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9 Commits

Author SHA1 Message Date
Changkun Ou d5a5a13ad9 sync: clarify the validity to call Map methods inside Range 
This change clarifies that calling all Map methods inside the callback
of Range is allowed. For further assurance, a nested range call test
is also added.

Fixes #46399

Change-Id: I0a766a5c1470e6b573ec35df1ccd62b2e46f1561
Reviewed-on: https://go-review.googlesource.com/c/go/+/337389
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Ian Lance Taylor <iant@golang.org>
 2021-11-11 04:41:56 +00:00
panchenglong01 1749f3915e sync: update misleading comment in map.go about entry type 
As discussed in: https://github.com/golang/go/issues/45429,  about entry
type comments, it is possible for p == nil when m.dirty != nil, so
update the commemt about it.

Fixes #45429

Change-Id: I7ef96ee5b6948df9ac736481d177a59ab66d7d4d
GitHub-Last-Rev: 202c598a0a
GitHub-Pull-Request: golang/go#45443
Reviewed-on: https://go-review.googlesource.com/c/go/+/308292
Reviewed-by: Changkun Ou <euryugasaki@gmail.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Trust: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
 2021-04-08 14:08:29 +00:00
Changkun Ou 94953d3e59 sync: delete dirty keys inside Map.LoadAndDelete 
Fixes #40999

Change-Id: Ie32427e5cb5ed512b976b554850f50be156ce9f2
Reviewed-on: https://go-review.googlesource.com/c/go/+/250197
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
 2020-08-24 20:05:41 +00:00
Changkun Ou 2e8dbae85c sync: add new Map method LoadAndDelete 
This CL implements a LoadAndDelete method in sync.Map. Benchmark:

name                                              time/op
LoadAndDeleteBalanced/*sync_test.RWMutexMap-12    98.8ns ± 1%
LoadAndDeleteBalanced/*sync.Map-12                10.3ns ±11%
LoadAndDeleteUnique/*sync_test.RWMutexMap-12      99.2ns ± 2%
LoadAndDeleteUnique/*sync.Map-12                  6.63ns ±10%
LoadAndDeleteCollision/*sync_test.DeepCopyMap-12   140ns ± 0%
LoadAndDeleteCollision/*sync_test.RWMutexMap-12   75.2ns ± 2%
LoadAndDeleteCollision/*sync.Map-12               5.21ns ± 5%

In addition, Delete is bounded and more efficient if many collisions:

DeleteCollision/*sync_test.DeepCopyMap-12   120ns ± 2%   125ns ± 1%   +3.80%  (p=0.000 n=10+9)
DeleteCollision/*sync_test.RWMutexMap-12   73.5ns ± 3%  79.5ns ± 1%   +8.03%  (p=0.000 n=10+9)
DeleteCollision/*sync.Map-12               97.8ns ± 3%   5.9ns ± 4%  -94.00%  (p=0.000 n=10+10)

Fixes #33762

Change-Id: Ic8469a7861d27ab0edeface0078aad8af9b26c2f
Reviewed-on: https://go-review.googlesource.com/c/go/+/205899
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2020-02-25 14:31:55 +00:00
Ian Lance Taylor 756c352963 sync: simplify (*entry).tryStore 
The only change to the go build -gcflags=-m=2 output was to remove
these two lines:

sync/map.go:178:26: &e.p escapes to heap
sync/map.go:178:26: 	from &e.p (passed to call[argument escapes]) at sync/map.go:178:25

Benchstat report for sync.Map benchmarks:

