Styjun

Semantic difference between regular and irregular 'backen'

Anyone else seeing white rings in the Undead parish?

Does this VCO produce a sine wave or square wave

How can I reorder triggered abilities in Arena?

How many birds in the bush?

Expressing the act of drawing

Ghidra: Prepend memory segment in assembly listing view

Movie where people enter a church but find they can't leave, not in English

How many lines of code does the original TeX contain?

When calculating a force, why do I get different result when I try to calculate via torque vs via sum of forces at an axis?

Could this kind of inaccurate sacrifice be countered?

about to retire but not retired yet, employed but not working any more

Talk interpreter

Are game port joystick buttons ever more than plain switches? Is this one just faulty?

Redacting URLs as an email-phishing preventative?

Prison offence - trespassing underwood fence

Can $! cause race conditions when used in scripts running in parallel?

How to maximize the drop odds of the Essences in Diablo II?

Why is the UK so keen to remove the "backstop" when their leadership seems to think that no border will be needed in Northern Ireland?

Why are non-collision-resistant hash functions considered insecure for signing self-generated information

Do Bayesian credible intervals treat the estimated parameter as a random variable?

Server Integrity Check CheckCommands question

Was the Boeing 2707 design flawed?

Discussing work with supervisor in an invited dinner with his family

Managing LOH in vb.net

What is the difference between And and AndAlso in VB.NET?Is there a conditional ternary operator in VB.NET?Multiline strings in VB.NETClasses vs. Modules in VB.NETHow to insert values into VB.NET Dictionary on instantiation?What is the VB.NET equivalent of the C# “is” keyword?Is there a VB.NET equivalent of C# out parameters?LOH internals wantedEntity Framework, binary data and LOHLOH benchmarking using benchmarkdotnet

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

-1

I have an vb.net application I distribute to my analysts – We assign perhaps 100 200MB images at a time. The app sequentially opens the large jpg image using GDI+ and the image is placed in the LOH. I scan each pixel looking for data. - when done I dispose the image and use GC.collect. But this does not clear the LOH, and as a result the LOH keeps increasing until the app crashes. A work around is to chop the assignment into 25 instance chunks, but this is risky as our analysts often do this late at night – perhaps after a beer or 2.

The C# construct is

 GCSettings.LargeObjectHeapCompactionMode = GCLargeObjectHeapCompactionMode.CompactOnce

but there is no GCSettings available in vb.net

My vb.net code is

 loadedImage.Dispose()
 MasterImage.Dispose()

 GC.Collect()
 Finalize()

But I cannot find a vb.net method to force the LOH compaction

When done

Can you help?

vb.net c#-to-vb.net large-object-heap

share|improve this question

edited Mar 27 at 19:33

J...

25.5k55 gold badges5353 silver badges115115 bronze badges

asked Mar 27 at 19:24

RfrankRfrank

1633 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not possible if targeting < 4.5.1, also should you be using compaction...
  
  – Çöđěxěŕ
  Mar 27 at 20:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you don't want to use a memory profiler then you just need more beer. Project > Properties > Compile tab > untick the "Prefer 32-bit" checkbox.
  
  – Hans Passant
  Mar 27 at 22:20
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi and thanks - I do have t32-bit unchecked, now on .net 4.6.1 I like memory profiling better than beer, so 2 snapshots at some distance from each other showed almost no change in heap sizes but the process memory went from 681MB to 15.3 GB - so about 350MB per image is not released back to the system. I will try adding a 'Finally to the single try/catch block, but the catch is never used. Looking at GC not releasing . . . topic now
  
  – Rfrank
  Mar 28 at 20:20
  

  
  
  
  

add a comment | 

-1

I have an vb.net application I distribute to my analysts – We assign perhaps 100 200MB images at a time. The app sequentially opens the large jpg image using GDI+ and the image is placed in the LOH. I scan each pixel looking for data. - when done I dispose the image and use GC.collect. But this does not clear the LOH, and as a result the LOH keeps increasing until the app crashes. A work around is to chop the assignment into 25 instance chunks, but this is risky as our analysts often do this late at night – perhaps after a beer or 2.

