(Improvements) Rune operations optimization by pl752 · Pull Request #1252 · FirebirdSQL/NETProvider

pl752 · 2025-12-29T07:07:41Z

Decided to split up my previous pull request (#1247) to multiple PRs due to it having set of changes too broad in my opinion. Ran tests as usual for fb3 server and embedded. Updated to current master branch state.

TLDR: Small set of optimizations, improving speed and alloc volumes of string methods tenfold (up to 3x if including I/O and real db engine for select queries containing char100 field in my case) and also including ability to better utilize modern processors SIMD instructions for BMP-only (single char per rune) strings.

Synthetic (serverless, no I/O) benchmarks

Implemented rune ops:

// * Summary *
BenchmarkDotNet v0.15.8, Windows 10 (10.0.19044.6691/21H2/November2021Update)
AMD Ryzen 7 5800H with Radeon Graphics 3.20GHz, 1 CPU, 16 logical and 8 physical cores
.NET SDK 10.0.101
[Host] : .NET 8.0.22 (8.0.22, 8.0.2225.52707), X64 RyuJIT x86-64-v3
Job-JMDAGQ : .NET 10.0.1 (10.0.1, 10.0.125.57005), X64 RyuJIT x86-64-v3
Job-OOTPKI : .NET 8.0.22 (8.0.22, 8.0.2225.52707), X64 RyuJIT x86-64-v3

Method	Job	Toolchain	Kind	RuneLength	MaxRuneCount	Mean	Error	StdDev	Gen0	Allocated
'old truncate via EnumerateRunesToChars'	Job-JMDAGQ	.NET 10.0	Ascii	128	512	2,490.0 ns	39.22 ns	36.69 ns	1.0414	8712 B
'new TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	Ascii	128	512	110.8 ns	2.15 ns	1.91 ns	0.0334	280 B
'old truncate via EnumerateRunesToChars'	Job-OOTPKI	.NET 8.0	Ascii	128	512	3,002.9 ns	54.82 ns	51.27 ns	1.0414	8712 B
'new TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	Ascii	128	512	108.2 ns	1.94 ns	1.81 ns	0.0334	280 B
'old truncate via EnumerateRunesToChars'	Job-JMDAGQ	.NET 10.0	Ascii	1024	512	9,842.2 ns	196.62 ns	201.91 ns	4.0588	34056 B
'new TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	Ascii	1024	512	376.1 ns	4.77 ns	4.46 ns	0.1249	1048 B
'old truncate via EnumerateRunesToChars'	Job-OOTPKI	.NET 8.0	Ascii	1024	512	11,843.6 ns	178.52 ns	166.99 ns	4.0588	34056 B
'new TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	Ascii	1024	512	423.3 ns	7.58 ns	6.72 ns	0.1249	1048 B
'old truncate via EnumerateRunesToChars'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	128	512	2,749.5 ns	53.15 ns	49.72 ns	1.0490	8776 B
'new TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	128	512	133.1 ns	2.38 ns	2.11 ns	0.0410	344 B
'old truncate via EnumerateRunesToChars'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	128	512	3,315.5 ns	61.21 ns	57.26 ns	1.0490	8776 B
'new TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	128	512	126.6 ns	1.03 ns	0.91 ns	0.0410	344 B
'old truncate via EnumerateRunesToChars'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	1024	512	10,957.8 ns	157.33 ns	139.47 ns	4.0894	34312 B
'new TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	1024	512	453.9 ns	8.40 ns	7.86 ns	0.1554	1304 B
'old truncate via EnumerateRunesToChars'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	1024	512	12,647.8 ns	113.42 ns	100.54 ns	4.0894	34312 B
'new TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	1024	512	449.2 ns	5.65 ns	5.01 ns	0.1554	1304 B
'old truncate via EnumerateRunesToChars'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	128	512	3,225.2 ns	28.44 ns	25.21 ns	1.0681	8936 B
'new TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	128	512	165.1 ns	3.34 ns	5.67 ns	0.0601	504 B
'old truncate via EnumerateRunesToChars'	Job-OOTPKI	.NET 8.0	MostlySurrogates	128	512	3,867.0 ns	40.20 ns	37.61 ns	1.0681	8936 B
'new TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	MostlySurrogates	128	512	161.0 ns	3.25 ns	7.84 ns	0.0601	504 B
'old truncate via EnumerateRunesToChars'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	1024	512	13,368.1 ns	239.05 ns	211.91 ns	4.1656	34952 B
'new TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	1024	512	584.4 ns	10.15 ns	9.00 ns	0.2317	1944 B
'old truncate via EnumerateRunesToChars'	Job-OOTPKI	.NET 8.0	MostlySurrogates	1024	512	15,874.9 ns	213.65 ns	199.85 ns	4.1656	34952 B
'new TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	MostlySurrogates	1024	512	592.7 ns	11.31 ns	10.58 ns	0.2317	1944 B

