DMP-VA-FS Tutorial

Environment

• Linux
• GEM5 build env

Artifacts

• FS mode required binaries AArch64
  • Linux Kernel with Bootloader
  • Linux Disk Images
• executable workload, instrumented with gem5ops (eg. spmv_csr.elf)
  • serial sourcecode in serial_workload
• test scripts (eg. spmv_csr.rcS)

Configuration

• unzip aarch-system-20220707.tar.bz2
  • path to vmlinux.arm64 as kernel_path
  • path to boot.arm64 as bootloader_path
• unzip ubuntu-18.04-arm-docker.img.bz2
  • path to this img as disk_path

Mount disk img as loop dev.

# losetup -P /dev/loopX disk_path
# mount /dev/loopXpY disk_mount_point_as_you_like

Copy workload into it.

# cp workload disk_mount_point_as_you_like/your_workload_path/

Example:

# cp spmv_csr.elf as-caida_csr.mtx disk_mount_point_as_you_like/spmv/

Configurate rcS with your workload path. Example spmv_csr.rcS

#!/bin/sh

echo "SpMV Computing!"
cd /spmv
./spmv_csr.elf false ./as-caida_csr.mtx
echo "SpMV Done."

/sbin/m5 exit

Run

• Compile GEM5 with scons:

$ scons build/ARM/gem5.opt -j(nproc)

• run gem5. Example:

$ build/ARM/gem5.opt \
    configs/dmp_pf/fs_L2.py \
    --num-cpus 1 \
    --cpu-clock 2.5GHz \
    --cpu-type O3_ARM_v7a_3 \
    --caches --l2cache \
    --l1i_assoc 8 --l1d_assoc 8 --l2_assoc 4 \
    --l2_mshr_num 32 \
    --l2_repl_policy LRURP \
    --l2-hwp-type DiffMatchingPrefetcher \
    --dmp-init-bench spmv \
    --dmp-notify l1 \
    --mem-type SimpleMemory --mem-size 8GB \
    --kernel=kernel_path \
    --bootloader=bootloader_path \
    --disk-image=disk_path \
    --script=spmv_csr.rcS \

Additional Options

Name	Description	Example
--dmp-init-bench	benchmark name for PC hint when auto-detection is disable	spmv
--dmp-notify	access cache level which trigger DMP	l1
--tlb-size	DTLB size	65536
--stride-degree	degree for StridePrefetcher	4
--dmp-range-ahead-dist	prefetch ahead number of continuous target pc address	0
--dmp-indir-range	prefetch generating number from continuous index pc offset	16

Checkpoints

You can utilize checkpoint mechanism to speedup simulation. Keep --tlb-size consistent between cpt dumping and cpt restoring.