Hi there, I send this again, I'm not sure if it was sent last time, I
thought I was subscribed to the mailing list but I wasn't.
I'm trying to run some benchmarks using the ioegnines libaio and
pvsync2. I'm trying to run sequential reads/writes and random
read/writes in a file of 200G with a maximum of 4 jobs, that is,
threads. I don't mix them, that is, I run sequentially or randomly
reads/writes.
My question is this: when running sequentially, given that I'm using 4
threads, is it really sequential?. Do the threads interfere with each
other?, if yes, which options should I use to make each thread only
issue requests to disjoint parts of the file, each of 50G (in case of 4
threads). I tried using offset_increment, but sometimes it overflows on
random requests, and for sequential requests the file size increases
automatically, that is, the requests are going further the size of the
file, but it does not crashes. More specifically, I get the file size in
bytes, exactly 214748364800. I divide that number in the number of
threads, and I use the result as the offset_increment. The file is
created using the filecreate engine with size 200G.
Lastly, is it possible for each thread to issue random requests only in
that piece of 50G, so that it does not overflows to other threads piece
of file or even overflow outside the file?.
Perhaps I'm doing something wrong. Could someone please help me?.
Thank you.
Hamilton.
