Is the concept of virtual memory about memory isolation or the ability to exchange? Or both?

Most of the readings I've found on virtual memory, such as http://www.linux-tutorial.info/modules.php?name=MContent&pageid=89 or https://en.wikipedia.org/ wiki / Virtual_memory always indicate that virtual memory is a concept that allows the operating system to make it "appear as if you have more memory than you really have".

But is not that the over-commitment is about? Is not the concept of virtual memory as a whole primarily concerned that each process has an isolated virtual memory pool, thus preventing the reading or modification of the memory of another process?

If not, how is this memory isolation technology called within its own virtual memory pools?

virtualization – the integrity of Windows 10 memory does not start due to incompatibility

I use Windows 10 v1809. Whenever I try to enable the integrity of Windows memory, I get an error saying that Windows memory can not boot because there may be an incompatibility. I know that my computer is capable of performing memory integrity, as I had already lit it successfully in the past (with the help of v1809). I suspect that it may be connected to the extra features offered by the control panel because a long time ago, when I activated it successfully, I was kidding these features. Does anyone know which ones need to be activated or there is something else that I need to perform?

mmap () failed: [12] Can not allocate a memory problem

When I try to execute a command, I get an error at the bottom of the command line

mmap () failed: (12) Can not allocate memory

enter the description of the image here

Please help me as soon as possible.

c # – Using shared memory instead of collecting native C ++ plug-ins in Unity?

So I am a C ++ developer who has been using C # for a week or two to become familiar with Unity and I am curious about the marshalling process used to transfer data for use in native C ++ plugins. From what I can say, the general consensus is that if the use of efficient C ++ plug-ins can represent an increase in performance for heavy computing tasks, the data transfer process may to be considerably slower than the potential gains from C ++ flexibility.

I am very familiar with how C ++ shared memory works, and it appears that C # also has the functionality required to use buffers. From what I understand, the marshalling process is slow due to copying, creating buffers and transferring pieces from one heap to another. Even though the problem of cache coherency when using shared memory may be less than the cost generated by marshalling. I'm sure I'll have to experiment.

Does anyone have any ideas or experience of using shared memory or gathering in Unity that could answer the question?

Insufficient Memory – Droid Turbo 2 Storage Does Not Clear

We often receive storage messages on our Motorola Droid Turbo 2 phone. We are removing an app and, say it's a 100MB application, we only see about 10MB of free space . Similarly, we have transferred and deleted gigabytes of photos and videos from the phone, but only a tiny amount of space is freed. We delete and delete and delete, but we still have no place.

At the moment, "Internal Shared Storage" indicates 23.27 GB used of 24.06 GB but only 5.06 GB used for the applications and 7.32 GB used for the images, 18.73 MB for the videos, 0 for the audio, 475 MB for others and only 1.34 MB for cached data (so these are not cached data). These do not total more than 23.27 GB! The number of applications and images decreases as and when the removal, but the total number of GB used hardly moves!

What's going on? How can we recover our storage?

Internal shared storage screen 1

5th dnd – Could Oblex use spells coming from an unveiled wizard memory?

The old Oblex statistics block already shows what happens when it uses its Eat some memory aptitude.

When an oblex causes the exhaustion of the memory of a target, The oblex learns all the languages ‚Äč‚Äčthat the target knows and acquires all its skills, with the exception of backup skills.

he do not state that he is learning spells known or prepared by a caster, so this is not the case.

memory – the website is really slow … RAM and CPU seem OK

If I'm not in the right place to ask this kind of question, please point me in the right direction, I would appreciate it a lot!

I'm hosting a Drupal website on a VPS. Here are the specifications:

The VPS trade name is E3-SSD-2-32 – E3-1225v2 – 32 GB – SoftRaid SSD 3×120 GB. I am not an expert, but here's what I get: 32GB of RAM, that's a lot. And the hard drive is an SSD hard drive, meant to mean fast read and write. Plus, I think it has 3 processor cores, but as I said, I'm crap in hardware …

According to Google Analytics: The website has about 50,000 daily users and between 300 and 500 users navigate at any time.

At certain times of the day (around lunchtime), the server's response time is incredibly slow (up to 20 seconds to display a page), and sometimes the connection times out and Chrome displays the gray error page.

-> Apache2 MaxRequestWorkers

I used Apache2Buddy to help me adjust Apache2 MaxRequestWorkers.

Here is the complete output of Apache2Buddy: https://pastebin.com/PQKrrcCz

Here is my current /etc/apache2/mods-enabled/mpm_prefork.conf:


        StartServers             5
        MinSpareServers          5
        MaxSpareServers          10
        ServerLimit              1300
        MaxRequestWorkers        1300
        MaxClients               1300
        MaxConnectionsPerChild   0

-> Caching

I've also enabled caching in Drupal to reduce Mysql's load.

-> htop

Here is the output of htop taken when the website was slow: https://imgur.com/a/gObNfyP

According to htop, the memory usage is 2.75 GB and the processors only use 4%.

What I do not understand, is that Apache2Buddy tells me that Apache uses about 9 GB of RAM while htop indicates that the total use of RAM is 2.75 GB .

When I restart apache with apachectl restart the website starts working normally … until the next crisis …

Seriously, I'm starting to lose hope here, so any help would be much appreciated …..

Amazon Web Services – Application Node / React Ready for Production – Problems with Memory Usage

I have an application deployed on AWS with the help of ECS and recently faced with problems in memory usage.

To give you some context:

  1. Our application is Node.js (especially Sails.js) backend with React used for the front end
  2. In the ECS task definition, we set the memory to 900 CPUs and 600 CPUs, respectively.
  3. The instance type is t2.micro
  4. The AMI used is optimized for Amazon ECS (seems to use Docker Docker version 18.06.1-this)
  5. We have a service (not separate for frontend / backend) running by container (per instance EC2)
  6. Have at least 2 instances running ALB between
  7. We use DynamoDB and ElastiCache (Redis)

According to Cloudwatch journals, the memory usage oscillates between about 50 and 60%.

Operation process.memoryUsage () on one of the instances produces the following:

{ rss: 28999680,
  heapTotal: 7684096,
  heapUsed: 4982976,
  external: 16837 }

Is this normal for a Node / React production application?

Should we change the type of instance and increase the resources?

Does Docker also use additional resources that we need to account for?

Any idea or recommendation would be greatly appreciated.

high usage of swap memory | Talk Web Hosting

It's almost as if we needed to know how much RAM you actually have before someone can give you something like a real answer.

If you have 8 GB of RAM, the use of swap should not occur for an extended period.

However, if you have 512 MB of RAM, you will not do anything But swap to make your swap use "normal".

So… ?

Dad? How was vi born?
Well son, first cat and echo to fall in love…

Magento2: How to Resolve a Memory Limit Error When Using the Composer Update Command

enter the description of the image here

I came out of a memory error by running the "compose update" command,
I already check memory_limit and that is 2048 M that I also get the error above
.
does anyone know how can I solve this problem?

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