name                                            old time/op  new time/op  delta
LoadMostlyHits/*sync_test.DeepCopyMap-12        10.6ns ±11%  10.2ns ± 3%    ~     (p=0.299 n=10+8)
LoadMostlyHits/*sync_test.RWMutexMap-12         54.6ns ± 3%  54.6ns ± 2%    ~     (p=0.782 n=10+10)
LoadMostlyHits/*sync.Map-12                     10.1ns ± 1%  10.1ns ± 1%    ~     (p=1.127 n=10+8)
LoadMostlyMisses/*sync_test.DeepCopyMap-12      8.65ns ± 1%  8.77ns ± 5%  +1.39%  (p=0.017 n=9+10)
LoadMostlyMisses/*sync_test.RWMutexMap-12       53.6ns ± 2%  53.8ns ± 2%    ~     (p=0.408 n=10+9)
LoadMostlyMisses/*sync.Map-12                   7.37ns ± 1%  7.46ns ± 1%  +1.19%  (p=0.000 n=9+10)
LoadOrStoreBalanced/*sync_test.RWMutexMap-12     895ns ± 4%   906ns ± 3%    ~     (p=0.203 n=9+10)
LoadOrStoreBalanced/*sync.Map-12                 872ns ±10%   804ns ±12%  -7.75%  (p=0.014 n=10+10)
LoadOrStoreUnique/*sync_test.RWMutexMap-12      1.29µs ± 2%  1.28µs ± 1%    ~     (p=0.586 n=10+9)
LoadOrStoreUnique/*sync.Map-12                  1.30µs ± 7%  1.40µs ± 2%  +6.95%  (p=0.000 n=9+10)
LoadOrStoreCollision/*sync_test.DeepCopyMap-12  6.98ns ± 1%  6.91ns ± 1%  -1.10%  (p=0.000 n=10+10)
LoadOrStoreCollision/*sync_test.RWMutexMap-12    371ns ± 1%   372ns ± 2%    ~     (p=0.679 n=9+9)
LoadOrStoreCollision/*sync.Map-12               5.49ns ± 1%  5.49ns ± 1%    ~     (p=0.732 n=9+10)
Range/*sync_test.DeepCopyMap-12                 2.49µs ± 1%  2.50µs ± 0%    ~     (p=0.148 n=10+10)
Range/*sync_test.RWMutexMap-12                  54.7µs ± 1%  54.6µs ± 3%    ~     (p=0.549 n=9+10)
Range/*sync.Map-12                              2.74µs ± 1%  2.76µs ± 1%  +0.68%  (p=0.011 n=10+8)
AdversarialAlloc/*sync_test.DeepCopyMap-12      2.52µs ± 5%  2.54µs ± 7%    ~     (p=0.225 n=10+10)
AdversarialAlloc/*sync_test.RWMutexMap-12        108ns ± 1%   107ns ± 1%    ~     (p=0.101 n=10+9)
AdversarialAlloc/*sync.Map-12                    712ns ± 2%   714ns ± 3%    ~     (p=0.984 n=8+10)
AdversarialDelete/*sync_test.DeepCopyMap-12      581ns ± 3%   578ns ± 3%    ~     (p=0.781 n=9+9)
AdversarialDelete/*sync_test.RWMutexMap-12       126ns ± 2%   126ns ± 1%    ~     (p=0.883 n=10+10)
AdversarialDelete/*sync.Map-12                   155ns ± 8%   158ns ± 2%    ~     (p=0.158 n=10+9)

Change-Id: I1ed8e3109baca03087d0fad3df769fc7e38f6dbb
Reviewed-on: https://go-review.googlesource.com/137441
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-09-27 21:44:20 +00:00
Russ Cox 3f150934e2 sync: document when and when not to use Map 
Fixes #21587.

Change-Id: I47eb181d65da67a3b530c7f8acac9c0c619ea474
Reviewed-on: https://go-review.googlesource.com/83796
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
 2018-01-04 20:13:20 +00:00
Brad Fitzpatrick 5f7a03e148 sync: delete a sentence from the Map docs 
From Josh's comments on https://golang.org/cl/50310

Once I removed the "from the Go standard library" bit, the beginning
wasn't worth keeping. It also wasn't clear whether what it meant by
"cache contention". Processor caches, or user-level caches built with
sync.Map? It didn't seem worth clarifying and didn't convey any useful
information, so deleted.

Change-Id: Id1d76105a3081d0855f6a64540700932bb83d98e
Reviewed-on: https://go-review.googlesource.com/50632
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
 2017-07-21 22:00:47 +00:00
Michael Stapelberg ace7ce1025 sync: update Map documentation with usage rule of thumb 
As per bcmills’s lightning talk at GopherCon 2017:
https://github.com/gophercon/2017-talks/tree/master/lightningtalks/BryanCMills-AnOverviewOfSyncMap

Change-Id: I12dd0daa608af175d110298780f32c6dc5e1e0a0
Reviewed-on: https://go-review.googlesource.com/50310
Reviewed-by: Bryan Mills <bcmills@google.com>
 2017-07-21 16:02:43 +00:00
Bryan C. Mills 959025c0ac sync: import Map from x/sync/syncmap 
This is a direct port of the version from
commit a60ad46e0ed33d02e09bda439efaf9c9727dbc6c
(https://go-review.googlesource.com/c/37342/).

updates #17973
updates #18177

Change-Id: I63fa5ef6951b1edd39f84927d1181a4df9b15385
Reviewed-on: https://go-review.googlesource.com/36617
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 2017-04-26 18:05:06 +00:00