performance tuning

[prabal]

Tell me about, How kernal parameter will be tuned. and how do you tune the performance on HPUX ?

[CHRIS_ANORUO]

Hi Prubal,

Check this kernel parameter docs link: http://docs.hp.com/hpux/onlinedocs/os/KCparams.OverviewAll.html

[CHRIS_ANORUO]

Hi Parbal,

HPUX performance are mostly centred around CPU usage, Memory and Disks. This documents will also throw more light in this areas:
Doc id S3100002312A, B and C.
DEscriptin: Sys Adm: determining the cause of system performance problem.

The attached is mustly for Shared memory management

[Sandor Horvath_2]

Hi !

First You need found your bottleneck( I/O, CPU, Network), use sar command, after You config your kernel.

The performance depend of the application, so good if You know the application requirements( Shared memory, message queue, I/O buffers, etc).

regards, Saa.

[James R. Ferguson]

Hi:

A good general guide to isolating performance problems is document #KBRC00000947.

Another document with some tips for using individual kernel parameters is #KNC061098001.

These should give you a good start when taken together with the kernel parameter overview document noted by Chris.

The 'glance' performance monitor is a great realtime tool to use for performance monitoring. It is available on a trial basis from the Application CDROM(s) and is worth its permanent license fee.

...JRF...

[Steven Sim Kok Leong]

Hi,

We must never forget the network parameters which are equally as important as system parameters in the kernel. Network parameters cannot be tuned in SAM and have to be dynamically tuned at the command line and statically hardcoded in system startup scripts.

Network parameters such as TCP_CONN_REQUEST_MAX, TCP_KEEPALIVE_INTERVAL, FIN_WAIT_2_TIMEOUT, RETRANS interval, TCP trans and recv window sizes have very significant impact especially in the database and webserver environments. They can be finetuned using nettune in HP-UX 10.X and ndd in HP-UX 11.X.

Usually there will be a set of recommended values for both system and network parameters within your application's installation and configuration guide especially for database applications like Oracle. However, it is recommended to tweak these values progressively one at a time over time until near-optimal settings.

Hope this helps. Regards.

Steven Sim
Brainbench MVP for Unix Admin
http://www.brainbench.com