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chad556

Word of Caution if coming or going to Guam in FSX

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For the past week, I have been pulling my hair out trying to figure out why Can t land at PGUM without getting the dreaded OOM error then crash. Turns out the freeware scenery on Avsim and Flightsim.com is crap. Its called Guam X V2 by Morten Linde. The scenery looks beautiful, if it worked. Upon loading ANY aircraft onto the airport, the scenery immediate gobbles up at least 3.9gb of VAS memory. Those of you who have done the research on VAS memory in FSX and OOM errors know that this scenario is a no-go. I cant believe the guy released it without doing a few tests for memory leaks, etc. The ILS frequencies are also incorrect. 

 

With that said, I challenge any of you to load up at PGUM in the PMDG 737NGX using the freeware scenery named Guam X V2 by Morten. Keep in mind, I have HD textures disabled completely in my sim, and in the NGX. My LOD radius is 4.5 and I have NO buffer pools at this time.

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Wow, I just checked your PC specs, given the powerhouse of computer you are running that is amazing.

 

Interesting, while I have not tried that scenery, in all my years with a heavily loaded FSX, I have never had an OOM error.  Lucky me.

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Yeah, unfortunately that scenery just doesn't work. It will OOM in the default trike!

 

Seems amazing that the designer didn't test it at all, apparently.

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I can't comment one way or another on the scenery, since I don't have it.  but your specs say you have 4 gb of video memory,  which in dx9 is mirrored in VAS,  so if you load that up, you are losing headroom in VAS.  are you using dx9 or dx10?

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I can't comment one way or another on the scenery, since I don't have it.  but your specs say you have 4 gb of video memory,  which in dx9 is mirrored in VAS,  so if you load that up, you are losing headroom in VAS.  are you using dx9 or dx10?

Using dx9. It really shouldn't matter though, FSX is only capable of handling 4gb of VAS due to its 32 bit platform. 

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yes,  but the difference is that dx9 mandates that whatever you have in video memory be mirrored in VAS,  not such a big deal with a 1 gb card,  but your monster 4 gb card could theoretically take out your entire VAS space if it's using all it's memory (which it might be if this scenery isn't optimized)  dx10 doesn't mirror anything into VAS, so you have a lot more headroom to play with.  somebody with a lesser video card might not be seeing this problem.  I'll see if I can download and test it sometime tomorrow,  this has me curious.

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yes,  but the difference is that dx9 mandates that whatever you have in video memory be mirrored in VAS,  not such a big deal with a 1 gb card,  but your monster 4 gb card could theoretically take out your entire VAS space if it's using all it's memory (which it might be if this scenery isn't optimized)  dx10 doesn't mirror anything into VAS, so you have a lot more headroom to play with.  somebody with a lesser video card might not be seeing this problem.  I'll see if I can download and test it sometime tomorrow,  this has me curious.

 

Wow, that makes a lot sense actually. Thanks for taking the time to explain that. Please report back with your findings. BTW I'm using a GTX 690 card. I know the critics dont recommend using a massive dual GPU card like this for FSX, but I need it for other applications. Looking forward to your results. 

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So, with a 4 GB video card and using DX9, I will OOM anywhere/anytime? That's actually hard to believe ...

 

BTW, anyone measured VAS with the Aerosoft payware 'African Airstrip Adventures'? I was puzzled by the fact, that you can OOM there even in a GA plane(!) if your settings are too high?!? (Pls. note there's no huge highly-detailled airport in the scenery area.)

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It actually works fine for me, well, by fine I mean it doesn't crash, I get ~8fps on the runway, and ~22fps in the air.

 

I notice that the author states that he's reworking it for v3 and removing things that cause the massive fps loss.

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So, with a 4 GB video card and using DX9, I will OOM anywhere/anytime? That's actually hard to believe ...

 

I'm using Radeon 6990 which has 4GB of video memory and I don't have problems with OOM while using DX9. 

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just because you have a 4 gb card doesn't mean that your card is constantly using 4gb,  in fact,  most of the time, you probably aren't using any more video memory than anyone else,  But if something happens to cause you to use that much,  then it would be OOM city in dx9.  my 2gb card has caused me lots of trouble with different scenery, that's why I switched to dx10.  it's not a simple thing though, that you can make a blanket statement about it,  but it is a possible source of the OP's issues.

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yes, but the difference is that dx9 mandates that whatever you have in video memory be mirrored in VAS,

 

This doesn't work the way you seem to think it does.  In the old days of 32 bit systems, where EVERYTHING - every device and card - had to be mapped into a total of 4 GB of addressable space and any video memory used did have to be completely mirrored, large cards like this would've been a disaster - basically impossible.  Now, on a 64 bit system, the card itself lives in it's own address space and doesn't compete with other stuff.  The mirroring only occurs in DX9 when you start to actually use VRAM.  The 4 Meg card's VRAM isn't mirrored back to the application's VAS - it's the other way around - the application keeps a mirror of what it sends to the card, and even then, ever since a patch back in the Vista days (pre-service pack 1 Vista) NOT EVERYTHING has to be mirrored.  This was a fix made for "legacy" DX versions (9 and previous) to help with these kinds of problems.

