3 Commits (a9b1e3f9e8f3381ef7da326993d48d5110f99576)

Author	SHA1	Message	Date
David Anderson	b925e18f70	tstime: hand-implement parseInt for specific needs of rfc3339 parsing. ... Makes parsing 4.6x faster. name old time/op new time/op delta ParseInt-12 32.1ns ± 1% 6.9ns ± 2% -78.55% (p=0.000 n=10+9) Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
Brad Fitzpatrick	febdac0499	tstime: write Parse3339 parse that doesn't use time.Parse ... It doesn't allocate and it's half the time of time.Parse (which allocates), and 2/3rds the time of time.ParseInLocation (which doesn't). Go with a UTC time: BenchmarkGoParse3339/Z-8 2200995 534 ns/op 0 B/op 0 allocs/op BenchmarkGoParse3339/Z-8 2254816 554 ns/op 0 B/op 0 allocs/op BenchmarkGoParse3339/Z-8 2159504 522 ns/op 0 B/op 0 allocs/op Go allocates with a "-08:00" suffix instead of ending in "Z": BenchmarkGoParse3339/TZ-8 1276491 884 ns/op 144 B/op 3 allocs/op BenchmarkGoParse3339/TZ-8 1355858 942 ns/op 144 B/op 3 allocs/op BenchmarkGoParse3339/TZ-8 1385484 911 ns/op 144 B/op 3 allocs/op Go doesn't allocate if you use time.ParseInLocation, but then you need to parse the string to find the location anyway, so might as well go all the way (below). BenchmarkGoParse3339InLocation-8 1912254 597 ns/op 0 B/op 0 allocs/op BenchmarkGoParse3339InLocation-8 1980043 612 ns/op 0 B/op 0 allocs/op BenchmarkGoParse3339InLocation-8 1891366 612 ns/op 0 B/op 0 allocs/op Parsing RFC3339 ourselves, UTC: BenchmarkParse3339/Z-8 3889220 307 ns/op 0 B/op 0 allocs/op BenchmarkParse3339/Z-8 3718500 309 ns/op 0 B/op 0 allocs/op BenchmarkParse3339/Z-8 3621231 303 ns/op 0 B/op 0 allocs/op Parsing RFC3339 ourselves, with timezone (w/ *time.Location fetched from sync.Map) BenchmarkParse3339/TZ-8 3019612 418 ns/op 0 B/op 0 allocs/op BenchmarkParse3339/TZ-8 2921618 401 ns/op 0 B/op 0 allocs/op BenchmarkParse3339/TZ-8 3031671 408 ns/op 0 B/op 0 allocs/op Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	d503dee6f1	tstime: add new package for time utilities, starting with Parse3339 ... Go's time.Parse always allocates a FixedZone for time strings not in UTC (ending in "Z"). This avoids that allocation, at the cost of adding a cache. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago