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NEWS: Add notes for 1.3.4 snapshot
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Carl Worth
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NEWS
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NEWS
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Snapshot 1.3.4 (2006-11-22 Carl Worth <cworth@cworth.org>)
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==========================================================
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This is the second development snapshot in the 1.3 series. It comes
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one week after the 1.3.2 snapshot.
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This snapshot has a couple of significant performance improvements,
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and also adds new support for producing multi-page SVG output, (when
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targeting SVG 1.2)---thanks to Emmanuel Pacaud. The details of the
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performance improvements are as follows:
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1. The long-awaited "new tessellator".
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The credit for this being an improvement goes to Joonas Pihlaja. He
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took my really slow code and really put it through its paces to get
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the dramatic performance improvement seen below (up to 38x faster
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on realistic cases, and more than 10x faster for the zrusin_another
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test).
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His own writeup of the work he did is quite thorough, but more than
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can be quoted here. Please see his post for the interesting details:
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http://lists.freedesktop.org/archives/cairo/2006-November/008483.html
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(Though note that this snapshot also includes some additional,
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significant improvements that were only sketched out in that
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email---see "Generating fewer trapezoids").
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2. More floating-point improvements
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Daniel Amelang continues to work the magic he began in the 1.3.2
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snapshot. This time he short-circuits floating-point
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transformations by identity matrices and applies the earlier
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floating-to-fixed-point technique to the problem of rounding.
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The improvements here will primarily benefit text performance, and
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will benefit platforms without hardware floating-point more than
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those that have it, (some text tests show 20% improvement on an x86
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machine and closer to 80% improvement on arm).
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The performance chart comparing 1.3.2 to 1.3.4 really speaks for
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itself, (this is on an x86 laptop). This is quite a lot of progress
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for one week:
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xlib-rgb stroke_similar_rgba_over-256 74.99 1.45% -> 2.03 68.38%: 36.86x speedup
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███████████████████████████████████▉
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xlib-rgb stroke_similar_rgba_source-256 78.23 1.43% -> 3.30 67.05%: 23.71x speedup
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██████████████████████▊
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xlib-rgba tessellate-256-100 820.42 0.15% -> 35.06 2.84%: 23.40x speedup
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██████████████████████▍
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image-rgba tessellate-256-100 819.55 0.32% -> 35.04 3.56%: 23.39x speedup
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██████████████████████▍
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xlib-rgb stroke_image_rgba_over-256 78.10 1.43% -> 4.33 65.56%: 18.04x speedup
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█████████████████
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xlib-rgb stroke_image_rgba_source-256 80.11 1.63% -> 5.75 63.99%: 13.94x speedup
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█████████████
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xlib-rgba zrusin_another_tessellate-415 89.22 0.35% -> 8.38 5.23%: 10.65x speedup
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█████████▋
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image-rgba zrusin_another_tessellate-415 87.38 0.89% -> 8.37 5.22%: 10.44x speedup
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█████████▍
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image-rgba zrusin_another_fill-415 117.67 1.34% -> 12.88 2.77%: 9.14x speedup
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████████▏
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xlib-rgba zrusin_another_fill-415 140.52 1.57% -> 15.79 2.88%: 8.90x speedup
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███████▉
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image-rgba tessellate-64-100 9.68 3.42% -> 1.42 0.60%: 6.82x speedup
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█████▉
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xlib-rgba tessellate-64-100 9.78 4.35% -> 1.45 0.83%: 6.72x speedup
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█████▊
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xlib-rgb stroke_linear_rgba_over-256 46.01 2.44% -> 7.74 54.51%: 5.94x speedup
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█████
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xlib-rgb stroke_linear_rgba_source-256 48.09 2.15% -> 9.14 53.00%: 5.26x speedup
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████▎
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xlib-rgb stroke_radial_rgba_over-256 50.96 2.34% -> 12.46 47.99%: 4.09x speedup
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███▏
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xlib-rgb stroke_radial_rgba_source-256 53.06 1.57% -> 13.96 46.57%: 3.80x speedup
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██▊
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image-rgba paint_similar_rgba_source-256 0.12 1.57% -> 0.08 9.92%: 1.42x speedup
