ok. that makes sense. i thought that the file fio created was already written with verify data. thanks a lot On Tue, Aug 21, 2018 at 11:19 PM, Jens Axboe <axboe@xxxxxxxxx> wrote: > On 8/21/18 4:21 AM, Chao Guo wrote: >> 1) A description of what you think the bug is: >> >> when using readwrite=randread and do_verify=1, fio always fails with >> 'Invalid or incomplete multibyte or wide character' >> >> >> 2) Environment (Linux distro version, kernel version). This is mostly >> needed if it's a build bug. >> >> CentOS 7(fio 3.1-2) >> >> CentOS 7(build from github.com/axboe/fio, master) >> >> Ubuntu 18.04(fio 3.1-1) >> >> 3) The output from fio --version. >> >> See above >> >> 4) How to reproduce. Please include a full list of the parameters >> passed to fio and the job file used (if any). >> >> [global] >> ioengine=libaio >> direct=1 >> group_reporting >> iodepth=128 >> bs=1M >> readwrite=randread >> size=500MB >> do_verify=1 >> verify=crc32c-intel >> >> [test] >> filename=test > > You're asking fio to verify a file, which assumes that the file > has already been written with verify data. That's not the case > (unless you ran another job to do that first), so the verify will > naturally fail. > > Change your readwrite=randread to readwrite=randwrite, and fio > will randomly write it first, them randomly read and verify. > > -- > Jens Axboe > -- 关注官微，获实时帮助 郭超 Guo Chao 上海亦存网络科技有限公司 Yicun Network Tech Co., Ltd. 邮箱 Email: guochao@xxxxxxxxxxxx 手机 Mobile: 18729085840
