n is an integer in the range 512—8192 (bytes). InterSystems recommends you use the default of 512.
ijcbuff is the number of bytes allocated for each InterJob Communication (IJC) buffer. For details, see the “Interprocess Communication” chapter in the I/O Device Guide. Also see the parameter ijcnum.
Changing This Parameter
On the Advanced Memory page of the Management Portal (System Administration > Configuration > Additional Settings > Advanced Memory), in the ijcbuff row, select Edit. Enter a number of bytes.
Instead of using the Management Portal, you can change ijcbuff in the Config.config class (as described in the class reference) or by editing the CPF in a text editor (as described in the Editing the Active CPF section of the “Introduction to the Configuration Parameter File” chapter in this book).
If you edit this setting, you must restart InterSystems IRIS® data platform to apply the change.