In terms of fetching, Note the O3 is fetching a cache line at a time not a instruction at a time. So theoretically, you only need to fetch one 64-byte line to "fetch" 8 instructions....
On Fri, Oct 2, 2009 at 10:24 PM, ef <[email protected]> wrote: > Hello, > > I am testing Blackscholes 2.1 on M5. Alpha FS Mode. It seems that the > IPC is pretty low around .73, I noticed that the fetching rate is > pretty low , avg fetch of .98 per cycle, out of a 4 wide machine. > Going through traces, everything seems normal except: I get messages > like this doing certain spots, which I believe is the culprit: > > 8039402330674: system.detail_cpu1.fetch: Running stage. > 8039402330674: system.detail_cpu1.fetch: There are no more threads > available to fetch from. > > This happens for several cycles, then fetching appears normal. > > Right now I have two cores running two threads. Is there anyways I can > find out more about whats going on? > > Thanks, > EF > _______________________________________________ > m5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/m5-users > -- - Korey
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