When I try to download something in my full speed (25 megabit) I get 100% peaks in CPU usage. At the same time HDD indicator is blinking like mad. Ktorrent hangs naturally, sometimes the whole system hangs. And this continues from 2 to 30 seconds. The more simultaneous downloads, the worse it gets. When uploading only everything is normal. The problem begins to show when d/l speed is roughly more then 2 Mib/s.

Tried it with ktorrent 4.0.3 and 4.0.4. No difference. System is Kubuntu 10.10 x64, KDE 4.5.3

It does not depend on the filesystem I'm using, changed the download directory from ntfs to ext4, still get the same.

Is µTP enabled ?

No.

Hello

I have the same problem.

Usually when download speeds go higher. Im on a ~100MBit line and when downloads are at 10-13 MiB/s ktorrent is extremely unresponsive, usually have to wait for 5-10 seconds before something happens in ui. And as lexxa writes, extremely high disk activity. cpu usage is around 25% at this time.

Im running ktorrent 4.0.5 archlinux
2.6.37-ARCH #1 SMP PREEMPT Tue Mar 8 08:08:06 UTC 2011 i686 Intel(R) Core(TM)2 Duo CPU E6850 @ 3.00GHz GenuineIntel GNU/Linux
7200 rpm disk.

Im using full pre allocation. utp is not enabled.

4.1 is just out, it would be interesting to know how it compares to 4.0.5 in this respect.

My guess is that the biggest cause, will probably be the SHA1 checking.

Еxact same problem

At a speed of ~90/90 MBit/s and about a 10-20 active torrents CPU usage 50-60%(1 core 100%(!), 2 - 20%). If turn off recheck chunks and utp - 30-40%. This too much. RTorrent uses 5-15%.
Memory consumption is also not small. Typically 450-650 MB. Maybe it's because of large number of torrents (~1k)?..

I like KTorrent, but his gluttony with 4.0 version makes me cry sometimes.

KTorrent 4.11, Gentoo 3.0.3, С2D E8200 @ 3.5GHz

pravda123 wrote:Еxact same problem

At a speed of ~90/90 MBit/s and about a 10-20 active torrents CPU usage 50-60%(1 core 100%(!), 2 - 20%). If turn off recheck chunks and utp - 30-40%. This too much. RTorrent uses 5-15%.
Memory consumption is also not small. Typically 450-650 MB. Maybe it's because of large number of torrents (~1k)?..

I like KTorrent, but his gluttony with 4.0 version makes me cry sometimes.

KTorrent 4.11, Gentoo 3.0.3, С2D E8200 @ 3.5GHz

I don't have that kind of connection, and usually never run 20 torrents at the same time.

It would be interesting if you could run oprofile during such a situation. It should help me pinpoint the CPU bottlenecks.

Ok, I'll try.
I would be grateful for а short manual on the proper use oprofile.
Version 0.9.6-r1 ok, or better 0.9.7?

When ktorrent running and downloading with a lot of CPU usage:

sudo opcontrol --setup --no-vmlinux
sudo opcontrol --start

Let it run for several minutes

sudo opcontrol --dump
sudo opcontrol --stop

Then:

opreport -l /usr/bin/ktorrent > ktorrent.profile
opreport -l /usr/lib/libktorrent.so > libktorrent.profile

And finally send me the two profile files or post them here as attachments.

KTorrent 4.11, Gentoo 3.0.4, С2D E8200 @ 3.56GHz
10 active torrents, 50/25 mbit/s, 20-30% of 2 core.
oprofile-0.9.7

Code: Select all

 ~ # opcontrol --setup --no-vmlinux
 ~ # opcontrol --start
Using default event: CPU_CLK_UNHALTED:100000:0:1:1
Using 2.6+ OProfile kernel interface.
Using log file /var/lib/oprofile/samples/oprofiled.log
Daemon started.
Profiler running.

I wait 2 min, and

Code: Select all

 ~ # opcontrol --dump
 ~ # opcontrol --stop
Stopping profiling.
 ~ # opreport -l /usr/bin/ktorrent > ktorrent.profile
warning: [vdso] (tgid:8021 range:0x7fffae4d4000-0x7fffae4d5000) could not be found.
 ~ # opreport -l /usr/lib/libktorrent.so > libktorrent.profile

And profile files so small. I was worried
ktorrent.profile

Code: Select all

CPU: Core 2, speed 3559.91 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 100000
samples  %        image name               symbol name
7773     70.5995  ktorrent                 /usr/bin/ktorrent
3237     29.4005  [vdso] (tgid:8021 range:0x7fffae4d4000-0x7fffae4d5000) [vdso] (tgid:8021 range:0x7fffae4d4000-0x7fffae4d5000)

libktorrent.profile

Code: Select all

CPU: Core 2, speed 3559.91 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 100000
samples  %        symbol name
368185   100.000  /usr/lib64/libktorrent.so.3.0.1

That's all

This is not very useful.

And if you let it run for longer ?

15 minutes

Code: Select all

CPU: Core 2, speed 3680.09 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 100000
samples  %        symbol name
4095074  100.000  /usr/lib64/libktorrent.so.3.0.1

Code: Select all

CPU: Core 2, speed 3680.09 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 100000
samples  %        image name               symbol name
102586   69.4924  ktorrent                 /usr/bin/ktorrent
45036    30.5076  [vdso] (tgid:27180 range:0x7fffebdff000-0x7fffebe00000) [vdso] (tgid:27180 range:0x7fffebdff000-0x7fffebe00000)

Same problem here.

Fedora 15 i686 / Ktorrent 4.1.1 (from repo)

Not sure if these are at all useful, but posting in-case they are:

Code: Select all

CPU: Core 2, speed 1596 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 100000
samples  %        image name               symbol name
32620    86.7761  [vdso] (tgid:2672 range:0x7c4000-0x7c5000) [vdso] (tgid:2672 range:0x7c4000-0x7c5000)
4971     13.2239  ktorrent                 /usr/bin/ktorrent


Code: Select all

CPU: Core 2, speed 1596 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 100000
samples  %        symbol name
1388692  100.000  /usr/lib/libktorrent.so.3.0.1


Test ran about 10 minutes. CPU usage for Ktorrent hovered around 50 - 60% most of the time in 'top'. Downloading 7 torrents, seeding 8 - but no one was downloading those during the test period. Average up / down during test was 350 KiB/s and 90 KiB/s.

I've also noticed memory usage slowly creeps up and up, required a re-start of Ktorrent every few days. At one point it was using 2.8G of my computers 4G memory and close to 95% CPU (from 'top')!

Screengrab of top showing Ktorrent using lots of memory and CPU

Any news?
Charts processor and network usage when downloading with using KTorrent.