Hello, Unfortunately, I don't think gem5 is the right tool for this job. When you run that command, gem5's embedded python interpreter is executing `se.py`. There's not really a way to easily get around this. You could try to compile gem5 without python (--without-python, IIRC), but then configuring the system you're running is difficult, if not impossible, depending on the system you want to simulate.
Cheers, Jason On Thu, Jul 1, 2021 at 6:06 PM Konstantin Serebryany < konstantin.s.serebry...@gmail.com> wrote: > Hi Jason, > > Thanks for the reply! > I was hoping for something light-weight, similar to Unicorn, but based on > gem5 instead of QEMU... > > I tried running > build/X86/gem5.opt configs/example/se.py -c > ./tests/test-progs/hello/bin/x86/linux/hello > and it takes 0.3 second -- too slow. > > The profile shows: > 14.55% gem5.opt libpython3.9.so.1.0 [.] _PyEval_EvalFrameDefault > > > > 2.31% gem5.opt libpython3.9.so.1.0 [.] _PyType_Lookup > > > > 2.01% gem5.opt libpython3.9.so.1.0 [.] > _PyObject_GenericGetAttrWithDict > > > 1.09% gem5.opt libpython3.9.so.1.0 [.] _Py_CheckFunctionResult > > > > 1.06% gem5.opt libpython3.9.so.1.0 [.] 0x00000000002000b0 > > > > ... > I.e. all the time for simulating a tiny test is spent in python. > > I'd like to be able to simulate tiny programs, like "hello" from the > examples, > but hopefully at least 100x faster than this. > > What's the best supported mechanism for running many tiny simulations > w/o having to pay for the large python overhead? > Any examples? > > --kcc > > > > > > > On Thu, Jul 1, 2021 at 5:00 PM Jason Lowe-Power <ja...@lowepower.com> > wrote: > >> Hello, >> >> It's somewhat possible. You can compile gem5 as a library (e.g., scons >> build/<Default build opts>/libgem5-opt.so). However, gem5 *is a python >> interpreter* and is configured via python scripts. Getting that to work >> with an external program is "exciting". It's possible to get python >> working, and there are other workarounds like using the CXXConfig >> interface, but it's not straightforward or easy to understand. >> >> Unless you're trying to integrate gem5 into another simulator, it's >> unlikely that invoking gem5 from another program is the best option. Even >> in this case, I would advise going the other way and using gem5 as the >> driver simulator. That said, there are many simulators that integrate with >> gem5. You can easily hook in things like DRAMSim, at one point I integrated >> it with GPGPU-Sim (this is now incredibly out of date), and there is an >> SST-gem5 bridge that we are actively working on. Finally, there are many >> efforts to integrate gem5 with SystemC including implementing the entire >> SystemC spec in gem5. >> >> Hopefully this helps. I'd be happy to provide more specific help with >> some more information :). >> >> Cheers, >> Jason >> >> On Thu, Jul 1, 2021 at 4:49 PM Konstantin Serebryany via gem5-users < >> gem5-users@gem5.org> wrote: >> >>> Hi, >>> >>> [gem5 newbie here... ] >>> >>> Does gem5 have a C++ API? >>> >>> I am interested in using gem5 as a library, i.e. invoking >>> the system call emulation mode from within my process, >>> without fork/exec or python. >>> Is that at all possible? >>> Any pointers? >>> >>> thanks! >>> >>> --kcc >>> >>> _______________________________________________ >>> gem5-users mailing list -- gem5-users@gem5.org >>> To unsubscribe send an email to gem5-users-le...@gem5.org >>> %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s >> >>
_______________________________________________ gem5-users mailing list -- gem5-users@gem5.org To unsubscribe send an email to gem5-users-le...@gem5.org %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
