The fastest thing you can do is make a dedicated partition and read and
write it directly. This is very simple (open(), read(), write(),
seek(), etc). I typically dedicate the first 1024 blocks to storing
info about the files. I use one block per file and the first block
stores info about the number of files stored. Something like this:
block0000[0]=10 //10 files
block0001[0]=1024; //file 1 starts at block 1024
block0001[1]=1001023; //file 1 ends at block 1001023 (for a total of 512
megabytes as each block is 512 bytes)
.....
block0010[0]=xxx //file 10 starts at block xxx
block0010[1]=xxx //file 10 ends at block xxx
This gives you a very fast simple sequential file system.
If you only need to use one file you could dd it to the partition. In
your code use open() to open the partition and read() the data. If you
want to test to see if a dedicated raw partition is going to be fast
enough you can use dd with /dev/zero or /dev/null to test sequentially
read and write speed. You can vary the read/write size in dd to figure
out the optimal read or write size.
-Jim
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