Hi Menglong,
When it comes to DRAMSim2, the wrapper ignores the clock in gem5 and gets all
the information from the ini file. Thus, it is solely up to the configuration
file what clock is used. The wrapper has a default DDR3 config, but you can
change it if you want.
As a side note, the built-in gem5 DRAM controller is roughly 7x faster than
DRAMSim2, and is easier to use. See our ISPASS’14 paper: Simulating DRAM
controllers for future system architecture exploration. You find a link on the
gem5 Publications page.
Thanks,
Andreas
From: Menglong Guan via gem5-users
<[email protected]<mailto:[email protected]>>
Reply-To: Menglong Guan
<[email protected]<mailto:[email protected]>>, gem5 users mailing
list <[email protected]<mailto:[email protected]>>
Date: Monday, July 14, 2014 at 6:54 PM
To: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Subject: [gem5-users] How to run binary in multi-core system and what is
system.clk_domain.clock frequency?
Dear All,
I am new to gem5. It will be very helpful if you can give me an answer or a
suggest link that I need to read.
I want to run SPEC2006 benchmark in se.py mode, and select dramsim2 as the
memory mode. The number of cpus is 4. However, the stats.txt results show that
all results for cpu1-3 are all 0, such as “system.cpu1.numCycles”. I checked
config.ini file. The workload for cpu1-3 are all
“workload=system.cpu0.workload”. So my question 1 is whether this select
benchmark, bzip2, is working in 4 cpus multi-cores system or just working in
cpu0? Do I need to run in o3 mode?
Another question 2 is what is the clk_domain for dramsim2 memory? I checked
config.ini file the [system.mem._ctrls] said “type=DRAMSim2
clk_domain=system.clk_domain” And the stats.txt result shows
“system.clk_domain.clock 1000 # Clock period in ticks” Does this
mean dramsim2 dram mode works in 1000*1 picosecond? What is the frequency?
Command line:
./build/X86/gem5.opt ./configs/example/se.py –I 100000000 –n --mem-channels=4
–caches --l2cache --l2_size=1MB --mem-size=4096MB --mem-type=dramsim2
--cpu-type=timing -c
$SPEC/benchspec/CPU2006/401.bzip2/exe/bzip2_base.gcc43-64bit
--options=$SPEC/benchspec/CPU2006/401.bzip2/data/all/input/input.program
Thanks,
Menglong
--
Menglong Guan
M.S. Student
Department of Electrical & Computer Engineering
University of Connecticut
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