Re: Setting physical CPU for a task
Adam Lackorzynski <[email protected]>
| Newsgroups | gmane.comp.micro-kernel.l4.devel |
|---|---|
| Message-ID | <[email protected]> |
On Mon Aug 05, 2013 at 21:50:55 +0300, Lluís 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 -- Adam [email protected] Lackorzynski http://os.inf.tu-dresden.de/~adam/