Commit Graph

9 Commits

Author SHA1 Message Date
Joe Tsai 7732377cd7
tstime/rate: implement Value.{Marshal,Unmarshal}JSON (#8481)
Implement support for marshaling and unmarshaling a Value.

Updates tailscale/corp#8427

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2024-01-16 13:48:34 -08:00
Andrew Lytvynov 1302bd1181
all: cleanup unused code, part 1 (#10661)
Run `staticcheck` with `U1000` to find unused code. This cleans up about
a half of it. I'll do the other half separately to keep PRs manageable.

Updates #cleanup

Signed-off-by: Andrew Lytvynov <awly@tailscale.com>
2023-12-20 14:50:30 -08:00
Joe Tsai 87b4bbb94f
tstime/rate: add Value (#7491)
Add Value, which measures the rate at which an event occurs,
exponentially weighted towards recent activity.
It is guaranteed to occupy O(1) memory, operate in O(1) runtime,
and is safe for concurrent use.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2023-03-09 11:13:09 -08:00
Will Norris 71029cea2d all: update copyright and license headers
This updates all source files to use a new standard header for copyright
and license declaration.  Notably, copyright no longer includes a date,
and we now use the standard SPDX-License-Identifier header.

This commit was done almost entirely mechanically with perl, and then
some minimal manual fixes.

Updates #6865

Signed-off-by: Will Norris <will@tailscale.com>
2023-01-27 15:36:29 -08:00
Brad Fitzpatrick da8def8e13 all: remove old +build tags
The //go:build syntax was introduced in Go 1.17:

https://go.dev/doc/go1.17#build-lines

gofmt has kept the +build and go:build lines in sync since
then, but enough time has passed. Time to remove them.

Done with:

    perl -i -npe 's,^// \+build.*\n,,' $(git grep -l -F '+build')

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-11-04 07:25:42 -07:00
Brad Fitzpatrick 6a2e94cbeb tstime/rate: deflake TestLongRunningQPS even more
Previous de-flakings:
* 8cf1af8a07 for #3733
* 30458c71c8 for #2727

Fixes #4044

Change-Id: I506cf1ff37bb224f5a9929f1998901e60b24535d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-02-28 20:22:16 -08:00
Josh Bleecher Snyder 8cf1af8a07 tstime/rate: deflake TestLongRunningQPS
This test set the bar too high.
Just a couple of missed timers was enough to fail.
Change the test to more of a sanity check.
While we're here, run it for just 1s instead of 5s.

Prior to this change, on a 13" M1 MPB, with

stress -p 512 ./rate.test -test.run=QPS

I saw 90%+ failures.

After this change, I'm at 30k runs with no failures yet.

Fixes #3733

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2022-01-13 16:48:29 -08:00
Joe Tsai 30458c71c8
tstime/rate: deflake TestLongRunningQPS
This test is highly dependent on the accuracy of OS timers.
Reduce the number of failures by decreasing the required
accuracy from 0.999 to 0.995.
Also, switch from repeated time.Sleep to using a time.Ticker
for improved accuracy.

Updates #2727

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2021-08-30 10:46:41 -07:00
Josh Bleecher Snyder 9da4181606 tstime/rate: new package
This is a simplified rate limiter geared for exactly our needs:
A fast, mono.Time-based rate limiter for use in tstun.
It was generated by stripping down the x/time/rate rate limiter
to just our needs and switching it to use mono.Time.

It removes one time.Now call per packet.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-07-29 12:56:58 -07:00