Piszę pewien program do przetwarzania dużych plików i chciałem spróbować poprawić wydajność tego progamu poprzez zrównoleglenie operacji odczytu i zapisu oraz przeliczania.
Jest plik A oraz plik B, każdy o tej samej wielkości. Program ma pliku P zapisać wynik operacji XOR dotychczasowej zawartości pliku A i pliku P. Ponieważ docelowo program ma pracować z dużymi plikami rzędu dziesiątek i setek GB, próby ładowania całej treści do pamięci nie mają sensu, więc program przetwarza dane kawałkami.
Na potrzeby testu, obliczanie XOR jest celowo wykonywane trzykrotnie, bo zależalo mi na tym, żeby ta czynność trwała gdzieś od 50 do 80% czasu odczytu lub zapisu kawałka. Pliki mają po 2GB, przeprowadziłem dwukrotnie test przy przetwarzaniu 32 kawałków po 64MB oraz 16 kawałków po 128MB. Za każdym razem pliki zostały przetworzone poprawnie, ja to kontrolowałem.
Natomiast nurtują mnie dwie sprawy:
- Program, na początku tworzy 6 tablic o wielkości jednego kawałka każda, w trakcie działania nie tworzy ani nie niszczy tablic. Chciałem spróbować dla wielkości kawałka 256MB, ale jak program zaalokował 5 tablic, to przy szóstej wywalił "std::bad_alloc". Cały komputer ma 4GB, jest Windows 8 64-bit, dodatkowo 700MB swapu, bezpośrednio przed uruchomieniem programu było zajęte ok. 25-30% według menedżera zadań. W tym przypadku teoretycznie powinno być możliwe zaalokowanie 6 tablic, czyli 1536MB, a nawet 1700MB licząc interfejs, pozostałe zmienne, kod itp. Dlaczego nie dało się tyle zaalokować pomimo wystarczającej ilości wolnej pamięci?
- Pliki A i P są fizycznie na różnych dyskach twardych, ale okazało się, że przy jednoczesnym odczycie tych plików, odczyt każdego pliku z osobna trwa dłużej niż odczyt tych plików jeden po drugim w jednym wątku. W porównaniu do pamięci RAM, transfer dysku jest bardzo powolny, więc skąd wynika to wydłużenie, pomimo, że pliki są na różnych dyskach, więc odczyt jeden po drugim, czy jednocześnie nie powinno wpływać na prędkość odczytu. Z czego wynika dłuższa operacja odczytu przy odczycie dwóch plików z dwóch różnych dysków? Gdyby oba pliki były na tym samym dysku, to przyczyna byłaby oczywista.
Program tworzę w QtCreator, który kompiluje za pomocą MinGW32, program buduję jako Release. Zamieszczam kod najważniejszej klasy i wynik testu. Procedura, którą należy uruchomić, to TestProc(). Czasy wyświetlone na ekranie to czasy w milisekundach dla poszczególnych czynności i czas w milisekundach dla całości. W kodzie jest rozpisana kolejność operacji w czasie dla danych składających się z 4 kawałków. Znak ' w tym opisie oznacza, że operację wykonuje się na buforze [1], a brak znaku ' oznacza, że operacje wykonuje się na buforze [0].
#ifndef APPCORE_H
#define APPCORE_H
#include <string>
#include <thread>
#include <fstream>
#include <iostream>
#include <QTime>
using namespace std;
typedef long long llong;
class AppCore
{
public:
AppCore();
~AppCore();
void TestProc();
void TestCalc(char * A, char * P, char * R, llong ChunkNr);
llong ChunkSize;
void ChunkRead(string FileName, llong ChunkNr, char * Buf);
void ChunkWrite(string FileName, llong ChunkNr, char * Buf);
};
#endif // APPCORE_H
#include "appcore.h"
AppCore::AppCore()
{
ChunkSize = 64 * 1024 * 1024;
}
AppCore::~AppCore()
{
}
///
/// \brief AppCore::ChunkRead - Odczyt elementu danych z pliku
/// \param FileName - Nazwa pliku
/// \param Offset - Numer elementu
/// \param Buf - Bufor
///
void AppCore::ChunkRead(string FileName, llong ChunkNr, char *Buf)
{
QTime T;
T.start();
fstream F(FileName.c_str(), ios::in|ios::binary);
F.seekg(ChunkNr * ChunkSize);
F.read(Buf, ChunkSize);
F.close();
cout << "Read chunk " << ChunkNr << " from " << FileName << ": " << T.elapsed() << endl;
}
///
/// \brief AppCore::ChunkWrite - Zapis elementu danych do pliku
/// \param FileName - Nazwa pliku
/// \param Offset - Numer elementu
/// \param Buf - Bufor
///
void AppCore::ChunkWrite(string FileName, llong ChunkNr, char *Buf)
{
QTime T;
T.start();
fstream F(FileName.c_str(), ios::in|ios::out|ios::binary);
F.seekp(ChunkNr * ChunkSize);
F.write(Buf, ChunkSize);
F.close();
cout << "Write chunk " << ChunkNr << " to " << FileName << ": " << T.elapsed() << endl;
}
///
/// \brief AppCore::TestCalc - Operacje na elemencie
/// \param A - Element A jako dana
