Limit connections from client

[HUNGCUONG NGUYEN]

Hi Peter,

I use Open connection and Single Read (use existing connection) samplers for long running websockets to test my server. With Jmeter I can check the maximum websockets open successful is 256 and no more event I tried to open 1000 connections (I have checked by start the second Jmeter program with same .jmx file but no additional websocket is added at Server side). I check again with a java program in Eclipse the maximum websockets open successful is 676 and no more event I tried to open 1000 websocket connections. If I run same java program again the same number of websocket connections is created.

The results above I have checked with Mac OS High Sierra 10.13.4 and I have updated limit maxfiles to 524288 already. (With no update to limit maxfiles I got an error when I run the second time of java program in eclipse as "Too many open files") Could you please give me some advices for this issue.

Thank you in advance.

[HUNGCUONG NGUYEN]

I found the cause of my problems. With Jmeter I connected to Apache server so maxClients is limited by Apache. With java program I connected direct to Dropwizard app and kern.num_taskthreads of MacOS is reached so "out of memory can't create native threads" error is occurred.