Rendering performance comparison between FreeType 2.6.5 and current `mas

Hi all!

As part of my GSoC project, I ran some benchmarks comparing the performance of FreeType version 2.6.5 (released in 2016) with the current master, here are the results:

NotoMono Regular font:

(notomono_comp.png)

(notomono_comp_expanded.png)

Arial Font:

(arial_comp.png)

(arial_comp_expanded.png)

(Generated using: “ftbench -b c -s size font.ttf”)

The current version is consistently about 50% faster at all sizes, demonstrating the effort that has gone into improving FreeType.

I also ran the perf utility, results attached (.data files are the binaries generated by perf, .txt files are human readable output generated by perf report)

(Generated using “perf record ftbench -b c -s size font.ttf”)

Some things to observe:

perf_master_noto10.txt:

# Overhead Command Shared Object Symbol

# ........ .......... ..................... ...........................................
20.35% lt-ftbench libfreetype.so.6.18.3 [.] TT_RunIns

10.69% lt-ftbench libfreetype.so.6.18.3 [.] gray_render_line

5.06% lt-ftbench libfreetype.so.6.18.3 [.] Ins_IUP.constprop.0

5.05% lt-ftbench libfreetype.so.6.18.3 [.] TT_Load_Simple_Glyph

4.86% lt-ftbench libfreetype.so.6.18.3 [.] _iup_worker_interpolate

perf_master_noto100.txt:

# Overhead Command Shared Object Symbol

# ........ .......... ..................... ...........................................

25.62% lt-ftbench libfreetype.so.6.18.3 [.] gray_render_line

17.21% lt-ftbench libfreetype.so.6.18.3 [.] gray_set_cell

16.02% lt-ftbench libfreetype.so.6.18.3 [.] gray_convert_glyph

8.67% lt-ftbench libfreetype.so.6.18.3 [.] TT_RunIns

4.09% lt-ftbench libfreetype.so.6.18.3 [.] gray_conic_to

At small sizes, the “TT_RunIns” function dominates, while at larger ones, the render line function is prominent

Other notable functions are ` Ins_IUP.constprop.0`,`_iup_worker_interpolate` which are not prominent at large sizes

If someone could elaborate on these functions, that would be great 😊

Comparing the version 2.6.5 to current `master`:

perf_master_noto10.txt

# Overhead Command Shared Object Symbol

# ........ .......... ..................... ...........................................

20.35% lt-ftbench libfreetype.so.6.18.3 [.] TT_RunIns

10.69% lt-ftbench libfreetype.so.6.18.3 [.] gray_render_line

5.06% lt-ftbench libfreetype.so.6.18.3 [.] Ins_IUP.constprop.0

5.05% lt-ftbench libfreetype.so.6.18.3 [.] TT_Load_Simple_Glyph

4.86% lt-ftbench libfreetype.so.6.18.3 [.] _iup_worker_interpolate

4.28% lt-ftbench libfreetype.so.6.18.3 [.] gray_set_cell

3.06% lt-ftbench libfreetype.so.6.18.3 [.] load_truetype_glyph

2.93% lt-ftbench libfreetype.so.6.18.3 [.] gray_convert_glyph

2.81% lt-ftbench libfreetype.so.6.18.3 [.] gray_conic_to

2.52% lt-ftbench libfreetype.so.6.18.3 [.] FT_Outline_Get_CBox

2.17% lt-ftbench libfreetype.so.6.18.3 [.] FT_Outline_Decompose

2.11% lt-ftbench libfreetype.so.6.18.3 [.] FT_MulDiv

1.64% lt-ftbench libfreetype.so.6.18.3 [.] Ins_DELTAP.constprop.0

1.22% lt-ftbench libfreetype.so.6.18.3 [.] FT_DivFix

1.10% lt-ftbench libfreetype.so.6.18.3 [.] Compute_Point_Displacement.constprop.0

1.07% lt-ftbench libfreetype.so.6.18.3 [.] TT_Hint_Glyph

1.05% lt-ftbench libfreetype.so.6.18.3 [.] Move_Zp2_Point

1.03% lt-ftbench libfreetype.so.6.18.3 [.] Ins_IP.constprop.0

perf_265_noto_10.txt:

# Overhead Command Shared Object Symbol

# ........ .......... ..................... ...........................................

24.69% lt-ftbench libfreetype.so.6.12.5 [.] TT_RunIns

13.22% lt-ftbench libfreetype.so.6.12.5 [.] gray_render_line

7.93% lt-ftbench [unknown] [k] 0xffffffff82475600

5.98% lt-ftbench libfreetype.so.6.12.5 [.] gray_record_cell

4.70% lt-ftbench libfreetype.so.6.12.5 [.] TT_Load_Simple_Glyph

4.47% lt-ftbench libfreetype.so.6.12.5 [.] _iup_worker_interpolate

2.75% lt-ftbench libfreetype.so.6.12.5 [.] load_truetype_glyph

2.73% lt-ftbench libfreetype.so.6.12.5 [.] gray_convert_glyph

2.65% lt-ftbench libfreetype.so.6.12.5 [.] gray_render_conic.isra.0

2.56% lt-ftbench libfreetype.so.6.12.5 [.] gray_hline

2.35% lt-ftbench libfreetype.so.6.12.5 [.] FT_Outline_Decompose

1.90% lt-ftbench libfreetype.so.6.12.5 [.] FT_MulDiv

1.54% lt-ftbench libfreetype.so.6.12.5 [.] Ins_DELTAP.constprop.0

1.35% lt-ftbench libfreetype.so.6.12.5 [.] gray_render_span

1.30% lt-ftbench libfreetype.so.6.12.5 [.] Compute_Point_Displacement.constprop.0

1.30% lt-ftbench libfreetype.so.6.12.5 [.] gray_set_cell

1.14% lt-ftbench libfreetype.so.6.12.5 [.] FT_Outline_Get_CBox

The most expensive functions seem mostly the same, except for ` Ins_IUP.constprop.0`

This is my first time using the perf utility so I might have missed something.

Please let me know if there are other/better ways of benchmarking FreeType or if I missed anything.

Regards,

Anurag

From:	Anurag Thakur
Subject:	Rendering performance comparison between FreeType 2.6.5 and current `master`
Date:	Mon, 5 Sep 2022 17:09:37 +0000