For example in uTorrent, these are two (or 3) different options (diskio.sparse_files vs. I dont think this is correct logic on their part. So I was partially right in all my rambling, the default of 1 means "Sparse" is mixed into being called a preallocation scheme. The 0,1,2 numbers translate into these flags ( libtransmission/transmission.h#L62) :Ġ = TR_PREALLOCATE_NONE, 1 = TR_PREALLOCATE_SPARSE, 2 = TR_PREALLOCATE_FULLĮXT4 supports Sparse files and this is the fastest way to write and not fully pre-allocate (brute-force write zeros) or compact-allocate (by bittorrent piece). Yea, I think thats is a good way to put it. Maybe the fastest test-case is to try to make an XFS partition and test that. Without having experience in this program, I can't speak further to all it's inner-complexities, but maybe someone else can.Īlso in this file is code for XFS. The combination of those, and the syscalls used is what affects it. Line 503 lists some flags that are used: TR_SYS_FILE_APPEND, TR_SYS_FILE_TRUNCATE, TR_SYS_FILE_SEQUENTIAL. Also ftruncate() is used to punch holes in allocations.
Looks like it does use fallocate64() when it detects it can, like on EXT4, or could fall back to the slower posix_fallocate(). Im not sure if there is anything you can do or if i got that analysis correct either.
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Perhaps ext4 compounds this by using the fallocate() kernel syscall internally, and its spending its cpu time deciding how to not fragment. Wild guess, It sounds lile the process of selecting specific files causes the disk allocation to be laid out internally in a gapped way that matches the skipped files BT piece number, so it doesnt just make individual files, it makes one sparse block per torrent, with skipped gaps.
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Preallocation: (0 = Off, 1 = Fast, 2 = Full (slower but reduces disk fragmentation), default = 1)
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