kokizzu

// Simple groupcache example: https://github.com/golang/groupcache
// Running 3 instances:
// go run groupcache.go -addr=:8080 -pool=http://127.0.0.1:8080,http://127.0.0.1:8081,http://127.0.0.1:8082
// go run groupcache.go -addr=:8081 -pool=http://127.0.0.1:8081,http://127.0.0.1:8080,http://127.0.0.1:8082
// go run groupcache.go -addr=:8082 -pool=http://127.0.0.1:8082,http://127.0.0.1:8080,http://127.0.0.1:8081
// Testing:
// curl localhost:8080/color?name=red
package main

import (

kokizzu

Load tests

Injector

wrk is the binary used as injector, always used with these options:

./wrk -t12 -c1000 -d15s http://127.0.0.1:8080/

Results

kokizzu

removing p_scylla-node1_1
Recreating a7c6d49b49fc_p_scylla-node1_1 ... done
Attaching to p_scylla-node1_1
scylla-node1_1  | running: (['/opt/scylladb/scripts/scylla_dev_mode_setup', '--developer-mode', '1'],)
scylla-node1_1  | running: (['/opt/scylladb/scripts/scylla_io_setup'],)
scylla-node1_1  | 2022-03-21 07:12:32,184 CRIT Supervisor is running as root.  Privileges were not dropped because no user is specified in the config file.  If you intend to run as root, you can set user=root in the config file to avoid this message.
scylla-node1_1  | 2022-03-21 07:12:32,184 INFO Included extra file "/etc/supervisord.conf.d/rsyslog.conf" during parsing
scylla-node1_1  | 2022-03-21 07:12:32,184 INFO Included extra file "/etc/supervisord.conf.d/scylla-housekeeping.conf" during parsing
scylla-node1_1  | 2022-03-21 07:12:32,184 INFO Included extra file "/etc/supervisord.conf.d/scylla-jmx.conf" during parsing
scylla-node1_1  | 2022-03-21 07:12:32,184 INFO Included extra file "/etc/supervisord.conf.d/scylla-node-exporter.c

kokizzu

kokizzu

#include "stdio.h"


int InBlock[81], InRow[81], InCol[81];

const int BLANK = 0;
const int ONES = 0x3fe; 	// Binary 1111111110

int Entry[81];	// Records entries 1-9 in the grid, as the corresponding bit set to 1
int Block[9], Row[9], Col[9];	// Each int is a 9-bit array

kokizzu

How to setup a practically free CDN

I've been using [Backblaze][bbz] for a while now as my online backup service. I have used a few others in the past. None were particularly satisfactory until Backblaze came along.

It was - still is - keenly priced at a flat $5 (£4) per month for unlimited backup (I've currently got just under half a terabyte backed-up). It has a fast, reliable client. The company itself is [transparent about their operations][trans] and [generous with their knowledge sharing][blog]. To me, this says they understand their customers well. I've never had reliability problems and everything about the outfit exudes a sense of simple, quick, solid quality. The service has even saved the day on a couple of occasions where I've lost files.

Safe to say, I'm a happy customer. If you're not already using Backblaze, [I highly recommend you do][recommend].

Taking on the big boys with B2

kokizzu

package main

import (
	"context"
	"flag"
	"fmt"
	"io"
	"net"
	"net/http"
	"os"

kokizzu

Golang Benchmark: uuid(v4) vs cuid vs nanoid

Comparing these libraries

• github.com/google/uuid
• github.com/lucsky/cuid
• github.com/matoous/go-nanoid

result

kokizzu

package main

import (
	"encoding/xml"
	"flag"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"os"

kokizzu

package main

import (
	"fmt"
	"log"
	"strconv"

	"github.com/miekg/dns"
)