear List, be sure to clear all levels of an hierarchal
list)
- selections
- turn off On Err call, On event call
On Tue, 1 Nov 2016 21:06:29 +0000, Dennis, Neil wrote:
>With a 4GB machine you shouldn't use more than 2GB cache memory for
>4D server.
>
>You can consider a bigger/faster computer to help processing speed...
>often this is the easiest to increase performance.
>
>If you watch the server processes when there is a slowdown or when it
>starts to get slower, is the CPU, network, or disk higher than normal?
>
>A lot of 4D server performance can be controlled in the way that 4D
>code is written. Try to figure out what the client is doing with the
>server is slow. The watch pane can tell you a lot about the code that
>is executing when you are seeing slowness.
>
>There are a lot of things that can cause slow performance... Once you
>figure out what code is causing the slowness see if you can optimize
>it for server.
>
>Neil
>
>
>
>
>
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