Method	Job	Toolchain	Kind	RuneLength	Mean	Error	StdDev	Median	Gen0	Allocated
'old Count() over EnumerateRunesToChars'	Job-JMDAGQ	.NET 10.0	Ascii	128	619.63 ns	11.920 ns	11.707 ns	620.95 ns	0.5035	4216 B
'new CountRunes(span)'	Job-JMDAGQ	.NET 10.0	Ascii	128	64.97 ns	0.332 ns	0.294 ns	64.97 ns	-	-
'old Count() over EnumerateRunesToChars'	Job-OOTPKI	.NET 8.0	Ascii	128	754.45 ns	14.865 ns	31.678 ns	745.93 ns	0.5035	4216 B
'new CountRunes(span)'	Job-OOTPKI	.NET 8.0	Ascii	128	66.31 ns	0.209 ns	0.196 ns	66.30 ns	-	-
'old Count() over EnumerateRunesToChars'	Job-JMDAGQ	.NET 10.0	Ascii	8192	35,601.63 ns	693.533 ns	1,886.808 ns	34,675.31 ns	31.3110	262264 B
'new CountRunes(span)'	Job-JMDAGQ	.NET 10.0	Ascii	8192	3,909.67 ns	23.210 ns	21.711 ns	3,901.30 ns	-	-
'old Count() over EnumerateRunesToChars'	Job-OOTPKI	.NET 8.0	Ascii	8192	46,619.68 ns	920.902 ns	1,752.112 ns	46,408.94 ns	31.3110	262264 B
'new CountRunes(span)'	Job-OOTPKI	.NET 8.0	Ascii	8192	3,924.67 ns	15.360 ns	14.368 ns	3,921.15 ns	-	-
'old Count() over EnumerateRunesToChars'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	128	649.58 ns	11.920 ns	11.150 ns	651.50 ns	0.5035	4216 B
'new CountRunes(span)'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	128	74.12 ns	1.125 ns	0.939 ns	74.00 ns	-	-
'old Count() over EnumerateRunesToChars'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	128	745.95 ns	14.848 ns	14.583 ns	749.10 ns	0.5035	4216 B
'new CountRunes(span)'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	128	81.77 ns	0.479 ns	0.374 ns	81.83 ns	-	-
'old Count() over EnumerateRunesToChars'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	8192	38,241.41 ns	592.292 ns	462.423 ns	38,313.08 ns	31.3110	262264 B
'new CountRunes(span)'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	8192	4,373.03 ns	11.984 ns	10.623 ns	4,372.00 ns	-	-
'old Count() over EnumerateRunesToChars'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	8192	45,407.27 ns	876.842 ns	1,140.142 ns	45,305.08 ns	31.3110	262264 B
'new CountRunes(span)'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	8192	4,841.84 ns	13.875 ns	12.300 ns	4,844.33 ns	-	-
'old Count() over EnumerateRunesToChars'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	128	715.61 ns	13.934 ns	12.352 ns	718.27 ns	0.5035	4216 B
'new CountRunes(span)'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	128	92.80 ns	0.554 ns	0.492 ns	92.63 ns	-	-
'old Count() over EnumerateRunesToChars'	Job-OOTPKI	.NET 8.0	MostlySurrogates	128	814.53 ns	16.191 ns	31.579 ns	796.44 ns	0.5035	4216 B
'new CountRunes(span)'	Job-OOTPKI	.NET 8.0	MostlySurrogates	128	97.37 ns	0.291 ns	0.258 ns	97.33 ns	-	-
'old Count() over EnumerateRunesToChars'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	8192	43,324.08 ns	835.526 ns	781.551 ns	43,488.72 ns	31.3110	262264 B
'new CountRunes(span)'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	8192	5,585.16 ns	25.642 ns	21.412 ns	5,584.12 ns	-	-
'old Count() over EnumerateRunesToChars'	Job-OOTPKI	.NET 8.0	MostlySurrogates	8192	50,161.87 ns	1,000.371 ns	1,466.331 ns	50,378.08 ns	31.3110	262264 B
'new CountRunes(span)'	Job-OOTPKI	.NET 8.0	MostlySurrogates	8192	5,831.10 ns	30.611 ns	27.135 ns	5,827.66 ns	-	-

