Add memtest workloads for an ioengine using mmap to run within
the memory mapped region (not to/from another transfer buffer in
regular memory). Useful for persistent memory testing.
Tests include:
memcpy = copy with libc memcpy() (d = s)(one read, one write)
memscan = read memory to registers (one read)
memset = write memory from registers with libc memset() (one write)
wmemset = write memory from registers with libc wmemset() (one write)
streamcopy = STREAM copy (d = s)(one read, one write)
streamadd = STREAM add (d = s1 + s2)(two reads, add, one write)
streamscale = STREAM scale (d = 3 * s1)(one read, multiply, one write)
streamtriad = STREAM triad (d = s1 + 3 * s2)(two reads, add and
multiply, one write)
Open issues:
* make memscan architecture-independent (or make the test unavailable
in non-x86). The initial generic memcsum attempt still results in the
compiler generating memory writes.
* ensure fio is not allocating/filling unused xfer_buf
* ensure Read and Write statistics make sense for each memtest (e.g.
streamadd should count 2x reads and 1x writes)
* make use_glibc_nt functional (needs to be earlier, may not even
be possible)
* combine map_populate, glibc_nt, etc. to avoid creating too many
top-level fio options
* add to dev-dax and libpmem ioengines
Robert Elliott (3):
memcpytest: Add more sizes
memcpytest: add more memcpy tests
ioengines: add memtest workloads for ioengines using mmap
HOWTO | 37 +++++
debug.h | 1 +
engines/dev-dax.c | 12 +-
engines/libpmem.c | 18 +--
engines/mmap.c | 142 +++++++++++++++++--
fio.1 | 37 +++++
init.c | 4 +
io_ddir.h | 27 +++-
io_u.c | 3 +-
io_u.h | 9 +-
lib/memcpy.c | 411 ++++++++++++++++++++++++++++++++++++++++++++++++------
lib/memcpy.h | 4 +
options.c | 91 ++++++++++++
thread_options.h | 7 +
14 files changed, 733 insertions(+), 70 deletions(-)
--
2.14.3
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