How is readiness of instructions fetched from RAM signaled to the CPU?

In simple CPU architectures, such as the one discussed here, an instruction loaded from RAM is executed exactly one clock cycle after it is loaded into the instruction register.

However, I am told that in real/modern architectures it takes hundreds of clock cycles to fetch instructions from RAM (using caches in between). But that completely throws off my understanding of how things work. Could someone please outline the techniques that enable instructions ordered from RAM to get executed after some indefinite number of clock cycles in the future?

Please don’t just say e.g. "by stalling", but actually outline in terms of signals, chips, etc. how these things are organized. Thanks!

Extension Installation Readiness Check Error Magento 2.3.1

There are several errors when I’m trying to install an extension (Slider Banner Module) for the first time. The picture below shows the error in the readiness check. I’m using GoDaddy > C-Panel > Magento 2.3.1 on Windows 10 with PHP version 7.2

Readiness Check Failure 1) For the Check Cron Scripts errors, I am able to solve it by manually change

$ setupCheck = $ this->cronScriptReadinessCheck->checkSetup();

$ updaterCheck = $ this->cronScriptReadinessCheck->checkUpdater();


$ setupCheck = ['success' => 1];

$ updaterCheck = ['success' => 1];

I’m not sure if that is the correct way to fix it since there are no .setup_cronjob_status and .update_cronjob_status files in var.

2) For the Dependency error, I have tried to remove "require-dev": in composer.json file but the error still persist.

3) For the PHP Settings Check error, I tried to change the memory limit in .user.ini and .htaccess from memory_limit = 756M to memory_limit = 2G, however, the C-Panel > PHP Selector > Options > Memory_limit still stays at 756M. PHP Memory Limit

4) PHP Extensions Checks is as the picture below (Default Value) PHP Extensions

Question about ” Touchscreen Readiness”


When I analyzed my website on woorank, I noticed a part " Touchscreen Readiness".
But I dont know how to fix this part!


Make the most important buttons/links large enough to be tapped easily.
Touchscreen readiness is an important aspect of your site’s mobile friendliness.

Currently, the tap targets on are too small for touchscreen users. They should be at least a 48 pixels height and width with at least 32 pixels of extra space on all sides.

You can further improve your User Interface by adding size and density buckets to accommodate varying device sizes and screen densities.

If I change the sizes (48 px , 32px) it effect the veiw in desktop mod.
Is there any way to apply these changes to mobile devices?

Readiness Check Failure in Magento 2

I am getting the below error on updating a marketplace extension in backend (System->Websetup Wizard->Extension Manager).

Check Cron Scripts Cron script readiness check failed. Hide detail

Error from Setup Application Cron Script: Cron job has not been configured yet Other checks will fail as a result (PHP version, PHP settings, and PHP extensions)

Error from Updater Application Cron Script: Cron job has not been configured yet

For additional assistance, see cron scripts help.

Check Component Dependency We found conflicting component dependencies. Hide detail

Command “update” failed: Loading composer repositories with package information Updating dependencies (including require-dev) Your requirements could not be resolved to an installable set of packages.

Problem 1 – Installation request for dotmailer/dotmailer-magento2-extension 3.2.0 -> satisfiable by dotmailer/dotmailer-magento2-extension[3.2.0]. – dotmailer/dotmailer-magento2-extension 3.2.0 requires magento/framework >=100 <103 -> no matching package found.

Potential causes: – A typo in the package name – The package is not available in a stable-enough version according to your minimum-stability setting see for more details.

Read for further common problems.

For additional assistance, see component dependency help .

PHP Settings Check * For additional assistance, see PHP settings check help .

Need Help?

PHP Extension Help PHP Extensions Check missing PHP extensions. Hide detail

The best way to resolve this is to install the correct missing extensions. The exact fix depends on our server, your host, and other system variables. Our PHP extension help can get you started.

For additional assistance, contact your hosting provider.

How to Fix it?

Magento 2 – Readiness check fails on Check Component Dependency

I have Magento Community 2.2. installed on managed VPS (Hetzner). I am trying to install component and before installation it starts “Readiness check”. All checks out except for:

Check Component Dependency  We found conflicting component dependencies. Hide detail  For additional assistance, see component dependency help . 

I don’t get any details on error.


I have followed instructions from here:

  • I have run command for file permissions described here:
  • I have tried with removing files /var/.update_cronjob_status and /var/.setup_cronjob_status and regenerating them starting Module Manager (probably previously known as Component manager)

POSSIBLE CAUSE I was running installation of a module through composer and when asked for authorization (public and private keys) i have saved them in composer.json. Since this is one of possible reasons listed in their documentation (changing of composer.json) all it says is to “edit composer.json” but it doesn’t say how or what… I have opened composer.json but I didn’t find any keys there…

I appreciate help with this 🙂

Magento 2.3 Readiness Check Failing

Issue: Magento 2.3 Fresh install Web setup fails the following

PHP Settings Check * PHP Extensions Check Check Cron Scripts

How to reproduce Install new blank default install of magento 2.3 setup passes the readiness check. From admin go to system -> web setup wizard. Click on extensions, select anything to install. it takes you to the readiness check window and fails the above.

I have been stuck on this for three weeks. I just dont get it. It passes for the install but then failed when trying to install an extension.

I put a phpinfo file in both the root and the setup folder both are exactly the same.

Any help would be very much appreciated. I did not have this problem with the 2.2x version.

php version 7.1.25