Hi All:
I met a problem while testing the ramdisk peformance using fio.
The platform is arm64 , fio version is 2.1.10.
The ramdisk is enabled on my platform , so there are dev/ram0 ...to dev/ram15 totall 16 ramdisk devices.
I tried to test these ramdisks performance uisng the script file list as below.
#!/bin/bash
#disk_list=`lsscsi | awk '{print $NF}' | cut -d/ -f3`
disk_list="ram1 ram2 ram3 ram4 ram5 ram6 ram7 ram8 ram9 ram10 ram11 ram12 ram13 ram14 ram15"
numjobs=1
runtime=180
run_18disk_test()
{
logdir=/root/18disk_performance_test
rm -rf $logdir
mkdir $logdir
for rw in read write randread randwrite
do
for bs in 4K 1M
do
for iodepth in 1 2 4 8 16 32
do
for disk in `echo $disk_list`
do
iodepth_2=`printf "%02d" $iodepth`
fio --time_based --filename=/dev/$disk --rw=$rw --bs=$bs --ioengine=libaio --direct=1 --numjobs=$numjobs --iodepth=$iodepth --name=test --group_reporting --runtime=$runtime &> $logdir/${disk}_${bs}_${rw}_numjobs${numjobs}_iodepth${iodepth_2}.log &
done
sleep $runtime
done
done
done
}
But the test result is not ok.
The error log is:
test: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=1
fio-2.1.14
Starting 1 process
fio: cache invalidation of /dev/ram2 failed: Device or resource busy
fio: cache invalidation of /dev/ram2 failed: Device or resource busy
fio: cache invalidation of /dev/ram2 failed: Device or resource busy
fio: cache invalidation of /dev/ram2 failed: Device or resource busy
fio: cache invalidation of /dev/ram2 failed: Device or resource busy
fio: cache invalidation of /dev/ram2 failed: Device or resource busy
fio: cache invalidation of /dev/ram2 failed: Device or resource busy
fio: cache invalidation of /dev/ram2 failed: Device or resource busy
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