Does anyone know for sure that Ruby cycles are incremented by 1 or the same orders? Or it is incremented in the order of hundreds or thousands of cycles.
Thanks,
Carole
On Thu, Apr 10, 2008 at 10:13 AM, Dan Gibson < degibson@xxxxxxxx> wrote:
Grep through the code for SIMICS_unstall_proc(). Add a hack -- instead
of just un-stalling, call SIMICS_stall_cycle( DESIRED_LATENCY -
ELAPSED_LATENCY ).
Carole-Jean Wu wrote:
Hello Dan,
although I still want to take the original miss/hit latency of L1 into
account...
-Carole
On Thu, Apr 10, 2008 at 10:05 AM, Dan Gibson
< degibson@xxxxxxxx>
wrote:
If you want to decide what the latency is (i.e. not let Ruby proper
decide), have a look at what the PERFECT_MEMORY_SYSTEM flag does.
Regards,
Dan
Carole-Jean Wu wrote:
Hello Dan,
>From my understanding of issueRequest, only cache misses go there
right?
Do you have suggestions how to tackle this problem? Why would my added
latency be canceled out by Ruby's event queue? I tried to increase the
latency to e.g. 40000 something big, and I will start seeing some
variation in CPI.
Thanks!
Carole
On Thu, Apr 10, 2008 at 9:39 AM, Dan
Gibson
< degibson@xxxxxxxx>
wrote:
My first guess is that
your
latency is cancelled by Ruby's periodic
processing of its event queue. E.g. if you stall a request by 10 cycles
in the sequencer, then Ruby's event queue runs (to simulate the cache
hierarchy) 2 cycles later, decides the request was a hit, and unstalls
the processor, with a net stall time of just 2 cycles.
Regards,
Dan
Carole-Jean Wu wrote:
Hello GEMS-users,
I am running into a strange situation when simulating a multiprogrammed
environment. To make the long story short,
in Sequencer.C's issueRequest, I am adding additional latency to
"latency" to mimic e.g. a cache hit, latency+=10 and a cache miss,
latency+=100. However, when running two applications with great
differences on miss ratio, I've find the same CPI in the ruby0.dumpstat
file.
Can someone explain to me what is going wrong? Am I inserting this
additional latency in the wrong place?
Any help is greatly appreciated!
Thanks a lot,
Carole
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