I was only kidding anyway. I included it as another target :-)
On Tue, Mar 29, 2016 at 2:48 PM Dan Cross <[email protected]> wrote: > Don't include that part, then; the rdtsc and rdtscp changes are what you > want. > > On Tue, Mar 29, 2016 at 5:46 PM, ron minnich <[email protected]> wrote: > >> but this was not what we want :-) >> >> x86_64-ucb-akaros-gcc -Ofast -mfxsr -mxsave -mxsaveopt -o fputest >> fputest.c >> >> On Tue, Mar 29, 2016 at 2:42 PM Dan Cross <[email protected]> wrote: >> >>> FYI, please see attached patch. >>> >>> On Mon, Mar 28, 2016 at 6:32 PM, ron minnich <[email protected]> wrote: >>> >>>> The timing is per-operation, not per total run. Even if we get one >>>> timer interrupt in there, it's going to be one bad data point. I'm fine >>>> with that. >>>> >>>> But, me, i'm only taking 128 samples. I think that's more the enough >>>> and it runs in maybe several dozen microseconds. >>>> >>>> ron >>>> >>>> On Mon, Mar 28, 2016 at 3:29 PM ron minnich <[email protected]> wrote: >>>> >>>>> I'm still testing on linux. Akaros comes later :-) >>>>> >>>>> On Mon, Mar 28, 2016 at 2:59 PM Barret Rhoden <[email protected]> >>>>> wrote: >>>>> >>>>>> On 2016-03-28 at 21:46 ron minnich <[email protected]> wrote: >>>>>> > https://github.com/akaros/fputest >>>>>> > >>>>>> > >>>>>> > We're getting there. It's now using gcc intrinsics, which hopefully >>>>>> > are more correct. Still trying to get sane timing for the "no op" >>>>>> > case. >>>>>> >>>>>> i'd be concerned if the intrinsics are right and our own versions are >>>>>> wrong. hopefully that won't be the case after this gets sorted out. >>>>>> >>>>>> >>>>>> given that n = 1000000 and rdtsc alone takes O(30) ticks, you're >>>>>> probably getting interference from the timer IRQ, even on Akaros Core >>>>>> 0. >>>>>> here's two quick things to try: >>>>>> >>>>>> call uthread_mcp_init() somewhere in main. that'll make you an MCP. >>>>>> it's a bit hacky. verify that it's working with a ps or pip. >>>>>> >>>>>> check your tsc overhead against __procinfo.timing_overhead or against >>>>>> the console output during boot, e.g. >>>>>> >>>>>> TSC overhead (Min: 32, Max: 36) >>>>>> >>>>>> i didn't look at any of the actual FPU stuff for issues yet. >>>>>> >>>>>> barret >>>>>> >>>>>> -- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "Akaros" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to [email protected]. >>>>>> To post to this group, send email to [email protected]. >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Akaros" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To post to this group, send email to [email protected]. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Akaros" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "Akaros" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to the Google Groups > "Akaros" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Akaros" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. For more options, visit https://groups.google.com/d/optout.
