user/ansiterm: only write() the part of the framebuffer that changed

1 files changed, 25 insertions, 0 deletions

diff --git a/src/user/app/iostress/iostress.c b/src/user/app/iostress/iostress.c
new file mode 100644
index 0000000..843a19a
--- /dev/null
+++ b/src/user/app/iostress/iostress.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <camellia/syscalls.h>
+#include <x86intrin.h>
+
+#define NUM_RUNS 4
+#define NUM_CALLS 512
+
+int main(void) {
+	uint64_t time;
+	uint64_t results[8];
+
+	for (int i = 0; i < NUM_RUNS; i++) {
+		time = __rdtsc();
+		for (int j = 0; j < NUM_CALLS; j++)
+			_syscall_write(1, ".", 1, -1, 0);
+		_syscall_write(1, "\n", 1, -1, 0);
+		results[i] = __rdtsc() - time;
+	}
+
+	for (int i = 0; i < NUM_RUNS; i++) {
+		printf("run %x: %x\n", i, results[i] / 3000);
+	}
+
+	return 0;
+}