JDK-6354112 : increase compiler optimization level for libjpeg to improve runtime performance
  • Type: Bug
  • Component: client-libs
  • Sub-Component: javax.imageio
  • Affected Version: 5.0
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: solaris_9
  • CPU: generic
  • Submitted: 2005-11-22
  • Updated: 2008-02-05
  • Resolved: 2005-12-05
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JDK 6
6 b63Fixed
Description
This request is similar to that in 6350086: libjpeg in the JDK is built with
default compiler optimization flags.  By increasing it to a higher level, some
tests which exercise the native IJG JPEG libraries can run a few percent faster.
Comments
EVALUATION Here are the full results ("base" is the default, CC_LOWER_OPT, "higher" is CC_HIGHER_OPT, "highest" is CC_HIGHEST_OPT, -client, -Xms256M -Xmx512M in all cases). The first numbers in each group shows the increase in size of libjpeg for that particular platform. solaris-sparc, SB2000, 900 MHz USIII, 1GB RAM: CC_LOWER_OPT: 278552 CC_HIGHER_OPT: 318512 (+14%) CC_HIGHEST_OPT: 325212 (+17%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=20: base: 715.7626287 (var=16.44%) (100.0%) higher: 806.5375040 (var=1.29%) (112.68%) highest: 814.2657643 (var=0.57%) (113.76%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=1000: base: 5932.671081 (var=54.61%) (100.0%) higher: 6720.583209 (var=0.37%) (113.28%) highest: 6704.545454 (var=0.14%) (113.01%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=4000: base: 4274.646005 (var=21.99%) (100.0%) higher: 4405.892881 (var=1.27%) (103.07%) highest: 4363.239705 (var=1.65%) (102.07%) solaris-i586, W2100z, 2x 2.0 GHz Opteron, 2GB RAM: CC_LOWER_OPT: 264468 CC_HIGHER_OPT: 327784 (+24%) CC_HIGHEST_OPT: 332668 (+26%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=20: base: 2366.841725 (var=0.31%) (100.0%) higher: 2478.230452 (var=0.09%) (104.71%) highest: 2538.540596 (var=0.33%) (107.25%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=1000: base: 14653.59336 (var=0.14%) (100.0%) higher: 15109.47528 (var=0.04%) (103.11%) highest: 14820.42405 (var=0.22%) (101.14%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=4000: base: 13152.48664 (var=0.18%) (100.0%) higher: 13485.04003 (var=0.11%) (102.53%) highest: 13374.19894 (var=0.2%) (101.69%) windows-i586, 2x 2.8 GHz P4, 1GB RAM: CC_LOWER_OPT: 122880 CC_HIGHER_OPT: 147456 (+20%) CC_HIGHEST_OPT: 147456 (+20%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=20: base: 1551.237935 (var=0.99%) (100.0%) higher: 1593.298647 (var=0.32%) (102.71%) highest: 1600.253458 (var=0.67%) (103.16%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=1000: base: 18101.49768 (var=1.35%) (100.0%) higher: 19965.46514 (var=0.84%) (110.3%) highest: 20154.37392 (var=0.34%) (111.34%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=4000: base: 17355.93220 (var=0.22%) (100.0%) higher: 19200.0 (var=0.0%) (110.62%) highest: 19241.04756 (var=0.43%) (110.86%) linux-i586, 2x 733 MHz P3, 256 MB RAM: CC_LOWER_OPT: 182816 CC_HIGHER_OPT: 210931 (+15%) CC_HIGHEST_OPT: 210931 (+15%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=20: base: 657.8912021 (var=0.09%) (100.0%) higher: 680.8606006 (var=0.11%) (103.49%) highest: 660.4515984 (var=5.68%) (100.39%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=1000: base: 4977.540366 (var=0.18%) (100.0%) higher: 4965.019183 (var=0.2%) (99.75%) highest: 5003.573981 (var=0.19%) (100.52%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=4000: base: 2662.672657 (var=83.93%) (100.0%) higher: 2662.229617 (var=83.22%) (99.98%) highest: 2635.914332 (var=31.48%) (99.0%) Looks like not much benefit on linux-i586.
22-11-2005
EVALUATION As per description. If we move all the way up to CC_HIGHEST_OPT, we get a reasonable boost in performance (esp. on Windows) at the cost of a slight increase in library size (on windows-i586, jpeg.dll goes from 122880 bytes to 147456). For example, here are some J2DBench test results taken on 2x 2.8 GHz P4, 1GB RAM, -client, -Xms256M -Xmx512M: imageio.input.image.imageio.reader.tests.read,imageio.opts.size=1000: base: 18010.29159 (var=0.5%) (100.0%) test: 19841.72496 (var=0.72%) (110.17%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=20: base: 1498.279479 (var=0.17%) (100.0%) test: 1535.490456 (var=0.48%) (102.48%) imageio.input.image.imageio.reader.tests.read,imageio.opts.size=4000: base: 17174.29223 (var=3.21%) (100.0%) test: 19120.96667 (var=0.41%) (111.33%) Similar gains are seen for the JPEGCodec and Toolkit tests (since they all share the same native library, jpeg.dll).
22-11-2005