Hi, Arun, thanks for your suggestion. I have never try to use pthread_self before, but I want to get the thread ID from the hardware, I mean from M5, rather than from software. So what I am really looking for is a structure that can tell me which thread the executing instrution is belong to, of course this structure must inside M5. Thank you !
Veydan > Subject: Re: [m5-users] a simple question about thread ID Hi Veydan, Did you try linking with pthreads library explicitly? I had a problem finding out thread ids without linking explicitly with -lpthread. (I was getting 0's for pthread_self). After linking, I started getting thread id's like 0x4000, 0xc000, etc. Your programs will compile and link even if you don't do -lpthread. Best Regards, arun On Mon, Jun 8, 2009 at 6:07 AM, Veydan Wu <[email protected]> wrote: > > Hi, Lisa, thanks for your reply. I must run my programs on FS mode, each > thread must be associated to a core and there will not be multiple threads > on one core. Is that the only way to distinguish different threads(software > thread) is through cpu_id or context_id ? If I change the thread_id to be > one of the two ids, then I can distinguish different threads, is that right? > Thank you! > > Subject: Re: [m5-users] does M5 support SMT >> >> >> If you must do FS, then you can run a multi-threaded program on a CMP >> rather >> than an SMT platform. You can use the set_affinity syscall to attach a >> particular thread to a particular core. Search the archives, I'm sure it >> has been discussed before on the mailing list. >> Lisa >> >> On Wed, May 27, 2009 at 6:29 PM, Veydan Wu <[email protected]> wrote: >> >> > Thanks, Korey. But I must run my program on FS mode, some of my >> testbenches >> > fail to run on SE mode. >> > >> > Maybe running a multi-thread program on a single cpu core is my only >> > choice, but how to dinstinguish them against each other? Do you have any >> > idea about that? I think M5 run only one thread on one cpu core at a >> time, >> > as all the thread ID are 0. >> >> Subject: Re: [m5-users] a simple question about thread ID >> >> Sorry for the big delay in replying to this, I was just cleaning out my >> inbox and noticed this question. >> What you want is a context_id. Theoretically, in an SMT system there are >> context_ids, which are unique across the system, and cpu_ids, which are >> unique to each core, and thread_ids, which are unique within a core. So, >> if >> you have a 2-core 2-way SMT platform, you'd have cpu_id 0, 1, context_ids >> 0, >> 1, 2, 3, and cpu 0 would have thread 0 and thread 1, and cpu 1 would also >> have thread 0 and thread 1. >> >> If you are running in FS, there is no SMT support so all thread id's will >> be >> 0. What you are looking for is context_id. >> >> Good luck, >> Lisa >> >> > >> > Hi all, I am running a multi-thread program on M5 under ALPHA-FS mode. >> When >> > I tried to get the thread ID, it always return 0, and I cannot >> distinguish >> > them between different threads. I tried to get the thread ID >> > throught the function in thread_state structure, which is supposed to >> return >> > the thread ID. >> > My test program is implemented by POSIX thread library. Should I use the >> > function in the thread_state structure to get the thread ID ? Is those >> > functions supposed to return different thread ID? Sorry for such silly >> > question, but it really confuses me. Thanks! >>
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