Added SIMD search and early bailout:

Added SIMD search:

Method	Job	Toolchain	Kind	RuneLength	MaxRuneCount	Mean	Error	StdDev	Median	Ratio	RatioSD	Gen0	Allocated	Alloc Ratio
'prev TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	Ascii	128	512	117.83 ns	3.247 ns	9.472 ns	118.01 ns	1.01	0.11	0.0334	280 B	1.00
'new TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	Ascii	128	512	20.53 ns	1.192 ns	3.458 ns	21.20 ns	0.18	0.03	0.0335	280 B	1.00

'prev TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	Ascii	128	512	113.01 ns	2.309 ns	5.836 ns	112.96 ns	1.00	0.07	0.0334	280 B	1.00
'new TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	Ascii	128	512	17.22 ns	0.272 ns	0.302 ns	17.14 ns	0.15	0.01	0.0335	280 B	1.00

'prev TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	Ascii	1024	512	356.61 ns	4.256 ns	3.772 ns	356.42 ns	1.00	0.01	0.1249	1048 B	1.00
'new TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	Ascii	1024	512	58.19 ns	1.418 ns	4.024 ns	57.35 ns	0.16	0.01	0.1253	1048 B	1.00

'prev TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	Ascii	1024	512	447.18 ns	8.996 ns	23.540 ns	454.22 ns	1.00	0.08	0.1249	1048 B	1.00
'new TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	Ascii	1024	512	79.19 ns	5.037 ns	14.853 ns	77.34 ns	0.18	0.03	0.1253	1048 B	1.00

'prev TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	128	512	128.13 ns	3.666 ns	10.808 ns	126.82 ns	1.01	0.12	0.0410	344 B	1.00
'new TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	128	512	16.93 ns	0.387 ns	0.791 ns	16.80 ns	0.13	0.01	0.0411	344 B	1.00

'prev TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	128	512	121.79 ns	2.492 ns	5.523 ns	120.67 ns	1.00	0.06	0.0410	344 B	1.00
'new TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	128	512	18.89 ns	0.391 ns	0.858 ns	18.66 ns	0.16	0.01	0.0411	344 B	1.00

'prev TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	1024	512	436.43 ns	8.777 ns	10.449 ns	439.27 ns	1.00	0.03	0.1554	1304 B	1.00
'new TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	1024	512	376.56 ns	7.524 ns	14.675 ns	374.07 ns	0.86	0.04	0.1554	1304 B	1.00

'prev TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	1024	512	422.26 ns	5.899 ns	5.229 ns	423.12 ns	1.00	0.02	0.1554	1304 B	1.00
'new TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	1024	512	393.42 ns	5.567 ns	4.649 ns	392.34 ns	0.93	0.02	0.1554	1304 B	1.00

'prev TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	128	512	150.52 ns	2.176 ns	1.817 ns	150.22 ns	1.00	0.02	0.0601	504 B	1.00
'new TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	128	512	21.68 ns	0.482 ns	1.296 ns	20.99 ns	0.14	0.01	0.0602	504 B	1.00

'prev TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	MostlySurrogates	128	512	154.18 ns	3.114 ns	6.361 ns	155.56 ns	1.00	0.06	0.0601	504 B	1.00
'new TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	MostlySurrogates	128	512	23.86 ns	0.502 ns	1.390 ns	23.22 ns	0.16	0.01	0.0602	504 B	1.00

'prev TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	1024	512	556.12 ns	10.914 ns	11.208 ns	556.83 ns	1.00	0.03	0.2317	1944 B	1.00
'new TruncateStringToRuneCount().ToString()'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	1024	512	492.66 ns	9.859 ns	9.222 ns	490.17 ns	0.89	0.02	0.2317	1944 B	1.00

'prev TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	MostlySurrogates	1024	512	545.49 ns	8.397 ns	7.444 ns	544.45 ns	1.00	0.02	0.2317	1944 B	1.00
'new TruncateStringToRuneCount().ToString()'	Job-OOTPKI	.NET 8.0	MostlySurrogates	1024	512	557.46 ns	10.655 ns	10.464 ns	556.98 ns	1.02	0.02	0.2317	1944 B	1.00

Method	Job	Toolchain	Kind	RuneLength	Mean	Error	StdDev	Ratio	RatioSD	Allocated	Alloc Ratio
'prev CountRunes(span)'	Job-JMDAGQ	.NET 10.0	Ascii	128	70.216 ns	1.3830 ns	2.3484 ns	1.00	0.05	-	NA
'new CountRunes(span)'	Job-JMDAGQ	.NET 10.0	Ascii	128	4.904 ns	0.0343 ns	0.0321 ns	0.07	0.00	-	NA

