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8th BOINC Pentathlon - May 5th - 19th 2017 - Page 16

post #151 of 1349
Quote:
Originally Posted by mmonnin View Post

No idea if its faster to run many single tasks or one big one.
Not "one big" one, but limiting resources to 50% of threads so that it would never have more than one job per physical CPU core. I've run into many cases where, lacking I/O bounds, parallel jobs run the same or faster overall with 18 parallel processes as they do with 36.

It depends wildly on the nature of the job, I/O, cache-invalidation, synchronization, etc...

So, this isn't a question of "one vs many" but 18 vs 36 (physical cores vs HyperThreads), for this particular job?
post #152 of 1349
That'll depend on the CPU type and what is shared between threads on the same CPU core.. Can always try with HT on and off. I wouldn't trust an OS to evenly distribute threads evenly at 50%.
post #153 of 1349
Quote:
Originally Posted by mmonnin View Post

That'll depend on the CPU type and what is shared between threads on the same CPU core.. Can always try with HT on and off. I wouldn't trust an OS to evenly distribute threads evenly at 50%.
My observations and measurements in other such work seem to show that the linux kernel has a pretty good handle on spreading work correctly on HT intel processors.

Same goes for windows on Intel CPUs.

Fair point though that the only way to be sure is disable HT, but rebooting computers is something windows people do. biggrin.gif
post #154 of 1349
Thread Starter 
Quote:
Originally Posted by cekim View Post
 
Quote:
Originally Posted by mmonnin View Post

That'll depend on the CPU type and what is shared between threads on the same CPU core.. Can always try with HT on and off. I wouldn't trust an OS to evenly distribute threads evenly at 50%.
My observations and measurements in other such work seem to show that the linux kernel has a pretty good handle on spreading work correctly on HT intel processors.

Same goes for windows on Intel CPUs.

Fair point though that the only way to be sure is disable HT, but rebooting computers is something windows people do. biggrin.gif

 

The majority of BOINC projects have single threaded CPU tasks.  The only projects that have multi-threaded tasks are MilkyWay@Home, YAFU, and the projects that use a Virtual Box wrapper (Cosmology@Home and LHC@Home).  I haven't tested the efficiency of the multi-threaded tasks, and the VBox tasks add a whole other layer of complexity.  There is a high probability that HT off is actually more efficient on the VBox tasks.  I generally use KVM or ESXi for virtualization, so I'm not sure how the current VBox client handles HT.  There is probably some info on the LHC@Home forums, but I haven't had a chance to dig into it. 

 

There used to be a hit with HT enabled on a number of the "regular" (no muti-threaded tasks) projects, but I believe that all projects are now equally or more efficient with HT enabled.  

post #155 of 1349
Yafu also has several multi threaded non-vbox apps. I had just ran a couple units to get WUProp hours in April.
post #156 of 1349
Thread Starter 

Forgot about YAFU (thanks and edited). :D  There might actually be some other mt apps, but it has been awhile since I checked.

post #157 of 1349
how do i find my cross project ID?
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post #158 of 1349
Thread Starter 
Quote:
Originally Posted by ihatelolcats View Post

how do i find my cross project ID?

 

If you click on your BOINC postbit, it's at the top of your BOINC Stats page.

post #159 of 1349
Quote:
Originally Posted by tictoc View Post

Quote:
Originally Posted by ihatelolcats View Post

how do i find my cross project ID?

If you click on your BOINC postbit, it's at the top of your BOINC Stats page.

oh yeah. sweet, signed up. oddly the cosmology task i got isn't using any cpu power... planck_param_sims 2.04 (vbox64_mt)
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post #160 of 1349
Thread Starter 
Quote:
Originally Posted by ihatelolcats View Post
 
Quote:
Originally Posted by tictoc View Post
 
Quote:
Originally Posted by ihatelolcats View Post

how do i find my cross project ID?

If you click on your BOINC postbit, it's at the top of your BOINC Stats page.

oh yeah. sweet, signed up. oddly the cosmology task i got isn't using any cpu power... planck_param_sims 2.04 (vbox64_mt)

For the vbox tasks (planck and boinc2docker) you need to have Virtual Box installed and enable AMD-V in the BIOS, since it actually runs in a Virtual Box wrapper.

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