diff --git a/benchmark/0002.file_io_tsc/1mtime/fstream.cc b/benchmark/0002.file_io_tsc/1mtime/fstream.cc
new file mode 100644
index 000000000..d4cc279ec
--- /dev/null
+++ b/benchmark/0002.file_io_tsc/1mtime/fstream.cc
@@ -0,0 +1,28 @@
+#include <fast_io.h>
+#include <fast_io_device.h>
+#include <fast_io_legacy.h>
+#include <fast_io_driver/timer.h>
+#include <vector>
+
+int main()
+{
+    constexpr std::size_t N(1000000);
+    {
+        fast_io::timer t(u8"output");
+        fast_io::filebuf_file obf(u8"fstream.txt", fast_io::open_mode::out);
+        std::ostream fout(obf.fb);
+        for (std::size_t i{}; i != N; ++i)
+        {
+            fout << i;
+            obf.fb->sputc('\n');
+        }
+    }
+    std::vector<std::size_t> vec(N);
+    {
+        fast_io::timer t(u8"input");
+        fast_io::filebuf_file ibf(u8"fstream.txt", fast_io::open_mode::in);
+        std::istream fin(ibf.fb);
+        for (std::size_t i{}; i != N; ++i)
+            fin >> vec[i];
+    }
+}
diff --git a/benchmark/0002.file_io_tsc/1mtime/iobuf_file.cc b/benchmark/0002.file_io_tsc/1mtime/iobuf_file.cc
new file mode 100644
index 000000000..6fb202eb9
--- /dev/null
+++ b/benchmark/0002.file_io_tsc/1mtime/iobuf_file.cc
@@ -0,0 +1,23 @@
+#include <fast_io.h>
+#include <fast_io_device.h>
+#include <fast_io_driver/timer.h>
+#include <vector>
+using namespace fast_io::io;
+
+int main()
+{
+    constexpr std::size_t N(1000000);
+    {
+        fast_io::timer t(u8"output");
+        fast_io::obuf_file obf("iobuf_file.txt");
+        for (std::size_t i{}; i != N; ++i)
+            println(obf, i);
+    }
+    std::vector<std::size_t> vec(N);
+    {
+        fast_io::timer t(u8"input");
+        fast_io::ibuf_file ibf("iobuf_file.txt");
+        for (std::size_t i{}; i != N; ++i)
+            scan(ibf, vec[i]);
+    }
+}
diff --git a/benchmark/0002.file_io_tsc/1mtime/stdio.cc b/benchmark/0002.file_io_tsc/1mtime/stdio.cc
new file mode 100644
index 000000000..81dfdb971
--- /dev/null
+++ b/benchmark/0002.file_io_tsc/1mtime/stdio.cc
@@ -0,0 +1,22 @@
+#include <fast_io.h>
+#include <fast_io_device.h>
+#include <fast_io_driver/timer.h>
+#include <vector>
+
+int main()
+{
+    constexpr std::size_t N(1000000);
+    {
+        fast_io::timer t(u8"output");
+        fast_io::c_file obf(u8"stdio.txt", fast_io::open_mode::out);
+        for (std::size_t i{}; i != N; ++i)
+            fprintf(obf.fp, "%zu\n", i);
+    }
+    std::vector<std::size_t> vec(N);
+    {
+        fast_io::timer t(u8"input");
+        fast_io::c_file ibf(u8"stdio.txt", fast_io::open_mode::in);
+        for (std::size_t i{}; i != N; ++i)
+            fscanf(ibf.fp, "%zu", vec.data() + i);
+    }
+}
\ No newline at end of file