redis屬於單進程的服務,它主要受記憶體、CPU、磁碟IO(主要是做持久化),如果伺服器配置比較高,多核CPU、高記憶體的伺服器,可以考慮做redis多執行個體。做多執行個體之前,首先要考慮CPU和記憶體的利用,我在測試的時候發現,redis在QPS為6-8W左右的時候,這個redis所在的邏輯CPU核的負載就在100%左右,所以要最佳化CPU使用這塊,目前一般是是做網卡非強制中斷來實現平衡這種單進程使用CPU過高的情況,不過需要網卡支援網卡非強制中斷,效果不錯。
多執行個體redis的管理,涉及到監控、服務的管理等,這裡只說redis多執行個體的重啟。以下是多執行個體的重啟指令碼,僅供交流參考:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import redis,threading,sys,socket,time,os
from multiprocessing import Pool
def port_check(host,port):
POOL = redis.ConnectionPool(host=host, port=port)
my_server = redis.Redis(connection_pool=POOL)
try:
a = my_server.ping()
if a:
return 1
else:
return 0
except Exception,e:
return 0
def shutdown_server(host,port):
flag = port_check(host,port)
if flag == 1:
POOL = redis.ConnectionPool(host=host, port=port)
my_server = redis.Redis(connection_pool=POOL)
my_server.shutdown()
while 1:
flag = port_check(host,port)
if flag == 0:
print "%s:%s is Shutdown OK" % (host,port)
break
else:
time.sleep(1)
else:
print "%s:%s is Shutdown alreaday" % (host,port)
def start_server(host,port):
flag = port_check(host,port)
if flag == 0:
start_conm = "/usr/local/bin/redis-server /usr/local/redis/etc/redis_%s.conf" % port
os.popen(start_conm)
time.sleep(3)
i = 0
while 1:#每5s檢測一次redis ping,持續一分鐘,1分鐘沒有起來認為啟動失敗
flag = port_check(host,port)
if flag == 1:
print "%s:%s is Start OK" % (host,port)
break
else:
if i > 12:
print "%s:%s is Start Error" % (host,port)
break
else:
time.sleep(5)
i = i + 1
else:
print "%s:%s is Start alreaday" % (host,port)
def restart(host,port):
shutdown_server(host,port)
start_server(host,port)
def main():
server_list = ["127.0.0.1:6379","127.0.0.1:16379"]
pool = Pool(processes=3)
for i in server_list:
aa = i.split(':')
host = aa[0]
port = int(aa[1])
results = pool.apply_async(restart, (host,port))
pool.close()
pool.join()
if results.successful():
print 'successful'
if __name__=="__main__":
main()
Redis 的詳細介紹:請點這裡
Redis 的:請點這裡
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