| --- Log opened Thu Jul 18 00:00:13 2013 | ||
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| munaafghumran | Am I in charge of creating the training set for the ML (or a small set thats big enough to test out a few different methods). On that topic, the training set could help to have associated power consumption for each set of flags that programs are run on, so there's a measure of what helped reduce power. | 10:01 |
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| munaafghumran | I wanted to try to recreate the approach MILEPOST used, just on a small scale to get the method right even if for now I just use it for execution time | 10:02 |
| jamespallister | If you want some initial data, I can collect some energy data for you | 10:31 |
| @jeremybennett_ | munaafghumran: You should draw on jamespallister expertise. | 10:32 |
| @jeremybennett_ | We are going to need training sets and evaluation sets, the latter could include bigger programs. | 10:32 |
| @jeremybennett_ | jamespallister started with 10 programs, but he had another 10 under consideration. | 10:33 |
| @jeremybennett_ | We do need to explicitly package these up. | 10:33 |
| @jeremybennett_ | We can discuss this when we meet on Monday | 10:33 |
| @jeremybennett_ | jamespallister: How's the jetlag? | 10:34 |
| jamespallister | jeremybennett_: redbull helps, but I'm mostly back on UK time, if a bit tired | 10:34 |
| @jeremybennett_ | Nothing liek | 10:34 |
| @jeremybennett_ | Nothing like a 6am start to shock you back into local time :( | 10:35 |
| jamespallister | Are you up at the TSB? | 10:35 |
| @jeremybennett_ | Yup - sitting next to your supervisor | 10:35 |
| jamespallister | Ah well in that case I am working very hard | 10:35 |
| @jeremybennett_ | I've already briefed her on your hard work in California :) | 10:36 |
| munaafghumran | jamespallister: I think the energy data would be good, though I thought AWhetter was getting this information from the boards simon gave him from benchmark programs? | 10:55 |
| jamespallister | I don't think we have the boards up and running yet? | 10:56 |
| AWhetter | nope | 10:56 |
| AWhetter | nearly but not yet | 10:56 |
| jamespallister | If you need something to experiment with immediately, I've should be able to generate some data | 10:56 |
| munaafghumran | oh right okay, if you can give me a few programs energy data and the associated files so I can generate the feature vectors from milepost then I can start trying some stuff out | 10:57 |
| jamespallister | Which flags, and how many data points do you need? | 11:01 |
| munaafghumran | standard ones with -O3 for reference, and just some rnadomly switched ones for now (just for some data as we are goign to use bluecrystal to do it with 1000 random flags I presumed?) | 11:05 |
| jamespallister | well we can't use bluecrystal to generate the energy data. I guess we can use it if the training takes a significant amount of time | 11:06 |
| jamespallister | there are ~82 flags enabled for O3, in GCC 4.7 | 11:07 |
| munaafghumran | okay, right well then for now could I get some data with just -O3, and then if you can run it with 70 iterations on flags randomly set on and off and collect that data for 4 or 5 programs if that's not too much hassle? | 11:11 |
| jamespallister | by just -O3, do you mean the 9 flags enabled on top of O0? | 11:14 |
| jamespallister | i.e. O1 enables 37 flags over O0, O2 enables 37 more (36+37 total flags) | 11:15 |
| jamespallister | O3 enables 9 further flags (37+36+9 = 82) | 11:15 |
| munaafghumran | oh right I meant just so it's run with -O3, like gcc -O3 hello.c so if that enables 82 flags in total, then with those 82 | 11:16 |
| munaafghumran | those 82 turned on* | 11:17 |
| munaafghumran | if you can save the random set of on/off flags (or I can provide some if that's easier) along with the energy output for each run with those flags, that's what I am looking for | 11:18 |
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| jamespallister | munaafghumran: just generating the file now | 13:33 |
| munaafghumran | cheers! | 13:34 |
| jamespallister | takes about 2-3 hours per benchmark | 13:34 |
| jamespallister | how were you planning on extracting the features from the benchmarks? | 13:34 |
| jamespallister | using milepost? | 13:34 |
| munaafghumran | yeah | 13:34 |
| jamespallister | ah | 13:35 |
| munaafghumran | that's fine I can get them all once it's all done | 13:35 |
| munaafghumran | is that a problem using milepost? | 13:35 |
| jamespallister | I'm just thinking that the features may not be correct - these benchmarks were compiled with GCC 4.7 | 13:35 |
| munaafghumran | if it's the benchmark programs you have given ashley, I have the feature files from him already - the low-powerbenchmarks on git? | 13:36 |
| jamespallister | yes | 13:36 |
| munaafghumran | hmm why would it not be correct sorry? | 13:36 |
| jamespallister | I'm guessing you were planning on running the benchmarks through milepost with the same compiler options, and extracting them during the compilation process | 13:36 |
| jamespallister | unless there is a method that can extract the features from a compiled binary | 13:37 |
| munaafghumran | milepost can just extract the features given just the .c file so I was going to just run that extract_features option | 13:37 |
| munaafghumran | but like I said if the benchmarks are the one you have given ashley, I have the feature vectors from them as ashleys already run milepost on all of them | 13:39 |
| jamespallister | ah ok yes that should be good enough | 13:39 |
| jamespallister | it may be slightly inaccurate due to parsing difference between different compiler versions | 13:39 |
| jamespallister | but should be good enough for a first attempt | 13:40 |
| munaafghumran | I think that'll be fine as yeah exactly it's just a first attempt for now, just need rough numbers and correct data to work with :) | 13:40 |
| jamespallister | ok cool, how many data points do you need per benchmark? | 13:40 |
| munaafghumran | what do you mean by data points exactly | 13:41 |
| jamespallister | iterations - each data point is one set of flags with the corresponding energy value | 13:41 |
| jamespallister | im currently doing 1000 tests per benchmark, each test has a different set of flags | 13:41 |
| jamespallister | but if less are required, I can get you the data faster | 13:42 |
| munaafghumran | oh right, yeah, I think for now, 500 might be enough to get something going | 13:42 |
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| --- Log closed Fri Jul 19 00:00:19 2013 | ||
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