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| author | Kjell Winblad <[email protected]> | 2019-04-10 15:50:54 +0200 |
|---|---|---|
| committer | Kjell Winblad <[email protected]> | 2019-04-10 15:50:54 +0200 |
| commit | 3d712ffc9d08dad3a42ea988869eaef8cd99b53b (patch) | |
| tree | 25ce2b16b9f847088997b0d4e77af46dbb6d2d66 /erts/doc | |
| parent | 326c3cb70c1b37c794b781a42c50725766098810 (diff) | |
| parent | c5e9766712436bea2b91bccd062f66a3ad1841bb (diff) | |
| download | otp-3d712ffc9d08dad3a42ea988869eaef8cd99b53b.tar.gz otp-3d712ffc9d08dad3a42ea988869eaef8cd99b53b.tar.bz2 otp-3d712ffc9d08dad3a42ea988869eaef8cd99b53b.zip | |
Merge branch 'kjell/stdlib/ets_decentralized_counters/PR-2190/OTP-15623'
* kjell/stdlib/ets_decentralized_counters/PR-2190/OTP-15623:
Decentralized counters for ETS ordered_set with write_concurrency
Diffstat (limited to 'erts/doc')
| -rw-r--r-- | erts/doc/src/erl.xml | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml index 88ddb03e97..471d7caa5a 100644 --- a/erts/doc/src/erl.xml +++ b/erts/doc/src/erl.xml @@ -636,6 +636,29 @@ produces a crash dump. On Unix systems, sending an emulator process a <c>SIGUSR1</c> signal also forces a crash dump.</p> </item> + <tag><marker id="+dcg"/><c><![CDATA[+rg DecentralizedCounterGroupsLimit]]></c></tag> + <item> + <p>Limits the number of decentralized counter groups used by + decentralized counters optimized for update operations in the + Erlang runtime system. By default, the limit is 256.</p> + <p>When the number of schedulers is less than or equal to the + limit, each scheduler has its own group. When the + number of schedulers is larger than the groups limit, + schedulers share groups. Shared groups degrade + the performance for updating counters while many reader groups + degrade the performance for reading counters. So, the limit is a tradeoff + between performance for update operations and performance for + read operations. Each group consumes 64 bytes in each + counter.</p> + <p>Notice that a runtime system using decentralized + counter groups benefits from <seealso marker="#+sbt">binding + schedulers to logical processors</seealso>, as the groups are + distributed better between schedulers with this option.</p> + <p>This option only affects decentralized counters used for + the counters that are keeping track of the memory consumption + and the number of terms in ETS tables of type ordered_set with + the write_concurrency option activated.</p> + </item> <tag><marker id="+e"/><c><![CDATA[+e Number]]></c></tag> <item> <p>Sets the maximum number of ETS tables. This limit is |