 

Yes, some mirroring occurs, and DX10/11 is generally better in this regard as it doesn't require mirroring in the application's address space at all, but the DX9 situation isn't quite the disaster typically depicted. If it was, most of us would be OOMing most of the time. :-)

 

Scott

 

Edit:  Ah, I see your clarification posted while I was typing!

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I had the same issue here.  I deactivated 38 bgls, mainly all the various ones with cars, cabs, buses, people cows etc  . . .) -  got it work acceptably.  Much of what I removed was smaller items, really did not see a visual difference flying in and out in heavy iron.

 

Overall I like the author's efforts, hope he looks at a VAS friendly v3.

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Wow, I just checked your PC specs, given the powerhouse of computer you are running that is amazing.

 

Interesting, while I have not tried that scenery, in all my years with a heavily loaded FSX, I have never had an OOM error.  Lucky me.

 

What a completely pointless and unnecessary comment, this is a topic about OOM errors with certain freeware scenery. Nobody cares that you back off on sliders and don't run much complicated addons.

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I'm using Radeon 6990 which has 4GB of video memory and I don't have problems with OOM while using DX9.

And I have a 7970 with 3 GBs of ram and I fly all over the place for hours in DirectX9 and I've never seen an OOM ever. This is over FTX scenery in the PMG js41.

 

I have to call BS on the video card RAM affecting the VAS.

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What a completely pointless and unnecessary comment, this is a topic about OOM errors with certain freeware scenery. Nobody cares that you back off on sliders and don't run much complicated addons.

 

Wow David! If you didn't care why insult me like this.  It's a face value comment, nothing more, nothing less and your appraisal is totally false. If a reader does not care or things the comment of no value...then just move on.  I said that I did not have that scenery, I said that given the powerhouse of a computer the fellow has that that is amazing. And that I'm lucky to not have OOM errors. I did not pass judgement.  Some people just make face value comments, and there is not intent or hidden meaning.

 

FYI - (and this is a face value comment in response to your interest in my setup - nothing more and nothing less, this is not mine is bigger than yours)  and I have all sliders at max, although I do drop back autogen to dense from extreme when in high urban areas. I run traffic, road, aircraft AI, ships etc at 20%.  I have over 600 layers of scenery, many purchased 100s of scenery scenery products including almost every Orbx product not including the recent England airports, FS Addon Vancouver Plus, Victoria Plus, Tongass Fjords, MIsty Fjords, FS Dream Team airports etc etc,  I have UTX, I have GEX, I have REX, I have Instant approach, Instant Scenery, and many other addons....I have 100s of planes, a huge suite of commercial addon planes. I have 100s of freeware sceneries, 100s of freeware planes.

 

The total size of my FSX = 443 gigs, not including some photoscenery from Bluesky that I keep on another drive because of its size and I turn it on and off as I feel appropriate.

 

Have a good day.

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Hmm. Curiously enough, I have had the scenery since before its release, but I have yet to visit it :/

 

 

 


The ILS frequencies are also incorrect. 

 

IIRC the scenery was made shortly before some rebuilding was done in Guam... might be the reason.

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With that said, I challenge any of you to load up at PGUM in the PMDG 737NGX using the freeware scenery named Guam X V2 by Morten

I fly into and out of PGUM a couple times a month with this scenery and the PMDG B747/MD11 and do not have any problems.

 

Billy Bluestar

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And I have a 7970 with 3 GBs of ram and I fly all over the place for hours in DirectX9 and I've never seen an OOM ever. This is over FTX scenery in the PMG js41.

 

I have to call BS on the video card RAM affecting the VAS.

 

 

ORBX use their textures in a very efficient way. They never fill my 1 GB VRAM despite all the details, so they won't fill your 3 GB, either.

 

And I've learned today, it's not the complete VRAM that gets mirrored in VAS but only the actual VRAM in use (and there's probably more 'fineprint' to that).

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I fly into and out of PGUM a couple times a month with this scenery and the PMDG B747/MD11 and do not have any problems.

 

 

That's surprising (to put it mildly), given that the scenery on its own appears to take up nearly 4 GB of VAS. Have you deactivated any bgls?

 

Genuinely curious--I'm not trolling.

 

James

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That's surprising (to put it mildly), given that the scenery on its own appears to take up nearly 4 GB of VAS. Have you deactivated any bgls?

 

Genuinely curious--I'm not trolling.

 

James

I agree. I simply don't see how it's possible to fly into it out of this scenery without ooms. Running a vas memory tool clearly shows it taking up 3.9gb of vas immediately upon loading up in the default Cessna 172. Also, the author of the scenery replied to the email I sent him asking about a fix. He was kind and acknowledged the issue. He said he was aware of the vas memory usage and that he is diligently working to correct it. The only way I can fathom using this scenery is with horrible anti aliasing settings, no weather, and mid sliders. Even then you'll be lucky to me it to your destination airport without an oom.

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That's surprising (to put it mildly), given that the scenery on its own appears to take up nearly 4 GB of VAS. Have you deactivated any bgls?

 

Genuinely curious--I'm not trolling.

 

James

I flew it today from VHHH to PGUM using the PMDG B747 and my VAS on landing was 3.2.

 

Billy Bluestar

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