The simulator. As in different cores of the simulated system are
simulated on different threads of the host system.
--
Nilay
On Thu, 4 Dec 2014, Gabe Black via gem5-dev wrote:
This is somewhat tangential, but are you saying the simulator is
multithreaded now? Or just your simulation?
Gabe
On Thu, Dec 4, 2014 at 10:03 AM, Andreas Sandberg via gem5-dev <
gem5-dev@gem5.org> wrote:
On 04/12/14 16:10, Nilay Vaish via gem5-dev wrote:
I have been trying to run ht kvm cpu when using multiple cores. With
single threaded simulation, the simulation stops making progress if the
simulated system has more than 4 cores. With multi-threaded simulation, I
do not see any progress even when two cores are being simulated. For the
multi-threaded simulation, I made the following changes as suggested in
the comment for the changeset: 10157:5c2ecad1a3c9. So, how many cores
have others tested kvm cpu with? Is there something that I might not be
doing right?
I reported scalability numbers up to 8 cores for one of the Splash 2
benchmarks in my thesis, so 8 cores definitely work. IIRC, I tested it
on 32 cores as well, but I didn't report those numbers.
There are three issues you might be running into:
* There might be devices (CPU child objects) that don't live in the
right thread.
* The quantum might be too large (I never managed to get anything more
than 1ms to work).
* Newly introduced bugs.
The code fragment I used in my old scripts was something like this:
if not no_kvm and cpus > 1:
test_sys.eventq_index = 0
for idx, cpu in enumerate(test_sys.cpu_boot):
for obj in cpu.descendants():
obj.eventq_index = test_sys.eventq_index
cpu.eventq_index = idx + 1
The fragment above ensures that any descendants of the CPU are assigned
to the device thread and only the CPU lives in a separate thread.
//Andreas
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