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  23 <CENTER><A HREF="#CONTENTS"><IMG SRC="images/cups-large.gif" BORDER="0" WIDTH="431" HEIGHT="511"><BR>
  24 <H1>CUPS Software Performance Specification</H1></A><BR>
  25 CUPS-SPS-1.2<BR>
  26 Easy Software Products<BR>
  27 Copyright 1997-2003, All Rights Reserved<BR>
  28 </CENTER>
  29 <HR>
  30 <H1 ALIGN="CENTER"><A NAME="CONTENTS">Table of Contents</A></H1>
  31 <BR>
  32 <BR><B><A HREF="#1">1 Scope</A></B>
  33 <UL>
  34 <LI><A HREF="#1_1">1.1 Identification</A></LI>
  35 <LI><A HREF="#1_2">1.2 System Overview</A></LI>
  36 <LI><A HREF="#1_3">1.3 Document Overview</A></LI>
  37 </UL>
  38 <B><A HREF="#2">2 References</A></B>
  39 <UL>
  40 <LI><A HREF="#2_1">2.1 CUPS Documentation</A></LI>
  41 <LI><A HREF="#2_2">2.2 Other Documents</A></LI>
  42 </UL>
  43 <B><A HREF="#3">3 Programs</A></B>
  44 <BR>
  45 <BR><B><A HREF="#4">4 Scheduler Objects</A></B>
  46 <BR>
  47 <BR><B><A HREF="#5">A Glossary</A></B>
  48 <UL>
  49 <LI><A HREF="#5_1">A.1 Terms</A></LI>
  50 <LI><A HREF="#5_2">A.2 Acronyms</A></LI>
  51 </UL>
  52 <HR>
  53 <H1><A NAME="1">1 Scope</A></H1>
  54 <H2><A NAME="1_1">1.1 Identification</A></H2>
  55 <P>This software performance specification provides an analysis of the
  56  memory, disk, and processor utilitization of each program in the Common
  57  UNIX Printing System (&quot;CUPS&quot;) Version 1.2.</P>
  58 <P>For the purposes of comparison, all figures are for the Linux Intel
  59  platform. Memory utilization on other platforms should be similar.</P>
  60 <H2><A NAME="1_2">1.2 System Overview</A></H2>
  61 <P>CUPS provides a portable printing layer for UNIX&reg;-based operating
  62  systems. It has been developed by<A HREF="http://www.easysw.com"> Easy
  63  Software Products</A> to promote a standard printing solution for all
  64  UNIX vendors and users. CUPS provides the System V and Berkeley
  65  command-line interfaces.</P>
  66 <P>CUPS uses the Internet Printing Protocol (&quot;IPP&quot;) as the basis for
  67  managing print jobs and queues. The Line Printer Daemon (&quot;LPD&quot;) Server
  68  Message Block (&quot;SMB&quot;), and AppSocket (a.k.a. JetDirect) protocols are
  69  also supported with reduced functionality. CUPS adds network printer
  70  browsing and PostScript Printer Description (&quot;PPD&quot;) based printing
  71  options to support real-world printing under UNIX.</P>
  72 <P>CUPS also includes a customized version of GNU Ghostscript (currently
  73  based off GNU Ghostscript 5.50) and an image file RIP that are used to
  74  support non-PostScript printers. Sample drivers for HP and EPSON
  75  printers are included that use these filters.</P>
  76 <H2><A NAME="1_3">1.3 Document Overview</A></H2>
  77 <P>This software performance specification is organized into the
  78  following sections:</P>
  79 <UL>
  80 <LI>1 - Scope</LI>
  81 <LI>2 - References</LI>
  82 <LI>3 - Programs</LI>
  83 <LI>4 - Scheduler Objects</LI>
  84 <LI>A - Glossary</LI>
  85 </UL>
  86 <H1><A NAME="2">2 References</A></H1>
  87 <H2><A NAME="2_1">2.1 CUPS Documentation</A></H2>
