Hi Andreas,
You did not respond to my previous mail, hope you reply to this. I went
through the mail archive regarding CommMonitor. I tried again changing
BaseCPU.py as:
self.toL2Bus.master = self.l2cache.cpu_side
self._cached_ports = ['l2cache.mem_side']
self.monitor = CommMonitor()
self.monitor.stackdist = StackDistProbe(verify = True)
self.l2cache.cpu_side = self.monitor.master
self.monitor.slave = self.l2cache.mem_side
I re-compiled and tried to run an example but received the following error:
fatal: system.monitor.stackdist without default or user set value
For reference my command line was:
build/X86/gem5.debug --debug-flag=StackDist --stats-file=hello.txt
--dump-config=hello.ini --json-config=hello.json configs/example/se.py
--num-cpus=1 --cpu-type=DerivO3CPU --caches --l1i_size=32kB --l1d_size=32kB
--l2cache --num-l2caches=1 --l2_size=256kB --l2_assoc=4 -c
'tests/test-progs/hello/bin/x86/linux/hello;'
Can you help me out where am making the mistake.
Thanks,
Bhaskar
On Fri, Nov 6, 2015 at 5:03 AM, Bhaskar Kalita <[email protected]>
wrote:
> Hi Andreas
>
> I want to measure the stack distance for l2 cache. So, tried to place the
> CommMonitor between toL2Bus.master and l2cache.cpu_side in BaseCPU.py as:
>
> #self.toL2Bus.master = self.l2cache.cpu_side
> #self._cached_ports = ['l2cache.mem_side']
> self.l2MONITOR = CommMonitor()
> self.l2MONITOR.stackdist = StackDistProbe(verify = True)
> self.toL2Bus.master = self.l2MONITOR.slave
> self.l2MONITOR.master = self.l2cache.cpu_side
> self._cached_ports = ['l2cache.mem_side']
>
> I tried assigning a StackDistProbe to the comm monitor as:
>
> stackdist = Param.StackDistProbe(NULL)
>
> I re-compiled as scons build/X86/gem5.debug. It worked fine. The error I
> got while trying to run an example was
>
> Traceback (most recent call last):
> File "<string>", line 1, in <module>
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/main.py",
> line 389, in main
> exec filecode in scope
> File "configs/example/se.py", line 286, in <module>
> Simulation.run(options, root, system, FutureClass)
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/configs/common/Simulation.py",
> line 583, in run
> m5.instantiate(checkpoint_dir)
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/simulate.py",
> line 114, in instantiate
> for obj in root.descendants(): obj.createCCObject()
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/SimObject.py",
> line 1453, in createCCObject
> self.getCCParams()
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/SimObject.py",
> line 1400, in getCCParams
> value = value.getValue()
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/SimObject.py",
> line 1457, in getValue
> return self.getCCObject()
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/SimObject.py",
> line 1435, in getCCObject
> params = self.getCCParams()
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/SimObject.py",
> line 1400, in getCCParams
> value = value.getValue()
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/params.py",
> line 248, in getValue
> return [ v.getValue() for v in self ]
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/SimObject.py",
> line 1457, in getValue
> return self.getCCObject()
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/SimObject.py",
> line 1435, in getCCObject
> params = self.getCCParams()
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/SimObject.py",
> line 1400, in getCCParams
> value = value.getValue()
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/SimObject.py",
> line 1457, in getValue
> return self.getCCObject()
> File
> "/home/bhaskar/Downloads/gem5-stable-a48faafdb3bf/src/python/m5/SimObject.py",
> line 1439, in getCCObject
> % self.path()
> RuntimeError: system.monitor.stackdist: Cycle found in configuration
> hierarchy.
>
>
> Can you please explain if I need to modify se.py for my purpose? Please
> help me out through this as I am very new to gem5.
>
>
> Thanks
>
> Bhaskar
>
>
>
>
>
> On Thu, Nov 5, 2015 at 1:50 PM, Andreas Hansson <[email protected]>
> wrote:
>
>> Hi Bhaskar,
>>
>> Have a look at tests/config/tgen-simple-mem.py.
>>
>> The comm monitor has a master and a slave port, and you need to connect
>> it “between” two other modules. There are plenty examples on the mailing
>> list for adding it between the L1 and L2, for example by changing
>> BaseCpu.py (if you do, remember to recompile). Once you have instantiated
>> the comm monitor, and connected it, run an experiment and make sure you get
>> the stats in the stats.txt output. Also, if you install pydot, you can see
>> the system topology in m5out/config.dot.pdf or config.dot.svg (the latter
>> even has mouseover tooltips etc).
>>
>> When the things above are working, just assign a StackDistProbe to the
>> comm monitor, as done in tests/config/tgen-simple-mem.py.
>>
>> Good luck.
>>
>> Andreas
>>
>> From: gem5-users <[email protected]> on behalf of Bhaskar
>> Kalita <[email protected]>
>> Reply-To: gem5 users mailing list <[email protected]>
>> Date: Wednesday, 4 November 2015 at 20:23
>> To: gem5 users mailing list <[email protected]>
>> Subject: Re: [gem5-users] How to use stack distance calculator in gem5.
