High Performance Kernel Linux

[Former Member]

Dear all,

Can you tell me what is that? It is version 7.11 latest patch 89.

What's difference with 'your everyday' kernel?

Thanks for your help.

Best Regards,

[markus_doehr2 · Accepted solution]

Did you try a notes search?

http://service.sap.com/notes

--> enter "high performance linux kernel" as search term.

Markus

[Former Member · Accepted solution]

Yes I have.

There's no explanation what is 'high performance' is about, and pros and cons of using that.

I've checked that Windows also have high performance kernel, and in the note it is said not to use it unless told by sap support.

Best Regards,

[markus_doehr2 · Accepted solution]

> There's no explanation what is 'high performance' is about, and pros and cons of using that.

The explanation is in the note: it's a kernel that is built with compiler profiling optimization; this means, that a special build option is used to build the kernel. During the runtime of the SAP application information is stored in a file which is later then used to build the kernel again so the compiler knows which functions are called more often and how to place them in the binary.

As stated in the note you can use those kernels normally but since they are not built for each kernel version you may need to switch back to the normal kernels if you need a certain patch for which ther's no HP-kernel available.

There are no drawbacks in functionality or usage.

Markus

[Former Member · Accepted solution]

Thanks for your information.

Drawbacks I found are it generated abap dump when trying to copy user with 'user parameter' option enable, and when deleting user in object CL_HR_OBJECTMANAGER.

When switch to normal kernel, it's running normal again.

I'd recommend not to use this kernel at present.

[markus_doehr2 · Accepted solution]

> Drawbacks I found are it generated abap dump when trying to copy user with 'user parameter' option enable, and when deleting user in object CL_HR_OBJECTMANAGER.

What kind of dump is occurring? Are you sure this is related to the high performance compilation? If yes, I'd open an OSS call.

Markus

[Former Member · Accepted solution]

It is SYNTAX_ERROR in program "CL_HR_OBJECTMANAGER===========CP"

Error in the ABAP Application Program

The current ABAP program "SAPLOM_USER_SETTINGS" had to be terminated because it

has

come across a statement that unfortunately cannot be executed.

The following syntax error occurred in program

"CL_HR_OBJECTMANAGER===========CP " in include "OM_OBJMAN_DISPLAYTOOL_GRID "

in

line 160:

"Classes may be defined within a local definition include, but not impl"

"emented. The implementations must be executed in the local implementat"

"ion include. include be made in the local implementation include"

" "

When using SAP Kernel 7.01, and doing a syntax check, it only gives warning.

But when using 7.11, syntax check gives an error, therefore generating ABAP DUMP.

Notes 830204 can't solve the problem.

[markus_doehr2 · Accepted solution]

> When using SAP Kernel 7.01, and doing a syntax check, it only gives warning.

> But when using 7.11, syntax check gives an error, therefore generating ABAP DUMP.

So you're saying that you run a 7.11 kernel against an ERP system? This is not supported and this could be the explanation why it's not working.

You must only use a kernel 7.01 against an ERP with EHP1, even if it's technically possible to start a system with a newer kernel.

Markus

[Former Member · Accepted solution]

Thanks Markus for the enlightments.