Repository: isucon/isucon11-qualify (language: go)

Issue:
[infra] bench の open 出来る fd 数を上げる
😇 

```
# ulimit -n
1024
```


Discussion / hints:
/etc/security/limits.conf

Fix patch:
diff --git a/provisioning/ansible/roles/bench/tasks/main.yml b/provisioning/ansible/roles/bench/tasks/main.yml
index ba883ae84..427a69474 100644
--- a/provisioning/ansible/roles/bench/tasks/main.yml
+++ b/provisioning/ansible/roles/bench/tasks/main.yml
@@ -4,6 +4,10 @@
   include: kernel.yml
   become_user: root
 
+- name: "roles/bench/tasks/main: Include nofile.yml"
+  include: nofile.yml
+  become_user: root
+
 - name: "roles/bench/tasks/main: Include bench.yml"
   include: bench.yml
   become_user: root
diff --git a/provisioning/ansible/roles/bench/tasks/nofile.yml b/provisioning/ansible/roles/bench/tasks/nofile.yml
new file mode 100644
index 000000000..05a433c61
--- /dev/null
+++ b/provisioning/ansible/roles/bench/tasks/nofile.yml
@@ -0,0 +1,9 @@
+---
+- name: "roles/bench/tasks/nofile: Deploy nofile.conf for FD limitation"
+  copy:
+    dest: /etc/security/limits.d/nofile.conf
+    content: |
+      root soft nofile 1048576
+      root hard nofile 1048576
+      * soft nofile 1048576
+      * hard nofile 1048576


Test patch: