更新时间:2022-09-28 13:08:54
redis属于单进程的服务,它主要受内存、CPU、磁盘IO(主要是做持久化),如果服务器配置比较高,多核CPU、高内存的服务器,可以考虑做redis多实例。做多实例之前,首先要考虑CPU和内存的利用,我在测试的时候发现,redis在QPS为6-8W左右的时候,这个redis所在的逻辑CPU核的负载就在100%左右,所以要优化CPU使用这块,目前一般是是做网卡软中断来实现平衡这种单进程使用CPU过高的情况,不过需要网卡支持网卡软中断,效果不错。
多实例redis的管理,涉及到监控、服务的管理等,这里只说redis多实例的重启。以下是多实例的重启脚本,仅供交流参考:
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#!/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检测一次redis ping,持续一分钟,1分钟没有起来认为启动失败
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()
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