Permanent high CPU load and timeouts in communication channels

[Former Member]

Dear Colleagues,

we've a strange issue since last week. At first we had an problem with a redirect to the cytrix online booking engine within the travel management application of our SAP NW Portal. There is a redirect.jsp file deployed in our PI system that connects to cytrix and passes the URL with session link and session cookie to our Portal. We fixed that issue by restarting the PI system.

We have a PI 7.0 stack 23 on HP-UX.

After restarting we found that we've got a very high CPU load (about 75% overall CPU, or 300% at 4 CPUs) probably caused by very frequent (3 per second) minor garbage collection runs (as seen in GC.log).

On friday we had timeouts within one of our communication channels in the PI system.

We changed the heap size from 2GB to 3GB and the new generation from 341MB to 768MB and restarted the PI system. But after a few ours the system uses 75% RAM of the CPU high CPU load and the GC runs are still the same.

This is a short excerpt of our GC.log:

52645.608: [GC 52645.608: [DefNew: 395326K->2003K(589824K), 0.0334788 secs] 1628688K->1235472K(2949120K), 0.0335882 secs]

52646.071: [GC 52646.072: [DefNew: 395219K->2072K(589824K), 0.0351584 secs] 1628688K->1235680K(2949120K), 0.0353002 secs]

52646.665: [GC 52646.665: [DefNew: 395288K->2173K(589824K), 0.0371023 secs] 1628896K->1236058K(2949120K), 0.0372198 secs]

52647.022: [GC 52647.022: [DefNew: 395389K->1969K(589824K), 0.0352723 secs] 1629274K->1235991K(2949120K), 0.0353865 secs]

52647.368: [GC 52647.368: [DefNew: 395185K->1885K(589824K), 0.0346132 secs] 1629207K->1235944K(2949120K), 0.0347310 secs]

52647.804: [GC 52647.804: [DefNew: 395101K->2069K(589824K), 0.0357804 secs] 1629160K->1236129K(2949120K), 0.0358980 secs]

52648.327: [GC 52648.328: [DefNew: 395285K->2285K(589824K), 0.0380093 secs] 1629345K->1236369K(2949120K), 0.0381374 secs]

52648.737: [GC 52648.738: [DefNew: 395501K->2282K(589824K), 0.0365516 secs] 1629585K->1236400K(2949120K), 0.0366749 secs]

52649.125: [GC 52649.125: [DefNew: 395498K->2435K(589824K), 0.0352310 secs] 1629616K->1236589K(2949120K), 0.0353407 secs]

52649.462: [GC 52649.462: [DefNew: 395651K->2436K(589824K), 0.0361161 secs] 1629805K->1236654K(2949120K), 0.0362322 secs]

52649.840: [GC 52649.840: [DefNew: 395652K->2322K(589824K), 0.0341640 secs] 1629870K->1236539K(2949120K), 0.0342721 secs]

Does anyone know what can cause the high load?

Is the frequency of the GC runs normal?

Can the timeouts be connected to the high CPU load?

The error ony occurs on our productive system.

I'd appriciate your help very much.

Kind regards,

Paul

[Eoin_Kierans]

It may be worthwhile checking the note #862405 'XI Configuration Options for Lowering Memory Requirements'

[MichalKrawczyk]

hi Paul,

I believe an issue like that needs to be done onsite and not via a forum

as it probably requires doing lots of checks/tests

my suggestion would be to get a PI consultant expert with basis experience onsite or do it via OSS with SAP

Regards,

Michal Krawczyk