Hi, Iam not sure u are talking about multi-programmed or multithreaded?.
Multithreaded workloads which i thing you need in your case, as your using the single OOO core to behave as both OOO and InO at run time based on number of threads(if i understood correctly). Multithreaded workloads(splash or parsec etc) are much easier to run in FS mode than SE mode. Line 4 u mentioned above is for multipogrammed workloads gem5 does not full fledged InO model and not well supported. Your best best is to make the O3 model in gem5 as InO core. Sudarshan Graduate student Electrical Engineering Univ of Massachusetts Amherst On Wed, Mar 19, 2014 at 10:09 AM, Gokul Subramanian Ravi <[email protected]>wrote: > Hi, > > I am new to gem5 and am working on implementing the concept of a single > core > that has the capability of an OOO and an in-order processor and the > functionality switches between the two based on number of threads available > to the core to exploit SMT. I have a query regarding the SMT mode which I > was unable to figure out by looking through the gem5 discussion groups. I > am > not too specific about which ISA to implement this on. Most probably Aplha > or x86. > > 1. From what I have learned so far, the stable version of gem5 supports > multi-threading in the SE mode but not in the FS mode. So in order to try > out the experiment described above I would need to use the SE mode. Am I > right so far? > > 2. Now while running in the SE mode, I see that the number of cores I give > should equal the number of threads I am running, since there is no > scheduling happening. In this case each core runs a single thread. Now I'm > a > bit confused here since if I want to exploit SMT, I would need to have > multi-threads on a single core right? Do I need to integrate some sort of a > scheduler then? > > 3. I explored a bit about the M5Threads library which enables support for > threading, but this still does not enable me to run more threads on a > single > core I think. > > 4. I came across the following line on the gem5 site - " If you're using > the > O3 model, you can also assign a vector of workload objects to one CPU, in > which case the CPU will run all of the workloads concurrently in SMT mode." > - Does this solve the issue I have written about above, I am unsure about > this. > > 5. Also regarding the same line I have pasted above, is it only the O3 > model > which supports SMT or can the in-order CPU use this as well. I am looking > to > use say a 6-way or 8-way SMT if possible. > > Any help is greatly appreciated. Thanks in advance! > > > > Thanks, > > Gokul > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
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