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

[Eliot Miranda]

Hi Ryan,

On Mon, Apr 10, 2017 at 7:16 PM, Ryan Macnak <rmacnak at gmail.com> wrote:

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

Yes, a better addition than idle time, I agree.


> 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-sus
>> pend.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
>>
>>
>>
>
>


-- 
_,,,^..^,,,_
best, Eliot
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