/// \param P - Element P jako dana
/// \param Res - Element P jako rezultat w osobnej instancji
///
void AppCore::TestCalc(char *A, char *P, char *R, llong ChunkNr)
{
QTime T;
T.start();
for (llong I = 0; I <= ChunkSize; I++)
{
R[I] = A[I] ^ P[I];
}
for (llong I = 0; I <= ChunkSize; I++)
{
R[I] = A[I] ^ P[I];
}
for (llong I = 0; I <= ChunkSize; I++)
{
R[I] = A[I] ^ P[I];
}
cout << "Process chunk " << ChunkNr << ": " << T.elapsed() << endl;
}
void AppCore::TestProc()
{
cout << "START" << endl;
string FA = "G:\\A.dat";
string FP = "D:\\P.dat";
llong ChunkQuan = 32;
llong ChunkQuan1 = ChunkQuan - 1;
int AlternateBuf;
char ** BufA = new char*[2];
char ** BufP = new char*[2];
char ** BufR = new char*[2];
BufA[0] = new char[ChunkSize];
BufP[0] = new char[ChunkSize];
BufR[0] = new char[ChunkSize];
BufA[1] = new char[ChunkSize];
BufP[1] = new char[ChunkSize];
BufR[1] = new char[ChunkSize];
cout << "Wersja bez watkow intuicyjna" << endl;
// Calc [ C0 | C1 | C2 | C3 ]
// DataA [R0 |R1 |R2 |R3 ]
// DataP [ R0 W0 | R1 W1 | R2 W2 | R3 W3 ]
QTime TotalTime;
TotalTime.start();
for (int I = 0; I < ChunkQuan; I++)
{
ChunkRead(FA, I, BufA[0]);
ChunkRead(FP, I, BufP[0]);
TestCalc(BufA[0], BufP[0], BufR[0], I);
ChunkWrite(FP, I, BufR[0]);
}
cout << "Total time: " << TotalTime.elapsed() << endl << endl;
cout << "Wersja bez watkow symulujaca wersje z watkami" << endl;
// Calc [ C0 | C1' | C2 | C3' | ]
// DataA [R0 |R1' |R2 |R3' | ]
// DataP [ R0 | R1' W0 | R2 W1'| R3' W2 |W3']
TotalTime.restart();
ChunkRead(FA, 0, BufA[0]);
ChunkRead(FP, 0, BufP[0]);
TestCalc(BufA[0], BufP[0], BufR[0], 0);
AlternateBuf = 1;
for (llong I = 1; I < ChunkQuan; I++)
{
ChunkRead(FA, I, BufA[AlternateBuf]);
ChunkRead(FP, I, BufP[AlternateBuf]);
TestCalc(BufA[AlternateBuf], BufP[AlternateBuf], BufR[AlternateBuf], I);
ChunkWrite(FP, I - 1, BufR[1 - AlternateBuf]);
AlternateBuf = 1 - AlternateBuf;
}
ChunkWrite(FP, ChunkQuan1, BufR[1 - AlternateBuf]);
cout << "Total time: " << TotalTime.elapsed() << endl << endl;
cout << "Wersja z watkami" << endl;
// Calc [ C0 | C1'| C2 | C3'| ]
// DataA [R0 |R1' |R2 |R3' | ]
// DataP [R0 |R1'W0 |R2 W1'|R3'W2 |W3']
TotalTime.restart();
thread Thr1Pre(&AppCore::ChunkRead, this, FA, 0, BufA[0]);
thread Thr2Pre(&AppCore::ChunkRead, this, FP, 0, BufP[0]);
Thr1Pre.join();
Thr2Pre.join();
thread Thr3Pre(&AppCore::TestCalc, this, BufA[0], BufP[0], BufR[0], 0);
Thr3Pre.join();
AlternateBuf = 1;
for (llong I = 1; I < ChunkQuan; I++)
{
thread Thr1Loop(&AppCore::ChunkRead, this, FA, I, BufA[AlternateBuf]);
thread Thr2Loop(&AppCore::ChunkRead, this, FP, I, BufP[AlternateBuf]);
Thr1Loop.join();
Thr2Loop.join();
thread Thr3Loop(&AppCore::TestCalc, this, BufA[AlternateBuf], BufP[AlternateBuf], BufR[AlternateBuf], I);
thread Thr4Loop(&AppCore::ChunkWrite, this, FP, I - 1, BufR[1 - AlternateBuf]);
Thr3Loop.join();
Thr4Loop.join();
AlternateBuf = 1 - AlternateBuf;
}
thread Thr1Post(&AppCore::ChunkWrite, this, FP, ChunkQuan1, BufR[1 - AlternateBuf]);
Thr1Post.join();
cout << "Total time: " << TotalTime.elapsed() << endl << endl;
delete[] BufA[0];
delete[] BufP[0];
delete[] BufR[0];
delete[] BufA[1];
delete[] BufP[1];
delete[] BufR[1];
delete[] BufA;
delete[] BufP;
delete[] BufR;
cout << "STOP" << endl;
}
START
Wersja bez watkow intuicyjna
Read chunk 0 from G:\A.dat: 1205
Read chunk 0 from D:\P.dat: 713
Process chunk 0: 456
Write chunk 0 to D:\P.dat: 592
Read chunk 1 from G:\A.dat: 884
Read chunk 1 from D:\P.dat: 576
Process chunk 1: 426
Write chunk 1 to D:\P.dat: 564
Read chunk 2 from G:\A.dat: 1004
Read chunk 2 from D:\P.dat: 617
Process chunk 2: 427
Write chunk 2 to D:\P.dat: 561
Read chunk 3 from G:\A.dat: 1010
Read chunk 3 from D:\P.dat: 644
Process chunk 3: 426
Write chunk 3 to D:\P.dat: 584
Read chunk 4 from G:\A.dat: 998
Read chunk 4 from D:\P.dat: 803
Process chunk 4: 425
Write chunk 4 to D:\P.dat: 600
Read chunk 5 from G:\A.dat: 957
Read chunk 5 from D:\P.dat: 823
Process chunk 5: 425
Write chunk 5 to D:\P.dat: 597
Read chunk 6 from G:\A.dat: 989
Read chunk 6 from D:\P.dat: 677
Process chunk 6: 425
Write chunk 6 to D:\P.dat: 537
Read chunk 7 from G:\A.dat: 1009
Read chunk 7 from D:\P.dat: 724
Process chunk 7: 425
Write chunk 7 to D:\P.dat: 569
Read chunk 8 from G:\A.dat: 1035
Read chunk 8 from D:\P.dat: 745
