jiigen666/libtorrent
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

slight performance fix in disk elevator algorithm

Browse Source
This commit is contained in:
Arvid Norberg
2010-04-24 21:53:45 +00:00
parent 54c451e513
commit fb28835452
3 changed files with 62 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
src/disk_io_thread.cpp
View File

@@ -1467,6 +1467,8 @@ namespace libtorrent
typedef std::multimap<size_type, disk_io_job> read_jobs_t;
read_jobs_t sorted_read_jobs;
read_jobs_t::iterator elevator_job_pos = sorted_read_jobs.begin();
size_type last_elevator_pos = 0;
bool need_update_elevator_pos = false;
for (;;)
{
@@ -1565,11 +1567,8 @@ namespace libtorrent
m_log << log_time() << " sorting_job" << std::endl;
#endif
size_type phys_off = j.storage->physical_offset(j.piece, j.offset);
bool update_pos = sorted_read_jobs.empty();
need_update_elevator_pos = need_update_elevator_pos || sorted_read_jobs.empty();
sorted_read_jobs.insert(std::pair<size_type, disk_io_job>(phys_off, j));
// if sorted_read_jobs used to be empty,
// we need to update the elevator position
if (update_pos) elevator_job_pos = sorted_read_jobs.begin();
continue;
}
}
@@ -1582,6 +1581,14 @@ namespace libtorrent
TORRENT_ASSERT(!sorted_read_jobs.empty());
// if sorted_read_jobs used to be empty,
// we need to update the elevator position
if (need_update_elevator_pos)
{
elevator_job_pos = sorted_read_jobs.lower_bound(last_elevator_pos);
need_update_elevator_pos = false;
}
// if we've reached the end, change the elevator direction
if (elevator_job_pos == sorted_read_jobs.end() && elevator_direction == 1)
{
@@ -1605,6 +1612,7 @@ namespace libtorrent
else --elevator_job_pos;
TORRENT_ASSERT(to_erase != elevator_job_pos);
last_elevator_pos = to_erase->first;
sorted_read_jobs.erase(to_erase);
}