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[BUG-202882] Sudden 3-5 seconds drop in "%scripts run" with avatar freeze when avatar arrives/logs in in nearby regions #3159

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sl-service-account opened this issue Jan 7, 2018 · 5 comments

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@sl-service-account
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sl-service-account commented Jan 7, 2018

Steps to Reproduce

This can be reproduced with any viewer, by any avatar. All you need to do is stand still and wait until a child avatar is created.

Actual Behavior

This issue can reliably be reproduced in the region The Farthest Shore. Over the last half year we have treated this as a region performance issue with numerous logged support calls. We have done extensive tuning of the sim. The number of scripts in the sim has been cut by 2/3, textures have been converted to lowest useful resolution. Temp-rezzers have been removed. We have even tried moving the sim to Blue Steel (it was on main channel).

Lately we became aware that the spikes we saw were related to avatars logging in or arriving in nearby sims (child avatars). Whenever that happens, the sim goes into a 3-5 second "freeze". Support has asked me to report this as a bug.

This is a sim with competitions. It is highly dependent on good performance. The lag spikes ruin the competitions. It seems that an avatar arriving in a surrounding sim draws an unreasonable amount of resources from the sim during the 3-5 first seconds.

Expected Behavior

I was expecting that the sim would keep performing normally when avatars arrive in surrounding sims.

Other information

This is a very frustrating issue, one that ruins the sim's use for competitions.

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Original Jira Fields
Field Value
Issue BUG-202882
Summary Sudden 3-5 seconds drop in "%scripts run" with avatar freeze when avatar arrives/logs in in nearby regions
Type Bug
Priority Unset
Status Accepted
Resolution Accepted
Reporter Serjourn Daxter (serjourn.daxter)
Created at 2018-01-07T16:30:06Z
Updated at 2019-02-16T20:34:47Z
{
  'Business Unit': ['Platform'],
  'Date of First Response': '2018-01-07T21:22:47.163-0600',
  "Is there anything you'd like to add?": "This is a very frustrating issue, one that ruins the sim's use for competitions.",
  'ReOpened Count': 0.0,
  'Severity': 'Unset',
  'System': 'SL Simulator',
  'Target Viewer Version': 'viewer-development',
  'What just happened?': 'This issue can reliably be reproduced in the region The Farthest Shore. Over the last half year we have treated this as a region performance issue with numerous logged support calls. We have done extensive tuning of the sim. The number of scripts in the sim has been cut by 2/3, textures have been converted to lowest useful resolution. Temp-rezzers have been removed. We have even tried moving the sim to Blue Steel (it was on main channel).\r\n\r\nLately we became aware that the spikes we saw were related to avatars logging in or arriving in nearby sims (child avatars). Whenever that happens, the sim goes into a 3-5 second "freeze". Support has asked me to report this as a bug.\r\n\r\nThis is a sim with competitions. It is highly dependent on good performance. The lag spikes ruin the competitions. It seems that an avatar arriving in a surrounding sim draws an unreasonable amount of resources from the sim during the 3-5 first seconds. ',
  'What were you doing when it happened?': 'This can be reproduced with any viewer, by any avatar. All you need to do is stand still and wait until a child avatar is created.',
  'What were you expecting to happen instead?': 'I was expecting that the sim would keep performing normally when avatars arrive in surrounding sims.',
  'Where': 'The Farthest Shore sim, anywhere in the sim, http://maps.secondlife.com/secondlife/The%20Farthest%20Shore/128/128/25',
}
@sl-service-account
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Whirly Fizzle commented at 2018-01-08T03:22:47Z

I wonder if this is a case of BUG-8946?

@sl-service-account
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Serjourn Daxter commented at 2018-01-09T18:31:38Z

It looks much so, however, over the last 6-7 months, the issue has become substantially worse. We know there is a drop when avatars arrive in the sim, but this drop happens also when avatars arrive in neighbouring sims. The issue is a showstopper for certain competitions that require smooth script flow. It is like driving your car down the road - then applying the brakes for full for 5 seconds, then speeding on again. NOT a comfortable ride at all!

@sl-service-account
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Serjourn Daxter commented at 2018-01-09T21:38:33Z

There seem to be little difference in the lag space between avatars arriving directly in the sim and avatars arriving in neighbour sims. This contradicts the idea of child avatars as they should only introduce a minor load outside the sim where they rez. It seems like something is very wrong here in the logic.

@sl-service-account
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Serjourn Daxter commented at 2018-01-09T21:40:32Z

Oh I just remembered - we "boxed in" the sim some weeks ago, creating huge walls that surrounded the entire sim and were opaque. We expected some performance improvements, but saw none. Another indication of some program logic error perhaps?

@sl-service-account
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Serjourn Daxter commented at 2018-04-05T20:13:28Z

After this weeks rolling restarts, the problem has become much worse. Something in the update made the situation a lot worse. PLEASE FIND AND SQUASH THIS BUG!

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