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World Community Grid Forums
Category: Support
Forum: BOINC Agent Support
Thread: Performance Problems with HyperThreading |
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Thread Status: Active Total posts in this thread: 6
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Hi all,
I'm using SUSE 10.2 2.6.18.2-34-default P4 3.2GHz with HT and 1GB DDR-RAM BOINC 5.4.11 The Performance of my system breakes down, if BOINC calculates two WU's. If BOINC calculates one WU, there are no problems..and I don't know why. Have anybody some ideas? greetz marcel |
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
The first question is, is it trying to run 2 Help Defeat Cancer work units simultaneous? 1gb RAM is a serious stretch as each of these has a minimum ram spec of 750mb. In fact, HDC has such an impact on UD agent clients, that the minimum was upped to 1025mb (which in effect translates to machines with 1268mb ram or larger). On my HT machine, lacking control of what runs with what simultaneous, i opted to run 1 thread on BOINC with HDC, and the other with UD agent running the lighter projects. That runs great. Regrettably, thats an option limited to windows machines, thus try unticking HDC and see what happens or upgrade ram size and see.
----------------------------------------Retsof here is the HT expert, so maybe he will add more to this. cheers
WCG
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
It's very strange....
My CPU runs 2 faah work units.. If I exit the BOINC Client, the performance is slow, too. Now I think this isn't a problem with BOINC. Maybe the Kernel has a lots of problems... |
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cio_redulla
Advanced Cruncher Philippines Joined: Apr 24, 2006 Post Count: 130 Status: Offline Project Badges: 
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It's very strange.... My CPU runs 2 faah work units.. If I exit the BOINC Client, the performance is slow, too. Now I think this isn't a problem with BOINC. Maybe the Kernel has a lots of problems... Hello, Running two applications in BOINC at the same time (to take advantage of HT) is not really beneficial. Knowing that there is only one core to do the crunching, running two applications on a single core will degrade the performance of the processor even if the processor is HT capable. To be able to really run two (BOINC) applications at the same time without degrading the performance of the system, one can use (at least) a dual-core or a dual-processor machine. The WCGwiki (http://www.wcgwiki.org/en/ud/hyperthreading.cfm) explains hyper-threading quite well.  |
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
HT does perfectly fine if properly set up, without user experience degradation, and as the article says 10-20 percent can be gained. I run a P4HT 2.53ghz!
----------------------------------------On the 50/50 reporting, managed to 'merge' ** the Taskmanager reporting, on the C2D, so when a third process like UD Agent is started with a 2 thread BOINC set up like for instance, not 50,25,25 is reported, but 33,33,33. That's windows, Marcel is on Linux having the performance issue, even when BOINC has been exited. ** stumbled on a setting which had options adaptive, performance, energy efficient for the CPU. The 'performance' flipped the cycle distribution. A 'in the know' tweaker may explain this novelty to me.
WCG
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
First, thanks for all your answers...
Same problem under Windows. The CPU benchmark in AIDA rates my sytem too slow. One of the slowest machines. BIOS shows me 'sometimes' a "CPU Thermo" failure. Only sometimes :/ CPU is damaged...have to change.. My P4 2.8 runs much faster :) greetz |
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