Hello, As a rule of thumb, *ComSize should be greater than any *Delay parameter. Time buffers are communication queues between stages, used to mimic substages and deeper pipelines than 7 or so.
Regards, -- Fernando A. Endo, Post-doc INRIA Rennes-Bretagne Atlantique France 2016-04-17 16:28 GMT+02:00 Abhishek Rajgadia <[email protected]>: > I made some changes to architecture in gem5. It runs fine for 8wide > architecture. But when I change the configuration to 4 wide, the simulation > crashes after some time with following message: > > gem5.debug: build/ARM/cpu/timebuf.hh:55: void TimeBuffer<T>::valid(int) > const [with T = DefaultIEWDefaultCommit<O3CPUImpl>]: Assertion `idx >= > -past && idx <= future' failed. > Program aborted at cycle 538173163500 > Aborted (core dumped) > > gdb backtrace is: > > #3 0x00007f585348ec32 in __assert_fail () from > /lib/x86_64-linux-gnu/libc.so.6 > #4 0x00000000012868b9 in TimeBuffer<DefaultIEWDefaultCommit<O3CPUImpl> > >::valid (this=0x58c5580, idx=6) > at build/ARM/cpu/timebuf.hh:54 > #5 0x00000000012874ac in TimeBuffer<DefaultIEWDefaultCommit<O3CPUImpl> > >::calculateVectorIndex (this=0x58c5580, idx=6) > at build/ARM/cpu/timebuf.hh:198 > #6 0x00000000012c107c in TimeBuffer<DefaultIEWDefaultCommit<O3CPUImpl> > >::operator[] (this=0x58c5580, idx=6) > at build/ARM/cpu/timebuf.hh:220 > #7 0x00000000012bacd0 in DefaultIEW<O3CPUImpl>::instToCommit > (this=0x58bf0b0, inst=...) at build/ARM/cpu/o3/iew_impl.hh:617 > #8 0x00000000012be2cd in DefaultIEW<O3CPUImpl>::executeInsts > (this=0x58bf0b0) at build/ARM/cpu/o3/iew_impl.hh:1377 > #9 0x00000000012bffde in DefaultIEW<O3CPUImpl>::tick (this=0x58bf0b0) at > build/ARM/cpu/o3/iew_impl.hh:1604 > > > Please explain how timebuffer works? What are idx, past and future > variables in timebuffer? > I would be grateful for any help. > > -- > Regards, > Abhishek Rajgadia > Electrical Engineering, > IIT Bombay > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
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