Changing the counter type to double is complicated, since it gives
errors during compilation. It seems I'll have to change it in the
functions which uses it too.
I tried using the Stats::Value, but am getting errors. In the stats used
in src/sim/stat_control.cc, which are of type ::Value, like hostSeconds
(which prints out a double at the end), the stats have some .functor
declared in it, which is doing the calculation. I dont know how this
works, and when it gets called, but I was looking for something simpler.
If I declare my stat as a Stats::Value mystat
and then try doing something like mystat += mystat * time_since_access
it gives an error saying that the operator = cannot be assigned to dump()
Is there a simpler way, with a static variable or another global variable
defined in some top level file. I should be able to use that global
variable to keep storing the values every cycle and finally dump it at the
end (maybe assign it to some stat at the end?)
Thanks,
----- Original Message -----
From: "Nathan Binkert" <[EMAIL PROTECTED]>
To: "M5 users mailing list" <m5-users@m5sim.org>
Sent: Monday, October 15, 2007 1:33 PM
Subject: Re: [m5-users] Float in stats
I want to have an accumulator to keep track of a particular system
property. I need to keep adding values to it of type float. Can I use
create a scalar stat, and perform float additions to it?
eg:
my_stat += <some float value>;
Is there a restriction that the stats can only be integers?
Currently, yes. The base statistic is of type Counter which is an
int64_t. You could maybe change the typedef to double in src/sim/host.hh.
(I've never tried this)
Or, is there a way that I can create a global variable of type float, add
value to it, and output it at the end of the simulation. If golbal
variables are not possible, is it possible to create static variables,
which will only init to zero the first time and later on retain their
values, which I can output at the end of the simulation.
Check out Stats::Value and the stat simTicks. I'm not sure if this will
output a float in the end though.
any help is greatly appreciated!
Nate
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