/usr/lib/postgresql/12/bin/pg_upgrade \
--old-datadir=/var/lib/postgresql/10/main \
--new-datadir=/var/lib/postgresql/12/main \
--old-bindir=/usr/lib/postgresql/10/bin \
--new-bindir=/usr/lib/postgresql/12/bin \
--old-options '-c config_file=/etc/postgresql/10/main/postgresql.conf' \
--new-options '-c config_file=/etc/postgresql/12/main/postgresql.conf' \
--check
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// This is a basic uniswap frontrunning MEV bot | |
// Made by Merunas follow me on youtube to see how to use it and edit it: https://www.youtube.com/channel/UCJInIwgW1duAEnMHHxDK7XQ | |
// 1. Setup ethers, required variables, contracts and start function | |
const { Wallet, ethers } = require('ethers') | |
const { FlashbotsBundleProvider, FlashbotsBundleResolution } = require('@flashbots/ethers-provider-bundle') | |
// 1.1 Setup ABIs and Bytecodes | |
const UniswapAbi = [{"inputs":[{"internalType":"address","name":"_factory","type":"address"},{"internalType":"address","name":"_WETH","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"WETH","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"},{"internalType":"uint256","name":"amountADesired","type":"uint256"},{"internalType":"uint256","name":"amountBDesire |
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package main | |
import ( | |
"fmt" | |
"github.com/ethereum/go-ethereum/core/rawdb" | |
"github.com/ethereum/go-ethereum/core/types" | |
"github.com/ethereum/go-ethereum/core/state" | |
"github.com/ethereum/go-ethereum/rlp" | |
"github.com/ethereum/go-ethereum/trie" | |
_ "github.com/ethereum/go-ethereum/common" |
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Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
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SELECT table, | |
formatReadableSize(sum(bytes)) as size, | |
min(min_date) as min_date, | |
max(max_date) as max_date | |
FROM system.parts | |
WHERE active | |
GROUP BY table |
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/** | |
* @param string $range | |
* @return string | |
*/ | |
public static function cleanRange(string $range): string | |
{ | |
return preg_replace('/[^0-9\-,]/', '', $range); | |
} | |
/** |
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psql -U postgres -d name -h host.com -p 5432 -c "COPY (SELECT id, name FROM user LIMIT 10) TO STDOUT With CSV HEADER DELIMITER ',';" > foo_data.csv |
sudo docker run --detach \
--hostname gitlab.example.com \
--publish 8443:443 --publish 8080:80 --publish 2222:22 \
--name gitlab \
--restart always \
--volume /srv/gitlab/config:/etc/gitlab \
--volume /srv/gitlab/logs:/var/log/gitlab \
--volume /srv/gitlab/data:/var/opt/gitlab \
gitlab/gitlab-ce:latest
When setting these options consider the following:
- How long is your average request?
- What is the maximum number of simultaneous visitors the site(s) get?
- How much memory on average does each child process consume?
sudo grep max_children /var/log/php?.?-fpm.log.1 /var/log/php?.?-fpm.log
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session_start([ | |
'save_handler' => 'redis', | |
'save_path' => 'tcp://127.0.0.1:6379?database=1', | |
'cookie_lifetime' => 86400, | |
'gc_maxlifetime' => 86400, | |
'serialize_handler' => 'igbinary', | |
'name' => 'project', | |
'cookie_httponly' => true | |
]); |
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