最初のコミット

hoge.sh

@@ -0,0 +1,32 @@
+cat >hoge.cpp <<EOF
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <cstdint>
+int main() {
+    int f = open("hoge.txt", O_CREAT|O_SYNC|O_RDWR, 0644);
+    uint8_t data[4096] = {0};
+    while(true) {
+        write(f, data, 4096);
+        lseek(f, 0, SEEK_SET);
+    }
+    close(f);
+    return 0;
+}
+EOF
+g++ -g hoge.cpp -o hoge
+for pcount in $(seq 0 $(nproc --all)); do
+    echo "[dummy process count: $pcount]"
+    /usr/bin/time ./hoge&
+    pid_time=$!
+    pid_dummy=''
+    for i in $(seq $pcount); do
+        sh -c 'while :;do :;done'&
+        pid_dummy="$pid_dummy $!"
+    done
+    vmstat 1 10
+    pid_hoge=$(ps -o pid= --ppid $pid_time)
+    kill $pid_hoge $pid_dummy
+    wait
+done