Hi all, I am running kmeans via hadoop in gem5 X86 FS mode. I am using linux kernel 3.2.60 with configuration file linux-2.6.28.4 from gem5.org.
I take a checkpoint before a map task and put a "m5 exit" after the map task. I am using *X86kvmCPU* to take checkpoints. When I restore from the same checkpoint, atomic CPU and O3 CPU give me quite different executed instructions: 1) atomic CPU executes about 350 million instructions, reaches "m5 exit", then stops simulation. 2) O3 CPU executes more than 12 billion instructions, and still not reaches "m5 exit" to stop the simulation. I dump out committed PCs from atomic CPU and O3 CPU, finding out that after about 500,000 instructions, the systems behave differently, where atomic CPU is still executing user code, but O3 CPU switch to apic_timer_interrupt(a kernel function, it also appears in atomic CPU execution, but somewhere else). Could anyone please give some advice about why this happen? Thanks. -- Best Regards Yan Zi
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