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Classics Forum

RE: ESQL/C Programs take very long time to sta....

Posted By: Alexandre Marini
Date: Tuesday, 27 March 2018, at 1:11 p.m.

In Response To: Re: ESQL/C Programs take very long time to start u (david@smooth1.co.uk)

That is a hard topic, maybe because there were two upgrades at the same time, so there my be multiple things.

I would also check within Suse docs looking for any kernel feature modification, eg disk IO scheduler
Just pessed a similar strange situation some time ago, but Informix was the same, so it was much easier to find out.

If there was no onconfig changes, if all machine notes guidelines were followed, I would first look for any OS internals changes, but it will be nice to open a case for IBM and ask for help.

HTH

Alexandre Marini
IBM Informix Certified Professional v10 / v11.50 / v11.70 / v12.10
IBM Informix on Cloud - Database Administrator - 2017
IBM dashDB Managed Service for Analytics and Transactions - 2017
DB2 Advanced DBA - v10.5 for LUW
IBM Information Management Informix Technical Professional
IBM Certified Developer - Informix Genero
Informix independent consultant

________________________________
De: classics-bounces@iiug.org <classics-bounces@iiug.org> em nome de david@smooth1.co.uk <david@smooth1.co.uk>
Enviado: terça-feira, 27 de março de 2018 13:45
Para: classics@iiug.org
Assunto: Re: ESQL/C Programs take very long time to sta.... [4733]

Is the issue the very first line of the code or after a database connection is
made?

Is a script used to launch the ESQL/C program when running from SYSTEM /CGI ?

Is the manual test done from the same environment/machine as when running from
SYSTEM /CGI?

Can you change the run command from SYSTEM/CGI to instead spawn a script which
then runs the progam as follows:

- First make a folder /tmp/x

- Run the program as

strace -s 2048 -v -o /tmp/x/$$ -ff -tt PROGRAM

then go throught the files in /tmp/x.

I would expect DNS lookup delays to be the most likely issue but the system
call trace will show the problem - look to big gaps in timestamps.

Regards,
David.

> On 27 March 2018 at 17:35 RICHARD SPITZ <richard.spitz@med.uni-muenchen.de>
wrote:
>
>
> Dear Informix Experts,
>
> I'm battling a performance issue since we switched our servers to SLES 12
SP2
> with IDS 12.10.FC8W1WE and CSDK 4.10.FC8W1.
>
> >From a normal shell, my ESQL/C programs (all of them in production for many
> years) start up very fast, there is no noticeable delay.
>
> However, there are two circumstances where ESQL/C programs take a very long
> time to start up:
> - when run via the SYSTEM command from within a SPL Routine
> - when run via CGI on an Apache webserver
>
> Strange thing is, the delay is not always the same. On some occasions, they
> run instantly, on average they take about 10 seconds, sometimes up to 30
> seconds or longer. Once started, the program itself performs normally,
> verified by inserting debugging code that writes timestamps at key points in
> the program to a log file.
>
> On the previous server (also a VMware ESX virtual machine) with SLES 11 and
> IDS 12.10.FC3WE / CSDK 4.10.FC3, this was never an issue.
>
> All programs used in SPL or CGI environments are statically compiled (esql
> -static), so I don't think it's an LD_LIBRARY_PATH issue. Only ESQL/C
programs
> are affected, normal C programs run as fast as ever.
>
> Has anybody run into such an issue before? Any ideas what to look into?
>
> Regards, Richard
>
>
>
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>

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