Hi Marc, I think we would be amenable to both, it's just a question of creating the patches, getting them reviewed and committing them.
Thanks, Ali On Apr 20, 2012, at 2:17 AM, Marc Orr wrote: > Jayneel recently submitted a patch that allows se.py to handle > multi-threading. I have a couple more ideas for some patches related > to multi-threading in se mode. > > 1. Most people probably use the m5threads library to do multithreading > in syscall emulation mode. There is a comment in the README > distributed with m5threads that basically says it should be built such > that it avoids making futex system calls (see below). At AMD, where > I'm currently interning, we have a patch of code that Dan Sanchez (the > m5threads author) wrote that basically implements the futex system > call. It seems like it would be beneficial to push this to the public > repo so that m5threads will work with or without futexes. > > "This library should compile with GNU toolchains implementing > LinuxThreads (Linux <=2.4 or 2.6) or NPTL (2.6 only) pthreads. If you > compile it with an NPTL glibc, you may get futex() system calls if you > try to do concurrent calls to multithreaded-safe glibc functions (e.g. > printf). These are unimplemented in M5. To avoid them, enclose these > calls in a global lock. Additionally, NPTL apps tend to use more > system calls, so it is recommended to use M5 with a glibc compiled > with LinuxThreads. Performance should be practically identical with > both versions, as we are substituting the threading library." > > 2. There are regression tests for m5threads that run on the SPARC ISA. > It would be nice to have a regression test for m5threads that runs on > x86. Also, if people are amenable to adding the futex system call, it > would be nice if the m5threads regression tester tested that as well. > > Thanks, > Marc > _______________________________________________ > gem5-dev mailing list > [email protected] > http://m5sim.org/mailman/listinfo/gem5-dev > _______________________________________________ gem5-dev mailing list [email protected] http://m5sim.org/mailman/listinfo/gem5-dev
