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gem5: bring fast build back to life and benchmark it on busy loop

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Ciro Santilli 六四事件 法轮功
2020-01-22 00:00:00 +00:00
parent 0d5a41a3f8
commit 0bc76fc582
2 changed files with 47 additions and 14 deletions
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56
README.adoc
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@@ -12155,6 +12155,18 @@ In order to use different build options, you might also want to use <<gem5-build
Explained at: xref:debug-the-emulator[xrefstyle=full].
==== gem5 fast build
....
./build-gem5 --gem5-build-type fast
....
How it goes faster is explained at: https://stackoverflow.com/questions/59860091/how-to-increase-the-simulation-speed-of-a-gem5-run/59861375#59861375
Benchmarks present at:
* xref:benchmark-emulators-on-userland-executables[xrefstyle=full]
==== gem5 clang build
TODO test properly, benchmark vs GCC.
@@ -19747,7 +19759,7 @@ Summary of manually collected results on <<p51>> at LKMC a18f28e263c91362519ef55
|QEMU busy loop
|a18f28e263c91362519ef550150b5c9d75fa3679 + 1
|link:userland/gcc/busy_loop.c[] `-O0`
|`qemu --arch aarch64 --userland userland/gcc/busy_loop.c `
|`./run --arch aarch64 --userland userland/gcc/busy_loop.c `
|10^10
|68
|1.1 * 10^11 (approx)
@@ -19756,25 +19768,43 @@ Summary of manually collected results on <<p51>> at LKMC a18f28e263c91362519ef55
|gem5 busy loop
|a18f28e263c91362519ef550150b5c9d75fa3679 + 1
|link:userland/gcc/busy_loop.c[] `-O0`
|`gem5 --arch aarch64 --userland userland/gcc/busy_loop.c`
|10^7
|100
|1.10018162 * 10^8
|1
|`./run --arch aarch64 --emulator gem5 --static --userland userland/gcc/busy_loop.c --userland-args 1000000`
|10^6
|18
|2.4005699 * 10^7
|1.3
|gem5 busy loop for a debug build
|a18f28e263c91362519ef550150b5c9d75fa3679 + 1
|link:userland/gcc/busy_loop.c[] `-O0`
|`gem5 --arch aarch64 --gem5-build-id debug --userland userland/gcc/busy_loop.c --userland-args 100000`
|`./run --arch aarch64 --emulator gem5 --gem5-build-type debug --static --userland userland/gcc/busy_loop.c --userland-args 100000`
|10^5
|32
|2.528728 * 10^6
|0.08
|33
|2.405682 * 10^6
|0.07
|gem5 busy loop for a fast build
|0d5a41a3f88fcd7ed40fc19474fe5aed0463663f + 1
|link:userland/gcc/busy_loop.c[] `-O0 -static`
|`./run --arch aarch64 --emulator gem5 --gem5-build-type fast --static --userland userland/gcc/busy_loop.c --userland-args 1000000`
|10^6
|15
|2.4005699 * 10^7
|1.6
|gem5 busy loop for a <<gem5-cpu-types,TimingSimpleCPU>>
|a18f28e263c91362519ef550150b5c9d75fa3679 + 1
|link:userland/gcc/busy_loop.c[] `-O0`
|`+./run --arch aarch64 --emulator gem5 --arch aarch64 --static --userland userland/gcc/busy_loop.c --userland-args 1000000 -- --cpu-type TimingSimpleCPU --caches+`
|10^6
|26
|2.4005699 * 10^7
|0.9
|gem5 busy loop for a <<gem5-cpu-types,MinorCPU>>
|a18f28e263c91362519ef550150b5c9d75fa3679 + 1
|link:userland/gcc/busy_loop.c[] `-O0`
|`+gem5 --arch aarch64 --userland userland/gcc/busy_loop.c --userland-args 1000000 -- --cpu-type MinorCPU --caches+`
|`+./run --arch aarch64 --emulator gem5 --arch aarch64 --userland userland/gcc/busy_loop.c --userland-args 1000000 -- --cpu-type MinorCPU --caches+`
|10^6
|31
|1.1018152 * 10^7
@@ -19783,7 +19813,7 @@ Summary of manually collected results on <<p51>> at LKMC a18f28e263c91362519ef55
|gem5 busy loop for a <<gem5-cpu-types,DerivO3CPU>>
|a18f28e263c91362519ef550150b5c9d75fa3679 + 1
|link:userland/gcc/busy_loop.c[] `-O0`
|`+gem5 --arch aarch64 --userland userland/gcc/busy_loop.c --userland args 1000000 -- --cpu-type DerivO3CPU --caches+`
|`+./run --arch aarch64 --emulator gem5 --userland userland/gcc/busy_loop.c --userland args 1000000 -- --cpu-type DerivO3CPU --caches+`
|10^6
|52
|1.1018128 * 10^7
@@ -19792,7 +19822,7 @@ Summary of manually collected results on <<p51>> at LKMC a18f28e263c91362519ef55
|
|a18f28e263c91362519ef550150b5c9d75fa3679 + 1
|link:userland/gcc/busy_loop.c[] `-O0`
|`+gem5 --arch aarch64 --gem5-build-id MOESI_CMP_directory -- --cpu-type DerivO3CPU --caches --ruby+`
|`+./run --arch aarch64 --emulator gem5 --gem5-build-id MOESI_CMP_directory -- --cpu-type DerivO3CPU --caches --ruby+`
|1 * 1000000 = 10^6
|63
|1.1005150 * 10^7

5
common.py
View File

@@ -150,6 +150,9 @@ consts['build_type_choices'] = [
# -O0 -g
'debug'
]
consts['gem5_build_type_choices'] = consts['build_type_choices'] + [
'fast',
]
consts['build_type_default'] = 'opt'
# Files whose basename start with this are gitignored.
consts['tmp_prefix'] = 'tmp.'
@@ -333,7 +336,7 @@ Default: {}
)
self.add_argument(
'--gem5-build-type',
choices=consts['build_type_choices'],
choices=consts['gem5_build_type_choices'],
default=consts['build_type_default'],
help='gem5 build type, most often used for "debug" builds.'
)