Can Websphere cause high CPU utilization even if it doesn't consume that much memory?

[Andres Delrotti]

Hello,

Can Websphere cause high CPU utilization even if it doesn't consume that much memory? Since we deployed a new application in our Websphere, it periodically caused high cpu utilization at certain time intervals. The weird thing is when we forced a heap dump and look at the memory consumption, it really doesn't consume much. CPU Utilization reaches close to 100% so we would always need to restart it for everything to go back to normal.

thanks

[E Armitage]

Yes, CPU and memory are different resources which are not always impacted at the same time. You are lucky that it happens at periodic intervals so you know when to check and what processes are running in your application at that time.

[Mikalai Zaikin]

Andres Delrotti wrote:
Hello,

Can Websphere cause high CPU utilization even if it doesn't consume that much memory? Since we deployed a new application in our Websphere, it periodically caused high cpu utilization at certain time intervals. The weird thing is when we forced a heap dump and look at the memory consumption, it really doesn't consume much. CPU Utilization reaches close to 100% so we would always need to restart it for everything to go back to normal.

thanks

Hello,

Sure WAS can cause high CPU utilization.

Note, for CPU problems more important Java Core than Heap Dump. Java core contains list of all threads in JVM and their statuses, including "BLOCKED" and "CONDITIONALLY WAITING".

Also, if you wish to research problem of CPU, better refer MustGather document for this specific problem

HTH,
MZ