How to check the memory allocator used by my mysql 5.7.20

Question

I am suspecting memory leak in my mysql 5.7.20 server as per below filed bug https://bugs.mysql.com/bug.php?id=83047

So i installed jemalloc in my centos 7 server and rebooted mysql(service mysqld restart). Now i wanted to check whether mysql has picked jemalloc as the mem allocator or not

I tried

pt-mysql-summary | grep -A5 -i "memory management"
Memory management library 
jemalloc is not enabled in mysql config for process with id 89539 The End 

where can i check that information in running mysql instance? Please help.. thanks in advance.

Answer 1

You can see which shared libaries mysqld has loaded with:

lsof -p $(pidof mysqld) | grep mem

If its using jemalloc it should be listed.