On 2/24/2023 11:31 AM, Priyanka Ankolekar via gem5-users wrote:
Hi Eliot,
I am trying to correlate my gem5 RISCV configuration with a RISCV RTL design
for a certain benchmark.
I would like to plot /retired instructions versus ticks/ to make sure that both (gem5 and RTL) are
(mostly) performing the same operations. (I already have this plot from RTL).
Is there a way to do that in gem5? Or are there other profiling tools that will
help me get this data?
I thought this was already answered. You can simply examine a dump. The
amount of time, in ticks, is given on the simTicks line. While the length of
time of one tick can be changed, it is usually one picosecond (1/1000 of a
nanosecond) so that everything can be expressed as an integral number of
ticks. But you can check that by examining the simFreq line in the dump. If
you such for committedInsts, then that tells you the number of committed
instructions for each cpu, which would match the number retired (except maybe
for a small number that were committed but not retired at the precise moment
the dump was taken). You can also search for cpi and ipc for each processor,
and total, namely cycles per instruction and instruction per cycle. Note that
*cycle* is a processor clock cycles, not a *tick*. The line with
cpu_clk_domain.clock will tell you how many ticks per clock there are. And
there is also numCycles that gives you the number of cycles directly.
cpi is numCycles / committedInsts, and ipc is 1/cpi.
Is this what you were looking for, or something different that I have somehow
not understood?
EM
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