C++ Application CPU Usage goes to 800% in a(Quad CPU) in RHEL 64 bit kernel

[chilukuri_sastry]

Hi I am facing an high CPU Usage 800% in a(Quad CPU, RHEL 64 bit kernel) with my C++ application . THe details are below:
1) The C++ Application has been compiled in RHEL (2.6.9-42.ELsmp #1 SMP Wed Jul 12 23:27:17 EDT 2006 i686 i686 i386 GNU/Linux)32 bit server(Quad CPU – 8 cpu) in Dev lab. When this application has been tested for 12 hrs in the Dev lab, the CPU usage is varying between 20% to 50% .
However, when the above C++ application deployed in production which is RHEL (2.6.9-67.ELsmp #1 SMP Wed Nov 7 13:56:44 EST 2007 x86_64 x86_64 x86_64 GNU/Linux)64 bit server the CPU usage is found to be increasing constantly to 800%.
2) When the CPU reached to 800% in Production Server, we have taken the pstack of the C++ Application process by using the command “pstack –p [captured thread id ]” and we found that the pstack is showing the high CPU usage (800%) in below libraries:
#0 0xffffe410 in __kernel_vsyscall ()
#1 0x00798cf6 in pthread_cond_wait@@GLIBC_2.3.2 ()
#2 0x08051233 in CxOsEvent::WaitForEvent ()
#3 0x0818deae in workerThread::ThreadProc ()
#4 0x007963cc in start_thread () from /lib/tls/libpthread.so.0
#5 0x006281ae in clone () from /lib/tls/libc.so.6


Please let us know if there is any GLIB /pthread library/any other differences between 32 bit and 64 bit kernel. Since the application has been compiled in a 32 bit kernel and deployed in 64 bit kernel. Please provide your support on the same.

[Rubberman]

What happens if you compile it on the 64bit system? If you do that and its CPU utliization drops to reasonable levels, then you know it is probably the 32-bit libraries on the 64-bit system that are the problem, else some subtle interaction with the 64-bit kernel.