{"id":1733,"date":"2012-01-16T22:42:02","date_gmt":"2012-01-16T22:42:02","guid":{"rendered":"http:\/\/sl.governormarley.com\/?p=1733"},"modified":"2012-01-16T22:52:06","modified_gmt":"2012-01-16T22:52:06","slug":"llsetmemorylimit-mono-and-a-bit-of-confusion","status":"publish","type":"post","link":"https:\/\/sl.governormarley.com\/?p=1733","title":{"rendered":"llSetMemoryLimit Mono And A Bit Of Confusion"},"content":{"rendered":"

I’m going to talk here about a relatively new scripting function, llSetMemoryLimit<\/a>, this may not work the way one thinks it does, but it basically sets the upper memory limit your script can use. I’m far from being a scripting expert but this looks like a function that people should get used to using where they can, even if it might not actually save memory for a sim the way we may think it should, I’m not sure how the server handles the space.<\/p>\n

Anyway, when you create a new script, if Mono is ticked, it has an upper memory limit of 64kb, if you don’t compile the script as Mono, it compiles as LSO, and that has an upper memory limit of 16kb, with LSO it’s a hard rule, all LSO scripts have an upper limit of 16kb, llSetMemoryLimit won’t work with LSO, with Mono however you can set a lower limit. In this post I’ll show how this works with a very basic script, a notecard giver.<\/p>\n

I’ll start by visiting LSL Wiki <\/a>and going to the llGiveInventory section<\/a>. LSL Wiki isn’t as up to date as the LSL portal <\/a>but I often find the discussions and examples\u00a0on LSL Wiki\u00a0more helpful. So all I want is a notecard giver, I rez a prim, go to the contents tab, click new script, get the default hello world script, delete everything and replace it with this (with apologies for the horrid coding style):<\/p>\n

default<\/em>
\n{<\/em>
\nstate_entry()<\/em>
\n{<\/em>
\n}<\/em>
\ntouch_start(integer total_number)<\/em>
\n{<\/em>
\nllGiveInventory(llDetectedKey(0),llGetInventoryName(INVENTORY_NOTECARD, 0));<\/em>
\n}<\/em><\/p>\n

Then I make sure there’s a notecard in the contents of the prim and when I touch it, I’ll get a Notecard. However this is a Mono script so it defaults to an upper memory limit of 64kb:<\/p>\n

\"Default<\/a><\/p>\n

So let’s look at how we can reduce that using llSetMemoryLimit()<\/p>\n

<\/p>\n

Now the first thing to note here is that I wouldn’t put a for sale script out there using this method, but it gives you an idea of how things work. There are a few ways of getting an idea of how much memory a script uses but what I’m going to do here is use llScriptProfiler<\/a> and base my test on the example there. Note the caveats there, having the profiler on adds to overheads. I’m going to run the profiler, find out how much memory the script uses then set my memory limit to that figure, I wouldn’t advise people do this for production scripts, I’d add some spare capacity, but this gives you an idea on what you can do. My new script will look like this:<\/p>\n

integer limit = 64000;<\/em>
\n{<\/em>
\ndefault<\/em>
\n{<\/em>
\nstate_entry()<\/em>
\n{<\/em>
\nllSetMemoryLimit(limit);<\/em>
\n}<\/em>
\ntouch_start(integer total_number)<\/em>
\n{<\/em>
\nllScriptProfiler(PROFILE_SCRIPT_MEMORY);<\/em>
\nllGiveInventory(llDetectedKey(0),llGetInventoryName(INVENTORY_NOTECARD, 0));<\/em>
\nllScriptProfiler(PROFILE_NONE);<\/em>
\nllOwnerSay(“This script used at most ” + (string)llGetSPMaxMemory() + ” bytes of memory during Touching.”);<\/em>
\nlimit = llGetSPMaxMemory();<\/em>
\nllSetMemoryLimit(limit);<\/em>
\n}<\/em>
\n}<\/em><\/p>\n

Now when I touch the script, I’ll see this:<\/p>\n

\"Message<\/a><\/p>\n

Then when I go to about land and look at script info under the general tab, I’ll see that it is indeed only reporting my script as 4kb:<\/p>\n

\"Notecard<\/a><\/p>\n

Then I go a bit mad and rez another three of these objects, touch them a couple of times to make sure they don’t crash and then find that about land\/script info now shows this:<\/p>\n

\"4<\/a><\/p>\n

Now is the point where I get confused, I’m not sure what this actually does in terms of saving memory allocations or whether it does indeed do that. Yes I can reduce the way my script gets reported, but my notecard script would never use more than the amount llScriptProfiler reported, indeed it uses more than it needs to because I’m running the profiler. Someone like Kelly Linden would be needed to explain how this actually works, whether it saves any memory and whether it’s actually useful, I see it as a good practice tool.<\/p>\n

However, depending upon your script, you’d need to be careful with this, for simple scripts it’s fine but for scripts where\u00a0users may be adding variables or data to lists, you’re going to want to leave room for your script to grow and just how much memory you need for that, only time will tell.<\/p>\n

So as it stands I’d treat this with caution, but it’s worth noting and worth using when you can just to get into the habit of using it and knowing yourself that your scripts aren’t eating up huge amounts of memory.<\/p>\n","protected":false},"excerpt":{"rendered":"

I’m going to talk here about a relatively new scripting function, llSetMemoryLimit, this may not work the way one thinks it does, but it basically sets the upper memory limit your script can use. I’m far from being a scripting expert but this looks like a function that people should get used to using where … <\/p>\n

Continue reading “llSetMemoryLimit Mono And A Bit Of Confusion”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[3,14],"tags":[19,272,321,322,1022],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p6rJUK-rX","jetpack-related-posts":[],"jetpack_likes_enabled":false,"_links":{"self":[{"href":"https:\/\/sl.governormarley.com\/index.php?rest_route=\/wp\/v2\/posts\/1733"}],"collection":[{"href":"https:\/\/sl.governormarley.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sl.governormarley.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sl.governormarley.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/sl.governormarley.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1733"}],"version-history":[{"count":4,"href":"https:\/\/sl.governormarley.com\/index.php?rest_route=\/wp\/v2\/posts\/1733\/revisions"}],"predecessor-version":[{"id":1735,"href":"https:\/\/sl.governormarley.com\/index.php?rest_route=\/wp\/v2\/posts\/1733\/revisions\/1735"}],"wp:attachment":[{"href":"https:\/\/sl.governormarley.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1733"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sl.governormarley.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1733"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sl.governormarley.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1733"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}