On 05/02/2012 11:15 AM, Georg Schönberger wrote:
> Hello Everyone,
>
> is it possible to tell fio to only lay out the data files and not carry
> out any tests?
> The thing is that I need to sync my Flashcache device after laying out
> the files and before starting the read tests. Therefore it would be
> helpful if I could do the following:
> -Start fio and tell him to only lay out data files
> -Sync my cache
> -Start fio again with the previous layed out files and do the tests
That's not a bad idea. The below patch will add a create_only option. If
set, fio will exit after file creation is completed.
> Another option would be the parameter "filename", which tells fio to use
> that file. But what if I am using multiple processes, can I specify a
> file on command line for each process?
You could do that as well, but it requires you to know how fio names
its files for the jobs. Which isn't tricky, it's basically:
name.threadno.fileno
So if you have
[foo]
numjobs=4
as the first entry, you'll have foo.0.[1-4] as the file names. But the
setup only option is cleaner and then you don't have to document and
stick to the file naming :-)
diff --git a/filesetup.c b/filesetup.c
index f3d3829..a1ad026 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -665,7 +665,7 @@ int setup_files(struct thread_data *td)
dprint(FD_FILE, "setup files\n");
if (td->o.read_iolog_file)
- return 0;
+ goto done;
/*
* if ioengine defines a setup() method, it's responsible for
@@ -816,6 +816,11 @@ int setup_files(struct thread_data *td)
*/
if (!td->o.read_iolog_file)
td->total_io_size = td->o.size * td->o.loops;
+
+done:
+ if (td->o.create_only)
+ td->done = 1;
+
return 0;
err_offset:
log_err("%s: you need to specify valid offset=\n", td->o.name);
diff --git a/fio.h b/fio.h
index 6da22f0..f2a5a1f 100644
--- a/fio.h
+++ b/fio.h
@@ -125,6 +125,7 @@ struct thread_options {
unsigned int create_serialize;
unsigned int create_fsync;
unsigned int create_on_open;
+ unsigned int create_only;
unsigned int end_fsync;
unsigned int pre_read;
unsigned int sync_io;
diff --git a/options.c b/options.c
index f8927ee..28a228c 100644
--- a/options.c
+++ b/options.c
@@ -1885,6 +1885,13 @@ static struct fio_option options[FIO_MAX_OPTS] = {
.def = "0",
},
{
+ .name = "create_only",
+ .type = FIO_OPT_BOOL,
+ .off1 = td_var_offset(create_only),
+ .help = "Only perform file creation phase",
+ .def = "0",
+ },
+ {
.name = "pre_read",
.type = FIO_OPT_BOOL,
.off1 = td_var_offset(pre_read),
--
Jens Axboe
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