Hi Bhushan, We haven't run across this issue in the context of checkpointing using our infrastructure. However, I did have this problem when I was trying to modify M5, and I believe its caused by scheduling issues in the event queue. I have a couple questions: 1) Have you made any modifications to M5? If so, are they timing related? 2) Are you using the same simulated system and kernel image? Thanks, Joel
---------- Forwarded message ---------- From: Mark Gebhart <mgebh...@cs.utexas.edu> Date: Sun, Apr 4, 2010 at 8:24 PM Subject: Re: [m5-users] Checkpointing PARSEC benchmark in m5. To: Joel Hestness <jthestn...@gmail.com> Hey Joel, I haven't ever seen this error. It looks like from his commands that is doing everything right so I am not sure why it is crashing. Mark On Sun, Apr 4, 2010 at 8:16 PM, Joel Hestness <jthestn...@gmail.com> wrote: > Hey Mark, > Do you have any insights on this? > Thanks, > Joel > > ---------- Forwarded message ---------- > From: Bhushan <mo...@cs.virginia.edu> > Date: Sun, Apr 4, 2010 at 7:22 PM > Subject: Re: [m5-users] Checkpointing PARSEC benchmark in m5. > To: M5 users mailing list <m5-users@m5sim.org> > > > Any thoughts on the crash that I have mentioned? > > On Fri, Apr 2, 2010 at 6:10 PM, ef <snorla...@gmail.com> wrote: >> >> A good explanation can be found here on ROI and checkpoints, also check >> out parsec benchmark code : >> http://www.cs.utexas.edu/~parsec_m5/TR-09-32.pdf >> basically roi region is where all the parallel portion of execution is >> done, exlcuding startup and exit code >> >> >> Ive also heard, take this with a grain of salt running 64 cores and trying >> to restore checkpoint is a bit buggy. I think other people have had similar >> problems. >> >> On Fri, Apr 2, 2010 at 4:03 PM, Bhushan <mo...@cs.virginia.edu> wrote: >>> >>> Hi, >>> I'm trying to use the checkpoint feature in m5 for the benchmarks in the >>> PARSEC suite. In the first run, the checkpoint gets created and in the >>> second run when I try to run in detailed mode using the restore checkpoint >>> option, I get some errors. >>> >>> first run - creating checkpoint - successful. >>> # ./build/ALPHA_FS/m5.opt ./configs/example/fs.py -n 1 >>> --script=./scripts/blackscholes_64c_simdev_ckpts.rcS >>> >>> >>> second run - running in detailed mode: >>> #./build/ALPHA_FS/m5.opt ./configs/example/fs.py --detailed --caches >>> --l2cache --checkpoint-restore=1 -n 1 >>> .............. >>> .............. >>> Switch at curTick count:10000 >>> info: Entering event queue @ 2254485270500. Starting simulation... >>> m5.opt: build/ALPHA_FS/sim/simulate.cc:68: SimLoopExitEvent* >>> simulate(Tick): Assertion `curTick <= mainEventQueue.nextTick() && "event >>> scheduled in the past"' failed. >>> Program aborted at cycle 2254485270500 >>> >>> >>> The benchmarks in the PARSEC suite run fine if I do not use the >>> checkpointing feature. >>> >>> >>> Also, I have been trying to understand how exactly checkpointing is >>> invoked? >>> How does m5 know from which part the ROI starts? Where does (in the >>> scripts) m5 create a checkpoint? If these questions sound repetitive, could >>> anyone point me to the mailing list discussions that explain checkpointing >>> (references to checkpointing in mail archive seem to explain specific cases >>> instead of the general working)? >>> >>> -- >>> Regards, >>> Bhushan >>> >>> _______________________________________________ >>> m5-users mailing list >>> m5-users@m5sim.org >>> http://m5sim.org/cgi-bin/mailman/listinfo/m5-users >> >> >> _______________________________________________ >> m5-users mailing list >> m5-users@m5sim.org >> http://m5sim.org/cgi-bin/mailman/listinfo/m5-users > > > > -- > Regards, > Bhushan > > _______________________________________________ > m5-users mailing list > m5-users@m5sim.org > http://m5sim.org/cgi-bin/mailman/listinfo/m5-users > > > > -- > Joel Hestness > PhD Student, Computer Architecture > Dept. of Computer Science, University of Texas - Austin > http://www.cs.utexas.edu/~hestness > -- Joel Hestness PhD Student, Computer Architecture Dept. of Computer Science, University of Texas - Austin http://www.cs.utexas.edu/~hestness
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