Sergey Cheperis sergey-cheperis

## vpn-ip-list.txt
ipinfo.io

## khugepaged-lockup.md

      
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                sergey-cheperis
                / khugepaged-lockup.md
            
            
              Created
              December 10, 2021 11:57
            
              
                Resolve khugepagesd 100% CPU usage or soft lockup
              
          
      View khugepaged-lockup.md
  
      
    Issue
When running calculations with high rate of memory allocation, khugepaged can use 100% CPU or even cause CPU lockup messages in the kernel log:
INFO: task khugepaged:212 blocked for more than 120 seconds.

Solution
Disable transparent huge pages.

  
## kvm-hugepages.md

      
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                sergey-cheperis
                / kvm-hugepages.md
            
            
              Last active
              January 7, 2022 17:20
            
              
                Resolve slow startup of a KVM guest with 480 GiB RAM by preallocating huge pages
              
          
      View kvm-hugepages.md
  
      
    Issue
A guest with 480 GiB RAM on a 512 GiB machine is taking several minutes to start because memory pre-allocation is not fast enough (approx. 2 GiB/sec).
Solution
The solution is to have the necessary amount of RAM preallocated in the huge page pool, and to make QEMU/KVM use the pool for the guest.

Check which page size is supported by the platform:


## proxmox7.1-ast25000-issue.md

      
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                sergey-cheperis
                / proxmox7.1-ast25000-issue.md
            
            
              Last active
              April 15, 2023 04:53
            
              
                Resolve Proxmox 7.1 "installation aborted" on SuperMicro with AST 2500
              
          
      View proxmox7.1-ast25000-issue.md
  
      
    Issue
On SuperMicro AS-4124GS-TNR server with ASPEED AST2500 BMC, Proxmox 7.1 installation does not start with "installation aborted" message.
Details
After setting up DHCP and Chrony, Proxmox fails to start the graphical installer and drops into the shell:
...
Starting Chrony for opportunistic time-sync... Starting a root shell on tty3.


## Makefile
PREFIX=/usr/local
PROGRAM=<CHANGEME>

.PHONY: build clean install uninstall

bin/$(PROGRAM): src/*.go
	go build -o bin/$(PROGRAM) src/*.go

build: bin/$(PROGRAM)

## pin-nvidia.sh
#!/bin/bash

# This script "pins" currently installed nvidia driver to prevent it from auto-updating and breaking running vast.ai services.
# It creates the file /etc/apt/preferences.d/nvidia-manual-pin.
#
# From time to time, you'll still need to update the driver manually. Only do this while no vast.ai jobs are running
# (except your default jobs). Follow these steps:
#
# 1. Stop vast.ai and related things: `systemctl stop vastai docker cron`
# 2. Remove the pin: `rm -f /etc/apt/preferences.d/nvidia-manual-pin`

## gist:3a3dd650bcbd6b73ec49f7d781a83287
NSLog(@"UIFontWeightUltraLight = %@", @(UIFontWeightUltraLight));
NSLog(@"UIFontWeightThin = %@", @(UIFontWeightThin));
NSLog(@"UIFontWeightLight = %@", @(UIFontWeightLight));
NSLog(@"UIFontWeightRegular = %@", @(UIFontWeightRegular));
NSLog(@"UIFontWeightMedium = %@", @(UIFontWeightMedium));
NSLog(@"UIFontWeightSemibold = %@", @(UIFontWeightSemibold));
NSLog(@"UIFontWeightBold = %@", @(UIFontWeightBold));
NSLog(@"UIFontWeightHeavy = %@", @(UIFontWeightHeavy));
NSLog(@"UIFontWeightBlack = %@", @(UIFontWeightBlack));

## RNfontWeights.js
{ fontWeight: '100' }, // Thin
{ fontWeight: '200' }, // Ultra Light
{ fontWeight: '300' }, // Light
{ fontWeight: '400' }, // Regular
{ fontWeight: '500' }, // Medium
{ fontWeight: '600' }, // Semibold
{ fontWeight: '700' }, // Bold
{ fontWeight: '800' }, // Heavy
{ fontWeight: '900' }, // Black

## firefox-decrypt.cpp
// Example program to decrypt passwords saved by Firefox for Windows.
//
// Uses NSS libraries: https://github.com/sergey-cheperis/nss-nspr-windows
// Uses JSON library: https://github.com/nlohmann/json
//
// Compile with MSVC:
//     cl /I<path-to-nss>\include /EHsc firefox-decrypt.cpp /link /LIBPATH:<path-to-nss>\release\x64\lib
//
// NSS DLL's should be put to the .exe directory or to a directory in your PATH
//

## keybase.md

      
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                sergey-cheperis
                / keybase.md
            
            
              Created
              August 15, 2017 16:59
            
          
      View keybase.md
  
      
    Keybase proof
I hereby claim:

I am sergey-cheperis on github.
I am czz (https://keybase.io/czz) on keybase.
I have a public key ASBD0ul_mi546i4ImIIoacpyzVmfSknyC0QY-UzsPhcjLQo

To claim this, I am signing this object:
	PREFIX=/usr/local
	PROGRAM=<CHANGEME>

	.PHONY: build clean install uninstall

	bin/$(PROGRAM): src/*.go
	go build -o bin/$(PROGRAM) src/*.go

	build: bin/$(PROGRAM)
	#!/bin/bash

	# This script "pins" currently installed nvidia driver to prevent it from auto-updating and breaking running vast.ai services.
	# It creates the file /etc/apt/preferences.d/nvidia-manual-pin.
	#
	# From time to time, you'll still need to update the driver manually. Only do this while no vast.ai jobs are running
	# (except your default jobs). Follow these steps:
	#
	# 1. Stop vast.ai and related things: `systemctl stop vastai docker cron`
	# 2. Remove the pin: `rm -f /etc/apt/preferences.d/nvidia-manual-pin`
	NSLog(@"UIFontWeightUltraLight = %@", @(UIFontWeightUltraLight));
	NSLog(@"UIFontWeightThin = %@", @(UIFontWeightThin));
	NSLog(@"UIFontWeightLight = %@", @(UIFontWeightLight));
	NSLog(@"UIFontWeightRegular = %@", @(UIFontWeightRegular));
	NSLog(@"UIFontWeightMedium = %@", @(UIFontWeightMedium));
	NSLog(@"UIFontWeightSemibold = %@", @(UIFontWeightSemibold));
	NSLog(@"UIFontWeightBold = %@", @(UIFontWeightBold));
	NSLog(@"UIFontWeightHeavy = %@", @(UIFontWeightHeavy));
	NSLog(@"UIFontWeightBlack = %@", @(UIFontWeightBlack));
	{ fontWeight: '100' }, // Thin
	{ fontWeight: '200' }, // Ultra Light
	{ fontWeight: '300' }, // Light
	{ fontWeight: '400' }, // Regular
	{ fontWeight: '500' }, // Medium
	{ fontWeight: '600' }, // Semibold
	{ fontWeight: '700' }, // Bold
	{ fontWeight: '800' }, // Heavy
	{ fontWeight: '900' }, // Black
	// Example program to decrypt passwords saved by Firefox for Windows.
	//
	// Uses NSS libraries: https://github.com/sergey-cheperis/nss-nspr-windows
	// Uses JSON library: https://github.com/nlohmann/json
	//
	// Compile with MSVC:
	// cl /I<path-to-nss>\include /EHsc firefox-decrypt.cpp /link /LIBPATH:<path-to-nss>\release\x64\lib
	//
	// NSS DLL's should be put to the .exe directory or to a directory in your PATH
	//