Loading
search-img
Title
100% CPU on IBM AIX

Summary

The article explains why you may get 100% CPU usage on IBM AIX

Symptoms

After running for 12 hours the vendor daemon starts consuming up to 100% of the CPU time.

Cause

The cause was found to be a universal problem affecting not just FNP - these are examples from internet forums
https://www.ibm.com/developerworks/forums/thread.jspa?messageID=13882913&#13882913
This forum posting describes and known problem called APAR IY89429 that was resolved with 5300-05-03
And this posting suggests the same thing
Abstract
There is a problem with AIX 5.2 (bos.net.tcp.client 5.2.0.75) and AIX 5.3 (bos.net.tcp.client 5.3.0.50) that causes problems with WebSphere Voice Response.

Content
When a TCP connection goes idle, the remote end (which need not be AIX) sends TCP 'keepalives'. AIX will respond to five 'keepalives' and stop responding after that. This causes the TCP connection to close unexpectedly.
The result of this problem is that Java RMI and SSI clusters will timeout after just over 12 hours of inactivity, resulting in the failure of WebSphere Voice Response.
Solution
AIX 5.3 is corrected by APAR IY89429 and is now available from FixCentral as bos.net.tcp.client 5.3.0.54.
AIX 5.2 is corrected by APAR IY89387 and is now available from FixCentral as bos.net.tcp.client 5.2.0.98.

Resolution

As described above upgrading AIX with these patches will resolve the issue
AIX 5.3 is corrected by APAR IY89429 and is now available from FixCentral as bos.net.tcp.client 5.3.0.54.
AIX 5.2 is corrected by APAR IY89387 and is now available from FixCentral as bos.net.tcp.client 5.2.0.98.
Was this helpful?
Support Hub
Create a case with Support
0/255
Upload Attachment
File Upload
Maximum file size allowed is 3 MB.
File type not supported.
Supported file types:
Documents (.txt, .doc, .docx, .pdf), Images (.jpg, .png), Comma Separated Files (.csv) Speadsheets (.xlsx, .xls)

Are you sure you want to cancel the case creation?

Are you sure you want to close this case

Get Hotline support
Products Region Phone Numbers
FlexNet Operations
FlexNet Embedded
FlexNet Publisher
FlexNet Connect
FlexNet Code Insight
InstallAnywhere
InstallShield 		North America  * +1 630-332-2513 (toll)
+1 877-279-2853 (toll-free in North America)
Europe  * +44 1925 944367 (toll)
+44 800 047 8642 (toll-free in Europe)
Japan  * +81 3-4540-5335 (select option 2)
Australia  * +61 3 9895 2177
+61 1800 560 603 (toll-free in Australia)
Usage Intelligence (formerly Revulytics)
Compliance Intelligence 		Please use the Case Portal to submit your support ticket or reach out to your Revenera contact.
Book an Appointment
File Upload
Maximum file size allowed is 3 MB.
File type not supported.
Supported file types:
Documents (.txt, .doc, .docx, .pdf), Images (.jpg, .png), Comma Separated Files (.csv) Speadsheets (.xlsx, .xls)
+1.800.374.4353
CONTACT US REVENERA.COM FLEXERA.com
© 2026 Flexera Software. All Rights Reserved.
Privacy policy Terms and conditions Flexera Community Contact Us
Loading
100% CPU on IBM AIX