'prev CountRunes(span)'	Job-OOTPKI	.NET 8.0	Ascii	128	68.014 ns	1.3878 ns	1.4849 ns	1.00	0.03	-	NA
'new CountRunes(span)'	Job-OOTPKI	.NET 8.0	Ascii	128	6.129 ns	0.0646 ns	0.0605 ns	0.09	0.00	-	NA

'prev CountRunes(span)'	Job-JMDAGQ	.NET 10.0	Ascii	8192	3,884.546 ns	31.2551 ns	29.2360 ns	1.00	0.01	-	NA
'new CountRunes(span)'	Job-JMDAGQ	.NET 10.0	Ascii	8192	254.202 ns	3.0534 ns	2.5497 ns	0.07	0.00	-	NA

'prev CountRunes(span)'	Job-OOTPKI	.NET 8.0	Ascii	8192	4,064.459 ns	42.3702 ns	37.5601 ns	1.00	0.01	-	NA
'new CountRunes(span)'	Job-OOTPKI	.NET 8.0	Ascii	8192	254.313 ns	4.4622 ns	4.1739 ns	0.06	0.00	-	NA

'prev CountRunes(span)'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	128	74.100 ns	0.8221 ns	0.7690 ns	1.00	0.01	-	NA
'new CountRunes(span)'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	128	77.034 ns	1.5091 ns	1.8533 ns	1.04	0.03	-	NA

'prev CountRunes(span)'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	128	85.025 ns	1.7147 ns	2.4037 ns	1.00	0.04	-	NA
'new CountRunes(span)'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	128	85.963 ns	0.7137 ns	0.5960 ns	1.01	0.03	-	NA

'prev CountRunes(span)'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	8192	4,396.650 ns	58.2950 ns	54.5292 ns	1.00	0.02	-	NA
'new CountRunes(span)'	Job-JMDAGQ	.NET 10.0	Mixed(...)gates [21]	8192	4,434.144 ns	22.8985 ns	21.4193 ns	1.01	0.01	-	NA

'prev CountRunes(span)'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	8192	4,904.013 ns	41.1963 ns	34.4008 ns	1.00	0.01	-	NA
'new CountRunes(span)'	Job-OOTPKI	.NET 8.0	Mixed(...)gates [21]	8192	4,822.738 ns	31.6198 ns	29.5771 ns	0.98	0.01	-	NA

'prev CountRunes(span)'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	128	94.261 ns	0.9110 ns	0.7607 ns	1.00	0.01	-	NA
'new CountRunes(span)'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	128	99.823 ns	1.4972 ns	1.4005 ns	1.06	0.02	-	NA

'prev CountRunes(span)'	Job-OOTPKI	.NET 8.0	MostlySurrogates	128	96.153 ns	0.3468 ns	0.3074 ns	1.00	0.00	-	NA
'new CountRunes(span)'	Job-OOTPKI	.NET 8.0	MostlySurrogates	128	101.584 ns	1.0409 ns	0.8692 ns	1.06	0.01	-	NA

'prev CountRunes(span)'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	8192	5,546.374 ns	25.6919 ns	21.4539 ns	1.00	0.01	-	NA
'new CountRunes(span)'	Job-JMDAGQ	.NET 10.0	MostlySurrogates	8192	5,574.675 ns	79.9365 ns	70.8616 ns	1.01	0.01	-	NA

'prev CountRunes(span)'	Job-OOTPKI	.NET 8.0	MostlySurrogates	8192	5,686.914 ns	37.1821 ns	31.0488 ns	1.00	0.01	-	NA
'new CountRunes(span)'	Job-OOTPKI	.NET 8.0	MostlySurrogates	8192	5,720.962 ns	76.7373 ns	71.7802 ns	1.01	0.01	-	NA

Synthetic benchmarks demonstrate order of magnitude (or two in case of BMP-only and AVX512 in theory) improvements for methods themselves, also count and span truncation itself are alloc-free now.

