Message boards : Number crunching : CPU performance question!
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Guillermo Send message Joined: 4 Apr 15 Posts: 2 Credit: 822 RAC: 0 |
Hi folks! I'm new in all of distributed computing and I want your opinion about the performance of the Intel Core i7 4500 u @1.80 Ghz I guess it can be overclocked automatically @ 3,1 Ghz. Should I expect a good performance and contribution for Rosetta? |
Guillermo Send message Joined: 4 Apr 15 Posts: 2 Credit: 822 RAC: 0 |
ASAP pleease... |
dcdc Send message Joined: 3 Nov 05 Posts: 1832 Credit: 119,655,464 RAC: 11,085 |
It will do fine - it's a very efficient chip. Will be somewhere around 550 points per day per core I guess. I'm not sure what you're looking to find out? |
Sid Celery Send message Joined: 11 Feb 08 Posts: 2125 Credit: 41,245,383 RAC: 9,571 |
Hi folks! I'm under the impression the i7 is among the best platforms for running Rosetta. Is your machine a laptop or desktop? In a desktop it should overclock well and the speed increase reflect almost directly in Rosetta performance. If it's in a laptop, the amount of extra heat produced by overclocking has always scared me off the prospect of attempting it. My laptops barely seem to be able to cope with heat when running at stock. |
Chilean Send message Joined: 16 Oct 05 Posts: 711 Credit: 26,694,507 RAC: 0 |
Overclocking in general increases the performance of a CPU (I'd guess it's a linear relationship between performance and clock speed). Increasing the performance of a CPU produces faster numerical calculations thus Rosetta is able to produce faster models in your computer. So yes, overclocking your CPU will increase your contribution to Rosetta (amusing the CPU is ell refrigerated, as in, it doesn't overheat and throttle it's frequency back down). EDIT: Now, if the Rosetta code could be optimized to use AVX/AVX2, interesting things could happen performance wise! |
dcdc Send message Joined: 3 Nov 05 Posts: 1832 Credit: 119,655,464 RAC: 11,085 |
I think he's referring to the standard turbo speed of the CPU (although it's 3.0Ghz rather than 3.1Ghz according to this: http://ark.intel.com/products/75460/Intel-Core-i7-4500U-Processor-4M-Cache-up-to-3_00-GHz) I don't think it will run at that speed when all four virtual cores are running rosetta unless the cooling is very good - I might be wrong on that though. |
Chilean Send message Joined: 16 Oct 05 Posts: 711 Credit: 26,694,507 RAC: 0 |
I think he's referring to the standard turbo speed of the CPU (although it's 3.0Ghz rather than 3.1Ghz according to this: http://ark.intel.com/products/75460/Intel-Core-i7-4500U-Processor-4M-Cache-up-to-3_00-GHz) It'll probably go up to 2.8 GHz (mine says up to 3.3GHz, but that's only using 1 core out of the four). Using all 8 threads (4 cores) makes my CPU go up to 3.1 GHz. |
dcdc Send message Joined: 3 Nov 05 Posts: 1832 Credit: 119,655,464 RAC: 11,085 |
That sounds about right ;) |
sgaboinc Send message Joined: 2 Apr 14 Posts: 282 Credit: 208,966 RAC: 0 |
Hi folks! think so too, in particular the haswell platforms e.g. 4770(k), 4790(k) et.al. i'm not sure if temperature may be a little high running on stock heat sink, but i guess for desktop users, one may use an aftermarket heat sink/cpu cooler to alleviate it. according to various web sites (e.g. tomshardware, anandtech, etc) the haswell i7 is among the most energy efficient at that level of performance |
Chilean Send message Joined: 16 Oct 05 Posts: 711 Credit: 26,694,507 RAC: 0 |
Hi folks! I ran BOINC on an i5 Haswell on a LAPTOP, I was blown away at how cool it ran. The fan barely made any noise with the CPU crunching @ 100% Intel really did a great job. Imagine what comes next! |
Sid Celery Send message Joined: 11 Feb 08 Posts: 2125 Credit: 41,245,383 RAC: 9,571 |
Hi folks! I'm referring more to the L2 & L3 caches which others have reported as being highly beneficial in running Rosetta in comparison to AMDs. I'm an AMD user myself so can't confirm it directly, but I'm quite happy to accept the reports from people who use an i7 |
sgaboinc Send message Joined: 2 Apr 14 Posts: 282 Credit: 208,966 RAC: 0 |
I'm referring more to the L2 & L3 caches which others have reported as being highly beneficial in running Rosetta in comparison to AMDs. I'm an AMD user myself so can't confirm it directly, but I'm quite happy to accept the reports from people who use an i7 in terms of performance (running rosetta), apparently a certain things helped, e.g. have sufficient memory to prevent the program from hitting swap. this in a way may make linux platform more attractive as linux tend to be able to run on low memory overheads (by non boinc processes) i tend to be a fan of AMD cpu's too, however, just last year before assembling a new PC, i reviewed the various articles around the web (e.g. http://www.tomshardware.com/reviews/core-i7-4770k-haswell-review,3521-18.html) i'm attracted by the sheer power efficiency and numerical prowess of the haswell i7 cpus (https://www.pugetsystems.com/labs/articles/Haswell-Floating-Point-Performance-493/). Of course, rosetta is probably not yet using some of the specific cpu features e.g. AVX2, but nevertheless, i've seen its prowess first hand. i'm running on a i7 4771 (non-K no overclock) and it delivers some 3.8-4 Gflops per 'core' (it is 4 core x 2 hyperthreads) running rosetta clocking some 100 credits per 4 hour run per job. And for all it's worth, i normally run my cpu at 3.5 Ghz, that literally means that the processor possibly did more than a single (double precision?) floating point ops per clock. just 2 cents |
Sid Celery Send message Joined: 11 Feb 08 Posts: 2125 Credit: 41,245,383 RAC: 9,571 |
I'm referring more to the L2 & L3 caches which others have reported as being highly beneficial in running Rosetta in comparison to AMDs. I'm an AMD user myself so can't confirm it directly, but I'm quite happy to accept the reports from people who use an i7 I get all that, and agree, but it's a function of cost, as ever. Cheaper to get an 8-core AMD - especially when I got it a few years ago |
sgaboinc Send message Joined: 2 Apr 14 Posts: 282 Credit: 208,966 RAC: 0 |
this is just an interesting musing the 'average' i7 Intel Haswell desktop today does what's what was once achieved by a world fastest supercomputer 20 years ago and in only 90 watts of power http://www.top500.org/featured/top-systems/ Numerical Wind Tunnel http://www.top500.org/featured/top-systems/numerical-wind-tunnel-national-aerospace-laborator/
http://www.openblas.net/ a run from my PC
semiconductor technology has certainly come a very long way, only unfortunate thing is that we are probably near the end of moore's law i upgraded/assembled a new pc out of curiosity to know what those 'gflops' look/feel like & later decided to use the often underutilized gflops running Boinc Rosetta@home :D |
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