The C# construct is

 GCSettings.LargeObjectHeapCompactionMode = GCLargeObjectHeapCompactionMode.CompactOnce

but there is no GCSettings available in vb.net

My vb.net code is

 loadedImage.Dispose()
 MasterImage.Dispose()

 GC.Collect()
 Finalize()

But I cannot find a vb.net method to force the LOH compaction

When done

Can you help?

vb.net c#-to-vb.net large-object-heap

share|improve this question

edited Mar 27 at 19:33

J...

25.5k55 gold badges5353 silver badges115115 bronze badges

asked Mar 27 at 19:24

RfrankRfrank

1633 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not possible if targeting < 4.5.1, also should you be using compaction...
  
  – Çöđěxěŕ
  Mar 27 at 20:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you don't want to use a memory profiler then you just need more beer. Project > Properties > Compile tab > untick the "Prefer 32-bit" checkbox.
  
  – Hans Passant
  Mar 27 at 22:20
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi and thanks - I do have t32-bit unchecked, now on .net 4.6.1 I like memory profiling better than beer, so 2 snapshots at some distance from each other showed almost no change in heap sizes but the process memory went from 681MB to 15.3 GB - so about 350MB per image is not released back to the system. I will try adding a 'Finally to the single try/catch block, but the catch is never used. Looking at GC not releasing . . . topic now
  
  – Rfrank
  Mar 28 at 20:20
  

  
  
  
  

add a comment | 

I have an vb.net application I distribute to my analysts – We assign perhaps 100 200MB images at a time. The app sequentially opens the large jpg image using GDI+ and the image is placed in the LOH. I scan each pixel looking for data. - when done I dispose the image and use GC.collect. But this does not clear the LOH, and as a result the LOH keeps increasing until the app crashes. A work around is to chop the assignment into 25 instance chunks, but this is risky as our analysts often do this late at night – perhaps after a beer or 2.

The C# construct is

 GCSettings.LargeObjectHeapCompactionMode = GCLargeObjectHeapCompactionMode.CompactOnce

but there is no GCSettings available in vb.net

My vb.net code is

 loadedImage.Dispose()
 MasterImage.Dispose()

 GC.Collect()
 Finalize()

But I cannot find a vb.net method to force the LOH compaction

When done

Can you help?

vb.net c#-to-vb.net large-object-heap

share|improve this question

edited Mar 27 at 19:33

J...

25.5k55 gold badges5353 silver badges115115 bronze badges

asked Mar 27 at 19:24

RfrankRfrank

1633 bronze badges

 GCSettings.LargeObjectHeapCompactionMode = GCLargeObjectHeapCompactionMode.CompactOnce

 loadedImage.Dispose()
 MasterImage.Dispose()

 GC.Collect()
 Finalize()

share|improve this question

edited Mar 27 at 19:33

J...

25.5k55 gold badges5353 silver badges115115 bronze badges

asked Mar 27 at 19:24

RfrankRfrank

1633 bronze badges

share|improve this question

edited Mar 27 at 19:33

J...

25.5k55 gold badges5353 silver badges115115 bronze badges

asked Mar 27 at 19:24

RfrankRfrank

1633 bronze badges

edited Mar 27 at 19:33

J...

25.5k55 gold badges5353 silver badges115115 bronze badges

edited Mar 27 at 19:33

J...

25.5k55 gold badges5353 silver badges115115 bronze badges

asked Mar 27 at 19:24

RfrankRfrank

1633 bronze badges

asked Mar 27 at 19:24

RfrankRfrank

1633 bronze badges

1 Answer
1

active

oldest

votes

0

GCSettings.LargeObjectHeapCompactionMode was added in .NET 4.5.1. It exists in VB.NET as well as C#. You're probably targeting a lower version of the .NET runtime. If you want access to this feature you will need to compile against a framework version of 4.5.1 or higher.

This likely won't solve the underlying problem, however. Your leak may not even be where you think it is. Profiling your application with an allocation profiler is the best way to track down resource leaks. Without a Minimal, Complete, and Verifiable example, it is difficult to guess where your application may be going wrong.

share|improve this answer

edited Mar 27 at 22:06

answered Mar 27 at 19:38

J...J...

