// <copyright file="SparseSolverControl.cs" company="Math.NET">
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// Math.NET Numerics, part of the Math.NET Project
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// http://numerics.mathdotnet.com
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// http://github.com/mathnet/mathnet-numerics
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//
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// Copyright (c) 2009-2020 Math.NET
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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// </copyright>
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using System;
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namespace IStation.Numerics.Providers.SparseSolver
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{
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public static class SparseSolverControl
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{
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const string EnvVarSSProvider = "MathNetNumericsSSProvider";
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const string EnvVarSSProviderPath = "MathNetNumericsSSProviderPath";
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static ISparseSolverProvider _sparseSolverProvider;
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static readonly object StaticLock = new object();
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/// <summary>
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/// Gets or sets the sparse solver provider. Consider to use UseNativeMKL or UseManaged instead.
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/// </summary>
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/// <value>The linear algebra provider.</value>
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public static ISparseSolverProvider Provider
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{
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get
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{
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if (_sparseSolverProvider == null)
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{
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lock (StaticLock)
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{
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if (_sparseSolverProvider == null)
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{
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UseDefault();
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}
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}
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}
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return _sparseSolverProvider;
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}
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set
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{
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value.InitializeVerify();
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// only actually set if verification did not throw
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_sparseSolverProvider = value;
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}
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}
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/// <summary>
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/// Optional path to try to load native provider binaries from.
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/// If not set, Numerics will fall back to the environment variable
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/// `MathNetNumericsSSProviderPath` or the default probing paths.
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/// </summary>
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public static string HintPath { get; set; }
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public static ISparseSolverProvider CreateManaged()
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{
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return new Managed.ManagedSparseSolverProvider();
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}
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public static void UseManaged()
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{
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Provider = CreateManaged();
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}
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#if NATIVE
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public static ISparseSolverProvider CreateNativeMKL()
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{
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return new Mkl.MklSparseSolverProvider(GetCombinedHintPath());
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}
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public static void UseNativeMKL()
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{
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Provider = CreateNativeMKL();
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}
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public static bool TryUseNativeMKL()
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{
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return TryUse(CreateNativeMKL());
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}
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/// <summary>
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/// Try to use a native provider, if available.
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/// </summary>
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public static bool TryUseNative()
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{
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if (AppSwitches.DisableNativeProviders || AppSwitches.DisableNativeProviderProbing)
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{
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return false;
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}
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return TryUseNativeMKL();
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}
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#endif
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static bool TryUse(ISparseSolverProvider provider)
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{
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try
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{
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if (!provider.IsAvailable())
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{
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return false;
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}
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Provider = provider;
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return true;
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}
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catch
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{
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// intentionally swallow exceptions here - use the explicit variants if you're interested in why
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return false;
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}
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}
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/// <summary>
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/// Use the best provider available.
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/// </summary>
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public static void UseBest()
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{
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if (AppSwitches.DisableNativeProviders || AppSwitches.DisableNativeProviderProbing)
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{
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UseManaged();
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return;
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}
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#if NATIVE
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if (!TryUseNative())
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{
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UseManaged();
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}
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#else
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UseManaged();
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#endif
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}
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/// <summary>
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/// Use a specific provider if configured, e.g. using the
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/// "MathNetNumericsDSSProvider" environment variable,
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/// or fall back to the best provider.
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/// </summary>
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public static void UseDefault()
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{
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if (AppSwitches.DisableNativeProviders)
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{
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UseManaged();
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return;
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}
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#if NATIVE
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var value = Environment.GetEnvironmentVariable(EnvVarSSProvider);
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switch (value != null ? value.ToUpperInvariant() : string.Empty)
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{
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case "MKL":
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UseNativeMKL();
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break;
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default:
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UseBest();
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break;
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}
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#else
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UseBest();
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#endif
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}
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public static void FreeResources()
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{
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Provider.FreeResources();
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}
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static string GetCombinedHintPath()
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{
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if (!String.IsNullOrEmpty(HintPath))
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{
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return HintPath;
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}
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var value = Environment.GetEnvironmentVariable(EnvVarSSProviderPath);
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if (!String.IsNullOrEmpty(value))
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{
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return value;
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}
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return null;
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}
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}
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}
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