./build-modules --gcc-which host --host+
./build-modules --host
./build-modules --gcc-which host --host+
./build-modules --host
./build-modules --gcc-which host --host -- hello hello2+
./build-modules --host -- hello hello2
From the message, this appears however to be a Python / pyenv11 bug however and not in gem5 specifically. I think it worked when I tried it in the past in an older gem5 / Ubuntu.
--without-tcmalloc is needed / a good idea when using --with-asan: https://stackoverflow.com/questions/42712555/address-sanitizer-fsanitize-address-works-with-tcmalloc since both do more or less similar jobs, see also Memory leaks.
TODO: analyze better what each of the memory event mean. For now, we have just collected a bunch of data there, but needs interpreting. The CPU specifics in this section are already insightful however.
+TimingSimpleCPU should be the second simplest CPU to analyze, so let’s give it a try:
Also mentioned at: https://stackoverflow.com/questions/47320800/how-to-clean-only-target-in-buildroot
See this for a sample manual workaround: Section 21.8.2.4, “PARSEC uninstall”.
+See this for a sample manual workaround: Section 21.8.3.4, “PARSEC uninstall”.
git submodule update --init submodules/dhrystone -./build-dhrystone --mode userland +./build-dhrystone --optimization-level 3 ./run --userland "$(./getvar userland_build_dir)/submodules/dhrystone/dhrystone"
TODO automate run more nicely to dispense getvar.
Increase the number of loops to try and reach more meaningful results:
+./run --userland "$(./getvar userland_build_dir)/submodules/dhrystone/dhrystone" --userland-args 100000000+
Build and run on gem5 user mode:
./build-dhrystone --mode userland --static --force-rebuild -./run --emulator gem5 --userland "$(./getvar userland_build_dir)/submodules/dhrystone/dhrystone"+
./build-dhrystone --optimization-level 3 --static +./run --emulator gem5 --userland "$(./getvar --static userland_build_dir)/submodules/dhrystone/dhrystone"
TODO automate run more nicely.
+Run natively on the host:
+./build-dhrystone --host +"$(./getvar --host userland_build_dir)/submodules/dhrystone/dhrystone"+
Build for Baremetal execution and run it in baremetal QEMU:
+Build for Baremetal execution and run it in baremetal QEMU. TODO: fix the build, just need to factor out all run arguments from build-baremetal into common.py and it should just work, no missing syscalls.
TODO: fix the build, just need to factor out all run arguments from build-baremetal into common.py and it should just work, no missing syscalls.
-If you really want the Buildroot package for some reason, build it with:
Very simple memory width benchmark with one C and one Fortran version, originally published in 1991, and the latest version at the time of writing is from 2013.
+Its operation is very simple: fork one thread for each CPU in the system (using OpenMP) and do the following four array operations (4 separate loops of individual operations):
+/* Copy. */ +times[0 * ntimes + k] = mysecond(); +#pragma omp parallel for +for (j=0; j<stream_array_size; j++) + c[j] = a[j]; +times[0 * ntimes + k] = mysecond() - times[0 * ntimes + k]; + +/* Scale. */ +times[1 * ntimes + k] = mysecond(); +#pragma omp parallel for +for (j=0; j<stream_array_size; j++) + b[j] = scalar*c[j]; +times[1 * ntimes + k] = mysecond() - times[1 * ntimes + k]; + +/* Add. */ +times[2 * ntimes + k] = mysecond(); +#pragma omp parallel for +for (j=0; j<stream_array_size; j++) + c[j] = a[j]+b[j]; +times[2 * ntimes + k] = mysecond() - times[2 * ntimes + k]; + +/* Triad. */ +times[3 * ntimes + k] = mysecond(); +#pragma omp parallel for +for (j=0; j<stream_array_size; j++) + a[j] = b[j]+scalar*c[j]; +times[3 * ntimes + k] = mysecond() - times[3 * ntimes + k]; +}+
The LKMC usage of STREAM is analogous to that of Dhrystone. Build and run on QEMU User mode simulation:
+git submodule update --init submodules/stream-benchmark +./build-stream --optimization-level 3 +./run --userland "$(./getvar userland_build_dir)/submodules/stream-benchmark/stream_c.exe"+
Decrease the benchmark size and the retry count to finish simulation faster, but possibly have a less representative result:
+./run --userland "$(./getvar userland_build_dir)/submodules/stream-benchmark/stream_c.exe" --userland-args '100 2'+
Build and run on gem5 user mode:
+./build-stream --optimization-level 3 --static +./run --emulator gem5 --userland "$(./getvar --static userland_build_dir)/submodules/stream-benchmark/stream_c.exe" --userland-args '1000 2'+
We have ported parts of the PARSEC benchmark for cross compilation at: https://github.com/cirosantilli/parsec-benchmark See the documentation on that repo to find out which benchmarks have been ported. Some of the benchmarks were are segfaulting, they are documented in that repo.
./build --arch arm --download-dependencies gem5-buildroot parsec-benchmark @@ -23775,7 +23870,7 @@ cblas_dgemm( CblasColMajor, CblasNoTrans, CblasTrans,3,3,2 ,1, A,3, B,
Running a benchmark of a size different than test, e.g. simsmall, requires a rebuild with:
Most users won’t want to use this method because:
If you want to remove PARSEC later, Buildroot doesn’t provide an automated package removal mechanism as mentioned at: Section 20.6, “Remove Buildroot packages”, but the following procedure should be satisfactory:
If you end up going inside submodules/parsec-benchmark to hack up the benchmark (you will!), these tips will be helpful.