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Code Issues Releases Activity

more flushtest

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yellow 2009-01-04 19:13:51 +00:00
parent a4c7aae14c
commit b726cbeed5
1 changed files with 28 additions and 9 deletions
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33
db/flushtest.cpp
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@ -47,10 +47,10 @@ int main(int argc, char* argv[], char *envp[] ) {
fwrite("abc", 3, 1, f);
fflush(f);
fsync( fileno( f ) );
sleepmillis(10);
sleepmillis(2);
}
int ms = t.millis();
cout << "flush with sleeps intermixed: " << ms << "ms, " << (ms-5000) / 500.0 << "ms/request" << endl;
int ms = t.millis() - 500 * 2;
cout << "flush with sleeps: " << ms << "ms, " << ms / 500.0 << "ms/request" << endl;
}
char buf[8192];
@ -82,14 +82,14 @@ int main(int argc, char* argv[], char *envp[] ) {
buf[0]++;
fflush(f);
fullsync(fileno(f));
sleepmillis(10);
sleepmillis(2);
}
int ms = t.millis();
cout << "fullsync with sleeps intermixed: " << ms << "ms, " << (ms-5000) / 500.0 << "ms/request" << endl;
int ms = t.millis() - 2 * 500;
cout << "fullsync with sleeps: " << ms << "ms, " << ms / 500.0 << "ms/request" << endl;
}
}
// with noatime
// without growing
{
fclose(f);
/* try from beginning of the file, where we aren't appending and changing the file length,
@ -107,5 +107,24 @@ int main(int argc, char* argv[], char *envp[] ) {
cout << "fullsync without growing: " << ms << "ms, " << ms / ((double) n) << "ms/request" << endl;
}
// without growing, with delay
{
fclose(f);
/* try from beginning of the file, where we aren't appending and changing the file length,
to see if this is faster as the directory entry then doesn't have to be flushed (if noatime in effect).
*/
f = fopen("/data/db/temptest", "r+");
Timer t;
int n = 500;
for( int i = 0; i < n; i++ ) {
fwrite("xyz", 3, 1, f);
fflush(f);
fullsync(fileno(f));
sleepmillis(2);
}
int ms = t.millis() - 2 * 500;
cout << "fullsync without growing with sleeps: " << ms << "ms, " << ms / ((double) n) << "ms/request" << endl;
}
return 0;
}