Hello,
I have an application that uses AIO+DIO to write data to a file on XFS.
The writes use 128k buffers. Very rarely, I see aligned 4k blocks within
the file that are zeroed. The blocks are not aligned to 128k boundary,
just 4k. The buffers are allocated in anonymous memory, which is usually
using transparent hugepages. The files are fully allocated, not sparse
(checked post-mortem).
The writes are concurrent and adjacent. To avoid serialization, we
ftruncate() the file to a larger size, then ftruncate() it back when we
know its final size.
Does this trigger anything in anyone's mind?
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