>>
>> Hi Andreas,
>>
>> Thanks for your response. Can you please tell me how to instantiate the
>> probe. I tried modifying the se.py file as:
>>
>> # Create a separate clock domain for the CPUs
>> system.cpu_clk_domain = SrcClockDomain(clock = options.cpu_clock,
>> voltage_domain =
>> system.cpu_voltage_domain)
>>
>> # to calculate stack distance
>> system.monitor = CommMonitor()
>> system.monitor.stackdist = StackDistProbe(verify = True)
>>
>>
>> And also changed BaseCPU.py as:
>>
>> def addTwoLevelCacheHierarchy(self, ic, dc, l2c, iwc = None, dwc = None):
>> self.addPrivateSplitL1Caches(ic, dc, iwc, dwc)
>> self.toL2Bus = L2XBar()
>> self.connectCachedPorts(self.toL2Bus)
>> self.l2cache = l2c
>> self.toL2Bus.master = self.l2cache.cpu_side
>> self._cached_ports = ['l2cache.mem_side']
>>
>> # to calculate stack distance
>> self.l2MONITOR = StackDistProbe(verify = True)
>> self._cached_ports = self.l2MONITOR.slave
>> self.l2MONITOR.master = l2cache.mem_side
>>
>> When I tried to run my program I got an error as "fatal: Communication
>> monitor is not connected on both sides."
>> Can you please tell me if I am approaching in the right direction and
>> what are the other things to be done.
>>
>> Thanks
>>
>>
>>
>> On Mon, Nov 2, 2015 at 2:10 PM, Andreas Hansson <[email protected]>
>> wrote:
>>
>>> Hi Bhaskar,
>>>
>>> There are a few steps you need to take, and it involves a few
>>> widely-adopted gem5 concepts:
>>>
>>> - First, the stack distance calculator is a probe, and the output is in
>>> the shape of gem5 stats. Thus, you need to instantiate the probe, and
>>> attach it to a probe point.
>>>
>>> - Second, to be able to attach the probe in various locations in the
>>> memory system (core to L1, before the L2, in front of the system memory),
>>> we use a module called a CommMonitor, which has a bunch of generic stats,
>>> but also suitable packet probe points.
>>>
>>> Consequently, you need to modify your script that assembles and
>>> configures the system, in your case se.py, and instantiate a CommMonitor,
>>> connect it where you want to monitor the communication, then instantiate a
>>> StackDistProbe and attach it to the monitor you just instantiated. The bad
>>> news is that it involves quite a few steps. The good news is that these are
>>> all things you will need to do as a gem5 user in any case, so better get
>>> used to it :-).
>>>
>>> For an example, have a look at one of the regression scripts,
>>> tests/config/tgen-simple-mem.py. This script includes both trace
>>> generation, and calculation of stack distance. Note that you don’t need to
>>> set "verify = True" on the StackDistProbe. If you do you will calculate the
>>> stack distance both using a clever algorithm, and a “naïve” stack which is
>>> a lot slower.
>>>
>>> Andreas
>>>
>>>
>>> From: gem5-users <[email protected]> on behalf of Bhaskar
>>> Kalita <[email protected]>
>>> Reply-To: gem5 users mailing list <[email protected]>
>>> Date: Sunday, 1 November 2015 at 22:08
>>> To: "[email protected]" <[email protected]>
>>> Subject: [gem5-users] How to use stack distance calculator in gem5.
>>>
>>> Hi
>>> I am Bhaskar. I am a final year B.E student. For my final year project I
>>> am using the gem5 simulator. I need to collect the stack distance of
>>> programs using gem5. I used the --debug-flag="StackDist", but it did not
>>> print anything. I also tried setting the verifyStack flag in
>>> mem/stack_dist_calc.hh to true as:
>>> // Flag to enable verification of stack. (Slows down the simulation)
>>> const bool verifyStack=true;
>>> but it did not work too. For reference this is the command line am
>>> usuing:
>>> build/X86/gem5.debug --debug-flag='StackDist' --debug-file='sdp.trc.gz'
>>> --stats-file=forij.txt --dump-config=for.ini --json-config=for.json
>>> configs/example/se.py --num-cpus=1 --cpu-type=DerivO3CPU --caches
>>> --l1i_size=32kB --l1d_size=32kB --l2cache --num-l2caches=1 --l2_size=256kB
>>> --l2_assoc=4 -c "bench/x86/forij;"
>>>
>>> Can you please guide me through my problem and tell me to do the
>>> necessary steps.
>>>
>>> Thanks for your support
>>>
>>> -Bhaskar
>>>
>>>
>>>
>>> ------------------------------
>>>
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>>
>>
>> ------------------------------
>>
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>> confidential and may also be privileged. If you are not the intended
>> recipient, please notify the sender immediately and do not disclose the
>> contents to any other person, use it for any purpose, or store or copy the
>> information in any medium. Thank you.
>>
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>
>
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