Babak Farrokhi farrokhi

## curl-web-perf.md

      
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                farrokhi
                / curl-web-perf.md
            
            
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              December 22, 2020 07:25
            
              
                Poor man's Connection and Transfer speed measurement using curl
              
          
    Save this as curl-perf.cfg:
{\n
"time_connect":       %{time_connect},\n
"time_pretransfer":   %{time_pretransfer},\n
"time_starttransfer": %{time_starttransfer},\n
"time_total":         %{time_total},\n
"size_request":       %{size_request},\n
"size_upload":        %{size_upload},\n
"size_download": %{size_download},\n


## disable_dsstore.sh
#!/bin/sh
defaults write com.apple.desktopservices DSDontWriteUSBStores -bool true
defaults write com.apple.desktopservices DSDontWriteNetworkStores -bool true
defaults read com.apple.desktopservices

## go-build.md

      
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                farrokhi
                / go-build.md
            
            
              Created
              January 20, 2020 13:03
            
              
                Building go
              
          
    Omitting debug symbols

To build without debug symbols:
go build -ldflags="-s -w"
ref: https://golang.org/cmd/link/

  
## mem_swap_linux.md

      
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                farrokhi
                / mem_swap_linux.md
            
            
              Created
              January 19, 2020 11:19
            
              
                memory usage and swap investigation in linux
              
          
    grep -A1 Normal  /proc/zoneinfo  ; echo "--"; sysctl vm.min_free_kbytes ; echo "--"; numactl -H | grep free


## freebsd-ntpd.md

      
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                farrokhi
                / freebsd-ntpd.md
            
            
              Created
              January 19, 2020 11:18
            
              
                Bind FreeBSD ntpd to given IP address
              
          
    In order to avoid FreeBSD ntpd listen on wildcard interface,
add following lines to /etc/ntp.conf:
interface ignore wildcard
interface listen 10.0.0.1


## cscope.md

      
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                farrokhi
                / cscope.md
            
            
              Created
              January 19, 2020 11:17
            
              
                Setting up cscope for a (large) C project
              
          
    build/update database:
cd $PROJ_DIR
find . -path .git -path .svn -prune -o -name "*.[ch]" > cscope.files
cscope -bqk

browse code:
cscope -d


## cpu-mem-online.sh
#!/bin/bash
# Based on script by William Lam - http://engineering.ucsb.edu/~duonglt/vmware/

# Bring CPUs online
for CPU_DIR in /sys/devices/system/cpu/cpu[0-9]*
do
    CPU=${CPU_DIR##*/}
    echo "Found cpu: '${CPU_DIR}' ..."
    CPU_STATE_FILE="${CPU_DIR}/online"
    if [ -f "${CPU_STATE_FILE}" ]; then

## ensure-ssh-agent.sh
AGENT_SCRIPT=${HOME}/load-agent.sh

while true; do
    [ -r ${AGENT_SCRIPT} ] && source ${AGENT_SCRIPT}
    if [ -n "$SSH_AGENT_PID" ]; then
        # ensure the variable actually reflects a running ssh-agent process
        ps -p $SSH_AGENT_PID | grep -q ssh-agent$ && break
    fi
    # SSH_AGENT_PID is either not set or has stale PID
    echo "Running ssh-agent"

## cleanup_memory.sh
#!/bin/sh
set -u

NUMA_BEFORE=`numactl -H | grep free:`
SLAB_BEFORE=`grep Normal /proc/buddyinfo`

printf "Dropping page cache..."
sysctl -qw vm.drop_caches=1
echo

## hugepages_settings.sh
#!/bin/bash
#
# hugepages_settings.sh
#
# Linux bash script to compute values for the
# recommended HugePages/HugeTLB configuration
#
# Note: This script does calculation for all shared memory
# segments available when the script is run, no matter it
# is an Oracle RDBMS shared memory segment or not.
	#!/bin/sh
	defaults write com.apple.desktopservices DSDontWriteUSBStores -bool true
	defaults write com.apple.desktopservices DSDontWriteNetworkStores -bool true
	defaults read com.apple.desktopservices
	#!/bin/bash
	# Based on script by William Lam - http://engineering.ucsb.edu/~duonglt/vmware/

	# Bring CPUs online
	for CPU_DIR in /sys/devices/system/cpu/cpu[0-9]*
	do
	CPU=${CPU_DIR##*/}
	echo "Found cpu: '${CPU_DIR}' ..."
	CPU_STATE_FILE="${CPU_DIR}/online"
	if [ -f "${CPU_STATE_FILE}" ]; then
	AGENT_SCRIPT=${HOME}/load-agent.sh

	while true; do
	[ -r ${AGENT_SCRIPT} ] && source ${AGENT_SCRIPT}
	if [ -n "$SSH_AGENT_PID" ]; then
	# ensure the variable actually reflects a running ssh-agent process
	ps -p $SSH_AGENT_PID \| grep -q ssh-agent$ && break
	fi
	# SSH_AGENT_PID is either not set or has stale PID
	echo "Running ssh-agent"
	#!/bin/sh
	set -u

	NUMA_BEFORE=`numactl -H \| grep free:`
	SLAB_BEFORE=`grep Normal /proc/buddyinfo`

	printf "Dropping page cache..."
	sysctl -qw vm.drop_caches=1
	echo
	#!/bin/bash
	#
	# hugepages_settings.sh
	#
	# Linux bash script to compute values for the
	# recommended HugePages/HugeTLB configuration
	#
	# Note: This script does calculation for all shared memory
	# segments available when the script is run, no matter it
	# is an Oracle RDBMS shared memory segment or not.