ydb/util/datetime, branch meta-1.0.3-dev2

port util to freebsd, again

2025-07-10T17:03:28Z

``` [pg@arc ~]$ ./util-ut <----- TSaveLoadTest [exec] TSaveLoadTest::TestSaveLoad... [good] TSaveLoadTest::TestSaveLoad [exec] TSaveLoadTest::TestSaveLoadEmptyStruct... [good] TSaveLoadTest::TestSaveLoadEmptyStruct [exec] TSaveLoadTest::TestNewStyle... [good] TSaveLoadTest::TestNewStyle [exec] TSaveLoadTest::TestNewNewStyle... [good] TSaveLoadTest::TestNewNewStyle [exec] TSaveLoadTest::TestList... [good] TSaveLoadTest::TestList [exec] TSaveLoadTest::TestTuple... [good] TSaveLoadTest::TestTuple [exec] TSaveLoadTest::TestVariant... [good] TSaveLoadTest::TestVariant [exec] TSaveLoadTest::TestOptional... [good] TSaveLoadTest::TestOptional [exec] TSaveLoadTest::TestInheritNonVirtualClass... [good] TSaveLoadTest::TestInheritNonVirtualClass [exec] TSaveLoadTest::TestInheritVirtualClass... [good] TSaveLoadTest::TestInheritVirtualClass -----> TSaveLoadTest -> ok: 10 [DONE] ok: 10 [pg@arc ~]$ uname -a FreeBSD arc.freebsd.devtools 14.2-RELEASE-p1 FreeBSD 14.2-RELEASE-p1 GENERIC amd64 [pg@arc ~]$ ``` commit_hash:229d8aa6c8ccce1376d152a833fe8bf7c5faa3bd

[util] Obtain uptime from the clock_gettime syscall

2025-05-30T23:15:51Z

Reading /proc/uptime is about a hundred times slower than accessing the same timer via the clock_gettime call. The latter also has better precision. commit_hash:70904860adc43c9d2d6487a415a2e6b27fe6dae7

Update Cython to 3.0.10.

2025-05-19T04:36:02Z

commit_hash:b43c96b868cd36d636192fd2c6024d9f0d2fb6f8

[util] getting rid of LUT in DayOfYearToMonth

2025-02-27T20:53:09Z

commit_hash:9ec33d0cbe2da6aeea6e8d02fdaed5f45b6e3534

Intermediate changes

2025-02-24T16:44:33Z

commit_hash:ec09e953e6ed7b89ab18dfdac86961de36b5b2ea

[util] speedup GmTimeR outside LUT interval

2025-02-18T04:41:34Z

commit_hash:d57be220df393c193619ef5ed129ec4436540629

Intermediate changes

2025-02-11T13:15:59Z

commit_hash:f3acde65f4eb25503f414d5262f52b496123bd96

[util] GmTimeR: use LUT for the tm_yday -> tm_mday conversion

2025-02-10T21:10:29Z

Replacing binary search with a look-up table. The performance of which does not depend on the branch predictor, and conversion works equally fast for any dates. commit_hash:fefe9665d0d4b51c2ae09ec2b2816aed30caa57b

[util] GmTimeR: speedup a bit

2025-02-10T20:57:24Z

perf before ``` ------------------------------------------------------------------------------- Benchmark Time CPU Iterations ------------------------------------------------------------------------------- BM_GmTimeR 3.61 ns 3.61 ns 194952699 BM_GmTimeRRandom/last_hour 5.04 ns 5.04 ns 136121940 BM_GmTimeRRandom/last_day 5.03 ns 5.03 ns 139883239 BM_GmTimeRRandom/last_month 8.03 ns 8.03 ns 87839823 BM_GmTimeRRandom/last_year 14.9 ns 14.9 ns 46401773 BM_GmTimeRRandom/last_decade 16.9 ns 16.9 ns 41439312 BM_GmTimeRRandom/last_half_centry 16.9 ns 16.9 ns 41225553 ``` perf after ``` ------------------------------------------------------------------------------- Benchmark Time CPU Iterations ------------------------------------------------------------------------------- BM_GmTimeR 3.27 ns 3.27 ns 215390890 BM_GmTimeRRandom/last_hour 4.52 ns 4.52 ns 154869504 BM_GmTimeRRandom/last_day 4.53 ns 4.53 ns 155409964 BM_GmTimeRRandom/last_month 7.24 ns 7.24 ns 96972146 BM_GmTimeRRandom/last_year 13.5 ns 13.5 ns 51957829 BM_GmTimeRRandom/last_decade 15.5 ns 15.5 ns 45192135 BM_GmTimeRRandom/last_half_centry 15.4 ns 15.4 ns 45526906 ``` commit_hash:ac9db56d93a25c3a3018cfbb6bc5800da3d001ee

GmTimeR x2 speedup

2025-02-07T22:23:36Z

performance comparison againt standard gmtime\_r ``` ------------------------------------------------------------------------------- Benchmark Time CPU Iterations ------------------------------------------------------------------------------- BM_GmTimeR 3.66 ns 3.66 ns 189855900 BM_gmtime_r 18.7 ns 18.7 ns 37340999 BM_GmTimeRRandom/last_hour 5.12 ns 5.12 ns 136126173 BM_gmtime_r_Random/last_hour 19.2 ns 19.2 ns 36556971 BM_GmTimeRRandom/last_day 5.10 ns 5.10 ns 138257644 BM_gmtime_r_Random/last_day 19.2 ns 19.2 ns 37025160 BM_GmTimeRRandom/last_month 7.10 ns 7.10 ns 98235494 BM_gmtime_r_Random/last_month 20.4 ns 20.4 ns 34637975 BM_GmTimeRRandom/last_year 15.0 ns 15.0 ns 46664304 BM_gmtime_r_Random/last_year 26.8 ns 26.8 ns 26135911 BM_GmTimeRRandom/last_decade 17.2 ns 17.2 ns 40105536 BM_gmtime_r_Random/last_decade 27.0 ns 27.0 ns 25817056 BM_GmTimeRRandom/last_half_centry 17.1 ns 17.0 ns 41066079 BM_gmtime_r_Random/last_half_century 26.8 ns 26.7 ns 26215076 ``` commit_hash:33747760ad46412f50fe3cb06f4c438794a44492