Hello, A quick advice would be running in the FS mode. The SE mode may not support thread switching between cores.
-- Fernando A. Endo, PhD student and researcher Université de Grenoble, UJF France 2014-03-21 5:22 GMT+01:00 Gokul Subramanian Ravi <[email protected]>: > Hi, > > I am trying to run multi-threaded benchmarks using SMT on the SE mode of > gem5. > > > To start off, I used the command (this is multi-program) - > build/X86/gem5.fast configs/example/se.py --ruby --smt -c 'tests/test- > progs/hello/bin/x86/linux/hello;tests/test-progs/hello/bin/x86/linux/hello' > > This gives me errors in the x86 case - > > dependGraph[502]: No producer. consumer: > dependGraph[503]: No producer. consumer: > > and aborts. > > I found this error discussed in some earlier posts as well and I don't know > if there have been any updates (this is the latest gem5 version). So does > this mean I cannot perform SMT in X86 mode? > > My main error I am trying to debug (may be related to the above too) is - > > I have a program that creates n number of threads based on a parameter > passed and I have statically compiled this and linked with the M5 Threads > etc. > > When I run the command, "build/X86/gem5.fast configs/example/se.py --ruby > -n > 3 -cpu_type=detailed -c ../programs/eg_pthread -o "2"" - > I get the expected output. I am in need of 3 cores (number of threads + 1) > and this works fine. > > Now I want to try this in the smt mode - I want to have 1 core and have 2 > (or 3?) threads to do the above process. So my command becomes - > > "build/X86/gem5.fast configs/example/se.py --ruby -n 1 --smt - > cpu_type=detailed -c ../programs/eg_pthread -o "2"" > > In this case I get the error "Called sys_clone, but no unallocated thread > contexts found" > > To debug this, inside the se.py, if I print the value of numThreads, I see > it to be 1. Should this be 2(or 3?) in my case? > > If I get the numThreads right I think I would still need to do something > like "system.cpu[i].workload = [ multiprocesses[0]] * int(numThreads)" > which > is discussed at http://en.it-usenet.org/thread/11778/10994/ but since I'm > having issues with the number of threads I'm not sure how to proceed. > > In summary, I basically want to know how do I run a single program that has > multiple threads (say a Parsec benchmark) on a single core in SE mode using > SMT. I am currently experimenting on X86 but I am open to using any ISA. > > Any help would be appreciated since I've been stuck with this issue for > quite a while now. > > Thanks, > Gokul > > > > > > > > > > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
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