From 4b96cc9bcda26f853c047d5c89e5d8dd2b766d25 Mon Sep 17 00:00:00 2001
From: first_user <first_user@elephantcat.work>
Date: Thu, 15 Feb 2024 19:39:05 +0900
Subject: [PATCH] =?UTF-8?q?=E6=9C=80=E5=88=9D=E3=81=AE=E3=82=B3=E3=83=9F?=
 =?UTF-8?q?=E3=83=83=E3=83=88?=
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---
 hoge.sh | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 hoge.sh

diff --git a/hoge.sh b/hoge.sh
new file mode 100644
index 0000000..9127cdd
--- /dev/null
+++ b/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