Residency profiles

[Simon Marlow]

https://phabricator.haskell.org/D5428


On Sun, 9 Dec 2018 at 10:12, Sebastian Graf <sgraf1337 at gmail.com> wrote:

> Ah, I was only looking at `+RTS --help`, not the users guide. Silly me.
>
> Am Do., 6. Dez. 2018 um 20:53 Uhr schrieb Simon Marlow <marlowsd at gmail.com
> >:
>
>> It is documented!
>> https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/runtime_control.html#rts-flag--F%20%E2%9F%A8factor%E2%9F%A9
>>
>> On Thu, 6 Dec 2018 at 16:21, Sebastian Graf <sgraf1337 at gmail.com> wrote:
>>
>>> Hey,
>>>
>>> thanks, all! Measuring with `-A1M -F1` delivers much more reliable
>>> residency numbers.
>>> `-F` doesn't seem to be documented. From reading `rts/RtsFlags.c` and
>>> `rts/sm/GC.c` I gather that it's the factor by which to multiply the number
>>> of live bytes by to get the new old gen size?
>>> So effectively, the old gen will 'overflow' on every minor GC, neat!
>>>
>>> Greetings
>>> Sebastian
>>>
>>> Am Do., 6. Dez. 2018 um 12:52 Uhr schrieb Simon Peyton Jones via
>>> ghc-devs <ghc-devs at haskell.org>:
>>>
>>>> |  Right. A parameter for fixing the nursery size would be easy to
>>>> implement,
>>>> |  I think. Just a new flag, then in GC.c:resize_nursery() use the flag
>>>> as the
>>>> |  nursery size.
>>>>
>>>> Super!  That would be v useful.
>>>>
>>>> |  "Max. residency" is really hard to measure (need to do very frequent
>>>> GCs),
>>>> |  perhaps a better question to ask is "residency when the program is
>>>> in state
>>>> |  S".
>>>>
>>>> Actually, Sebastian simply wants to see an accurate, reproducible
>>>> residency profile, and doing frequent GCs might well be an acceptable
>>>> cost.
>>>>
>>>> Simon
>>>> _______________________________________________
>>>> ghc-devs mailing list
>>>> ghc-devs at haskell.org
>>>> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
>>>>
>>>
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