Process chunk 8: 425
Write chunk 8 to D:\P.dat: 582
Read chunk 9 from G:\A.dat: 984
Read chunk 9 from D:\P.dat: 649
Process chunk 9: 425
Write chunk 9 to D:\P.dat: 579
Read chunk 10 from G:\A.dat: 951
Read chunk 10 from D:\P.dat: 535
Process chunk 10: 426
Write chunk 10 to D:\P.dat: 674
Read chunk 11 from G:\A.dat: 958
Read chunk 11 from D:\P.dat: 677
Process chunk 11: 426
Write chunk 11 to D:\P.dat: 519
Read chunk 12 from G:\A.dat: 992
Read chunk 12 from D:\P.dat: 799
Process chunk 12: 425
Write chunk 12 to D:\P.dat: 582
Read chunk 13 from G:\A.dat: 999
Read chunk 13 from D:\P.dat: 764
Process chunk 13: 426
Write chunk 13 to D:\P.dat: 607
Read chunk 14 from G:\A.dat: 996
Read chunk 14 from D:\P.dat: 1495
Process chunk 14: 426
Write chunk 14 to D:\P.dat: 565
Read chunk 15 from G:\A.dat: 1050
Read chunk 15 from D:\P.dat: 780
Process chunk 15: 426
Write chunk 15 to D:\P.dat: 570
Read chunk 16 from G:\A.dat: 1112
Read chunk 16 from D:\P.dat: 881
Process chunk 16: 426
Write chunk 16 to D:\P.dat: 706
Read chunk 17 from G:\A.dat: 1040
Read chunk 17 from D:\P.dat: 826
Process chunk 17: 425
Write chunk 17 to D:\P.dat: 558
Read chunk 18 from G:\A.dat: 994
Read chunk 18 from D:\P.dat: 770
Process chunk 18: 427
Write chunk 18 to D:\P.dat: 562
Read chunk 19 from G:\A.dat: 1024
Read chunk 19 from D:\P.dat: 804
Process chunk 19: 425
Write chunk 19 to D:\P.dat: 533
Read chunk 20 from G:\A.dat: 994
Read chunk 20 from D:\P.dat: 871
Process chunk 20: 426
Write chunk 20 to D:\P.dat: 574
Read chunk 21 from G:\A.dat: 1010
Read chunk 21 from D:\P.dat: 854
Process chunk 21: 426
Write chunk 21 to D:\P.dat: 663
Read chunk 22 from G:\A.dat: 1111
Read chunk 22 from D:\P.dat: 823
Process chunk 22: 426
Write chunk 22 to D:\P.dat: 609
Read chunk 23 from G:\A.dat: 1115
Read chunk 23 from D:\P.dat: 758
Process chunk 23: 425
Write chunk 23 to D:\P.dat: 539
Read chunk 24 from G:\A.dat: 906
Read chunk 24 from D:\P.dat: 851
Process chunk 24: 425
Write chunk 24 to D:\P.dat: 561
Read chunk 25 from G:\A.dat: 1018
Read chunk 25 from D:\P.dat: 859
Process chunk 25: 426
Write chunk 25 to D:\P.dat: 641
Read chunk 26 from G:\A.dat: 999
Read chunk 26 from D:\P.dat: 812
Process chunk 26: 426
Write chunk 26 to D:\P.dat: 544
Read chunk 27 from G:\A.dat: 1039
Read chunk 27 from D:\P.dat: 804
Process chunk 27: 427
Write chunk 27 to D:\P.dat: 534
Read chunk 28 from G:\A.dat: 948
Read chunk 28 from D:\P.dat: 849
Process chunk 28: 425
Write chunk 28 to D:\P.dat: 558
Read chunk 29 from G:\A.dat: 968
Read chunk 29 from D:\P.dat: 923
Process chunk 29: 426
Write chunk 29 to D:\P.dat: 584
Read chunk 30 from G:\A.dat: 992
Read chunk 30 from D:\P.dat: 909
Process chunk 30: 425
Write chunk 30 to D:\P.dat: 640
Read chunk 31 from G:\A.dat: 993
Read chunk 31 from D:\P.dat: 789
Process chunk 31: 426
Write chunk 31 to D:\P.dat: 656
Total time: 90088
Wersja bez watkow symulujaca wersje z watkami
Read chunk 0 from G:\A.dat: 1190
Read chunk 0 from D:\P.dat: 864
Process chunk 0: 428
Read chunk 1 from G:\A.dat: 897
Read chunk 1 from D:\P.dat: 809
Process chunk 1: 456
Write chunk 0 to D:\P.dat: 578
Read chunk 2 from G:\A.dat: 994
Read chunk 2 from D:\P.dat: 736
Process chunk 2: 427
Write chunk 1 to D:\P.dat: 538
Read chunk 3 from G:\A.dat: 986
Read chunk 3 from D:\P.dat: 828
Process chunk 3: 426
Write chunk 2 to D:\P.dat: 557
Read chunk 4 from G:\A.dat: 995
Read chunk 4 from D:\P.dat: 827
Process chunk 4: 426
Write chunk 3 to D:\P.dat: 671
Read chunk 5 from G:\A.dat: 955
Read chunk 5 from D:\P.dat: 824
Process chunk 5: 427
Write chunk 4 to D:\P.dat: 577
Read chunk 6 from G:\A.dat: 970
Read chunk 6 from D:\P.dat: 719
Process chunk 6: 426
Write chunk 5 to D:\P.dat: 596
Read chunk 7 from G:\A.dat: 1003
Read chunk 7 from D:\P.dat: 754
Process chunk 7: 426
Write chunk 6 to D:\P.dat: 529
Read chunk 8 from G:\A.dat: 1019
Read chunk 8 from D:\P.dat: 771
Process chunk 8: 426
Write chunk 7 to D:\P.dat: 562
Read chunk 9 from G:\A.dat: 999
Read chunk 9 from D:\P.dat: 753
Process chunk 9: 426
Write chunk 8 to D:\P.dat: 567
Read chunk 10 from G:\A.dat: 945
Read chunk 10 from D:\P.dat: 753
Process chunk 10: 427
Write chunk 9 to D:\P.dat: 553
Read chunk 11 from G:\A.dat: 944
Read chunk 11 from D:\P.dat: 748
Process chunk 11: 426
Write chunk 10 to D:\P.dat: 527
