Seeding is being stalled while files are being checked

[zetok]

The issue was also reproducible on version 3.1.12.

qBittorrent: 3.2.5
Qt: 5.4.2
libtorrent: 1.0.7.0
boost: 1.56.0
OS version: Gentoo x86_64

Reproducible: Always

Steps to reproduce:
There are torrents located on 2 HDDs, /h1 and /h2.

1. Torrents on /h1 are being seeded with speed ~300 KB/s.
2. When files of torrent on /h2 are being checked, global seeding speed of all torrents, also the ones located on /h1 goes down to 1-2 KB/s.

Seeding speed goes back to ~300KB/s once files are checked.

It seems that this issue was also mentioned in #2602:

In addition, it greatly slows down my download speed on other files.

since the other issue is about checking speed itself, and this remark seems to have been ~forgotten, I've opened this issue.

[chrishirst]

libtorrent is single threaded and as a forced recheck is a high priority task, ALL other processing ceases until the check is complete.

This also applies to moving payloads between filing systems or drive letters on Windows.

[FranciscoPombal]

Closing as far too old, there have been many improvements to libtorrent since then, this is most likely fixed.