int run() {
if (isMongos()) {
toolError() << "mongotop only works on instances of mongod." << std::endl;
return EXIT_FAILURE;
}
NamespaceStats prev = getData();
while ( true ) {
sleepsecs(mongoTopGlobalParams.sleep);
NamespaceStats now;
try {
now = getData();
}
catch ( std::exception& e ) {
toolError() << "can't get data: " << e.what() << std::endl;
continue;
}
if ( now.size() == 0 )
return -2;
try {
printDiff( prev , now );
}
catch ( AssertionException& e ) {
toolError() << "\nerror: " << e.what() << std::endl;
}
prev = now;
}
return 0;
}
void printDiff( const NamespaceStats& prev , const NamespaceStats& now ) {
if ( prev.size() == 0 || now.size() == 0 ) {
cout << "." << endl;
return;
}
vector<NamespaceDiff> data = StatUtil::computeDiff( prev , now );
unsigned longest = 30;
for ( unsigned i=0; i < data.size(); i++ ) {
const string& ns = data[i].ns;
if ( ! useLocks() && ns.find( '.' ) == string::npos )
continue;
if ( ns.size() > longest )
longest = ns.size();
}
int numberWidth = 10;
cout << "\n"
<< setw(longest) << ( useLocks() ? "db" : "ns" )
<< setw(numberWidth+2) << "total"
<< setw(numberWidth+2) << "read"
<< setw(numberWidth+2) << "write"
<< "\t\t" << terseCurrentTime()
<< endl;
for ( int i=data.size()-1; i>=0 && data.size() - i < 10 ; i-- ) {
if ( ! useLocks() && data[i].ns.find( '.' ) == string::npos )
continue;
cout << setw(longest) << data[i].ns
<< setw(numberWidth) << setprecision(3) << data[i].total() << "ms"
<< setw(numberWidth) << setprecision(3) << data[i].read << "ms"
<< setw(numberWidth) << setprecision(3) << data[i].write << "ms"
<< endl;
}
}
vector<NamespaceDiff> StatUtil::computeDiff( const NamespaceStats& prev , const NamespaceStats& current ) {
vector<NamespaceDiff> data;
for ( NamespaceStats::const_iterator i = current.begin() ; i != current.end(); ++i ) {
const string& ns = i->first;
const NamespaceInfo& b = i->second;
if ( prev.find( ns ) == prev.end() )
continue;
const NamespaceInfo& a = prev.find( ns )->second;
// invalid, data fixed in 1.8.0
if ( ns[0] == '?' )
continue;
data.push_back( NamespaceDiff( a , b ) );
}
std::sort( data.begin() , data.end() );
return data;
}