Read chunk 12 from G:\A.dat: 996
Read chunk 12 from D:\P.dat: 807
Process chunk 12: 429
Write chunk 11 to D:\P.dat: 551
Read chunk 13 from G:\A.dat: 995
Read chunk 13 from D:\P.dat: 823
Process chunk 13: 426
Write chunk 12 to D:\P.dat: 575
Read chunk 14 from G:\A.dat: 994
Read chunk 14 from D:\P.dat: 791
Process chunk 14: 427
Write chunk 13 to D:\P.dat: 604
Read chunk 15 from G:\A.dat: 1043
Read chunk 15 from D:\P.dat: 761
Process chunk 15: 426
Write chunk 14 to D:\P.dat: 550
Read chunk 16 from G:\A.dat: 1138
Read chunk 16 from D:\P.dat: 827
Process chunk 16: 427
Write chunk 15 to D:\P.dat: 548
Read chunk 17 from G:\A.dat: 1082
Read chunk 17 from D:\P.dat: 836
Process chunk 17: 426
Write chunk 16 to D:\P.dat: 576
Read chunk 18 from G:\A.dat: 993
Read chunk 18 from D:\P.dat: 815
Process chunk 18: 428
Write chunk 17 to D:\P.dat: 559
Read chunk 19 from G:\A.dat: 1230
Read chunk 19 from D:\P.dat: 816
Process chunk 19: 426
Write chunk 18 to D:\P.dat: 546
Read chunk 20 from G:\A.dat: 897
Read chunk 20 from D:\P.dat: 854
Process chunk 20: 429
Write chunk 19 to D:\P.dat: 626
Read chunk 21 from G:\A.dat: 995
Read chunk 21 from D:\P.dat: 830
Process chunk 21: 426
Write chunk 20 to D:\P.dat: 586
Read chunk 22 from G:\A.dat: 1130
Read chunk 22 from D:\P.dat: 828
Process chunk 22: 427
Write chunk 21 to D:\P.dat: 599
Read chunk 23 from G:\A.dat: 1105
Read chunk 23 from D:\P.dat: 742
Process chunk 23: 428
Write chunk 22 to D:\P.dat: 620
Read chunk 24 from G:\A.dat: 984
Read chunk 24 from D:\P.dat: 771
Process chunk 24: 427
Write chunk 23 to D:\P.dat: 531
Read chunk 25 from G:\A.dat: 1018
Read chunk 25 from D:\P.dat: 847
Process chunk 25: 426
Write chunk 24 to D:\P.dat: 569
Read chunk 26 from G:\A.dat: 997
Read chunk 26 from D:\P.dat: 760
Process chunk 26: 427
Write chunk 25 to D:\P.dat: 584
Read chunk 27 from G:\A.dat: 1002
Read chunk 27 from D:\P.dat: 812
Process chunk 27: 426
Write chunk 26 to D:\P.dat: 539
Read chunk 28 from G:\A.dat: 960
Read chunk 28 from D:\P.dat: 832
Process chunk 28: 427
Write chunk 27 to D:\P.dat: 546
Read chunk 29 from G:\A.dat: 959
Read chunk 29 from D:\P.dat: 857
Process chunk 29: 426
Write chunk 28 to D:\P.dat: 586
Read chunk 30 from G:\A.dat: 997
Read chunk 30 from D:\P.dat: 905
Process chunk 30: 426
Write chunk 29 to D:\P.dat: 591
Read chunk 31 from G:\A.dat: 991
Read chunk 31 from D:\P.dat: 854
Process chunk 31: 426
Write chunk 30 to D:\P.dat: 631
Write chunk 31 to D:\P.dat: 589
Total time: 90204
Wersja z watkami
Read chunk 0 from G:\A.dat: 1281
Read chunk 0 from D:\P.dat: 1295
Process chunk 0: 425
Read chunk 1 from G:\A.dat: 933
Read chunk 1 from D:\P.dat: 984
Process chunk 1: 428
Write chunk 0 to D:\P.dat: 694
Read chunk 2 from G:\A.dat: 1063
Read chunk 2 from D:\P.dat: 1064
Process chunk 2: 427
Write chunk 1 to D:\P.dat: 534
Read chunk 3 from G:\A.dat: 1069
Read chunk 3 from D:\P.dat: 1123
Process chunk 3: 427
Write chunk 2 to D:\P.dat: 652
Read chunk 4 from G:\A.dat: 1044
Read chunk 4 from D:\P.dat: 1089
Process chunk 4: 428
Write chunk 3 to D:\P.dat: 679
Read chunk 5 from G:\A.dat: 1031
Read chunk 5 from D:\P.dat: 1077
Process chunk 5: 429
Write chunk 4 to D:\P.dat: 642
Read chunk 6 from D:\P.dat: 1051
Read chunk 6 from G:\A.dat: 1053
Process chunk 6: 428
Write chunk 5 to D:\P.dat: 607
Read chunk 7 from G:\A.dat: 1032
Read chunk 7 from D:\P.dat: 1080
Process chunk 7: 428
Write chunk 6 to D:\P.dat: 581
Read chunk 8 from G:\A.dat: 1055
Read chunk 8 from D:\P.dat: 1099
Process chunk 8: 429
Write chunk 7 to D:\P.dat: 663
Read chunk 9 from G:\A.dat: 1055
Read chunk 9 from D:\P.dat: 1149
Process chunk 9: 427
Write chunk 8 to D:\P.dat: 678
Read chunk 10 from G:\A.dat: 1017
Read chunk 10 from D:\P.dat: 1085
Process chunk 10: 427
Write chunk 9 to D:\P.dat: 623
Read chunk 11 from G:\A.dat: 1013
Read chunk 11 from D:\P.dat: 1014
Process chunk 11: 427
Write chunk 10 to D:\P.dat: 679
Read chunk 12 from G:\A.dat: 1067
Read chunk 12 from D:\P.dat: 1124
Process chunk 12: 429
Write chunk 11 to D:\P.dat: 770
Read chunk 13 from D:\P.dat: 1055
Read chunk 13 from G:\A.dat: 1057
Process chunk 13: 429
Write chunk 12 to D:\P.dat: 604
Read chunk 14 from G:\A.dat: 1072
Read chunk 14 from D:\P.dat: 1108
Process chunk 14: 429
Write chunk 13 to D:\P.dat: 679
Read chunk 15 from G:\A.dat: 1127
