MySQL 5.7 vs 8.0,哪個(gè)性能更牛?
背景
測試mysql5.7和mysql8.0 分別在讀寫、只讀、只寫模式下不同并發(fā)時(shí)的性能(tps,qps)
前提
- 測試使用版本為mysql5.7.22和mysql8.0.15
 - sysbench測試前先重啟mysql服務(wù),并清空os的cache(避免多次測試時(shí)命中緩存)
 - 每次進(jìn)行測試都是新生成測試數(shù)據(jù)后再進(jìn)行mysql5.7和mysql8.0的測試
 - 每次測試時(shí)保證mysql5.7和mysql8.0的配置參數(shù)一致
 
環(huán)境
機(jī)器
- cat /etc/redhat-release | xargs echo '版本 ' && dmidecode -s system-product-name | xargs echo '是否虛擬化 ' && cat /proc/cpuinfo |grep "processor"|wc -l | xargs echo 'cpu核數(shù) '
 - 版本 CentOS Linux release 7.5.1804 (Core)
 - 是否虛擬化 KVM
 - cpu核數(shù) 4
 
myql5.7.22
- 5.7.22-log
 - innodb_buffer_pool_size 128M
 - innodb_log_buffer_size 64M
 - innodb_log_file_size 48M
 - binlog_format ROW
 - log_bin ON
 - transaction_isolation REPEATABLE-READ
 
mysql8.0.15
- 8.0.15
 - innodb_buffer_pool_size 128M
 - innodb_log_buffer_size 64M
 - innodb_log_file_size 48M
 - binlog_format ROW
 - log_bin ON
 - transaction_isolation REPEATABLE-READ
 
sysbench
- sysbench -V
 - sysbench 1.1.0 (using bundled LuaJIT 2.1.0-beta3)
 
測試
- 在不同的持久化策略下(binlog, redo log持久化)mysql5.7和mysql8.0 在讀寫模式、只讀模式、只寫模式(oltp_read_write,oltp_read_only,oltp_write_only)下的性能表現(xiàn)
 - sysbench 測試時(shí)間為60s,測試的表數(shù)量為20
 - 測試分別在雙1模式(安全性)和0 2模式(高性能)下進(jìn)行
 
雙1模式下
- SHOW GLOBAL VARIABLES WHERE Variable_name IN('sync_binlog','innodb_flush_log_at_trx_commit');
 - +--------------------------------+-------+
 - | Variable_name | Value |
 - +--------------------------------+-------+
 - | innodb_flush_log_at_trx_commit | 1 |
 - | sync_binlog | 1 |
 - +--------------------------------+-------+
 
mysql5.7和mysql8.0 在讀寫模式下的表現(xiàn)
- 雙1 配置,讀寫模式下,mysql5.7.22 和mysql8.0.15 tps 、qps 性能差不多,mysql8.0.15 在120 線程并發(fā)時(shí),性能出現(xiàn)了下降抖動(dòng):
 
mysql5.7和mysql8.0 在只讀模式下的表現(xiàn)
- 雙1 配置,只讀模式下,mysql5.7.22 的tps、qps比mysql8.0.15 好1/3 左右;并發(fā)線程數(shù)增加后,tps、qps并沒有隨著增加,反而出現(xiàn)了下降的趨勢。
 
mysql5.7和mysql8.0 在只寫模式下的表現(xiàn)
- 雙1 配置,只寫模式下,隨著并發(fā)數(shù)的上升,mysql5.7.22 的性能比mysql8.0.15 好1/4左右。
 
0 2 模式下
- SHOW GLOBAL VARIABLES WHERE Variable_name IN('sync_binlog','innodb_flush_log_at_trx_commit');
 - +--------------------------------+-------+
 - | Variable_name | Value |
 - +--------------------------------+-------+
 - | innodb_flush_log_at_trx_commit | 2 |
 - | sync_binlog | 0 |
 - +--------------------------------+-------+
 
mysql5.7和mysql8.0 在讀寫模式下的表現(xiàn)
- 0 2配置,讀寫模式下,并發(fā)數(shù)低時(shí),mysql5.7.22性能好于mysql8.0.15; 并發(fā)數(shù)比較高時(shí),mysql8.0.15 性能好于mysql5.7.22;在80 線程的并發(fā)以上時(shí),性能開始下降。
 
mysql5.7和mysql8.0 在只讀模式下的表現(xiàn)
- 0 2配置,只讀模式下,mysql5.7.22性能比mysql8.0.15 好1/3左右;隨著并發(fā)數(shù)的上升,性能也沒有上升,反而有下降的趨勢.
 
