1JensK  28.02.2012 14:44:07  Domino on Linux Performance Tweaks with current Kernels

Hi Daniel.

Interesting. Do you have indications wether this issue relates to certain kernel versions or to all kernel versions of SLES 11?

We are not experiencing major performance issues at present althought some times the CPU util rises to 100%.

How do we detect if the cause of this rise in CPU is the scheduler?

We are currently running Domino 8.5.1 32 bit on SLES 11sp1 64bit intel architecture on VMware. Kernel version 2.6.32.49-0.3

Regards Jens

2Daniel Nashed  28.02.2012 15:14:40  Domino on Linux Performance Tweaks with current Kernels

@Jens, it's not a matter of high CPU usage. it's more a scheduling issue with the CFS scheduler. we have a delay in the server process when processing requests. this is more a timing issue than a high CPU issue.

you will see the delay when you look into the client_clock on your Notes Client or use my nshopen tool to measure the response time of "NoteOpen" transactions on cliend side.

All kernels with the CFS scheduler are affected.

Another note: You should update to a more recent Domino version! I would recommend that you move to 8.5.3 or maybe way when FP1 ships next month.

-- Daniel

3Wee Wah  14.03.2012 7:44:59  Domino on Linux Performance Tweaks with current Kernels

I would like to have your test program. We are already running R8.5.3. I'm noticing a lot of agent manager timeouts for no apparent reason. Thanks.

4Gregor  16.03.2012 9:48:44  Domino on Linux Performance Tweaks with current Kernels

Im working almost for three years to solve the issue why domino under linux guest (esxi) is much slower than windows guest (esxi). Something in the tcp configuration or data transfer handling is not working properly in domino. Other file transfers are working fast.

Do you have any sugesstions? I probably tried them almost all.

regards,

Gregor

5Pablo Jacobovici  24.06.2016 2:35:26  Domino on Linux Performance Tweaks with current Kernels

Hi Daniel, first of all congratulations for your blog, technically speaking it is really excellent.

I have encountered a similar issue in RHEL 6.4 64 bits with an application with a high user concurrency where every time users accessed the application run an agent on the WebQueryOpen event.

The performance of this application was really bad.

After analyzing the problem for several months with ibm, they request me to define FullTrimFix=0 in the notes.ini.

Although the documentation i found about this variable refers to arrays, they told me that also changes the way the semaphores are handled in memory when objects are created and destroyed very frequently.

This change lowered the number of context switches considerably.

They went from 200,000 to 10,000 approximately and greatly improved performance.

The improvement was approximately 50 to 1.

In tests I've done this works with version 8.5.3 and 9.0.1.

I have not tried other versions but surely work or at least it worth a try.

Again congratulations for your blog.

6Daniel Nashed  27.06.2016 9:27:57  Domino on Linux Performance Tweaks with current Kernels

@Pablo, Thanks for your comment! Interesting! I have sent you an email offline to discuss some details.