[Vm-dev] Idle time and sleep/wake notification

[Ryan Macnak]

You could measure CPU time instead of wall time:
https://github.com/dart-lang/sdk/blob/master/runtime/vm/os_linux.cc#L182

On Mon, Apr 10, 2017 at 8:58 AM, Eliot Miranda <eliot.miranda at gmail.com>
wrote:

>
> Some info from an old colleague on Linux facilities:
>
> You could try the upower lib and daemon < https://upower.freedesktop.
> org/docs/ >.
>
> If that's not available or you don't fancy it and you're running systemd
> you can probably knock something up via the  systemd-suspend.service <
> https://www.freedesktop.org/software/systemd/man/systemd-
> suspend.service.html >. A bit Heath-Robinson though...
>
> Or you could configure the acpid < https://linux.die.net/man/8/acpid >to
> notify you (via a socket or somesuch...).
>
> _,,,^..^,,,_ (phone)
>
> On Mar 20, 2017, at 8:16 AM, Eliot Miranda <eliot.miranda at gmail.com>
> wrote:
>
> Hi All,
>
>     I've just added tallying of idle time in the VM so that the system
> report can give more meaningful overheads to the GC information it
> reports.  Currently the VM tallies idle time in the innards of
> relinquishProcessorForMicroseconds:.  But it also needs to tally idle
> time across SLEEP/WAKE events.  May I ask experts in the Mac OS, X11 and
> Windows worlds to have a loop at event processing and either implement
> tallying idle time here or reporting back on what work is required or (as I
> fear in the case of X11/Unix) whether it is unsupported.
>
> Here's an example of the nonsense one gets back after waking one's laptop:
> Virtual Machine Statistics
> --------------------------
> uptime 14h 59m 26s (runtime 11h 53m 33s, idletime 3h 5m 53s)
> memory 338,690,048 bytes
> old 333,689,744 bytes (98.5%)
> young 4,111,360 bytes (1.2%)
> used 314,964,392 bytes (93%)
> free 21,991,672 bytes (6.5%)
> GCs 3,430 (15733.6 ms between GCs 12482 ms runtime between GCs)
> full 8 totalling 1,331 ms (0% runtime), avg 166.4 ms
> marking 536 ms (40.3%) avg 67 ms,
> compacting 795 ms (59.7%) avg 99.4 ms
> scavenges 3,422 totalling 2,511 ms (0.01% runtime), avg 0.7 ms
> tenures 818,889 (avg 239 tenures per scavenge)
> Since last view 2,463 (21394 ms between GCs, 17285 ms runtime between GCs)
> uptime 52695.2 s, runtime 42574 s, idletime 10121.2 s
> full 2 totalling 322 ms (0% runtime), avg 161 ms
> scavenge 2,461 totalling 2,029 ms (0% runtime), avg 0.8 ms
> tenures 16,733 (avg 6 tenures per scavenge)
>
> whereas while the machine stays awake we get good information:
> Virtual Machine Statistics
> --------------------------
> uptime 1m 58s (runtime 0m 21s, idletime 1m 37s)
> memory 281,018,368 bytes
> old 276,018,064 bytes (98.2%)
> young 4,111,360 bytes (1.5%)
> used 251,951,208 bytes (89.7%)
> free 26,712,592 bytes (9.5%)
> GCs 37 (3203.5 ms between GCs 569.7 ms runtime between GCs)
> full 0 totalling 0 ms (0% runtime), avg 0 ms
> scavenges 37 totalling 13 ms (0.06% runtime), avg 0.4 ms
> tenures 648 (avg 17 tenures per scavenge)
> Since last view 30 (3498 ms between GCs, 590 ms runtime between GCs)
> uptime 104.9 s, runtime 17.7 s, idletime 87.2 s
> full 0
> scavenge 30 totalling 11 ms (0.1% runtime), avg 0.4 ms
> tenures 0
>
> _,,,^..^,,,_
> best, Eliot
>
>
>
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