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// @file mmaptests.cpp
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pch.h"
#include "../util/mmap.h"
#include "dbtests.h"
namespace MMapTests {
#if 0
class CopyOnWriteSpeedTest {
public:
void run() {
string fn = "/tmp/testfile.map";
boost::filesystem::remove(fn);
MemoryMappedFile f;
char *p = (char *) f.create(fn, 1024 * 1024 * 1024, true);
assert(p);
strcpy(p, "hello");
{
void *x = f.testGetCopyOnWriteView();
Timer tt;
for( int i = 11; i < 1000000000; i++ )
p[i] = 'z';
cout << "fill 1GB time: " << tt.millis() << "ms" << endl;
f.testCloseCopyOnWriteView(x);
}
/* test a lot of view/unviews */
{
Timer t;
char *q;
for( int i = 0; i < 1000; i++ ) {
q = (char *) f.testGetCopyOnWriteView();
assert( q );
if( i == 999 ) {
strcpy(q+2, "there");
}
f.testCloseCopyOnWriteView(q);
}
cout << "view unview: " << t.millis() << "ms" << endl;
}
f.flush(true);
/* plain old mmaped writes */
{
Timer t;
for( int i = 0; i < 10; i++ ) {
memset(p+100, 'c', 200 * 1024 * 1024);
}
cout << "traditional writes: " << t.millis() << "ms" << endl;
}
f.flush(true);
/* test doing some writes */
{
Timer t;
char *q = (char *) f.testGetCopyOnWriteView();
for( int i = 0; i < 10; i++ ) {
assert( q );
memset(q+100, 'c', 200 * 1024 * 1024);
}
f.testCloseCopyOnWriteView(q);
cout << "inc style some writes: " << t.millis() << "ms" << endl;
}
/* test doing some writes */
{
Timer t;
for( int i = 0; i < 10; i++ ) {
char *q = (char *) f.testGetCopyOnWriteView();
assert( q );
memset(q+100, 'c', 200 * 1024 * 1024);
f.testCloseCopyOnWriteView(q);
}
cout << "some writes: " << t.millis() << "ms" << endl;
}
/* more granular */
{
Timer t;
for( int i = 0; i < 100; i++ ) {
char *q = (char *) f.testGetCopyOnWriteView();
assert( q );
memset(q+100, 'c', 20 * 1024 * 1024);
f.testCloseCopyOnWriteView(q);
}
cout << "more granular some writes: " << t.millis() << "ms" << endl;
}
p[10] = 0;
cout << p << endl;
}
};
class All : public Suite {
public:
All() : Suite( "mmap" ){}
void setupTests(){
add< CopyOnWriteSpeedTest >();
}
} myall;
#endif
}
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