  88 <P>The following CUPS documentation is referenced by this document:</P>
  89 <UL>
  90 <LI>CUPS-CMP-1.2: CUPS Configuration Management Plan</LI>
  91 <LI>CUPS-IDD-1.2: CUPS System Interface Design Description</LI>
  92 <LI>CUPS-IPP-1.2: CUPS Implementation of IPP</LI>
  93 <LI>CUPS-SAM-1.2.x: CUPS Software Administrators Manual</LI>
  94 <LI>CUPS-SDD-1.2: CUPS Software Design Description</LI>
  95 <LI>CUPS-SPM-1.2.x: CUPS Software Programming Manual</LI>
  96 <LI>CUPS-SSR-1.2: CUPS Software Security Report</LI>
  97 <LI>CUPS-STP-1.2: CUPS Software Test Plan</LI>
  98 <LI>CUPS-SUM-1.2.x: CUPS Software Users Manual</LI>
  99 <LI>CUPS-SVD-1.2: CUPS Software Version Description</LI>
 100 </UL>
 101 <H2><A NAME="2_2">2.2 Other Documents</A></H2>
 102 <P>The following non-CUPS documents are referenced by this document:</P>
 103 <UL>
 104 <LI><A HREF="http://partners.adobe.com/asn/developer/PDFS/TN/5003.PPD_Spec_v4.3.pdf">
 105 Adobe PostScript Printer Description File Format Specification, Version
 106  4.3.</A></LI>
 107 <LI><A HREF="http://partners.adobe.com/asn/developer/PDFS/TN/PLRM.pdf">
 108 Adobe PostScript Language Reference, Third Edition.</A></LI>
 109 <LI>IPP: Job and Printer Set Operations</LI>
 110 <LI>IPP/1.1: Encoding and Transport</LI>
 111 <LI>IPP/1.1: Implementers Guide</LI>
 112 <LI>IPP/1.1: Model and Semantics</LI>
 113 <LI><A HREF="http://www.ietf.org/rfc/rfc1179.txt">RFC 1179, Line Printer
 114  Daemon Protocol</A></LI>
 115 <LI><A HREF="http://www.ietf.org/rfc/rfc2567.txt">RFC 2567, Design Goals
 116  for an Internet Printing Protocol</A></LI>
 117 <LI><A HREF="http://www.ietf.org/rfc/rfc2568.txt">RFC 2568, Rationale
 118  for the Structure of the Model and Protocol for the Internet Printing
 119  Protocol</A></LI>
 120 <LI><A HREF="http://www.ietf.org/rfc/rfc2569.txt">RFC 2569, Mapping
 121  between LPD and IPP Protocols</A></LI>
 122 <LI><A HREF="http://www.ietf.org/rfc/rfc2616.txt">RFC 2616, Hypertext
 123  Transfer Protocol -- HTTP/1.1</A></LI>
 124 <LI><A HREF="http://www.ietf.org/rfc/rfc2617.txt">RFC 2617, HTTP
 125  Authentication: Basic and Digest Access</A> Authentication</LI>
 126 </UL>
 127 <H1><A NAME="3">3 Programs</A></H1>
 128 <P>The following table describes the average memory, disk, and CPU usage
 129  of each program in CUPS.</P>
 130 <P>The base memory column shows the initial memory requirements for each
 131  program, including any shared libraries that are provided by CUPS.</P>
 132 <P>The max memory column shows the maximum amount of memory that will be
 133  used by the program based upon the default configuration settings
 134  supplied with CUPS.</P>
 135 <P>The temp files column indicates whether any temporary files are
 136  created.</P>
 137 <P>The CPU usage column specifies a relative CPU usage by the program
 138  under normal conditions, either low, medium, or high. Low usage
 139  indicates that the program will never use more than 33% of the
 140  available CPU time. Medium usage indicates the program will use as much
 141  as 66% of the available CPU time. High usage indicates the program uses
 142  66% or more of the available CPU time.
