topic Re: Problem on dld in Operating System - HP-UX

Problem on dld

Soumen Ghosh_1 — Thu, 12 Sep 2002 08:41:12 GMT

Hello,
On HP-UX 11.0, we are facing some problems. Intermittently, it is givin problems like the following :
crt0: ERROR couldn't open /usr/lib/dld.sl errno:000000023

But this problem is not continuous. Some times, it comes up and sometimes, there is no problem.
When there is problem, normal commands don't work and gives the same problem.

Any idea.

Thanks in advance.

Soumen Ghosh

Re: Problem on dld

Steve Steel — Thu, 12 Sep 2002 08:51:13 GMT

Hi

Seen it before . Kernel tuning

Suggest change the following kernel
parameters and generate a new kernel:

npty: Double it

maxusers: + 50%

Steve steel

Re: Problem on dld

Soumen Ghosh_1 — Thu, 12 Sep 2002 09:55:09 GMT

Hello Steve,

Thanks for the answer.
The system's syslog tells that the problem is because of "File table overflow".
I believe value of "nfile" system parameter is to be increased.
Now, how do I need to consider the system resource constraint?
My system is a K-class system with HP-UX 11.0 running on 512 MB ram. It has got one processor. Can I increase "nfile" parameter value arbitrarily? Or would it affect the system performance? What is the optimal value of "nfile" I have to reach?

The most resource consuming processes are Tomcat, Oracle. Because tomcat is a multi-threaded server, it is taking away 3 file descriptors for each thread, I believe.

How do I reach the optimum value of "nfile" system parameter without affecting system performance?

Thanks in advance.

Soumen Ghosh

Re: Problem on dld

Dirk Wiedemann — Thu, 12 Sep 2002 10:30:49 GMT

Hello Soumen,

have a look at this thread: http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x399d93e260b0d611abdb0090277a778c,00.html

It's the same problem. As explained there nfile is calculated from maxuser, increase maxuser.

regards
Dirk

Re: Problem on dld

Anil C. Sedha — Thu, 12 Sep 2002 15:42:55 GMT

Soumen,

Try this

16*(nproc+16+maxusers)/10+32+2*(npty+nstrpty+nstrtel)

Regards,
Anil

Re: Problem on dld

Sanjay_6 — Thu, 12 Sep 2002 16:08:08 GMT

Hi Soumen,

Looks like a permission issue.

Try this link,

http://support2.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000062976095

Hope this helps.

Regds

Re: Problem on dld

James R. Ferguson — Thu, 12 Sep 2002 16:16:27 GMT

Hi:

If you look up the error number in '/usr/include/sys/errno.h' you will note that number-23 is a file table overflow.

This relates to the 'nfile' kernel parameter:

http://docs.hp.com/hpux/onlinedocs/939/KCParms/KCparams.OverviewAll.html

You will thus need to increase it and regenerate your kernel.

Regards!

...JRF...

Re: Problem on dld

Soumen Ghosh_1 — Fri, 13 Sep 2002 03:07:25 GMT

Hello,

Thanks everybody for the answer.
Undoubtedly, it is happenng because of too low a value of 'nfile' system parameter.

I want to know specifically whether I can increase the value without worrying about the system performance.
Our system is a K-class with 512 MB ram running on single processor.

Would increase in 'nfile' system parameter decrease system performance?

Thanks.

Soumen Ghosh

Re: Problem on dld

James R. Ferguson — Fri, 13 Sep 2002 09:13:48 GMT

Hi:

You asked if "Would increase in 'nfile' system parameter decrease system performance?"

First, you're *not* getting optimal performance because of the 'nfile' ceiling -- it's too low to allow all your processes to run.

You need to increase 'nfile' to *improve* performance. 'nfile' specifies the number of elements in the file descriptor table. By doing so, it defines the number of files that can be open simultaneously, system-wide.
Its consumption of memory is very minimal, so allocate 'nfile' generously.

Regards!

...JRF...