[LU-10367] FIO Fails to run with libaio

• Type: Bug
• Resolution: Cannot Reproduce
• Priority: Major
• Affects Version/s: Lustre 2.10.1
• Environment: Lustre 2.10.1 RHEL 7.4
• Severity: 3
• Assignee: Andriy Skulysh
• Reporter: Keith Mannthey (Inactive)

Description

While doing some bench marking with FIO is seems libaio is not working with Lustre.

FIO can be found here: https://github.com/axboe/fio/

When running with libaio it quickly fails with error messages. A sample FIO configuration file is below:

fsync=1
directory=/mnt/lustre 
direct=1
numjobs=32
ioengine=libaio
blocksize=64k
readwrite=readwrite
size=65536m
group_reporting

Sample error messages:

.....
lustre: Laying out IO file(s) (1 file(s) / 65536MB)
fio: io_u error on file /mnt/lustre/lustre.21.0: Unknown error -131072: read offset=0, buflen=65536
fio: io_u error on file /mnt/lustre/lustre.21.0: Unknown error -131072: read offset=65536, buflen=65536
fio: pid=51260, err=-131072/file:io_u.c:1708, func=io_u error, error=Unknown error -131072
...

Removing libaio options allows FIO to run.  

Fsync and Direct really slow Lustre down but they run. 

Other tests  work as expected. 

Issue Links

• is related to: LU-11825 Remove LU-8964/pio feature & supporting framework
• is related to: LU-8964 use parallel I/O to improve performance on machines with slow single thread performance

Comments

[Aurelien Degremont (Inactive)]

The problem is still present in 2.10 LTS. The provided patch seems to fix it.

Could be interesting for 2.10.7?

[Peter Jones]

ok - thanks

[Andriy Skulysh]

The patch isn't needed after LU-11825

[James A Simmons]

Now that the PIO code has been removed is this a problem still?