Read chunk 15 from D:\P.dat: 1212
Process chunk 15: 428
Write chunk 14 to D:\P.dat: 698
Read chunk 16 from G:\A.dat: 1203
Read chunk 16 from D:\P.dat: 1204
Process chunk 16: 428
Write chunk 15 to D:\P.dat: 581
Read chunk 17 from G:\A.dat: 1115
Read chunk 17 from D:\P.dat: 1171
Process chunk 17: 428
Write chunk 16 to D:\P.dat: 688
Read chunk 18 from G:\A.dat: 1052
Read chunk 18 from D:\P.dat: 1101
Process chunk 18: 427
Write chunk 17 to D:\P.dat: 705
Read chunk 19 from D:\P.dat: 1087
Read chunk 19 from G:\A.dat: 1090
Process chunk 19: 428
Write chunk 18 to D:\P.dat: 586
Read chunk 20 from G:\A.dat: 1057
Read chunk 20 from D:\P.dat: 1126
Process chunk 20: 427
Write chunk 19 to D:\P.dat: 627
Read chunk 21 from G:\A.dat: 1086
Read chunk 21 from D:\P.dat: 1130
Process chunk 21: 428
Write chunk 20 to D:\P.dat: 768
Read chunk 22 from G:\A.dat: 1177
Read chunk 22 from D:\P.dat: 1178
Process chunk 22: 426
Write chunk 21 to D:\P.dat: 666
Read chunk 23 from G:\A.dat: 1178
Read chunk 23 from D:\P.dat: 1230
Process chunk 23: 427
Write chunk 22 to D:\P.dat: 696
Read chunk 24 from G:\A.dat: 1038
Read chunk 24 from D:\P.dat: 1096
Process chunk 24: 428
Write chunk 23 to D:\P.dat: 756
Read chunk 25 from D:\P.dat: 1041
Read chunk 25 from G:\A.dat: 1043
Process chunk 25: 429
Write chunk 24 to D:\P.dat: 604
Read chunk 26 from G:\A.dat: 1004
Read chunk 26 from D:\P.dat: 1110
Process chunk 26: 428
Write chunk 25 to D:\P.dat: 664
Read chunk 27 from G:\A.dat: 1040
Read chunk 27 from D:\P.dat: 1094
Process chunk 27: 428
Write chunk 26 to D:\P.dat: 966
Read chunk 28 from G:\A.dat: 1020
Read chunk 28 from D:\P.dat: 1025
Process chunk 28: 427
Write chunk 27 to D:\P.dat: 555
Read chunk 29 from G:\A.dat: 1055
Read chunk 29 from D:\P.dat: 1150
Process chunk 29: 428
Write chunk 28 to D:\P.dat: 623
Read chunk 30 from G:\A.dat: 1077
Read chunk 30 from D:\P.dat: 1124
Process chunk 30: 427
Write chunk 29 to D:\P.dat: 771
Read chunk 31 from G:\A.dat: 1086
Read chunk 31 from D:\P.dat: 1088
Process chunk 31: 428
Write chunk 30 to D:\P.dat: 659
Write chunk 31 to D:\P.dat: 547
Total time: 57286
STOP
START
Wersja bez watkow intuicyjna
Read chunk 0 from G:\A.dat: 1199
Read chunk 0 from D:\P.dat: 875
Process chunk 0: 446
Write chunk 0 to D:\P.dat: 549
Read chunk 1 from G:\A.dat: 895
Read chunk 1 from D:\P.dat: 666
Process chunk 1: 427
Write chunk 1 to D:\P.dat: 540
Read chunk 2 from G:\A.dat: 996
Read chunk 2 from D:\P.dat: 742
Process chunk 2: 427
Write chunk 2 to D:\P.dat: 529
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Total time: 90050
Wersja bez watkow symulujaca wersje z watkami
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Process chunk 0: 426
Read chunk 1 from G:\A.dat: 930
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Read chunk 3 from G:\A.dat: 997
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Read chunk 4 from G:\A.dat: 980
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Read chunk 5 from G:\A.dat: 955
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Read chunk 6 from G:\A.dat: 996
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Read chunk 7 from G:\A.dat: 975
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Read chunk 8 from G:\A.dat: 1024
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Read chunk 9 from G:\A.dat: 1025
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Read chunk 20 from G:\A.dat: 885
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Read chunk 21 from G:\A.dat: 998
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Read chunk 24 from G:\A.dat: 977
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Read chunk 25 from G:\A.dat: 990
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Read chunk 31 from D:\P.dat: 771
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Write chunk 30 to D:\P.dat: 631
Write chunk 31 to D:\P.dat: 548
Total time: 90348
Wersja z watkami
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Read chunk 0 from G:\A.dat: 1255
Process chunk 0: 426
Read chunk 1 from G:\A.dat: 925
Read chunk 1 from D:\P.dat: 1012
Process chunk 1: 425
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Write chunk 1 to D:\P.dat: 574
Read chunk 3 from G:\A.dat: 1094
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Process chunk 3: 424
