Grnch Posted October 18, 2005 Report Share Posted October 18, 2005 Occasionally, uTorrent's CPU usage will shoot up to 100%, and it will stay there for a long time (1-2 minutes or more). During this time, all downloads and uploads stop, but the GUI is still responsive (I can click on menus etc). I have verified that it is uTorrent that is using the CPU by looking at Task Manager.It seems to happen quite often lately, ever since I put a few large torrents (several gigabytes) in the queue containing a bunch of RAR files, but I'm not sure this is the real cause. The queue is set to download one torrent at a time, but I have started the second torrent with "Force Start", if that means anything to you. However, the bug still happens occasionaly even with one torrent.I've been seeing this bug in all releases since 1.1.5 (maybe even 1.1.4, but not sure) with varying frequency, but it's definitely there, it happens several times per hour.Others have reported a similar bug, but it got blamed on NOD32.Well, I don't use NOD32 (never have), and Kaspersky's real-time protection was completely turned off. It makes no difference.One more thing, not sure if it might be related, I use uTorrent mostly through Remote Desktop (it's installed on a different machine). The machine itself is reasonably fast, it's an 2800+ Athlon with 1 GB of RAM.This is a serious bug, since these frequent interruptions make downloading very slow, hence rendering this program completely unusable for its main purpose, which is downloading torrents.Let me know what I can do to help you debugging this.P.S. This bug happened several times while I was writing this post. Link to comment Share on other sites More sharing options...
chaosblade Posted October 18, 2005 Report Share Posted October 18, 2005 Im assuming you messed around with the write cachedelay options. Try setting those back to the default values and try again (500kB/500ms). Link to comment Share on other sites More sharing options...
Grnch Posted October 18, 2005 Author Report Share Posted October 18, 2005 Nope, never touched them. I verified it just in case, they are at 500/500 as always. Link to comment Share on other sites More sharing options...
Dugi Posted October 18, 2005 Report Share Posted October 18, 2005 Occasionally, uTorrent's CPU usage will shoot up to 100%, and it will stay there for a long time (1-2 minutes or more).i have the same problem. i think it's appear when i try to download torrent with many seeds & peers. Link to comment Share on other sites More sharing options...
Grnch Posted October 18, 2005 Author Report Share Posted October 18, 2005 Here's a screenshot to better show you what's happening.The arrow on the left shows the CPU usage graph for utorrent.exe, you will see it has started its 100% CPU hogging a little while ago.The bottom arrow shows the trafic usage graph, you will see that the blue graph (which shows upload speed) has dropped sharply exactly at the moment when the CPU hogging started, and since the upload is stopped, after a while the download also starts to falter and drops to almost zero, if the CPU hogging continues.The top arrow shows the total CPU usage history, and you will see there have been 3 consecutive high CPU usage intervals within a relatively short period of time. All of them were caused by uTorrent. Link to comment Share on other sites More sharing options...
Grnch Posted October 18, 2005 Author Report Share Posted October 18, 2005 Also, I'm not completely certain, but I think this CPU problem starts happening more often when I "Force Start" a second large torrent, while the first is running.Dugi may be right about too many seeds & peers... Link to comment Share on other sites More sharing options...
Grnch Posted October 18, 2005 Author Report Share Posted October 18, 2005 Here's a screenshot of the Advanced Options in uTorrent.I have tried toggling the "Low CPU Mode" option on and off, it has no effect. Same for the "Slow Connect" option (but not 100% sure for this one).BTW, I'm running WinXP SP2, but with tcpip.sys patched to remove the limitation on the number of half-open connections. Link to comment Share on other sites More sharing options...
Grnch Posted October 18, 2005 Author Report Share Posted October 18, 2005 OK, I tried resetting every Advanced Option to default, except "Sparse Files", I restarted uTorrent, and I still get these high CPU usage intervals soon after I start uTorrent...I have no more ideas to try. Link to comment Share on other sites More sharing options...
Dugi Posted October 18, 2005 Report Share Posted October 18, 2005 on this torrents all it's working finebut when i try to add another torrent CPU usage increase to 100% Link to comment Share on other sites More sharing options...
eGabe Posted October 18, 2005 Report Share Posted October 18, 2005 I've seen this specifically when you're using "pre-allocate" and its doing a filecheck on multiple files. Doesn't seem to do it for me when pre-allocate is off. Link to comment Share on other sites More sharing options...
Dugi Posted October 18, 2005 Report Share Posted October 18, 2005 I've seen this specifically when you're using "pre-allocate" and its doing a filecheck on multiple files. Doesn't seem to do it for me when pre-allocate is off."pre-allocate disk space" is turned off... Link to comment Share on other sites More sharing options...
Grnch Posted October 18, 2005 Author Report Share Posted October 18, 2005 I've seen this specifically when you're using "pre-allocate" and its doing a filecheck on multiple files. Doesn't seem to do it for me when pre-allocate is off.Pre-allocate is disabled here too, so that's not it either... Link to comment Share on other sites More sharing options...
ludde Posted October 18, 2005 Report Share Posted October 18, 2005 Can someone use process explorer from www.sysinternals.comWhenever this bug happens, can you double click utorrent.exe, click on Threads, and tell me the Start address of the thread that's using all the CPU.Then if you are able to, click on the "Stack" button for that thread, and make a screenshot for me.Redo the last step a few times (and make several screenshots). Not all of them should be the same. Link to comment Share on other sites More sharing options...
Dugi Posted October 18, 2005 Report Share Posted October 18, 2005 Can someone use process explorer from www.sysinternals.comthx! great software! By using it I found a problem on my OS. it was caused by SpamPal transparent proxy. when i uninstall it everything works fine. thx again! Link to comment Share on other sites More sharing options...
Grnch Posted October 18, 2005 Author Report Share Posted October 18, 2005 Ludde, you rule!!!!Damn!I found the stupid problem, it was caused by a Layered Service Provider, installed by SpamPal's transparent proxy. I noticed a spampalLSP.dll being loaded inside utorrent.exe's address space, looks like it is loaded for every program.Apologies for ever doubting in uTorrent. Now, the question is what exactly in uTorrent is trigerring a problem inside this LSP, seeing how it works just fine with all the other programs. But I guess that's a job for SpamPal's author to figure out.Thanks again for the tip about ProcessExplorer. Link to comment Share on other sites More sharing options...
Grnch Posted October 18, 2005 Author Report Share Posted October 18, 2005 Oops, didn't refresh before posting, I missed Dugi's message... anyway, glad this problem is fixed for both of us. Link to comment Share on other sites More sharing options...
Butterfly2006 Posted August 18, 2006 Report Share Posted August 18, 2006 Now, the question is what exactly in uTorrent is trigerring a problem inside this LSP, seeing how it works just fine with all the other programs. But I guess that's a job for SpamPal's author to figure out.I just wanted to say that the lastest beta release of Spampal beta 1.73g is causing CPU problems because of Layered Service Provider installed by SpamPal's transparent proxy.HOWEVER, the lastest release of Spampal 1.594 is working great with utorrent cause it does not include this transparent proxy utility.I think it is important to say it cause I really like this two softwares and it would have been difficult to choose...Maybe it could be worth it to say this int the FAQ. Link to comment Share on other sites More sharing options...
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