Re: Maximum number of files we can read/write with FIO

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On 7/25/23 09:47, stelios evagorou wrote:
Hello,

I was trying to create a job file that has the following form:

[global]
blocksize=4k
ioengine=libaio
readwrite=randwrite
size=20G
name=test
numjobs=32
group_reporting=1
file_service_type=random
iodepth=128
fallocate=native
runtime=120
directory=/tmp/ssfs/home/sevag/fuse_ext4
[jobs1]
filename:f1:f2:f3......f8192


but when i tried to run it i got the error message "value exceeds max length of 4096 fio". Is there anyway to achieve the above setting?

Many thanks,
Stelios Evagorou

The error occurs because the maximum possible length for the value for the filename option is set to 4096.

Instead of filename=... try the following:

nrfiles=8192
filename_format=f$filenum

The files will be named f0, f1, ..., f8191.

Vincent



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