limit parallelism based on available memory too

.forgejo/workflows/test.yml

@@ -59,7 +59,7 @@ jobs:
           make -C sby install
       - run: |
           git clone --depth=1 --recursive --branch=0.45 https://github.com/YosysHQ/yosys.git
-          make -C yosys -j2
+          make -C yosys -j"$(nproc)"
           make -C yosys install
       - run: |
           wget -O firrtl.tar.gz https://github.com/llvm/circt/releases/download/firtool-1.86.0/firrtl-bin-linux-x64.tar.gz
@@ -70,4 +70,12 @@ jobs:
       - uses: https://github.com/Swatinem/rust-cache@v2
         with:
           save-if: ${{ github.ref == 'refs/heads/master' }}
-      - run: cargo test
+      - run: |
+          avail_mem="$(free -b | awk '/^Mem:/{print($2)}')"
+          # estimate that each test needs 16GiB
+          ((par_from_mem = avail_mem / (16 << 30)))
+          par="$(nproc)"
+          if ((par_from_mem > 0 && par > par_from_mem)); then
+              par="$par_from_mem"
+          fi
+          cargo test -- --test-threads="$par"

Cargo.lock

@@ -228,6 +228,27 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "ctor"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "edb49164822f3ee45b17acd4a208cfc1251410cf0cad9a833234c9890774dd9f"
+dependencies = [
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "derive_destructure2"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "64b697ac90ff296f0fc031ee5a61c7ac31fb9fff50e3fb32873b09223613fc0c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "digest"
 version = "0.10.7"
@@ -279,15 +300,17 @@ checksum = "e8c02a5121d4ea3eb16a80748c74f5549a5665e4c21333c6098f283870fbdea6"
 [[package]]
 name = "fayalite"
 version = "0.2.0"
-source = "git+https://git.libre-chip.org/libre-chip/fayalite.git?branch=master#3d0f95cfe5a910f79177babf8fe12483f83e96f9"
+source = "git+https://git.libre-chip.org/libre-chip/fayalite.git?branch=master#cb17913004259b6e0908a477a67e5a6b621b5c1c"
 dependencies = [
  "bitvec",
  "blake3",
  "clap",
+ "ctor",
  "eyre",
  "fayalite-proc-macros",
  "fayalite-visit-gen",
  "hashbrown 0.14.5",
+ "jobslot",
  "num-bigint",
  "num-traits",
  "os_pipe",
@@ -300,7 +323,7 @@ dependencies = [
 [[package]]
 name = "fayalite-proc-macros"
 version = "0.2.0"
-source = "git+https://git.libre-chip.org/libre-chip/fayalite.git?branch=master#3d0f95cfe5a910f79177babf8fe12483f83e96f9"
+source = "git+https://git.libre-chip.org/libre-chip/fayalite.git?branch=master#cb17913004259b6e0908a477a67e5a6b621b5c1c"
 dependencies = [
  "fayalite-proc-macros-impl",
 ]
@@ -308,7 +331,7 @@ dependencies = [
 [[package]]
 name = "fayalite-proc-macros-impl"
 version = "0.2.0"
-source = "git+https://git.libre-chip.org/libre-chip/fayalite.git?branch=master#3d0f95cfe5a910f79177babf8fe12483f83e96f9"
+source = "git+https://git.libre-chip.org/libre-chip/fayalite.git?branch=master#cb17913004259b6e0908a477a67e5a6b621b5c1c"
 dependencies = [
  "base16ct",
  "num-bigint",
@@ -323,7 +346,7 @@ dependencies = [
 [[package]]
 name = "fayalite-visit-gen"
 version = "0.2.0"
-source = "git+https://git.libre-chip.org/libre-chip/fayalite.git?branch=master#3d0f95cfe5a910f79177babf8fe12483f83e96f9"
+source = "git+https://git.libre-chip.org/libre-chip/fayalite.git?branch=master#cb17913004259b6e0908a477a67e5a6b621b5c1c"
 dependencies = [
  "indexmap",
  "prettyplease",
@@ -351,6 +374,17 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4567c8db10ae91089c99af84c68c38da3ec2f087c3f82960bcdbf3656b6f4d7"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.14.5"
@@ -411,6 +445,20 @@ version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
 
+[[package]]
+name = "jobslot"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe10868679d7a24c2c67d862d0e64a342ce9aef7cdde9ce8019bd35d353d458d"
+dependencies = [
+ "cfg-if",
+ "derive_destructure2",
+ "getrandom",
+ "libc",
+ "scopeguard",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.159"
@@ -526,6 +574,12 @@ version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f3cb5ba0dc43242ce17de99c180e96db90b235b8a9fdc9543c96d2209116bd9f"
 
+[[package]]
+name = "scopeguard"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
+
 [[package]]
 name = "serde"
 version = "1.0.210"
@@ -656,6 +710,12 @@ version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
 
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
 [[package]]
 name = "which"
 version = "6.0.3"