On Mon Aug 05, 2013 at 21:50:55 +0300, LluĂs Vilanova wrote:
I've been unable to see if moe's config files allow to start tasks pinned to a specific CPU, and after running the "thread_migrate" example, looks like only one CPU (CPU00) is always used:
$ make -C obj/l4/amd64/ qemu E=thread_migrate QEMU_OPTIONS="-serial stdio -vnc ::59000 -smp 2" [...] Not using serial hack in slow timer handler. CPU[0]: AuthenticAMD (6:2:3:0)[00000623] Model: QEMU Virtual CPU version 1.5.1 at 3092MHz
255/512 Entry I TLB (4K pages) 255 Entry I TLB (4M pages) 255/512 Entry D TLB (4K pages) 255 Entry D TLB (4M pages) 64 KB L1 I Cache (2-way associative, 64 bytes per line) 64 KB L1 D Cache (2-way associative, 64 bytes per line) 512 KB L2 U Cache (8-way associative, 64 bytes per line)
Freeing init code/data: 20480 bytes (5 pages) [...] Ned says: Hi World! Ned: loading file: 'rom/thread_migrate.cfg' migrate | Found 4 CPUs. migrate | Created 12 threads. migrate | Migrated Thread00 -> CPU00 migrate | Migrated Thread01 -> CPU00
I've modified "src/l4/conf/modules.list" to add the "thread_migrate" test, and I'm using l4re-snapshot-2013060718, with multiprocessing (with a maximum of 4) enabled on fiasco.
Looks like the benchmark always detects (L4::Scheduler::info) the number of maximum CPUs configured in fiasco, but not the number of CPUs provided by QEMU (only CPU 0 is online).
That it finds 4 is on purpose because more CPUs could come up. Does it work giving Qemu '-cpu core2duo'?
Am I missing some step to set all CPUs online? Is it possible to have MOE start tasks pinned to a specific CPU?
See the (commented out) "scheduler = ... " settings in, e.g., x86-fb.cfg and give a fourth parameter, which is a CPU mask. You can check in the kernel debugger on which CPU a thread is (via lp command).
Adam