test definition help needed

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I am trying to create a job file that randomly select a file form an imported list and reads the entire file sequentially. Them moves to the next file. I also want multiple jobs(processe) running the same workload. I have this:

[global]
bs=4k
time_based=1
runtime=15m
iodepth=4
rw=read
ioengine=libaio
time_based=1
ramp_time=600s
norandommap

[job1]
opendir=/${FIO_MOUNT}/session1/small_file1
file_service_type=sequential
numjobs=8



I used file_service_type=sequential because tought without it it would only do a single read (block) from the file before switching to a different file, which is not what I want. The issue with this test as written is it seems like all the fio processes choose files in the same order so I get way more cache hits than I want. I want this to be more of a random file selection, but with reading whole file.  Any advice?

Steve
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