[#SVC-4616] sim stalls when people who are a bit prim and/or script heavy TP in (or log in or fly in, etc)

2. Second Life Service - SVC

sim stalls when people who are a bit prim and/or script heavy TP in (or log in or fly in, etc)

Created: 22/Jul/09 05:48 PM Updated: 10/Sep/09 07:45 PM

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Component/s:

Performance

Affects Version/s:

1.26 Server, 1.27 Server

Fix Version/s:

None

Issue Links:

Duplicate

This issue duplicates:

SVC-4196 Avatar entering sim or rezzing object causes sim to freeze for up to 30 seconds - everything stops for everybody there

This issue is original of duplicate:

~~SVC-4739~~ Sim freezes each time someone tp in or tp out, log in/log out - for a couple seconds untill new awatar arrives sim or leaves sim

Relates

This issue Relates to:

SVC-3895 Rezzing Mono scripted object cripples sim FPS

SVC-4196 Avatar entering sim or rezzing object causes sim to freeze for up to 30 seconds - everything stops for everybody there

SVC-206 When new users teleport into a non-empty region, Agent Time spikes and sim performance drops signfigantly for a short period time

This issue is related to by:

~~SVC-4732~~ Declining service affecting regions

Last Triaged:	23/Jul/09 11:42 AM
Linden Lab Issue ID:	DEV-36444

Description

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Any time somebody even a little heavy with scripts and or prim attachments enter a region, the region seems to stall. No physics updates, no script time, chat gets misordered or just plain lost, all sorts of bad.

This is pretty easy to demonstrate, even on an idle region. Just fly in circles - hold the up and left arrows down - then have a prim/script heavy friend TP in. As the sim stalls and stops sending you updates, you'll go flying off in a straight line. Once the sim wakes back up, you'll snap back to flying in circles.

On a high-traffic area, like I have, having the sim just stop responding for 30 seconds every few minutes is really, really painful.

See also: ticket 4051-6355174 and chat 4051-360499. Also chatted with a ComSys person about this and showed him the problem but a recent uninstall of the RC viewer seems to have eaten all my IM logs and chat logs from the last 3 years - don't have a copy of that one.

I don't think this is SVC-4196 or SVC-3895 unless those seriously understate the impact of this issue.

I also wandered around to find regions hosted in SanFran, Dallas and Phoenix and could repro the problem on all of them.

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Comments

Change History

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Sindy Tsure added a comment - 23/Jul/09 06:30 AM

/me sees Harleen link to SVC-206, which talks about a perf drop when somebody TPs in.

This problem here isn't a drop in performance. It's not like the sim fps dips for a bit - it's more like everything stops. You can be watching the sim fps sit at 45 and if the problem happens, the sim fps will still be reading 45. If you look close, you'll notice that it's none of the sim stats are being updated and that's just the last value it displayed.

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Sindy Tsure added a comment - 28/Jul/09 09:02 PM

These don't seem to show up in the sim stats, BTW.. I just watched my home do this several times for a solid 10 seconds each and when it came back, the sim FPS stat just showed a small dip in performance.

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Seric Serupta added a comment - 09/Aug/09 12:29 PM

Sometimes we have events which start at a certain time and when everyone is porting in, the sim is pretty much stopped until all guests have finished porting.

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Ovaltine Constantine added a comment - 18/Aug/09 02:06 PM

I have a HUD that displays both region time dilation and the number of people in the region. Sometimes the time dilation will jump from near zero to around 80%, then right after that, the number of people in the sim goes up...so yeah, this shows up in the sim stats.

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Sindy Tsure added a comment - 19/Aug/09 12:29 PM

Time dilation is something you want to be close to 1.0 - that's as happy as a sim can get.

I guess my point was that if you're trying to measure anything other than how the sim is performing "right now", these numbers will not tell you.

Like, if the sim is crusing along at 45 fps then totally locked up for 30 seconds then snapped back to being happy, what would you expect the next 10 sim fps values to be? They wouldn't (and probably shouldn't) reflect that the sim went away for a while - they would tell you that the sim is perfectly happy.

If you have a scripted object or bot that is watching performance for you and it only relies on the raw "right now" readings, it's probably giving you numbers that are not very accurate.

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Argent Stonecutter added a comment - 29/Aug/09 07:07 AM

Try recompiling your attachments as LSL. See if that makes a difference. See SVC-3895.

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Sindy Tsure added a comment - 04/Sep/09 01:19 PM - edited

Great. I'll just tell everybody who comes into my 25k traffic club to recompile all their attachments so they don't cause everybody else there to lock up. Thanks. I'll get right on that.

edit:

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Winter Ventura added a comment - 10/Sep/09 07:45 PM

resolving as duplicate of SVC-3895 (566 votes) and/or SVC-4196 (188 votes)