mirror of
https://github.com/mongodb/mongo.git
synced 2024-11-30 00:56:44 +01:00
135 lines
4.1 KiB
C++
135 lines
4.1 KiB
C++
#include "stdafx.h"
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#include <stdio.h>
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#include "../util/goodies.h"
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#include <fcntl.h>
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namespace mongo {
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#if defined(F_FULLFSYNC)
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void fullsync(int f) {
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fcntl( f, F_FULLFSYNC );
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}
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#else
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void fullsync(int f) {
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fdatasync(f);
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}
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#endif
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int main(int argc, char* argv[], char *envp[] ) {
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cout << "hello" << endl;
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FILE *f = fopen("/data/db/temptest", "a");
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if ( f == 0 ) {
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cout << "can't open file\n";
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return 1;
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}
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{
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Timer t;
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for ( int i = 0; i < 50000; i++ )
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fwrite("abc", 3, 1, f);
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cout << "small writes: " << t.millis() << "ms" << endl;
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}
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{
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Timer t;
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for ( int i = 0; i < 10000; i++ ) {
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fwrite("abc", 3, 1, f);
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fflush(f);
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fsync( fileno( f ) );
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}
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int ms = t.millis();
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cout << "flush: " << ms << "ms, " << ms / 10000.0 << "ms/request" << endl;
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}
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{
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Timer t;
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for ( int i = 0; i < 500; i++ ) {
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fwrite("abc", 3, 1, f);
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fflush(f);
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fsync( fileno( f ) );
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sleepmillis(2);
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}
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int ms = t.millis() - 500 * 2;
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cout << "flush with sleeps: " << ms << "ms, " << ms / 500.0 << "ms/request" << endl;
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}
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char buf[8192];
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for ( int pass = 0; pass < 2; pass++ ) {
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cout << "pass " << pass << endl;
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{
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Timer t;
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int n = 500;
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for ( int i = 0; i < n; i++ ) {
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if ( pass == 0 )
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fwrite("abc", 3, 1, f);
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else
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fwrite(buf, 8192, 1, f);
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buf[0]++;
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fflush(f);
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fullsync(fileno(f));
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}
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int ms = t.millis();
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cout << "fullsync: " << ms << "ms, " << ms / ((double) n) << "ms/request" << endl;
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}
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{
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Timer t;
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for ( int i = 0; i < 500; i++ ) {
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if ( pass == 0 )
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fwrite("abc", 3, 1, f);
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else
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fwrite(buf, 8192, 1, f);
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buf[0]++;
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fflush(f);
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fullsync(fileno(f));
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sleepmillis(2);
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}
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int ms = t.millis() - 2 * 500;
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cout << "fullsync with sleeps: " << ms << "ms, " << ms / 500.0 << "ms/request" << endl;
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}
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}
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// without growing
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{
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fclose(f);
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/* try from beginning of the file, where we aren't appending and changing the file length,
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to see if this is faster as the directory entry then doesn't have to be flushed (if noatime in effect).
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*/
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f = fopen("/data/db/temptest", "r+");
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Timer t;
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int n = 500;
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for ( int i = 0; i < n; i++ ) {
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fwrite("xyz", 3, 1, f);
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fflush(f);
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fullsync(fileno(f));
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}
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int ms = t.millis();
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cout << "fullsync without growing: " << ms << "ms, " << ms / ((double) n) << "ms/request" << endl;
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}
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// without growing, with delay
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{
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fclose(f);
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/* try from beginning of the file, where we aren't appending and changing the file length,
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to see if this is faster as the directory entry then doesn't have to be flushed (if noatime in effect).
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*/
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f = fopen("/data/db/temptest", "r+");
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Timer t;
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int n = 500;
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for ( int i = 0; i < n; i++ ) {
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fwrite("xyz", 3, 1, f);
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fflush(f);
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fullsync(fileno(f));
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sleepmillis(2);
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}
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int ms = t.millis() - 2 * 500;
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cout << "fullsync without growing with sleeps: " << ms << "ms, " << ms / ((double) n) << "ms/request" << endl;
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}
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return 0;
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}
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} // namespace mongo
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