User`s guide

6 Programming Overview
6-52
Troubleshooting and Debugging
In this section...
“Object Data Size Limitations” on page 6-52
“File Access and Permissions” on page 6-52
“No Results or Failed Job” on page 6-54
“Connection Problems Between the Client and MJS” on page 6-54
“SFTP Error: Received Message Too Long” on page 6-55
Object Data Size Limitations
The size limit of data transfers among the parallel computing objects is limited by the
Java Virtual Machine (JVM) memory allocation. This limit applies to single transfers of
data between client and workers in any job using an MJS cluster. The approximate size
limitation depends on your system architecture:
System Architecture Maximum Data Size Per Transfer (approx.)
64-bit 2.0 GB
32-bit 600 MB
File Access and Permissions
Ensuring That Workers on Windows Operating Systems Can Access Files
By default, a worker on a Windows operating system is installed as a service running as
LocalSystem, so it does not have access to mapped network drives.
Often a network is configured to not allow services running as LocalSystem to access
UNC or mapped network shares. In this case, you must run the mdce service under a
different user with rights to log on as a service. See the section “Set the User” in the
MATLAB Distributed Computing Server System Administrator's Guide.
Task Function Is Unavailable
If a worker cannot find the task function, it returns the error message