Hi, I am trying to use the splice ioengine to read/write from/to tmpfs (/dev/shm). Writing works fine e.g. with the following fio config: [sw] rw=write size=1g directory=/dev/shm iodepth=32 direct=0 blocksize=512k numjobs=1 nrfiles=1 ioengine=splice loops=1 group_reporting create_on_open=1 create_serialize=0 But reading the same file afterwards with the splice ioengine fails: [sw] rw=read size=1g directory=/dev/shm iodepth=32 direct=0 blocksize=512k numjobs=1 nrfiles=1 ioengine=splice loops=1 group_reporting root@server1:~/fio# ./fio /root/fior_splice.fio sw: (g=0): rw=read, bs=512K-512K/512K-512K, ioengine=splice, iodepth=32 fio 1.53 Starting 1 process fio: pid=17504, err=22/file:filesetup.c:502, func=open(/dev/shm/sw.1.0), error=Invalid argument Run status group 0 (all jobs): Is something misconfigured in the fio read config? The --debug=all output is: Starting 1 process file 17517 setup files file 17517 get file size for 0x7f2f87451028/0/0x7f2f87451108 diskutil 17517 /dev/shm/sw.1.0 belongs to maj/min 0/17 process 17517 pid=0: runstate 0 -> 1 process 17517 will fork mutex 17517 wait on startup_mutex process 17519 jobs pid=17519 started process 17519 pid=17519: runstate 1 -> 2 mutex 17519 up startup_mutex mutex 17519 wait on td->mutex mutex 17517 done waiting on startup_mutex process 17517 pid=17519: runstate 2 -> 4 mutex 17519 done waiting on td->mutex mem 17519 Alloc 16777216 for buffers [...] file 17519 trying file /dev/shm/sw.1.0 10 file 17519 fd open /dev/shm/sw.1.0 file 17519 file not found in hash /dev/shm/sw.1.0 file 17519 get file /dev/shm/sw.1.0, ref=0 io 17519 invalidate cache /dev/shm/sw.1.0: 0/1073741824 file 17519 fd close /dev/shm/sw.1.0 file 17519 error 1 on open of /dev/shm/sw.1.0 file 17519 get_next_file_rr: (nil) fio: pid=17519, got signal=11 process 17517 pid=17519: runstate 4 -> 9 process 17517 terminate group_id=-1 process 17517 setting terminate on sw/17519 diskutil 17517 update io ticks Other fio ioengines (sync, vsync) work fine for both reading/writing on tmpfs. Also, other splice tests can do both reads and writes to tmpfs (e.g. splice-cp). This happens with current fio-master or fio-1.38-1 (debian package) thanks for any comments, - Vasilis -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