Write chunk 2 to D:\P.dat: 560
Read chunk 4 from G:\A.dat: 1040
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Process chunk 4: 428
Write chunk 3 to D:\P.dat: 569
Read chunk 5 from D:\P.dat: 1007
Read chunk 5 from G:\A.dat: 1009
Process chunk 5: 424
Write chunk 4 to D:\P.dat: 640
Read chunk 6 from G:\A.dat: 1030
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Process chunk 6: 428
Write chunk 5 to D:\P.dat: 653
Read chunk 7 from G:\A.dat: 1052
Read chunk 7 from D:\P.dat: 1113
Process chunk 7: 425
Write chunk 6 to D:\P.dat: 603
Read chunk 8 from G:\A.dat: 1065
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Process chunk 8: 430
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Read chunk 9 from D:\P.dat: 1051
Read chunk 9 from G:\A.dat: 1053
Process chunk 9: 425
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Read chunk 10 from G:\A.dat: 1000
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Read chunk 11 from G:\A.dat: 989
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Read chunk 12 from G:\A.dat: 1067
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Process chunk 12: 429
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Read chunk 13 from G:\A.dat: 1084
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Read chunk 14 from G:\A.dat: 1043
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Read chunk 15 from G:\A.dat: 1119
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Read chunk 16 from G:\A.dat: 1174
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Read chunk 17 from G:\A.dat: 1106
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Read chunk 18 from G:\A.dat: 1037
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Read chunk 19 from D:\P.dat: 1001
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Read chunk 20 from G:\A.dat: 1006
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Read chunk 22 from G:\A.dat: 1154
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Read chunk 23 from G:\A.dat: 1164
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Read chunk 24 from G:\A.dat: 1039
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Read chunk 25 from D:\P.dat: 1076
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Read chunk 29 from G:\A.dat: 1028
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Read chunk 30 from G:\A.dat: 1051
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Process chunk 30: 428
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Read chunk 31 from G:\A.dat: 1082
Read chunk 31 from D:\P.dat: 1134
Process chunk 31: 424
Write chunk 30 to D:\P.dat: 736
Write chunk 31 to D:\P.dat: 583
Total time: 56449
STOP
START
Wersja bez watkow intuicyjna
Read chunk 0 from G:\A.dat: 2596
Read chunk 0 from D:\P.dat: 1688
Process chunk 0: 910
Write chunk 0 to D:\P.dat: 1377
Read chunk 1 from G:\A.dat: 1910
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Process chunk 1: 846
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Read chunk 2 from G:\A.dat: 1939
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Read chunk 3 from G:\A.dat: 1990
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Read chunk 4 from G:\A.dat: 2022
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Read chunk 5 from G:\A.dat: 1933
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Read chunk 6 from G:\A.dat: 2000
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Read chunk 7 from G:\A.dat: 2929
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Read chunk 8 from G:\A.dat: 2198
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Read chunk 9 from G:\A.dat: 2043
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Read chunk 10 from G:\A.dat: 2023
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Read chunk 11 from G:\A.dat: 2227
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Read chunk 12 from G:\A.dat: 2013
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Read chunk 13 from G:\A.dat: 2009
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Read chunk 14 from G:\A.dat: 1929
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Read chunk 15 from G:\A.dat: 2005
Read chunk 15 from D:\P.dat: 1619
Process chunk 15: 847
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Total time: 94401
Wersja bez watkow symulujaca wersje z watkami
