Output of /proc/cpuinfo /proc/stat

[Divino César]

Hello,

I've a Samsung Galaxy SIII with Android 4.1.2 "rooted". I need to measure the CPU usage for some multithreaded applications I've written in C/C++, however I need this information in a per core basis.

I know (due wikipedia, ...) that the Galaxy has a SoC with 4 ARM Cortex A9 however when I do a cat /proc/cpuinfo it doesn't show any information regarding the number of available cores (as usual in any Linux), is this correct behavior?

I've read somewhere that I can use cat /proc/stat to see the per core load average however, in my device, the content of such "file" only shows information for the "core0", again, is this correct or do I need to do something to enable all cores?

I also tried with top and ps without success. I also describe the problem here: http://stackoverflow.com/questions/17177720/how-get-per-core-cpu-usage-on-android-galaxy-siii

----------------- cat /proc/cpuinfo
Processor   : ARMv7 Processor rev 0 (v7l)
processor   : 0
BogoMIPS    : 1592.52

Features    : swp half thumb fastmult vfp edsp neon vfpv3 tls 
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part    : 0xc09
CPU revision    : 0

Chip revision   : 0011
Hardware    : SMDK4x12
Revision    : 000c
Serial      : 11e16f694df1267e


----------------- cat /proc/stat

cpu  89515 1686 23283 464122 3835 2 376 0 0 0
cpu0 74214 457 16736 221609 1111 1 347 0 0 0
intr 1860068 0 0 0 0 0 0 0 0 0 0 .... (removed: a serie of numbers)
ctxt 3138146
btime 1371578546
processes 15904
procs_running 1
procs_blocked 0
softirq 1154788 12 403499 864 4501 12 12 444746 67202 576 233364