 143 <CENTER>
 144 <TABLE BORDER="1" WIDTH="80%">
 145 <TR><TH COLSPAN="3">Backends</TH></TR>
 146 <TR><TH>Program</TH><TH>Base Memory</TH><TH>Max Memory</TH><TH>Temp
 147  Files</TH><TH>CPU Usage</TH></TR>
 148 <TR><TD>ipp</TD><TD>91k</TD><TD>256k</TD><TD>Up to size of print file</TD><TD>
 149 Low</TD></TR>
 150 <TR><TD>lpd</TD><TD>89k</TD><TD>89k</TD><TD>Up to size of print file</TD><TD>
 151 Low</TD></TR>
 152 <TR><TD>parallel</TD><TD>85k</TD><TD>85k</TD><TD>Up to size of print
 153  file</TD><TD>Low</TD></TR>
 154 <TR><TD>serial</TD><TD>85k</TD><TD>85k</TD><TD>Up to size of print file</TD><TD>
 155 Low</TD></TR>
 156 <TR><TD>socket</TD><TD>85k</TD><TD>85k</TD><TD>Up to size of print file</TD><TD>
 157 Low</TD></TR>
 158 <TR><TD>usb</TD><TD>85k</TD><TD>85k</TD><TD>Up to size of print file</TD><TD>
 159 Low</TD></TR>
 160 <TR><TH COLSPAN="3">CGIs</TH></TR>
 161 <TR><TH>Program</TH><TH>Base Memory</TH><TH>Max Memory</TH><TH>Temp
 162  Files</TH><TH>CPU Usage</TH></TR>
 163 <TR><TD>admin.cgi</TD><TD>107k</TD><TD>256k</TD><TD>Up to size of PPD
 164  file</TD><TD>Medium</TD></TR>
 165 <TR><TD>classes.cgi</TD><TD>95k</TD><TD>Size of class objects</TD><TD>
 166 None</TD><TD>Medium</TD></TR>
 167 <TR><TD>jobs.cgi</TD><TD>93k</TD><TD>Size of job objects</TD><TD>None</TD><TD>
 168 Medium</TD></TR>
 169 <TR><TD>printers.cgi</TD><TD>95k</TD><TD>Size of printer objects</TD><TD>
 170 None</TD><TD>Medium</TD></TR>
 171 <TR><TH COLSPAN="3">Command-Line Programs</TH></TR>
 172 <TR><TH>Program</TH><TH>Base Memory</TH><TH>Max Memory</TH><TH>Temp
 173  Files</TH><TH>CPU Usage</TH></TR>
 174 <TR><TD>accept</TD><TD>88k</TD><TD>128k</TD><TD>None</TD><TD>Low</TD></TR>
 175 <TR><TD>cancel</TD><TD>88k</TD><TD>128k</TD><TD>None</TD><TD>Low</TD></TR>
 176 <TR><TD>disable</TD><TD>88k</TD><TD>128k</TD><TD>None</TD><TD>Low</TD></TR>
 177 <TR><TD>enable</TD><TD>88k</TD><TD>128k</TD><TD>None</TD><TD>Low</TD></TR>
 178 <TR><TD>lp</TD><TD>90k</TD><TD>256k</TD><TD>None</TD><TD>Low</TD></TR>
 179 <TR><TD>lpadmin</TD><TD>148k</TD><TD>256k</TD><TD>None</TD><TD>Low</TD></TR>
 180 <TR><TD>lpc</TD><TD>86k</TD><TD>Size of job and printer objects</TD><TD>
 181 None</TD><TD>Medium</TD></TR>
 182 <TR><TD>lpinfo</TD><TD>89k</TD><TD>Size of device and PPD objects</TD><TD>
 183 None</TD><TD>Medium</TD></TR>
 184 <TR><TD>lpmove</TD><TD>88k</TD><TD>128k</TD><TD>None</TD><TD>Low</TD></TR>
 185 <TR><TD>lpoptions</TD><TD>89k</TD><TD>128k</TD><TD>None</TD><TD>Low</TD></TR>
