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Full Discussion: Perl : Large amount of data put into an array
Top Forums Shell Programming and Scripting Perl : Large amount of data put into an array Post 302819311 by DGPickett on Monday 10th of June 2013 03:21:36 PM
Old 06-10-2013
The only thing faster than the scalar loop is to memory map the file in PERL so it is a big string in memory, and not by much, as many OS read flat files via mmap() (automatic buffering in RAM via VM using no swap).

It's a classic case of advanced tools doing expensive favors for you! But there is a base cost below which perl level code cannot go.

Compressing the file might speed the flow out a pipe, as CPUs are so much faster than disks. Old compress is faster than gzip -1. However, if it gets referenced on the same host often, it may be in RAM.
 

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LEARN ABOUT LINUX

usoc

usoc(7D)							      Devices								  usoc(7D)

NAME

       usoc - universal serial optical controller for Fibre Channel arbitrated loop (SOC+) device driver

DESCRIPTION

       The  Fibre  Channel adapter is an SBus card that implements two full duplex Fibre Channel interfaces. Each interface can connect to a Fibre
       Channel arbitrated loop (FC-AL). The usoc device driver is a nexus driver and implements portions of the FC-2 and FC-4 layers of FC-AL.

FILES

       /kernel/drv/usoc

	   32-bit ELF kernel module

       /kernel/drv/sparcv9/usoc

	   64-bit ELF kernel module

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |SPARC			   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Unknown			   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWusoc			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       fctl(7D), sbus(4), fcp(7D), fp(7D), ssd(7D)

       Writing Device Drivers

       Fibre Channel Physical and Signaling Interface (FC-PH) ANSI X3.230: 1994

       Fibre Channel Arbitrated Loop (FC-AL) ANSI X3.272-1996

	Fibre Channel Private Loop SCSI Direct Attach (FC-PLDA) NCITS TR-19:1998

       Fabric Channel Loop Attachment (FC-FLA), NCITS TR-20:1998

DIAGNOSTICS

       The following messages are logged and may also appear on the system console. On the console these messages are preceded by:

       usoc%d:

       where

       usoc%d:
       is the per-port instance number of the usoc controller.

       Fibre Channel is ONLINE

       The Fibre Channel loop is now online.

       Fibre Channel Loop is ONLINE

       The Fibre Channel loop is now online.

       Fibre Channel Loop is OFFLINE

       The Fibre Channel loop is now offline.

       attach failed: device in slave-only slot.

       Move soc+ card to another slot.

       attach failed: alloc soft state.

       Driver did not attach, devices will be inaccessible.

       attach failed: bad soft state.

       Driver did not attach, devices will be inaccessible.

       attach failed: unable to map eeprom

       Driver was unable to map device memory; check for bad hardware.	Driver did not attach to device, devices will be inaccessible.

       attach failed: unable to map XRAM

       Driver was unable to map device memory; check for bad hardware. Driver did not attach to device, devices will be inaccessible.

       attach failed: unable to map registers

       Driver was unable to map device registers; check for bad hardware. Driver did not attach to device,   devices will be inaccessible.

       attach failed: unable to access status register

       Driver was unable to map device	registers; check for bad hardware.  Driver did not attach to device, devices will be inaccessible.

       attach failed: unable to install interrupt handler

       Driver was not able to add the interrupt routine  to the kernel. Driver did not attach to device, devices will be inaccessible.

       attach failed: unable to access host adapter XRAM

       Driver was unable to access device RAM; check for  bad  hardware. Driver did not attach to device,  devices will be inaccessible.

       attach failed: unable to write host adapter XRAM

       Driver was unable to write device RAM; check for bad hardware. Driver did not attach to device, devices will be inaccessible.

       attach failed: read/write mismatch in XRAM

       Driver was unable to verify device RAM; check for  bad hardware. Driver did not attach to device, devices will be inaccessible.

SunOS 5.10							    20 Jul 1999 							  usoc(7D)
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