Print s2disk benchmarks. The image writeout time is saved in the
swsusp_info header during suspend, then statistics are printed during
resume about elapsed time and image load/store speed for writeout,
readin, and total.
---
resume.c | 24 +++++++++++++++++++++++-
suspend.c | 11 +++++++++++
2 files changed, 34 insertions(+), 1 deletion(-)
Index: suspend-0.2/suspend.c
===================================================================
--- suspend-0.2.orig/suspend.c
+++ suspend-0.2/suspend.c
@@ -16,6 +16,8 @@
#include <sys/mount.h>
#include <sys/vt.h>
#include <sys/wait.h>
+#include <sys/time.h>
+#include <time.h>
#include <linux/kd.h>
#include <linux/tiocl.h>
#include <syscall.h>
@@ -492,6 +494,7 @@
struct swsusp_info *header = mem_pool;
loff_t start;
int error;
+ struct timeval begin;
printf("suspend: System snapshot ready. Preparing to write\n");
start = get_swap_page(snapshot_fd);
@@ -544,6 +547,7 @@
}
}
#endif
+ gettimeofday(&begin, NULL);
error = save_image(&handle, header->pages - 1);
}
if (!error) {
@@ -551,6 +555,13 @@
if (compute_checksum)
md5_finish_ctx(&handle.ctx, header->checksum);
}
+ fsync(resume_fd);
+ if (!error) {
+ struct timeval end;
+ gettimeofday(&end, NULL);
+ timersub(&end, &begin, &end);
+ header->writeout_time = end.tv_usec / 1000000.0 + end.tv_sec;
+ }
if (!error)
error = write_area(resume_fd, header, start, page_size);
if (!error) {
Index: suspend-0.2/resume.c
===================================================================
--- suspend-0.2.orig/resume.c
+++ suspend-0.2/resume.c
@@ -15,6 +15,8 @@
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
+#include <sys/time.h>
+#include <time.h>
#include <syscall.h>
#include <fcntl.h>
#include <unistd.h>
@@ -512,8 +514,28 @@
if (ret < (int)page_size)
error = ret < 0 ? ret : -EIO;
}
- if (!error)
+ if (!error) {
+ struct timeval begin, end;
+ double delta, mb = header->size / (1024.0 * 1024.0);
+
+ gettimeofday(&begin, NULL);
error = load_image(&handle, dev, nr_pages);
+ gettimeofday(&end, NULL);
+
+ timersub(&end, &begin, &end);
+ delta = end.tv_usec / 1000000.0 + end.tv_sec;
+
+ printf("wrote %0.1lf MB in %0.1lf seconds (%0.1lf
MB/s)\n",
+ mb, header->writeout_time, mb /
header->writeout_time);
+
+ printf("read %0.1lf MB in %0.1lf seconds (%0.1lf
MB/s)\n",
+ mb, delta, mb / delta);
+
+ mb *= 2.0;
+ delta += header->writeout_time;
+ printf("total image i/o %0.1lf MB in %0.1lf seconds
(%0.1lf MB/s)\n",
+ mb, delta, mb / delta);
+ }
}
if (error) {
printf("\nresume: The system snapshot image could not be
read.\n\n"
-------------------------------------------------------------------------
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