Mercurial > hg > svcore
view base/StorageAdviser.cpp @ 956:d002827b5896
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author | Chris Cannam |
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date | Wed, 03 Sep 2014 09:46:01 +0100 |
parents | e802e550a1f2 |
children | cc27f35aa75c |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* Sonic Visualiser An audio file viewer and annotation editor. Centre for Digital Music, Queen Mary, University of London. This file copyright 2006 QMUL. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. See the file COPYING included with this distribution for more information. */ #include "StorageAdviser.h" #include "Exceptions.h" #include "TempDirectory.h" #include "system/System.h" #include <iostream> //#define DEBUG_STORAGE_ADVISER 1 long StorageAdviser::m_discPlanned = 0; long StorageAdviser::m_memoryPlanned = 0; StorageAdviser::Recommendation StorageAdviser::m_baseRecommendation = StorageAdviser::NoRecommendation; StorageAdviser::Recommendation StorageAdviser::recommend(Criteria criteria, int minimumSize, int maximumSize) { #ifdef DEBUG_STORAGE_ADVISER SVDEBUG << "StorageAdviser::recommend: Criteria " << criteria << ", minimumSize " << minimumSize << ", maximumSize " << maximumSize << endl; #endif if (m_baseRecommendation != NoRecommendation) { return m_baseRecommendation; // for now } QString path; try { path = TempDirectory::getInstance()->getPath(); } catch (std::exception e) { cerr << "StorageAdviser::recommend: ERROR: Failed to get temporary directory path: " << e.what() << endl; return Recommendation(UseMemory | ConserveSpace); } int discFree = GetDiscSpaceMBAvailable(path.toLocal8Bit()); int memoryFree, memoryTotal; GetRealMemoryMBAvailable(memoryFree, memoryTotal); if (discFree > m_discPlanned / 1024 + 1) { discFree -= m_discPlanned / 1024 + 1; } else if (discFree > 0) { // can also be -1 for unknown discFree = 0; } if (memoryFree > m_memoryPlanned / 1024 + 1) { memoryFree -= m_memoryPlanned / 1024 + 1; } else if (memoryFree > 0) { // can also be -1 for unknown memoryFree = 0; } #ifdef DEBUG_STORAGE_ADVISER cerr << "Disc space: " << discFree << ", memory free: " << memoryFree << ", memory total: " << memoryTotal << ", min " << minimumSize << ", max " << maximumSize << endl; #endif //!!! We have a potentially serious problem here if multiple //recommendations are made in advance of any of the resulting //allocations, as the allocations that have been recommended for //won't be taken into account in subsequent recommendations. enum StorageStatus { Unknown, Insufficient, Marginal, Sufficient }; StorageStatus memoryStatus = Unknown; StorageStatus discStatus = Unknown; int minmb = minimumSize / 1024 + 1; int maxmb = maximumSize / 1024 + 1; if (memoryFree == -1) memoryStatus = Unknown; else if (memoryFree < memoryTotal / 3) memoryStatus = Insufficient; else if (minmb > (memoryFree * 3) / 4) memoryStatus = Insufficient; else if (maxmb > (memoryFree * 3) / 4) memoryStatus = Marginal; else if (minmb > (memoryFree / 3)) memoryStatus = Marginal; else if (memoryTotal == -1 || minmb > (memoryTotal / 10)) memoryStatus = Marginal; else memoryStatus = Sufficient; if (discFree == -1) discStatus = Unknown; else if (minmb > (discFree * 3) / 4) discStatus = Insufficient; else if (maxmb > (discFree / 4)) discStatus = Marginal; else if (minmb > (discFree / 10)) discStatus = Marginal; else discStatus = Sufficient; #ifdef DEBUG_STORAGE_ADVISER cerr << "Memory status: " << memoryStatus << ", disc status " << discStatus << endl; #endif int recommendation = NoRecommendation; if (memoryStatus == Insufficient || memoryStatus == Unknown) { recommendation |= UseDisc; if (discStatus == Insufficient && minmb > discFree) { throw InsufficientDiscSpace(path, minmb, discFree); } if (discStatus == Insufficient || discStatus == Marginal) { recommendation |= ConserveSpace; } else if (discStatus == Unknown && !(criteria & PrecisionCritical)) { recommendation |= ConserveSpace; } else { recommendation |= UseAsMuchAsYouLike; } } else if (memoryStatus == Marginal) { if (((criteria & SpeedCritical) || (criteria & FrequentLookupLikely)) && !(criteria & PrecisionCritical) && !(criteria & LongRetentionLikely)) { // requirements suggest a preference for memory if (discStatus != Insufficient) { recommendation |= PreferMemory; } else { recommendation |= UseMemory; } recommendation |= ConserveSpace; } else { if (discStatus == Insufficient) { recommendation |= (UseMemory | ConserveSpace); } else if (discStatus == Marginal) { recommendation |= (PreferMemory | ConserveSpace); } else if (discStatus == Unknown) { recommendation |= (PreferDisc | ConserveSpace); } else { recommendation |= (UseDisc | UseAsMuchAsYouLike); } } } else { if (discStatus == Insufficient) { recommendation |= (UseMemory | ConserveSpace); } else if (discStatus != Sufficient) { recommendation |= (PreferMemory | ConserveSpace); } else { if ((criteria & SpeedCritical) || (criteria & FrequentLookupLikely)) { recommendation |= PreferMemory; if (criteria & PrecisionCritical) { recommendation |= UseAsMuchAsYouLike; } else { recommendation |= ConserveSpace; } } else { recommendation |= PreferDisc; recommendation |= UseAsMuchAsYouLike; } } } return Recommendation(recommendation); } void StorageAdviser::notifyPlannedAllocation(AllocationArea area, int size) { if (area == MemoryAllocation) m_memoryPlanned += size; else if (area == DiscAllocation) m_discPlanned += size; // cerr << "storage planned up: memory: " << m_memoryPlanned << ", disc " // << m_discPlanned << endl; } void StorageAdviser::notifyDoneAllocation(AllocationArea area, int size) { if (area == MemoryAllocation) { if (m_memoryPlanned > size) m_memoryPlanned -= size; else m_memoryPlanned = 0; } else if (area == DiscAllocation) { if (m_discPlanned > size) m_discPlanned -= size; else m_discPlanned = 0; } // cerr << "storage planned down: memory: " << m_memoryPlanned << ", disc " // << m_discPlanned << endl; } void StorageAdviser::setFixedRecommendation(Recommendation recommendation) { m_baseRecommendation = recommendation; }