How can i know which core is running

[Victorious]

I am running a 4x4 machine. I want to know what core are running in each thread. I even want to know if the 4 core are running on same thread run on same die. Do you have any idea how to do this? I an doing research. Your suggestion would be appreciated.Thank you in advance.

[Amd Athlon]

I should tell you if you do not set affinity, the threads will not be put long enough for a meaningful diagnosis. Even if you have a way it wont stay long. The interesting thing is that the performance depends how you allocate the threads. You can do this by windows task manager or by linux tools taskset or by threading library function call.OPenMP implementation can be provided through typically environment.

[PeterAGASSI]

Even i know i have to set affinity. But what i want to know is that whether the software is able to allocate the core on same die to the thread.Thats why i want to know the brief idea of core and also tell me whether they are on the same die. And task manager for evaluation the performance is not fine sometime it give wrong message. Evaluating the performance is not enough for me at least in this situation.

[Joshua]

Just thinking this might help to you. If you attach a callback routine you can solve half of your problem. In the process you can use OS API to get affinity info. OR you can execute CPUID instruction to ask for current thread context. See that your call back should not alter the affinity setting.Based on APIC ID and its evaluation across OS scheduler quanta you can compare that to a system map of cpu topology. After you have done with you injection study, produce the system topology map after or before it.

[Russell]

It depends on which OS you are using:
The following will run for Vista:
decSpecial(naked) unsigned get_current_procedure()
{

{
mov ecx, 03Bh
lsl eax, ecx
shr eax, 0Eh
return
}
}

For windows xp you can try this:
unsigned idTable;
unsigned idTable_size;

declspecial(thread) unsigned threadCache_idt;
declspecial(thread) unsigned threadCache_proc;

unsigned get_current_processor()
{
#pragma pack(push, 1)
struct IDT_table
{
unsigned short size;
unsigned base;
};
#pragma pack(pop)

IDT_table idt;
sidt(&idt);
if (idt.base != threadCache_idt)
{
for (unsigned i = 0; i != idtTable_size; ++i)
{
if (idtTable[i] == idt.base)
{
threadCache_idt = idt.base;
threadCache_proc = i;
break;
}
}
}
return threadCache_proc;
}

Or:

struct current_proc_table
{
unsigned no;
unsigned time_stamp;
unsigned period;
};

declspecial(thread) current_proc_t current_proc = {0, 0, 1};

declspecial(noinline) void update_current_proc()
{
current_proc_t& cp = current_proc;
cp.time_stamp = *(unsigned*)0x7FFE0000;
cp.period = 10;
unsigned proc;
__asm
{
mov eax, 1;
cpuid;
shr ebx, 24;
mov proc, ebx;
}
cp.no = proc;
}

unsigned get_current_proc(
)
{
current_procr_t& cp = current_proc;
if (0 == --cp.period || cp.time_stamp != *(unsigned*)0x7FFE0000)
update_current_proc();
return cp.no;
}

[PeterAGASSI]

Five great thing you need to know about core. This are the five frequently asked question.
1)Hyper-threading makes two cores seem like four.
2)Core i5 overclocks itself with Turbo Boost.
3)Graphics and memory controllers are built into chip
4)Core i5 blows away core 2 Duo.
5)Core i5 offers a good compromise between low-budget core i3 and high-end core i7.

[Lester Strunk]

Undoubtedly, technology problems hold you and your company back. That's not good for business and as such it's a great idea to get the problems fixed quickly. For several small companies, small business computer support isn't confined to one person within the company; rather, it is tech support that is called in.

============

[Russell]

On windows Vista you can use GetCurrentProcessorNumber(). And on Linux you can use vgetcpu(). On AMD processor you can use RDTSCP (Read Time-Stamp Counter and Processor ID) instruction. RDTSCP is available on Nehalem architecture, too. Description is available in section 16.11.2 of the Intel 64 bit.

[Baltazar]

I am having E1505 which is usually very quietly. And it seem that it is running only on one core. I am havinh AMD atalon X2 dual processor. How I can know that my dual processor is working fine as it was suppose to work. Is there any method or software or program I can use to check that my dual core processor is running properly.