This patch adds a new option to fio job files. It is described
in the HOWTO as follows:
offset_increment=int If this is provided, then the real offset becomes
the offset + offset_increment * thread_number, where the
thread number is a counter that starts at 0 and is incremented
for each job. This option is useful if there are several jobs
which are intended to operate on a file in parallel in disjoint
segments, with even spacing between the starting points.
---
HOWTO | 7 +++++++
filesetup.c | 3 ++-
fio.h | 2 ++
ioengines.c | 1 +
options.c | 7 +++++++
5 files changed, 19 insertions(+), 1 deletions(-)
diff --git a/HOWTO b/HOWTO
index 0a3351c..30e4059 100644
--- a/HOWTO
+++ b/HOWTO
@@ -636,6 +636,13 @@ offset=int Start io at the given offset in the file. The data before
the given offset will not be touched. This effectively
caps the file size at real_size - offset.
+offset_increment=int If this is provided, then the real offset becomes
+ the offset + offset_increment * thread_number, where the
+ thread number is a counter that starts at 0 and is incremented
+ for each job. This option is useful if there are several jobs
+ which are intended to operate on a file in parallel in disjoint
+ segments, with even spacing between the starting points.
+
fsync=int If writing to a file, issue a sync of the dirty data
for every number of blocks given. For example, if you give
32 as a parameter, fio will sync the file for every 32
diff --git a/filesetup.c b/filesetup.c
index 446eeaf..9acce64 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -713,7 +713,8 @@ int setup_files(struct thread_data *td)
extend_size = total_size = 0;
need_extend = 0;
for_each_file(td, f, i) {
- f->file_offset = td->o.start_offset;
+ f->file_offset = td->o.start_offset +
+ td->thread_number * td->o.offset_increment;
if (!td->o.file_size_low) {
/*
diff --git a/fio.h b/fio.h
index 4afdd2d..f59265a 100644
--- a/fio.h
+++ b/fio.h
@@ -266,6 +266,8 @@ struct thread_options {
int flow_watermark;
unsigned int flow_sleep;
+ unsigned long long offset_increment;
+
unsigned int sync_file_range;
};
diff --git a/ioengines.c b/ioengines.c
index 4c609f2..1a0898d 100644
--- a/ioengines.c
+++ b/ioengines.c
@@ -278,6 +278,7 @@ int td_io_queue(struct thread_data *td, struct io_u *io_u)
*/
if (io_u->error == EINVAL && td->io_issues[io_u->ddir & 1] == 1 &&
td->o.odirect) {
+
log_info("fio: first direct IO errored. File system may not "
"support direct IO, or iomem_align= is bad.\n");
}
diff --git a/options.c b/options.c
index 463b66d..e0f6422 100644
--- a/options.c
+++ b/options.c
@@ -2216,6 +2216,13 @@ static struct fio_option options[FIO_MAX_OPTS] = {
.def = "0",
},
{
+ .name = "offset_increment",
+ .type = FIO_OPT_STR_VAL,
+ .off1 = td_var_offset(offset_increment),
+ .help = "What is the increment from one offset to the next",
+ .def = "0",
+ },
+ {
.name = NULL,
},
};
--
1.7.7.3
--
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