Add pre_read option
With this option set, files will be pre-read into memory before
starting the given IO operation(s).
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/filesetup.c b/filesetup.c
index 04d7b98..2858018 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -119,6 +119,39 @@
return 1;
}
+static int pre_read_file(struct thread_data *td, struct fio_file *f)
+{
+ int r;
+ unsigned long long left;
+ unsigned int bs;
+ char *b;
+
+ bs = td->o.max_bs[DDIR_READ];
+ b = malloc(bs);
+ memset(b, 0, bs);
+
+ lseek(f->fd, f->file_offset, SEEK_SET);
+ left = f->io_size;
+
+ while (left && !td->terminate) {
+ if (bs > left)
+ bs = left;
+
+ r = read(f->fd, b, bs);
+
+ if (r == (int) bs) {
+ left -= bs;
+ continue;
+ } else {
+ td_verror(td, EIO, "pre_read");
+ break;
+ }
+ }
+
+ free(b);
+ return 0;
+}
+
static unsigned long long get_rand_file_size(struct thread_data *td)
{
unsigned long long ret, sized;
@@ -572,6 +605,20 @@
return 1;
}
+int pre_read_files(struct thread_data *td)
+{
+ struct fio_file *f;
+ unsigned int i;
+
+ dprint(FD_FILE, "pre_read files\n");
+
+ for_each_file(td, f, i) {
+ pre_read_file(td, f);
+ }
+
+ return 1;
+}
+
int init_random_map(struct thread_data *td)
{
unsigned long long blocks, num_maps;