Practical benchmarks (3 int and 1 char100 columns, real I/O with fb3 server on localhost and nvme)

Master:

Method	Rows	Mean	Error	StdDev	Median	Gen0	Gen1	Allocated
SelectAndMap_Main_ReusedBufferAsync	10	1.796 ms	0.0649 ms	0.1904 ms	1.784 ms	-	-	457.27 KB
SelectAndMap_Main_ReusedBufferAsync	100	8.326 ms	0.5724 ms	1.5955 ms	7.472 ms	-	-	4502.13 KB
SelectAndMap_Main_ReusedBufferAsync	1000	31.037 ms	3.7512 ms	10.8231 ms	24.973 ms	5000.0000	1000.0000	44985.72 KB
SelectAndMap_Main_ReusedBufferAsync	10000	337.278 ms	16.5461 ms	48.7865 ms	334.254 ms	55000.0000	10000.0000	449543.01 KB
SelectAndMap_Main_ReusedBufferAsync	100000	3,467.848 ms	98.9785 ms	288.7249 ms	3,435.619 ms	550000.0000	114000.0000	4494685.62 KB

New:

Method	Rows	Mean	Error	StdDev	Gen0	Gen1	Allocated
SelectAndMap_Main_ReusedBufferAsync	10	676.7 us	32.22 us	93.99 us	-	-	59.62 KB
SelectAndMap_Main_ReusedBufferAsync	100	2,851.1 us	89.50 us	252.43 us	-	-	537.37 KB
SelectAndMap_Main_ReusedBufferAsync	1000	26,382.1 us	4,842.76 us	14,279.00 us	-	-	5145.7 KB
SelectAndMap_Main_ReusedBufferAsync	10000	265,738.7 us	19,378.44 us	56,833.63 us	6000.0000	1000.0000	51357.16 KB
SelectAndMap_Main_ReusedBufferAsync	100000	2,529,994.5 us	124,955.52 us	366,472.93 us	62000.0000	10000.0000	513368.48 KB

In practice differences are still noticiable, up to 3x in terms of speed, tenfold in memory volume and ~100x in allocation events reduction can be observed (profiling of real run, not in benchmark).

UPD: Fixed duplicated enumeration and found out, I somehow missed few places of old way of counting while splitting commits

fdcastel · 2026-03-23T04:15:27Z

Hey @pl752! Great work!

I’ve been working on a refactor for this project’s benchmarks on #1203

Do you think we could combine some of your benchmark changes with it?

I’d really appreciate any thoughts or suggestions you have 😄.

… leverage simd for BMP-only strings

pl752 · 2026-05-21T09:54:38Z

@fdcastel Hello, I am sorry that I haven't replied initially, I was busy and forgot about the notification. I unfortunately don't have any particular suggestions about benchmarks, because my tests are either written specific to my project queries or they are very local synthetic tests of the thing I was working with and not very representative. I appreciate your changes for benchmarks as currently there is a lack of convenient tools of performance assesment here.

pl752 · 2026-05-21T09:55:42Z

Also recent force push was due to addition of gpg signatures to my commits.

fdcastel · 2026-05-23T22:27:00Z

@pl752 two minor suggestions for this PR (found while investigating #1272):

After the PR, EnumerateRunesToChars (Extensions.cs) is dead code -- could be removed.
PR adds classic this ReadOnlySpan<char> extension methods; current master refactored Extensions.cs to C# extension(...) blocks.

pl752 · 2026-05-24T11:54:15Z

@fdcastel Thank you, applied your suggestions (new syntax and dead helper removal), I think PR is ready for review

This was referenced Dec 29, 2025
(Improvements) Ring-buffer and XdrReaderWriter optimizations, assorted Span/Memory method additions #1253
Open
(Improvements) Rune related and span-ish optimizations #1247
Closed

pl752 added 3 commits May 21, 2026 12:05

Reworked the rune operations to not spam char[1 or 2] allocations and…
bdc8ff7
… leverage simd for BMP-only strings

Fixed somehow skipped few remaining unoptimal counts
a7dc023

Removed necessity to count twice and allocate similar string
14d7707

pl752 force-pushed the rune_opt branch from 822b1a2 to 14d7707Compare May 21, 2026 07:08

pl752 mentioned this pull request May 21, 2026
Major performance degradation introduced with 10.3.3 (UTF8 char fetch) #1272
Open

fdcastel mentioned this pull request May 23, 2026
Refactor benchmarks #1203
Open

New ext syntax + removed dead helper
4e15ca7

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(Improvements) Rune operations optimization - #1252

(Improvements) Rune operations optimization#1252
pl752 wants to merge 4 commits into
FirebirdSQL:masterfrom
pl752:rune_opt

pl752 commented Dec 29, 2025•
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pl752 commented May 24, 2026•
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pl752 commented Dec 29, 2025•
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pl752 commented May 24, 2026•
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