11-02-2017
Quote:
Originally Posted by
arunkumar_mca
Even with that I am seeing the first parallel process is taking less time and the process time increase with the split going on
Once you've maxed out your I/O bandwidth, adding more processes will just make a task slower. How many processes it takes to max out your I/O bandwidth could well be "one". Spinning disks especially lose a lot of bandwidth when split between competing tasks.
Beyond that, it's difficult to say what's happening. We still don't know what you're doing. "Processing" is a fine word but tells us little.
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT SUSE
usb_set_interface
USB_SET_INTERFACE(9) USB Core APIs USB_SET_INTERFACE(9)
NAME
usb_set_interface - Makes a particular alternate setting be current
SYNOPSIS
int usb_set_interface(struct usb_device * dev, int interface, int alternate);
ARGUMENTS
dev
the device whose interface is being updated
interface
the interface being updated
alternate
the setting being chosen.
CONTEXT
!in_interrupt ()
DESCRIPTION
This is used to enable data transfers on interfaces that may not be enabled by default. Not all devices support such configurability. Only
the driver bound to an interface may change its setting.
Within any given configuration, each interface may have several alternative settings. These are often used to control levels of bandwidth
consumption. For example, the default setting for a high speed interrupt endpoint may not send more than 64 bytes per microframe, while
interrupt transfers of up to 3KBytes per microframe are legal. Also, isochronous endpoints may never be part of an interface's default
setting. To access such bandwidth, alternate interface settings must be made current.
Note that in the Linux USB subsystem, bandwidth associated with an endpoint in a given alternate setting is not reserved until an URB is
submitted that needs that bandwidth. Some other operating systems allocate bandwidth early, when a configuration is chosen.
This call is synchronous, and may not be used in an interrupt context. Also, drivers must not change altsettings while urbs are scheduled
for endpoints in that interface; all such urbs must first be completed (perhaps forced by unlinking).
Returns zero on success, or else the status code returned by the underlying usb_control_msg call.
COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 USB_SET_INTERFACE(9)