Description

The simulator periodically (after a fixed amount of processed instructions) outputs statistics to stdout. The statistic consists of (1) cache and TLB hit/miss rations for each core, and (2) a histogram of all trajectories of a page walk (together with normal cache stats). Each trajectory consists of four steps corresponding to page walk accesses. Each value in a trajectory means the source from where the corresponding page table node was fetched in the memory hierarchy. An example output can be found in ./example/mcf.res

The trajectories data can be processed by a side script to calculate the page walk latency statistics. For now, we are not providing the scripts for calculating the page walk latency statistics.

Building and running instructions

0. Build Docker environment

sudo docker build -t dynamorio . 
sudo docker run -it -v `pwd`:/dynamorio -v dynamorio:latest /bin/bash

1. Set up environment variables

source source.sh

2. Install/Build the tracer

./install.sh

3. Run the simulator

# bin64/drrun -t drcachesim -qemu_mem_trace ../mmu_1M.log 2>&1 | tee ../mmu_dyna_1M.log

# debug run
bin64/drrun -t drcachesim -qemu_mem_trace /linux_gen_ECPT/walk_log.bin -arch ecpt -verbose 5 > ../dyna.log 2>&1

3. Run the simulator Example:

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

# SETTTINGS
TRACE_DIR=/disk/local/traces/mcf/ #should point to where the traces have been stored
OUTPUT_FILE=./example/mcf.res

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

TRACE=$(find $TRACE_DIR -maxdepth 1 -name "drmemtrace*" -type d)
$SIMULATOR_DIR/build/bin64/drrun -t drcachesim \
                    -indir $TRACE \
                    -pt_dump_file $TRACE_DIR/pt_dump \
                    -warmup_refs     300000000                   \
                    -TLB_L1I_entries 64                          \
                    -TLB_L1I_assoc   8                           \
                    -TLB_L1D_entries 64                          \
                    -TLB_L1D_assoc   8                           \
                    -TLB_L2_entries  1024                        \
                    -TLB_L1D_assoc   8                           \
                    -L1I_size  $(( 32 * 1024 ))                  \
                    -L1I_assoc 8                                 \
                    -L1D_size  $(( 32 * 1024 ))                  \
                    -L1D_assoc 8                                 \
                    -L2_size   $(( 256 * 1024 ))                 \
                    -L2_assoc  8                                 \
                    -LL_size   $(( 16 * 1024 * 1024 ))           \
                    -LL_assoc  16                                \
                    > $OUTPUT_FILE 2>&1 & pid=$! &

Settings

Most of the settings can be specified in through a command line (see above). There is also a limited number of compile-time parameters (defines), namely for page walk caches, in ./clients/drcachesim/simulator/cache_simulator.cpp.