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Occasional drawing lags in Trunk ... VM issue?

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marcel.taeumel

Occasional drawing lags in Trunk ... VM issue?

Hi, there!

As Bert noticed a few weeks ago, fast-drag is kind of slow on MacOS.

Today, I noticed under Windows that there is an occasional, GC-like lag when resizing windows with non-fast drag.

Here is the Trunk (Cog) with noticable lag:
http://i.giphy.com/26FPJdlJcZtI6fLO0.gif

Here is 4.6 (Cog) without lag:
http://i.giphy.com/l4Ki6nefX950k0qre.gif

The drawing code in Morphic has not changed. I suspect an issue in the VM.

Best,
Marcel

Bert Freudenberg

Re: Occasional drawing lags in Trunk ... VM issue?

On 18.02.2016, at 09:02, marcel.taeumel <[hidden email]> wrote:

>
> Hi, there!
>
> As Bert noticed a few weeks ago, fast-drag is kind of slow on MacOS.
>
> Today, I noticed under Windows that there is an occasional, GC-like lag when
> resizing windows with non-fast drag.
>
> Here is the Trunk (Cog) with noticable lag:
> http://i.giphy.com/26FPJdlJcZtI6fLO0.gif
>
> Here is 4.6 (Cog) without lag:
> http://i.giphy.com/l4Ki6nefX950k0qre.gif
>
> The drawing code in Morphic has not changed. I suspect an issue in the VM.

The Mac VM switched to Cocoa so that might be slower. But Windows?!

- Bert -

smime.p7s (5K) Download Attachment

Karl Ramberg

Re: Occasional drawing lags in Trunk ... VM issue?

Wasn't there some changes to morphic/ WorldState process ? Could that cause this ?

Best,

Karl

On Thu, Feb 18, 2016 at 7:56 PM, Bert Freudenberg <[hidden email]> wrote:

On 18.02.2016, at 09:02, marcel.taeumel <[hidden email]> wrote:
>
> Hi, there!
>
> As Bert noticed a few weeks ago, fast-drag is kind of slow on MacOS.
>
> Today, I noticed under Windows that there is an occasional, GC-like lag when
> resizing windows with non-fast drag.
>
> Here is the Trunk (Cog) with noticable lag:
> http://i.giphy.com/26FPJdlJcZtI6fLO0.gif
>
> Here is 4.6 (Cog) without lag:
> http://i.giphy.com/l4Ki6nefX950k0qre.gif
>
> The drawing code in Morphic has not changed. I suspect an issue in the VM.

The Mac VM switched to Cocoa so that might be slower. But Windows?!

- Bert -

timrowledge

Re: Occasional drawing lags in Trunk ... VM issue?

In reply to this post by Bert Freudenberg

> On 18-02-2016, at 10:56 AM, Bert Freudenberg <[hidden email]> wrote:
>
> On 18.02.2016, at 09:02, marcel.taeumel <[hidden email]> wrote:
>>
>> Hi, there!
>>
>> As Bert noticed a few weeks ago, fast-drag is kind of slow on MacOS.
>>
>> Today, I noticed under Windows that there is an occasional, GC-like lag when
>> resizing windows with non-fast drag.
>>
>> Here is the Trunk (Cog) with noticable lag:
>> http://i.giphy.com/26FPJdlJcZtI6fLO0.gif
>>
>> Here is 4.6 (Cog) without lag:
>> http://i.giphy.com/l4Ki6nefX950k0qre.gif
>>
>> The drawing code in Morphic has not changed. I suspect an issue in the VM.
>
> The Mac VM switched to Cocoa so that might be slower. But Windows?!

No incremental GC in Spur yet.

tim
--
tim Rowledge; [hidden email]; http://www.rowledge.org/tim
How was Thomas J. Watson buried? 9 edge down.

Bert Freudenberg

Re: Occasional drawing lags in Trunk ... VM issue?

> On 18.02.2016, at 11:06, tim Rowledge <[hidden email]> wrote:
>
>
>> On 18-02-2016, at 10:56 AM, Bert Freudenberg <[hidden email]> wrote:
>>
>> On 18.02.2016, at 09:02, marcel.taeumel <[hidden email]> wrote:
>>>
>>> Hi, there!
>>>
>>> As Bert noticed a few weeks ago, fast-drag is kind of slow on MacOS.
>>>
>
> No incremental GC in Spur yet.

I very much doubt GC is an issue when fast-dragging (which btw feels faster in *SqueakJS* than on Mac Spur).

- Bert -

smime.p7s (5K) Download Attachment

Eliot Miranda-2

Re: Occasional drawing lags in Trunk ... VM issue?

In reply to this post by marcel.taeumel

Hi Marcel,

On Thu, Feb 18, 2016 at 9:02 AM, marcel.taeumel <[hidden email]> wrote:

Hi, there!

As Bert noticed a few weeks ago, fast-drag is kind of slow on MacOS.

Today, I noticed under Windows that there is an occasional, GC-like lag when
resizing windows with non-fast drag.

Here is the Trunk (Cog) with noticable lag:
http://i.giphy.com/26FPJdlJcZtI6fLO0.gif

Here is 4.6 (Cog) without lag:
http://i.giphy.com/l4Ki6nefX950k0qre.gif

The drawing code in Morphic has not changed. I suspect an issue in the VM.

You can get information on GC pause times by using the About Squeak inspector and looking at the information there-in. [The below isn't representative, its just what's answered soon after start-up]. Note that while the timers answered to the image are in milliseconds, the VM uses microsecond time stamps internally.

Virtual Machine Parameters

--------------------------

...

#7 0 full GCs since startup

#8 0 total milliseconds in full GCs since startup

#9 33 scavenging GCs since startup

#10 10 total milliseconds in scavenging GCs since startup

...

#38 0 milliseconds taken by current scavenge

...

#62 1 compiled code compactions since startup

#63 1 total milliseconds in compiled code compactions since startup

...

Clearly #38 isn't that useful. A "milliseconds taken by last full GC" would be more useful. I'l put it on the list.

Best,
Marcel

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best, Eliot