mysql5.7和mysql8.0 在只寫模式下的表現(xiàn)
- 0 2 配置,只寫模式下,mysql5.7.22的tps 抖動(dòng)比較大;mysql5.7.22 的qps比mysql8.0.15好1/3左右
 
結(jié)論
- 整體來看,mysql5.7.22在讀寫模式、只讀模式、只寫模式下的表現(xiàn)是優(yōu)于mysql8.0.15的
 - 隨著并行數(shù)的增加,性能表現(xiàn)不會也跟著增加,還會出現(xiàn)下降
 - 本次測試結(jié)果是在配置很低的情況下進(jìn)行的,不代表絕對
 
注意
sysbench 需要設(shè)置--db-ps-mode=disable 禁用預(yù)編譯語句,不然并發(fā)測試線程多時(shí)會報(bào)下面的錯(cuò)誤
- FATAL: mysql_stmt_prepare() failed
 - FATAL: MySQL error: 1461 "Can't create more than max_prepared_stmt_count statements (current value: 16382)"
 - FATAL: mysql_stmt_prepare() failed
 - FATAL: MySQL error: 1461 "Can't create more than max_prepared_stmt_count statements (current value: 16382)"
 - FATAL: thread_init' function failed: /usr/local/share/sysbench/oltp_common.lua:288: SQL API error FATAL: mysql_stmt_prepare() failed FATAL: MySQL error: 1461 "Can't create more than max_prepared_stmt_count statements (current value: 16382)" FATAL:thread_init' function failed: /usr/local/share/sysbench/oltp_common.lua:288: SQL API error
 - FATAL: mysql_stmt_prepare() failed
 
使用腳本
- cat sysbench_test_mysql5.7_8.0_tps_qps.sh
 - #!/bin/bash
 - #用于sysbench 測試在讀寫模式、只讀模式、只寫模式下 mysql5.7和mysql8.0 的tps,qps
 - #nohup bash $0 >/tmp/sysbench_test 2>& 1 &
 - #
 - user=admin
 - passwd=admin
 - ports="8015 57222"
 - host=127.0.0.1
 - sysbench_test_mode="oltp_read_write oltp_read_only oltp_write_only"
 - sysbench_test_info_path=/tmp/sysbench-test
 - function red_echo () {
 - local what="$*"
 - echo -e "$(date +%F-%T) \e[1;31m ${what} \e[0m"
 - }
 - function check_las_comm(){
 - if [ $1 -ne 0 ];then
 - red_echo $2
 - exit 1
 - fi
 - }
 - function restart_mysqld(){
 - service mysqld${1} restart
 - sleep 2
 - }
 - function purge_binlog(){
 - port=$1
 - mysql -u$user -p$passwd -P$port -h$host<<EOF
 - purge binary logs before now();
 - EOF
 - }
 - function clean_os_cache(){
 - echo 3 > /proc/sys/vm/drop_caches
 - }
 - function sysbench_with_diff_thread(){
 - thread_num=$1
 - port=$2
 - order=$3
 - test_mode=$4
 - sysbench /usr/local/share/sysbench/${test_mode}.lua --mysql_storage_engine=innodb --table-size=100000 --tables=20 --mysql-db=test_1 --mysql-user=$user --mysql-password=$passwd --mysql-port=$port --mysql-host=$host --threads=$thread_num --time=60 --report-interval=2 --db-ps-mode=disable --events=0 --db-driver=mysql $order
 - }
 - function main(){
 - for test_mode in $sysbench_test_mode;do
 - for port in $ports;do
 - for thread_num in {5,10,20,30,40,80,120,200};do
 - restart_mysqld "$port"
 - check_las_comm "$?" "restart mysqld${port} failed "
 - clean_os_cache
 - purge_binlog "$port"
 - red_echo "sysbench $thread_num threads cleanup mysqld${port}"
 - sysbench_with_diff_thread "$thread_num" "$port" "cleanup" "$test_mode">/dev/null
 - red_echo "sysbench $thread_num threads prepare mysqld${port}"
 - sysbench_with_diff_thread "$thread_num" "$port" "prepare" "$test_mode">/dev/null
 - mkdir -p $sysbench_test_info_path
 - red_echo "sysbench $thread_num threads run mysqld${port} $test_mode"
 - sysbench_with_diff_thread "$thread_num" "$port" "run" "$test_mode" > $sysbench_test_info_path/${test_mode}_${thread_num}_$port
 - # service mysqld{port} stop
 - done
 - done
 - done
 - }
 - main
 
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