25.5k55 gold badges5353 silver badges115115 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi and thanks - I was using the v4.0 which was available in 2007 when i first wrote the app, I went to 4.6.1 and found the GCSettings and used it in a runtime construct - it runs - but is not solving the problem. For testing - i have a 4 image set - so I will expand the data set to a full production run and retest. It is possible I do not understand the issue . Is there a way to see the contents of memory by variable name?
  
  – Rfrank
  Mar 27 at 20:59
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Rfrank I think that's a topic for a follow-up question. See : What is the the best way to ask follow up questions?
  
  – J...
  Mar 27 at 22:04
  

  
  
  
  

add a comment | 

Your Answer

StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");

StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);

else
createEditor();

);

function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);



);

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f55385034%2fmanaging-loh-in-vb-net%23new-answer', 'question_page');

);

Post as a guest

Name

Email

Required, but never shown

0

GCSettings.LargeObjectHeapCompactionMode was added in .NET 4.5.1. It exists in VB.NET as well as C#. You're probably targeting a lower version of the .NET runtime. If you want access to this feature you will need to compile against a framework version of 4.5.1 or higher.

This likely won't solve the underlying problem, however. Your leak may not even be where you think it is. Profiling your application with an allocation profiler is the best way to track down resource leaks. Without a Minimal, Complete, and Verifiable example, it is difficult to guess where your application may be going wrong.

share|improve this answer

edited Mar 27 at 22:06

answered Mar 27 at 19:38

J...J...

25.5k55 gold badges5353 silver badges115115 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi and thanks - I was using the v4.0 which was available in 2007 when i first wrote the app, I went to 4.6.1 and found the GCSettings and used it in a runtime construct - it runs - but is not solving the problem. For testing - i have a 4 image set - so I will expand the data set to a full production run and retest. It is possible I do not understand the issue . Is there a way to see the contents of memory by variable name?
  
  – Rfrank
  Mar 27 at 20:59
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Rfrank I think that's a topic for a follow-up question. See : What is the the best way to ask follow up questions?
  
  – J...
  Mar 27 at 22:04
  

  
  
  
  

add a comment | 

0

GCSettings.LargeObjectHeapCompactionMode was added in .NET 4.5.1. It exists in VB.NET as well as C#. You're probably targeting a lower version of the .NET runtime. If you want access to this feature you will need to compile against a framework version of 4.5.1 or higher.

This likely won't solve the underlying problem, however. Your leak may not even be where you think it is. Profiling your application with an allocation profiler is the best way to track down resource leaks. Without a Minimal, Complete, and Verifiable example, it is difficult to guess where your application may be going wrong.

share|improve this answer

edited Mar 27 at 22:06

answered Mar 27 at 19:38

J...J...

25.5k55 gold badges5353 silver badges115115 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi and thanks - I was using the v4.0 which was available in 2007 when i first wrote the app, I went to 4.6.1 and found the GCSettings and used it in a runtime construct - it runs - but is not solving the problem. For testing - i have a 4 image set - so I will expand the data set to a full production run and retest. It is possible I do not understand the issue . Is there a way to see the contents of memory by variable name?
  
  – Rfrank
  Mar 27 at 20:59
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Rfrank I think that's a topic for a follow-up question. See : What is the the best way to ask follow up questions?
  
  – J...
  Mar 27 at 22:04
  

  
  
  
  

add a comment | 

GCSettings.LargeObjectHeapCompactionMode was added in .NET 4.5.1. It exists in VB.NET as well as C#. You're probably targeting a lower version of the .NET runtime. If you want access to this feature you will need to compile against a framework version of 4.5.1 or higher.

This likely won't solve the underlying problem, however. Your leak may not even be where you think it is. Profiling your application with an allocation profiler is the best way to track down resource leaks. Without a Minimal, Complete, and Verifiable example, it is difficult to guess where your application may be going wrong.

share|improve this answer

edited Mar 27 at 22:06

answered Mar 27 at 19:38

J...J...

25.5k55 gold badges5353 silver badges115115 bronze badges

share|improve this answer

edited Mar 27 at 22:06

answered Mar 27 at 19:38

J...J...

25.5k55 gold badges5353 silver badges115115 bronze badges

answered Mar 27 at 19:38

J...J...

25.5k55 gold badges5353 silver badges115115 bronze badges

answered Mar 27 at 19:38

J...J...

25.5k55 gold badges5353 silver badges115115 bronze badges