47 lines
1.6 KiB
Go
47 lines
1.6 KiB
Go
// Copyright 2017-2021 DERO Project. All rights reserved.
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// Use of this source code in any form is governed by RESEARCH license.
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// license can be found in the LICENSE file.
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// GPG: 0F39 E425 8C65 3947 702A 8234 08B2 0360 A03A 9DE8
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//
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package main
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import "runtime"
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import "sync/atomic"
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import "golang.org/x/sys/unix"
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var processor int32
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// sets thread affinity to avoid cache collision and thread migration
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func threadaffinity() {
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var cpuset unix.CPUSet
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lock_on_cpu := atomic.AddInt32(&processor, 1)
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if lock_on_cpu >= int32(runtime.GOMAXPROCS(0)) { // threads are more than cpu, we do not know what to do
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return
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}
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cpuset.Zero()
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cpuset.Set(int(avoidHT(int(lock_on_cpu))))
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unix.SchedSetaffinity(0, &cpuset)
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}
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func avoidHT(i int) int {
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count := runtime.GOMAXPROCS(0)
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if i < count/2 {
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return i * 2
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} else {
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return (i-count/2)*2 + 1
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}
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}
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