 186 <TR><TD>lppasswd</TD><TD>90k</TD><TD>90k</TD><TD>None</TD><TD>Low</TD></TR>
 187 <TR><TD>lpq</TD><TD>87k</TD><TD>Size of job objects</TD><TD>None</TD><TD>
 188 Medium</TD></TR>
 189 <TR><TD>lpr</TD><TD>87k</TD><TD>256k</TD><TD>None</TD><TD>Low</TD></TR>
 190 <TR><TD>lprm</TD><TD>84k</TD><TD>128k</TD><TD>None</TD><TD>Low</TD></TR>
 191 <TR><TD>lpstat</TD><TD>119k</TD><TD>Size of job, printer, and class
 192  objects</TD><TD>None</TD><TD>Medium</TD></TR>
 193 <TR><TD>reject</TD><TD>88k</TD><TD>128k</TD><TD>None</TD><TD>Low</TD></TR>
 194 <TR><TH COLSPAN="3">Daemons</TH></TR>
 195 <TR><TH>Program</TH><TH>Base Memory</TH><TH>Max Memory</TH><TH>Temp
 196  Files</TH><TH>CPU Usage</TH></TR>
 197 <TR><TD>cups-lpd</TD><TD>92k</TD><TD>256k</TD><TD>One file per control
 198  or data file from client</TD><TD>Low</TD></TR>
 199 <TR><TD>cupsd</TD><TD>308k</TD><TD>See Scheduler Requirements</TD><TD>
 200 See Scheduler Requirements</TD><TD>Medium</TD></TR>
 201 <TR><TD>cups-polld</TD><TD>84k</TD><TD>Size of printer and class objects</TD><TD>
 202 None</TD><TD>Low</TD></TR>
 203 <TR><TH COLSPAN="3">Filters</TH></TR>
 204 <TR><TH>Program</TH><TH>Base Memory</TH><TH>Max Memory</TH><TH>Temp
 205  Files</TH><TH>CPU Usage</TH></TR>
 206 <TR><TD>hpgltops</TD><TD>263k</TD><TD>320k</TD><TD>None</TD><TD>Medium</TD>
 207 </TR>
 208 <TR><TD>imagetops</TD><TD>628k</TD><TD>10M</TD><TD>Swap file for
 209  uncompressed image data</TD><TD>Medium</TD></TR>
 210 <TR><TD>imagetoraster</TD><TD>652k</TD><TD>10M</TD><TD>Swap file for
 211  uncompressed image data</TD><TD>High</TD></TR>
 212 <TR><TD>pstops</TD><TD>775k</TD><TD>840k</TD><TD>Up to size of print
 213  file</TD><TD>Medium</TD></TR>
 214 <TR><TD>pstoraster</TD><TD>4M</TD><TD>14M</TD><TD>Swap file for command
 215  lists</TD><TD>High</TD></TR>
 216 <TR><TD>rastertoepson</TD><TD>693k</TD><TD>1M</TD><TD>None</TD><TD>Low</TD>
 217 </TR>
 218 <TR><TD>rastertohp</TD><TD>690k</TD><TD>1M</TD><TD>None</TD><TD>Low</TD></TR>
 219 <TR><TD>texttops</TD><TD>638k</TD><TD>4*cols*rows</TD><TD>None</TD><TD>
 220 Low</TD></TR>
 221 </TABLE>
 222 </CENTER>
 223 </P>
 224 <H1><A NAME="4">4 Scheduler Objects</A></H1>
 225 <P>The <CODE>cupsd</CODE> program is the CUPS scheduler process. It
 226  manages many interdependent server objects that are used to manage and
 227  print files to printers.</P>
 228 <P>The following table provides the memory and disk cost associated with
 229  each server object.