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Read chunk 0 from D:\P.dat: 1684
Process chunk 0: 847
Read chunk 1 from G:\A.dat: 1949
Read chunk 1 from D:\P.dat: 1505
Process chunk 1: 907
Write chunk 0 to D:\P.dat: 1271
Read chunk 2 from G:\A.dat: 1963
Read chunk 2 from D:\P.dat: 1634
Process chunk 2: 850
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Read chunk 3 from G:\A.dat: 2023
Read chunk 3 from D:\P.dat: 1587
Process chunk 3: 844
Write chunk 2 to D:\P.dat: 1363
Read chunk 4 from G:\A.dat: 2016
Read chunk 4 from D:\P.dat: 1573
Process chunk 4: 846
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Read chunk 5 from G:\A.dat: 1940
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Process chunk 5: 847
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Read chunk 6 from G:\A.dat: 2004
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Process chunk 6: 847
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Read chunk 7 from G:\A.dat: 2273
Read chunk 7 from D:\P.dat: 1528
Process chunk 7: 845
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Read chunk 8 from G:\A.dat: 2187
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Process chunk 8: 847
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Read chunk 9 from G:\A.dat: 2029
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Process chunk 9: 845
Write chunk 8 to D:\P.dat: 1300
Read chunk 10 from G:\A.dat: 2025
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Process chunk 10: 846
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Read chunk 11 from G:\A.dat: 2221
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Read chunk 12 from G:\A.dat: 2014
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Read chunk 13 from G:\A.dat: 2015
Read chunk 13 from D:\P.dat: 1570
Process chunk 13: 844
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Read chunk 14 from G:\A.dat: 1928
Read chunk 14 from D:\P.dat: 1597
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Read chunk 15 from G:\A.dat: 2019
Read chunk 15 from D:\P.dat: 1620
Process chunk 15: 846
Write chunk 14 to D:\P.dat: 1299
Write chunk 15 to D:\P.dat: 1352
Total time: 92628
Wersja z watkami
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Read chunk 0 from D:\P.dat: 2315
Process chunk 0: 848
Read chunk 1 from D:\P.dat: 1978
Read chunk 1 from G:\A.dat: 1985
Process chunk 1: 850
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Read chunk 2 from G:\A.dat: 2079
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Process chunk 2: 851
Write chunk 1 to D:\P.dat: 1266
Read chunk 3 from D:\P.dat: 2093
Read chunk 3 from G:\A.dat: 2107
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Read chunk 4 from G:\A.dat: 2126
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Write chunk 3 to D:\P.dat: 1345
Read chunk 5 from D:\P.dat: 2031
Read chunk 5 from G:\A.dat: 2037
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Read chunk 6 from G:\A.dat: 2116
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Process chunk 6: 849
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Read chunk 7 from G:\A.dat: 2140
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Process chunk 7: 848
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Read chunk 8 from G:\A.dat: 2273
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Read chunk 9 from G:\A.dat: 2135
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Read chunk 10 from G:\A.dat: 2127
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Read chunk 11 from G:\A.dat: 2325
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Read chunk 12 from G:\A.dat: 2099
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Read chunk 13 from G:\A.dat: 2125
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Read chunk 14 from D:\P.dat: 2062
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Read chunk 15 from G:\A.dat: 2144
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Process chunk 15: 849
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Total time: 56772
STOP
START
Wersja bez watkow intuicyjna
Read chunk 0 from G:\A.dat: 2339
Read chunk 0 from D:\P.dat: 1638
Process chunk 0: 883
Write chunk 0 to D:\P.dat: 1310
Read chunk 1 from G:\A.dat: 1887
