diff --git a/README.adoc b/README.adoc index d213fd9..ba385d9 100644 --- a/README.adoc +++ b/README.adoc @@ -13445,7 +13445,7 @@ cat /proc/sys/vm/overcommit_memory which is documented in `man proc`. -The default value is `0`, which I can't find a precise documentation for. `2` is precisly documented but I'm lazy to do all calculations. So let's just verify `0` vs `1` by trying to `mmap` 1GiB of memory: +The default value is `0`, which I can't find a precise documentation for. `2` is precisely documented but I'm lazy to do all calculations. So let's just verify `0` vs `1` by trying to `mmap` 1GiB of memory: .... echo 0 > /proc/sys/vm/overcommit_memory @@ -18628,10 +18628,10 @@ For example, the simplest scalable CPU content would be a busy loop: link:userla Summary of manually collected results on <> at LKMC a18f28e263c91362519ef550150b5c9d75fa3679 + 1: xref:table-busy-loop-dmips[xrefstyle=full]. As expected, the less native / more detailed / more complex simulations are slower! [[table-busy-loop-dmips]] -.Busy loop DMIPS for different simulator setups +.Busy loop MIPS for different simulator setups [options="header"] |=== -|Simulator |Loops |Time (s) |Instruction count| Approximate MIPS +|Simulator |Loops |Time (s) |Instruction count |Approximate MIPS |`qemu --arch aarch64` |10^10 @@ -18657,15 +18657,21 @@ Summary of manually collected results on <> at LKMC a18f28e263c91362519ef55 |1.1018128 * 10^7 |0.2 +|`+gem5 --arch aarch64 --gem5-build-id MOESI_CMP_directory -- --cpu-type DerivO3CPU --caches --ruby+` +|1 * 1000000 = 10^6 +|63 +|1.1005150 * 10^7 +|0.2 + |=== The first step is to determine a number of loops that will run long enough to have meaningful results, but not too long that we will get bored. -On our <> machine, we found 10^7 (10 million == 1000 times 10000) loops to be a good number: +On our <> machine, we found 10^7 (10 million == 1000 times 10000) loops to be a good number for a gem5 atomic simulation: .... -./run --arch aarch64 --emulator gem5 --userland userland/gcc/busy_loop.c --userland-args '1000 10000' --static -./get-stat sim_insts +./run --arch aarch64 --emulator gem5 --userland userland/gcc/busy_loop.c --userland-args '1 10000000' --static +./gem5-stat --arch aarch64 sim_insts .... as it gives: