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https://github.com/scylladb/scylladb.git
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0291a4491e
"This patchset restricts background writers - such as compactions,
streaming flushes and memtable flushes to a maximum amount of CPU usage
through a seastar::thread_scheduling_group.
The said maximum is recommended to be set 50 % - it is default
disabled, but can be adjusted through a configuration option until we
are able to auto-tune this.
The second patch in this series provides a preview on how such auto-tune
would look like. By implementing a simple controller we automatically
adjust the quota for the memtable writer processes, so that the rate at
which bytes come in is equal to the rates at which bytes are flushed.
Tail latencies are greatly reduced by this series, and heavy spikes that
previously appeared on CPU-bound workloads are no more."
* 'memtable-controller-v5' of https://github.com/glommer/scylla:
simple controller for memtable/streaming writer shares.
restrict background writers to 50 % of CPU.
(cherry picked from commit c5ee62a6a4)
42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
/*
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* Copyright (C) 2017 ScyllaDB
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*
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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// Glue logic for writing memtables to sstables
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#pragma once
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#include "memtable.hh"
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#include "sstables/sstables.hh"
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#include <seastar/core/future.hh>
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#include <seastar/core/file.hh>
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#include <seastar/core/thread.hh>
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future<>
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write_memtable_to_sstable(memtable& mt,
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sstables::shared_sstable sst,
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bool backup = false,
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const io_priority_class& pc = default_priority_class(),
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bool leave_unsealed = false,
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seastar::thread_scheduling_group* tsg = nullptr);
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