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Read chunk 2 from G:\A.dat: 2018
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Read chunk 3 from G:\A.dat: 1992
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Read chunk 4 from G:\A.dat: 2030
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Read chunk 5 from G:\A.dat: 1942
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Read chunk 6 from G:\A.dat: 2010
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Read chunk 7 from G:\A.dat: 2051
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Read chunk 8 from G:\A.dat: 2169
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Read chunk 9 from G:\A.dat: 2030
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Read chunk 10 from G:\A.dat: 2008
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Read chunk 11 from G:\A.dat: 2215
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Read chunk 12 from G:\A.dat: 2028
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Read chunk 13 from G:\A.dat: 2010
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Total time: 92305
Wersja bez watkow symulujaca wersje z watkami
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Read chunk 0 from D:\P.dat: 1668
Process chunk 0: 853
Read chunk 1 from G:\A.dat: 1948
Read chunk 1 from D:\P.dat: 1474
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Read chunk 2 from G:\A.dat: 1960
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Read chunk 3 from G:\A.dat: 2017
Read chunk 3 from D:\P.dat: 1525
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Read chunk 4 from G:\A.dat: 2020
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Process chunk 4: 853
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Read chunk 5 from G:\A.dat: 1957
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Read chunk 6 from G:\A.dat: 2018
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Read chunk 7 from G:\A.dat: 2064
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Process chunk 8: 854
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Process chunk 9: 845
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Read chunk 10 from G:\A.dat: 2003
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Process chunk 11: 845
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Read chunk 12 from G:\A.dat: 2001
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Process chunk 12: 853
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Read chunk 13 from G:\A.dat: 2004
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Process chunk 13: 845
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Read chunk 14 from G:\A.dat: 1936
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Read chunk 15 from G:\A.dat: 2030
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Process chunk 15: 845
Write chunk 14 to D:\P.dat: 1317
Write chunk 15 to D:\P.dat: 1348
Total time: 92542
Wersja z watkami
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Process chunk 0: 852
Read chunk 1 from G:\A.dat: 2019
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Process chunk 1: 850
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Read chunk 2 from G:\A.dat: 2073
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Process chunk 2: 858
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Process chunk 3: 849
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Process chunk 5: 849
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Process chunk 7: 850
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Process chunk 8: 857
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Process chunk 10: 856
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Process chunk 12: 856
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Read chunk 13 from G:\A.dat: 2143
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Process chunk 13: 850
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Read chunk 14 from D:\P.dat: 2060
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Process chunk 14: 857
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Read chunk 15 from G:\A.dat: 2152
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Process chunk 15: 850
Write chunk 14 to D:\P.dat: 1298
Write chunk 15 to D:\P.dat: 1450
Total time: 56981
STOP