I'm pretty sure this is happening because you're using a fully associative cache, which by default uses fa_lru tags.
I think this bug comes from the fact that numCaches is unsigned, and thus the if (numCaches > 0) check in the ctor always passes. Even though, in your setup, numCaches = floorLog2(size) - 17; will yield a negative number. Then, it tries to allocate a huge amount of memory, i.e., new FALRUBlk *[numCaches]; See the ctor in fa_lru.cc To override FA LRU tags see: http://qa.gem5.org/42/how-to-set-a-fully-associative-l1-cache Anthony Gutierrez http://web.eecs.umich.edu/~atgutier On Tue, Jun 4, 2013 at 10:34 AM, Ali Saidi <sa...@umich.edu> wrote: > ** > > Normally you see a bad_alloc when a program tries to allocate memory and > it can't (because there isn't enough in the system). Could you run the > simulator in the debugger and see where it's actually coming from? > > Ali > > > > > > On 04.06.2013 08:06, Maxime Chéramy wrote: > > Hi, > > I've just updated my instance of gem5 with the last changes from the > mercurial repo. The code still compile properly but when I try to run a > bench in SE mode, it crashes quickly: > > command line: build/X86/gem5.opt configs/example/se.py -n 1 > --cpu-type=timing --caches --l2cache --l1d_size=256B --l1d_assoc=4 > --l1i_size=256B --l1i_assoc=4 --l2_size=16kB --l2_assoc=4 --num-l2caches=1 > -c /home/max/bench/automotive/basicmath/basicmath_small > Global frequency set at 1000000000000 ticks per second > terminate called after throwing an instance of 'std::bad_alloc' > what(): std::bad_alloc > Program aborted at cycle 0 > > My last update was the 28th of February and the exact same command line > was working (I still have a copy of the directory before the update). > > > Do you have any opinion or suggestion? I have not tried yet "scons -c", I > am rebuilding currently. > > > Regards, > > Maxime. > > _______________________________________________ > gem5-users mailing > listgem5-users@gem5.orghttp://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > > > > _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
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