 230 <CENTER>
 231 <TABLE BORDER="1" WIDTH="80%">
 232 <TR><TH>Object</TH><TH>Memory Per</TH><TH>Disk Per</TH></TR>
 233 <TR><TD>Browse ACL</TD><TD>1k</TD><TD>120</TD></TR>
 234 <TR><TD>Browse Poll</TD><TD>24</TD><TD>80</TD></TR>
 235 <TR><TD>Browse Relay</TD><TD>28</TD><TD>80</TD></TR>
 236 <TR><TD>Certificate</TD><TD>76</TD><TD>32</TD></TR>
 237 <TR><TD>Class</TD><TD>9k</TD><TD>200</TD></TR>
 238 <TR><TD>Client</TD><TD>13k</TD><TD>-</TD></TR>
 239 <TR><TD>Device</TD><TD>256</TD><TD>-</TD></TR>
 240 <TR><TD>Job</TD><TD>2k</TD><TD>1k + size of document files</TD></TR>
 241 <TR><TD>Location ACL</TD><TD>1k</TD><TD>120</TD></TR>
 242 <TR><TD>MIME Filter</TD><TD>268</TD><TD>80</TD></TR>
 243 <TR><TD>MIME Type</TD><TD>340</TD><TD>80</TD></TR>
 244 <TR><TD>PPD</TD><TD>200</TD><TD>656</TD></TR>
 245 <TR><TD>Printer</TD><TD>11k</TD><TD>32k</TD></TR>
 246 </TABLE>
 247 </CENTER>
 248 </P>
 249 <H1 TYPE="A" VALUE="1"><A NAME="5">A Glossary</A></H1>
 250 <H2><A NAME="5_1">A.1 Terms</A></H2>
 251 <DL>
 252 <DT>C</DT>
 253 <DD>A computer language.</DD>
 254 <DT>parallel</DT>
 255 <DD>Sending or receiving data more than 1 bit at a time.</DD>
 256 <DT>pipe</DT>
 257 <DD>A one-way communications channel between two programs.</DD>
 258 <DT>serial</DT>
 259 <DD>Sending or receiving data 1 bit at a time.</DD>
 260 <DT>socket</DT>
 261 <DD>A two-way network communications channel.</DD>
 262 </DL>
 263 <H2><A NAME="5_2">A.2 Acronyms</A></H2>
 264 <DL>
 265 <DT>ASCII</DT>
 266 <DD>American Standard Code for Information Interchange</DD>
 267 <DT>CUPS</DT>
 268 <DD>Common UNIX Printing System</DD>
 269 <DT>ESC/P</DT>
 270 <DD>EPSON Standard Code for Printers</DD>
 271 <DT>FTP</DT>
 272 <DD>File Transfer Protocol</DD>
 273 <DT>HP-GL</DT>
 274 <DD>Hewlett-Packard Graphics Language</DD>
 275 <DT>HP-PCL</DT>
 276 <DD>Hewlett-Packard Page Control Language</DD>
 277 <DT>HP-PJL</DT>
 278 <DD>Hewlett-Packard Printer Job Language</DD>
 279 <DT>IETF</DT>
 280 <DD>Internet Engineering Task Force</DD>
 281 <DT>IPP</DT>
 282 <DD>Internet Printing Protocol</DD>
 283 <DT>ISO</DT>
 284 <DD>International Standards Organization</DD>
 285 <DT>LPD</DT>
 286 <DD>Line Printer Daemon</DD>
 287 <DT>MIME</DT>
 288 <DD>Multimedia Internet Mail Exchange</DD>
 289 <DT>PPD</DT>
 290 <DD>PostScript Printer Description</DD>
 291 <DT>SMB</DT>
 292 <DD>Server Message Block</DD>
 293 <DT>TFTP</DT>
 294 <DD>Trivial File Transfer Protocol</DD>
 295 </DL>
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