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nfsiod(8) [osx man page]

NFSIOD(8)						    BSD System Manager's Manual 						 NFSIOD(8)

nfsiod -- local NFS asynchronous I/O SYNOPSIS
nfsiod [-n num_threads] DESCRIPTION
nfsiod is deprecated. See nfs.conf(5) for NFS configuration info. nfsiod controls the maximum number of asynchronous I/O threads used for NFS mounts. Historically, it has consisted of a daemon that never exits. However, asynchronous I/O requests are now serviced by threads launched on demand in the kernel and the nfsiod command simply sets the configuration limit. Having asynchronous I/O threads improves performance but is not required for correct operation. The options are as follows: -n Specify maximum number of asynchronous I/O threads to be used. If no maximum is specified, nfsiod displays the current value. The default value is 16. A client should allow enough threads to handle its maximum level of concurrency. The nfsiod utility exits 0 on success, and >0 if an error occurs. SEE ALSO
nfs.conf(5), mount_nfs(8), nfsstat(1) HISTORY
The nfsiod utility first appeared in 4.4BSD. It's use was deprecated in Darwin 9. BSD
October 25, 2006 BSD

Check Out this Related Man Page

async_daemon(2) 						System Calls Manual						   async_daemon(2)

async_daemon - Creates a local NFS asynchronous I/O server SYNOPSIS
async_daemon( unsigned long iod_num, unsigned long magic); PARAMETERS
Specifies the number of I/O threads to run. For Tru64 UNIX, this is 950410. If a different value is used, seven NFS I/O threads are run. DESCRIPTION
The use of the async_daemon() function is not supported in customer applications, and the interface is subject to change without notice. It is intended for use solely by nfsiod(8). The async_daemon() function starts iod_num NFS I/O kernel threads that are used to improve NFS I/O performance. This function does not return to the caller, but remains in the kernel to provide additional support for NFS over TCP. RETURN VALUES
The async_daemon function has no successful return. In fact, it frees the text and data segments associated with the calling program so there is nothing to return to. When interrupted by a KILL signal, the I/O threads are terminated and the process exits. If the async_dae- mon function encounters errors, , -1 is returned and errno is set to indicate the error. ERRORS
If the async_daemon() function fails, errno may be set to the following value: The async_daemon function has already been called by another process. The caller is not the superuser. More than 64 I/O threads were requested. The kernel memory allocator has no memory. RELATED INFORMATION
Functions: nfssvc(2) Commands: nfsiod(8) delim off async_daemon(2)
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