[BUG-231962] Top Scripts - Inaccurate reporting of memory consumption

[sl-service-account]

What just happened?

The Top Scripts dialog does not seem to report how much memory is being consumed by a scripted object. For example, a game object that contains two scripts, both scripts which are known to be consuming almost the full amount of memory allotted shows up as only using 64 kb of memory in the region. This is different than the memory mentioned in the About Land (Script Info) button which indicates 128 kb.

This currently isn't helpful in determining which objects to remove to improve performance. If this memory column means something else perhaps it can be renamed to "Free memory" and a new column could be created to the left of it that reads "Used memory" which would be handy in determining the load of an object on a region.

What were you doing when it happened?

Maintaining a region by looking for poor performing objects, e.g. by consuming too much memory.

What were you expecting to happen instead?

Expected the performance tools to provide accurate information that can be used in making this determination.

Other information

Original Jira Fields

| Field | Value | | ------------- | ------------- | | Issue | BUG-231962 | | Summary | Top Scripts - Inaccurate reporting of memory consumption | | Type | Bug | | Priority | Unset | | Status | Closed | | Resolution | Cannot Reproduce | | Created at | 2022-03-25T04:38:56Z | | Updated at | 2022-03-28T17:03:24Z | ``` { 'Build Id': 'unset', 'Business Unit': ['Platform'], 'Date of First Response': '2022-03-25T18:11:12.724-0500', 'ReOpened Count': 0.0, 'Severity': 'Unset', 'System': 'SL Simulator', 'Target Viewer Version': 'viewer-development', 'What just happened?': 'The Top Scripts dialog does not seem to report how much memory is being consumed by a scripted object. For example, an game object that contains two scripts, both scripts which are known to be consuming almost the full amount of memory allotted shows up as only using 64 bytes of memory in the region. This currently isn\'t helpful in determining which objects to remove to improve performance.\r\n\r\nIf this memory column means something else perhaps it can be renamed to "Free memory" and a new column could be created to the left of it that reads "Used memory" which would be handy in determining the load of an object on a region.\r\n', 'What were you doing when it happened?': 'Maintaining a region by looking for poor performing objects, e.g. by consuming too much memory.', 'What were you expecting to happen instead?': 'Expected the performance tools to provide accurate information that can be used in making this determination.', } ```

[sl-service-account]

Maestro Linden commented at 2022-03-25T23:11:13Z

Hi Send, can you post an example script that demonstrates this behavior? Also, does it reproduce for new objects after you add the scripts to them?

I set up a trivial "high memory usage" script, which reports "llGetUsedMemory() returns 64346" when touched. I placed 2 copies of this script in a box, and found that both "Top Scripts" and "About Land -> "Script Info" report 128KB for the object - which is correct. Here's the source for the script:

string bigString = "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456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default
{
    state_entry()
    {
        llSay(0, "touch me for a memory assessment");
    }

    touch_start(integer total_number)
    {
        llSay(0, "llGetUsedMemory() returns " + (string)llGetUsedMemory());
    }
}

Note that are some related bugs for script memory reporting in About Land and related interfaces - BUG-231312 and BUG-229875 are two examples. In some cases, the repro is to add or remove scripts in a specific sequence to throw off the memory reporting. I believe there's another case in which resetting or recompiling the script can cause the object's total script memory usage to appear off.

[sl-service-account]

palisade.coronet commented at 2022-03-26T12:30:43Z, updated at 2022-03-27T10:52:59Z

It turns out the 2nd script was using up the 64kb of script memory and then was being a good neighbor and releasing it by emptying lists when not in use. That's why the Top Scripts showed the actual usage at 64kb because the 1st script needed all 64kb and couldn't release it.

It's interesting though that About Land always showed the object containing the two scripts as using 128kb even when it wasn't, so there's definitely some sort of inconsistency between the two methods of checking memory. About Land must be updating infrequently or is taking a more critical view of usage.

I can close out this ticket as soon as you get a chance to read this. It seems to not really be an issue and more of a slight discrepancy between the two ways of listing memory.

[sl-service-account]

Maestro Linden commented at 2022-03-28T17:03:24Z

Thanks for the follow up on this issue!