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▍
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image-rgba paint_image_rgba_source-256 0.12 2.49% -> 0.08 10.70%: 1.41x speedup
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▍
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image-rgba world_map-800 356.28 0.46% -> 275.72 1.15%: 1.29x speedup
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▎
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xlib-rgba world_map-800 456.81 0.39% -> 357.95 1.39%: 1.28x speedup
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▎
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image-rgb tessellate-16-100 0.09 0.57% -> 0.07 3.43%: 1.23x speedup
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▎
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image-rgba tessellate-16-100 0.09 0.06% -> 0.07 2.46%: 1.23x speedup
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▎
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image-rgba text_solid_rgb_over-256 5.39 4.01% -> 4.47 0.70%: 1.21x speedup
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▎
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image-rgba text_solid_rgba_over-256 5.37 0.82% -> 4.45 0.75%: 1.21x speedup
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▎
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image-rgba text_image_rgb_over-64 0.78 0.10% -> 0.65 0.74%: 1.20x speedup
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▎
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image-rgba text_image_rgba_over-64 0.78 0.29% -> 0.65 0.68%: 1.19x speedup
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▎
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image-rgb text_solid_rgb_over-64 0.76 2.45% -> 0.63 0.81%: 1.19x speedup
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▎
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image-rgba text_solid_rgba_over-64 0.76 0.33% -> 0.64 0.66%: 1.19x speedup
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▎
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image-rgba text_similar_rgba_over-256 5.99 4.72% -> 5.04 1.09%: 1.19x speedup
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▎
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We should point out that there is some potential for slowdown in this
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snapshot. The following are the worst slowdowns reported by the cairo
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performance suite when comparing 1.3.2 to 1.3.4:
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image-rgba subimage_copy-256 0.01 0.87% -> 0.01 3.61%: 1.45x slowdown
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▌
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xlib-rgb paint_solid_rgb_over-256 0.31 10.23% -> 0.38 0.33%: 1.26x slowdown
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▎
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image-rgba box-outline-fill-100 0.01 0.30% -> 0.01 2.52%: 1.21x slowdown
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▎
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image-rgba fill_solid_rgb_over-64 0.20 1.22% -> 0.22 1.59%: 1.12x slowdown
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▏
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image-rgb fill_similar_rgb_over-64 0.21 1.04% -> 0.24 1.06%: 1.11x slowdown
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▏
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image-rgba fill_image_rgb_over-64 0.21 1.19% -> 0.24 0.72%: 1.11x slowdown
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▏
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image-rgba fill_similar_rgb_over-64 0.21 0.18% -> 0.24 0.30%: 1.11x slowdown
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▏
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image-rgb fill_solid_rgba_over-64 0.22 1.66% -> 0.24 1.15%: 1.11x slowdown
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▏
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image-rgb fill_image_rgb_over-64 0.21 0.14% -> 0.24 0.80%: 1.11x slowdown
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▏
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image-rgba fill_image_rgba_over-64 0.22 1.34% -> 0.25 0.20%: 1.11x slowdown
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▏
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image-rgba fill_solid_rgba_over-64 0.22 1.48% -> 0.24 0.95%: 1.11x slowdown
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▏
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image-rgb fill_similar_rgba_over-64 0.22 1.13% -> 0.25 1.25%: 1.10x slowdown
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▏
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The 45% slowdown for subimage_copy is an extreme case. It's unlikely
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to hit many applications unless they often use cairo_rectangle;
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cairo_fill to copy a single pixel at a time. In any case, it shows a
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worst-case impact of the overhead of the new tessellator. The other
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slowdowns (~ 10%) are probably more realistic, and still very
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concerning.
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We will work to ensure that performance regressions like these are not
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present from one major release of cairo to the next, (for example,
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from 1.2 to 1.4).
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But we're putting this 1.3.4 snapshot out there now, even with this
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potential slowdown so that people can experiment with it. If you've
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got complex geometry, we hope you will see some benefit from the new
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tessellator. If you've got primarily simple geometry, we hope things
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won't slowdown too much, but please let us know what slowdown you see,
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if any, so we can calibrate our performance suite against real-world
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impacts.
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Thanks, and have fun with cairo!
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Snapshot 1.3.2 (2006-11-14 Carl Worth <cworth@cworth.org>)
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==========================================================
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This is the first development snapshot since the 1.2 stable series
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