There are other options. You can do things like
foo.clock = 5 * Parent.clock.latency
This would mean that my clock is 5 times the latency of the clock of
any node found above me. And by found above, I mean, "search the
object tree directly above me towards the root until I find something
that matches." This works fine if you have say an L1 cache that is a
child of a CPU, but doesn't work so well if you have a shared L2
because Parent won't find a clock to use.
Another option is to do something like this
base_clock_cycle = 10 #in nanoseconds
def clocks(clocks):
return '%fns' % (clocks * base_clock_cycle)
Then, you can say something like:
foo.clock = clocks(5)
Good luck,
Nate
On Wed, Oct 29, 2008 at 8:55 AM, Ali Saidi <[EMAIL PROTECTED]> wrote:
> Relative to a 2GHz or 4GHz CPU? One thing you could do to make this
> work reasonably easily is change the global tick rate to however fast
> you want to tick your CPU. Then all the latencies could be in terms of
> ticks (e.g. '5t') which would be 5 cycles at 2 or 4GHz. The CPU in
> this case could be 1t.
>
> Another options would be to have a global indicating the desired
> frequency/latency things should be relative to and add a new specified
> that multiplies by that frequency/latency. You would need to modify
> src/python/m5/convert.py to understand your new system and add a new
> character to decode (e.g. '5r' would mean 5 clocks at whatever the
> global clock rate you've specified somewhere is).
>
> For a while we tried to have a 'c' specifier that was relative to the
> CPU the object was part of. However, this quickly became very
> complicated when you have multiple CPUs that could operate at
> different frequencies.
>
> Hope that helps,
>
> Ali
>
>
>
>
> On Oct 29, 2008, at 8:07 AM, Clint Smullen wrote:
>
>> I've not seen any such function, since M5 does not use a global clock
>> rate (only the global tick rate). In your script, however, you can
>> easily add a function that does the conversion.
>>
>> On Oct 29, 2008, at 12:39 AM, Shoaib Akram wrote:
>>
>>> I just want them to be set to constant number of cycles. And change
>>> the frequency. for instancem bridge should queue requets for 5
>>> cycles, at 2GHz or at 4GHz...
>>>
>>> ---- Original message ----
>>>> Date: Tue, 28 Oct 2008 21:22:47 -0700
>>>> From: Ali Saidi <[EMAIL PROTECTED]>
>>>> Subject: Re: [m5-users] specification of delay
>>>> To: M5 users mailing list <[email protected]>
>>>>
>>>> You can specify them is Hz I believe (e.g. 2GHz == .5ns) or are you
>>>> wanting it to be relative to the CPU frequency?
>>>>
>>>> Ali
>>>>
>>>>
>>>>
>>>> On Oct 28, 2008, at 9:15 PM, Shoaib Akram wrote:
>>>>
>>>>> is there a way to easily change the specification of delay for
>>>>> caches, bridges, and memory from 'ns' etc to actual number of
>>>>> cycles.
>>>>>
>>>>> This is useful when comparing across different frequencies since
>>>>> number of cycles remain constant.
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>>>>>
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