Hello,
I am confused by the different IPC obtained when I run exactly the same
checkpoint.
Detials:
1. create checkpoint.
script.sh
#!/bin/bash
# create checkpoint w1
# benchmarks:
# 445.gobmk
# 458.sjeng
# 403.gcc
# 444.namd
#445.gobmk
cd
/root/spec2006/benchspec/CPU2006/445.gobmk/run/run_base_ref_x86_64-gcc43.0001
taskset -c 0 ./gobmk_base.x86_64-gcc43 --quiet --mode gtp < nngs.tst&
#458.sjeng
cd
/root/spec2006/benchspec/CPU2006/458.sjeng/run/run_base_ref_x86_64-gcc43.0001
taskset -c 1 ./sjeng_base.x86_64-gcc43 ref.txt&
#403.gcc
cd
/root/spec2006/benchspec/CPU2006/403.gcc/run/run_base_ref_x86_64-gcc43.0001
taskset -c 2 ./gcc_base.x86_64-gcc43 166.i -o 166.s&
#444.namd
cd
/root/spec2006/benchspec/CPU2006/444.namd/run/run_base_ref_x86_64-gcc43.0000
taskset -c 3 ./namd_base.x86_64-gcc43 --input namd.input --iterations 38
--output namd.out&
cd /root
sleep 5m
./create_checkpoint w1 ; ./start_sim
Then I just use the original marss (an old version) and run this
checkpoint twice
run command:
qemu/qemu-system-x86_64 -m 8G -hda diskimage.qcow2 -loadvm w1 -simconfig
running.cfg
after the simulation done, the output from the terminal:
Stopped after 58914145 cycles, 100000000 instructions and 550 seconds of
sim time (cycle/sec: 107116 Hz, insns/sec: 181818, insns/cyc: 3.8035957899)
I simply take IPC = insns/cycle = 3.8035...
But in two times I run same simulation, the result is quite different.
second is 3.5198.
Is there anything wrong with my simulation?
Thanks,
Kuniors
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