How would i go about determining how many cpu's are online? I have a handler running every 1000 ms reading the current frequency and i also want to determine how many cores are online.
I've been looking through the directory "/sys/devices/system/cpu/". I've monitored "/sys/devices/system/cpu/cpu1/online" which is always 1, i've monitored /cpu0/online which is also always 1.
Is this information kernel/device specific? How can i find how many cores are online in a way that works on all devices?
edit: Runtime.availableProcessors() seems to work nicely, i'm still interested in knowing if there is a system file that tells you if a core is on/off?
I have success with availableProcessors() on the devices I have tried. A more detailed description of the function is available in the official Java doc. Another possible solution is described in this forum post.