[Android] Pieces checking slow with POSIX I/O backend

[proninyaroslav]

Version: 2.0.5-26-RC1

Pieces checking hangs at some point, if POSIX I/O backend is enabled. I opened the log and found that there is a check running before 100-200 pieces, after which the check hangs. This happens with large torrents:

• if the torrent has many files (more than 100)
• if the size of the parts is large (about 15 MB)
• or if there is only one file, but its size is large enough, more than 10 GB

This doesn't happen if the mmap I/O backend is enabled.

[proninyaroslav]

UPD: I checked it again and It looks like the the check progress doesn't hangs completely, but it's very slow compared to mmap. I took ~14GB torrent with 258 files for test and noted the time:

POSIX	mmap
2 min 33 sec	1 min 13 sec

[aldenml]

is this a 64bits device?

[proninyaroslav]

Yes, but I can try to check it on a 32-bit device.

[aldenml]

Hi @proninyaroslav, is this still a problem?

[proninyaroslav]

@aldenml Yes