Dan Le wrote:
Greetings,
FIO needs to write data files in order to read them. Without disabling
the write-cache of the disk, I was wondering if there's a way to flush
these data cache to disk right before FIO starts to read these files.
Fio does an fsync and an FADVISE_DONT_NEED call after file creation
phase which causes the cache to be dropped. I have never had a problem
with files still being in cache when a read test starts. The only one
to watch out for is if you repeat the test, the files may be in cache
from a previous read, as the default behavior is to not delete on
completion and to not re-create if they already exist.
Steve
I don't want to run every second "sync && echo 3 >
/proc/sys/vm/drop_caches" at the same time with FIO because of its
incurred overhead. Please help.
Thank you,
Dan
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