Hi Yu,
We don't use the memory trace writer much... in fact I just found that
it never made the transition from v1.1 to v2.0 beta, and this is the
first time I know of that anyone has noticed. (Since we rewrote the
memory system interface between those versions, the trace writer needs
to be rewritten too, and no one has bothered.)
If you're using v1.1, then you need to go into your config file and
create either an M5Writer or ITXWriter object (see
python/m5/objects/MemoryTrace.py) and assign it to the mem_trace
parameter of the cache whose accesses you want to trace. It's not
something you can enable purely via the command line.
If you're using v2.0, then my suggestion is just to hack in some code to
write out the address at the top of the handleAccess() method in
src/mem/cache/cache_impl.hh. It's not that complex, and that way you
can output whatever format you'd like. If you don't want to mess around
with adding parameters to the cache to enable/disable tracing for
particular caches (which is admittedly much more complex than it should
be right now... we're working on simplifying that...), then you can just
add some per-cache flags in cache.hh and set them based on the value of
_name in the constructor (which is at the top of cache_impl.hh).
Hope that helps...
Steve
Yu Zhang wrote:
Hi,
I’d like to get the information of memory traffic for an application.
However, when I use command –MemoryTrace.trace=<filename>, there is no
trace file dumped. For a single core processor and only one application
is running, the default thread is 0, isn’t it? So, I don’t need to
specify the parameter “MemoryTrace.thread”, which is 0 by default. I
wonder why the MemoryTrace doesn’t work. BTW: I’m using M5_1.1.
Thanks,
Yu
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