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CUPS Software Performance Specification

CUPS-SPS-1.1
Easy Software Products
Copyright 1997-2005, All Rights Reserved

Table of Contents

• 1.1 Identification
• 1.2 System Overview
• 1.3 Document Overview

• 2.1 CUPS Documentation
• 2.2 Other Documents

• A.1 Terms
• A.2 Acronyms

1 Scope

1.1 Identification

This software performance specification provides an analysis of the memory, disk, and processor utilitization of each program in the Common UNIX Printing System ("CUPS") Version 1.1.

For the purposes of comparison, all figures are for the Linux Intel platform. Memory utilization on other platforms should be similar.

1.2 System Overview

CUPS provides a portable printing layer for UNIX®-based operating systems. It has been developed by Easy Software Products to promote a standard printing solution for all UNIX vendors and users. CUPS provides the System V and Berkeley command-line interfaces.

CUPS uses the Internet Printing Protocol ("IPP") as the basis for managing print jobs and queues. The Line Printer Daemon ("LPD") Server Message Block ("SMB"), and AppSocket (a.k.a. JetDirect) protocols are also supported with reduced functionality. CUPS adds network printer browsing and PostScript Printer Description ("PPD") based printing options to support real-world printing under UNIX.

CUPS includes an image file RIP that supports printing of image files to non-PostScript printers. A customized version of GNU Ghostscript 7.05 for CUPS called ESP Ghostscript is available separately to support printing of PostScript files within the CUPS driver framework. Sample drivers for Dymo, EPSON, HP, and OKIDATA printers are included that use these filters.

Drivers for thousands of printers are provided with our ESP Print Pro software, available at:

    http://www.easysw.com/printpro/

CUPS is licensed under the GNU General Public License and GNU Library General Public License. Please contact Easy Software Products for commercial support and "binary distribution" rights.

1.3 Document Overview

This software performance specification is organized into the following sections:

• 1 - Scope
• 2 - References
• 3 - Programs
• 4 - Scheduler Objects
• A - Glossary

2 References

2.1 CUPS Documentation

The following CUPS documentation is referenced by this document:

• CUPS-CMP-1.1: CUPS Configuration Management Plan
• CUPS-IDD-1.1: CUPS System Interface Design Description
• CUPS-IPP-1.1: CUPS Implementation of IPP
• CUPS-SAM-1.1.x: CUPS Software Administrators Manual
• CUPS-SDD-1.1: CUPS Software Design Description
• CUPS-SPM-1.1.x: CUPS Software Programming Manual
• CUPS-SSR-1.1: CUPS Software Security Report
• CUPS-STP-1.1: CUPS Software Test Plan
• CUPS-SUM-1.1.x: CUPS Software Users Manual
• CUPS-SVD-1.1: CUPS Software Version Description

2.2 Other Documents

The following non-CUPS documents are referenced by this document:

• Adobe PostScript Printer Description File Format Specification, Version 4.3.
• Adobe PostScript Language Reference, Third Edition.
• IPP/1.1: Implementers Guide
• RFC 1179, Line Printer Daemon Protocol
• RFC 2396, Uniform Resource Identifiers (URI): Generic Syntax
• RFC 2567, Design Goals for an Internet Printing Protocol
• RFC 2568, Rationale for the Structure of the Model and Protocol for the Internet Printing Protocol
• RFC 2569, Mapping between LPD and IPP Protocols
• RFC 2616, Hypertext Transfer Protocol -- HTTP/1.1
• RFC 2617, HTTP Authentication: Basic and Digest Access Authentication
• RFC 2910, IPP/1.1: Encoding and Transport
• RFC 2911, IPP/1.1: Model and Semantics
• RFC 3380, IPP: Job and Printer Set Operations

3 Programs

The following table describes the average memory, disk, and CPU usage of each program in CUPS.

The base memory column shows the initial memory requirements for each program, including any shared libraries that are provided by CUPS.

The max memory column shows the maximum amount of memory that will be used by the program based upon the default configuration settings supplied with CUPS.

The temp files column indicates whether any temporary files are created.

The CPU usage column specifies a relative CPU usage by the program under normal conditions, either low, medium, or high. Low usage indicates that the program will never use more than 33% of the available CPU time. Medium usage indicates the program will use as much as 66% of the available CPU time. High usage indicates the program uses 66% or more of the available CPU time.

4 Scheduler Objects

The cupsd program is the CUPS scheduler process. It manages many interdependent server objects that are used to manage and print files to printers.

The following table provides the memory and disk cost associated with each server object.

A Glossary

A.1 Terms

C

A computer language.

parallel

Sending or receiving data more than 1 bit at a time.

pipe

A one-way communications channel between two programs.

serial

Sending or receiving data 1 bit at a time.

socket

A two-way network communications channel.

A.2 Acronyms

ASCII

American Standard Code for Information Interchange

CUPS

Common UNIX Printing System

ESC/P

EPSON Standard Code for Printers

FTP

File Transfer Protocol

HP-GL

Hewlett-Packard Graphics Language

HP-PCL

Hewlett-Packard Page Control Language

HP-PJL

Hewlett-Packard Printer Job Language

IETF

Internet Engineering Task Force

IPP

Internet Printing Protocol

ISO

International Standards Organization

LPD

Line Printer Daemon

MIME

Multimedia Internet Mail Exchange

PPD

PostScript Printer Description

SMB

Server Message Block

TFTP

Trivial File Transfer Protocol