The default Go implementation of
sync.RWMutex does not scale well
to multiple cores, as all readers contend on the same memory location
when they all try to atomically increment it. This gist explores an
n
-way RWMutex, also known as a "big reader" lock, which gives each
CPU core its own RWMutex. Readers take only a read lock local to their
core, whereas writers must take all locks in order.
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package main | |
import( | |
"fmt" | |
"runtime" | |
"io/ioutil" | |
"bytes" | |
"strings" | |
) |
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package redis | |
import ( | |
"fmt" | |
"github.com/garyburd/redigo/redis" | |
) | |
// Batch represents a set of batched results, either a transaction or just send/receive. | |
// |
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package main | |
import( | |
"fmt" | |
"time" | |
"github.com/EverythingMe/go-disque/disque" | |
"github.com/garyburd/redigo/redis" | |
) |
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package main | |
import ( | |
"fmt" | |
"github.com/EverythingMe/inbloom/go/inbloom" | |
"net/http" | |
) | |
var vocabulary = []string{"foo", "bar", "baz", "hey", "yo", "go"} |
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package foo | |
import ( | |
"testing" | |
) | |
type Foo struct { | |
a string | |
b int | |
c float32 |
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import subprocess | |
import time | |
import sys | |
def parent(): | |
p = subprocess.Popen(['python', './testp.py', '--child'], stdin=subprocess.PIPE, stdout=subprocess.PIPE) |
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// A serializer prototype - you serialize by calling Write N times. | |
// the key type is determined on registration so not needed here | |
// the list size will be determined by redis when you exit, based on the number of times you called write() | |
int (*Serialize)(RedisModuleCtx *ctx, RedisModuleObjectWriter *out, RedisModuleKey *k) | |
// you deserialize by calling Read and reading one object at a time. | |
// numElements is passed so the user can preallocate stuff in advance | |
int (*Deserialize)(RedisModuleCtx *ctx, RedisModuleObjectReader *in, RedisModuleString *keyName, size_t numElements) |
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{ | |
"version": "0.1.0", | |
"isShellCommand": true, | |
"showOutput": "always", | |
"command": "go", | |
"echoCommand": true , | |
"options": { | |
"cwd": "${fileDirname}" | |
}, | |
"tasks": [ |
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# creating an index: | |
127.0.0.1:6379> IDX.CREATE users TYPE HASH SCHEMA name STRING age INT32 | |
OK | |
# running HASH commands while indexing them: | |
127.0.0.1:6379> IDX.INTO users HMSET user1 name "alice" age 24 | |
OK | |
127.0.0.1:6379> IDX.INTO users HMSET user2 name "bob" age 19 |
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