restrict concurrency to 32.

Author: liuliu

.github/workflows/coverage.yaml

@@ -8,7 +8,7 @@ jobs:
       - name: configure & build
         run: |
           cd lib && ./configure --enable-sm80 && cd ..
-          make -j 64 -C test COVER=1 all.tests
+          make -j 32 -C test COVER=1 all.tests
       - name: tests
         run: |
           make -C test check

.github/workflows/cuda-int-tests.yaml

@@ -8,7 +8,7 @@ jobs:
       - name: configure & build
         run: |
           cd lib && ./configure --enable-sm80 && cd ..
-          make -j 64 -C test/int/nnc
+          make -j 32 -C test/int/nnc
       - name: integration tests
         run: |
           make -C test/int/nnc test

.github/workflows/ubsan-unit-tests.yaml

@@ -8,11 +8,11 @@ jobs:
       - name: configure & build
         run: |
           cd lib && ./configure --enable-sm80 && cd ..
-          make -j 64 -C lib ubsan
-          make -j 64 -C bin ubsan
-          make -j 64 -C bin/nnc ubsan
-          make -j 64 -C bin/cuda ubsan
-          make -j 64 -C test ubsan
+          make -j 32 -C lib ubsan
+          make -j 32 -C bin ubsan
+          make -j 32 -C bin/nnc ubsan
+          make -j 32 -C bin/cuda ubsan
+          make -j 32 -C test ubsan
       - name: tests
         run: |
           make -C test test