firebird-support - Re: [firebird-support] Very very very slow FB 2.5.2 64bit performance on Windows 2008 R2

Subject	Re: [firebird-support] Very very very slow FB 2.5.2 64bit performance on Windows 2008 R2
Author	Roland Turcan
Post date	2014-01-22T22:03:12Z

Re: [firebird-support] Very very very slow FB 2.5.2 64bit performance on Windows 2008 R2 AFAIK, the parameter DefaultDbCachePages is intended for newly created
databases as default size of cache pages. It doesn't have effect on existing
databases where its own setting is used. Every database can have own setting
about count of cache pages.

It seems to be still not solving this problem using by FileSystemCacheSize.

What else can I test?

Thanks.

<<< 22.01.2014 15:05 - Hugo Eyng "hugoeyng@..." >>>

Try changing values for DefaultDbCachePages

Em 21/01/2014 18:40, Roland Turcan escreveu:

I have tried to change this parameter (actually =20), but I don't see any change.

My server box is:

Hewlett Packard server
Intel Xeon CPU E31220 @ 3.10GHx
10GB RAM (8 GB RAM is usable)

Firebird 2.5.2 64bit SuperServer
single database is being used
where its size is about 80GB

When I copy any big file to test the performance of disk field then I can see
that it can force disk performance, but Firebird is still relaxing.

When I try to backup database using "gbak" no change. CPU core is on 3-6% and disk
load is about 1MB/s

What can I check else?

Thanks in advance.

TRoland;

<<< 21.01.2014 15:17 - Hugo Eyng "hugoeyng@..." >>>

I changed the paramter FileSystemCacheSize = 0 to FileSystemCacheSize = 20 in the firebird.conf
as suggested in:

http://dyemanov.blogspot.com.br/2012/03/firebird-vs-windows-file-system-caching.html

Hugo

Em 21/01/2014 12:06, Roland Turcan escreveu:

Yes, I am interested too.

What was the key to get rid of this problem?

Thanks in advance.

<<< 21.01.2014 15:29 - Fabiano - Desenvolvimento SCI "fabiano@..." >>>

How you solved your problem?

De: firebird-support@yahoogroups.com [mailto:firebird-support@yahoogroups.com] Em nome de Hugo Eyng
Enviada em: terça-feira, 21 de janeiro de 2014 10:24
Para: firebird-support@yahoogroups.com
Assunto: Re: [firebird-support] Very very very slow FB 2.5.2 64bit performance on Windows 2008 R2

Hi Helen.

Thanks for your answer.

You are right.

But the "Windows 64 file cache performance" was a problem, as said Sean.

Só 'reserving' 10GB as a RAM DRIVE grant that I would have always available RAM.

But now I solved the 'cache performance' and I will not need RAM DRIVE anymore.

Even so, the FB performance is not compatible to the hardware used to run it.
Em 20/01/2014 23:12, Helen Borrie escreveu:

At 02:01 p.m. 21/01/2014, Hugo Eyng wrote:

>As Firebird do not use available RAM I created a RAM DRIVE with 10GB and pointed parameter 'TempDirectories' (firebird.conf) to this RAM DRIVE, but FB just uses it rarely in very big 'SELECT'. OK, when FB uses the RAM DRIVE it increases a SELECT speed in more than 80%. I expected FB could use this for every SELECTS and so improve the application.

Fb uses RAM directly for sorts, if enough is available. It only takes the sort sets to disk if available RAM is insufficient.

Helen Borrie, Support Consultant, IBPhoenix (Pacific)
Author of "The Firebird Book" and "The Firebird Book Second Edition"
http://www.firebird-books.net
__________________________________________________________

--

Atenciosamente,

Hugo Eyng

>As Firebird do not use available RAM I created a RAM DRIVE with 10GB and pointed parameter 'TempDirectories' (firebird.conf) to this RAM DRIVE, but FB just uses it rarely in very big 'SELECT'. OK, when FB uses the RAM DRIVE it increases a SELECT speed in more than 80%. I expected FB could use this for every SELECTS and so improve the application.

--
Best regards, TRoland
http://www.rotursoft.sk
http://exekutor.rotursoft.sk

--

Atenciosamente,

Hugo Eyng

--
Best regards, TRoland
http://www.rotursoft.sk
http://exekutor.rotursoft.sk