Rerunning SGEN for CRM

[Former Member]

Hi all,

I would like to get idea regarding rerunning SGEN in our CRM system. We upgraded our pre-production system, and run SGEN after the upgrade. Run completed, however, runs for about 83 hours.

We will run the same upgrade in our production CRM next month. The 83 hours runtime translates to about 3.5 days the SGEN is running. Meaning 3.5 days users will encounter their transactions will load in the first instance they executes it. Non technical users will see it as system performance, and could cause so much noise in the business.

We are looking at rerunning SGEN on the system to see if this time, the runtime will be faster, so that we can get a much shorter benchmark.

If we do such, can anybody suggest how can we ensure that it will really repeat the regeneration of loads?

Also, can anyone suggest further optimization activity when running SGEN?

We would appreciate your response for inputs. Thanks.

Regards,

Philip

[Reagan]

83 hours for SGEN is not acceptable. It looks like the pre-production has shortage of resources.

If the production system has multiple application servers then you can have better execution for SGEN execution.

Regards

RB

[Former Member]

Thanks Reagan,

Yes, it is. Now we requested to add CPU in the system.

What we want to try though is if we can rerun SGEN again, so that we could get overview of how long would it possibly take or if the runtime would improve with the increase in resources.

If we can rerun SGEN, what option we can use?

Regards,

Philip

[Reagan]

Hello Philip

You can start SGEN and see if the time taken to regenerate the load is less than it took after the upgrade. I am not sure whether the duration will less due to the fact that SGEN was already executed after the upgrade.

If you have upgraded the resources on the system then schedule SGEN with "Regenerate after an SAP upgrade"

Regards

RB

[madasamy_arunachalam]

Hi

Best option to run SGEN is select few components (like BASIS, ABAP....)  instead of selecting entire components at single job...

Yes, it is more manual task but it will finish quicker but each job  can be scheduled/started as soon as previous one is finished.

regards

Swami

[divyanshu_srivastava3]

Hi Philip,

Please read below post on using parallel servers.

1132507 - SGEN: Using maximum number of free work processes

452538 - Defining the 'parallel_generators' RFC group

Regards,

Divyanshu