mongodb/jstests/core/bench_test3.js

t = db.bench_test3;
t.drop();


benchArgs = { ops : [ { ns : t.getFullName() ,
                        op : "update" ,
                        upsert : true ,
                        query : { _id : { "#RAND_INT" : [ 0 , 5 , 4 ] } } ,
                        update : { $inc : { x : 1 } } } ] ,
              parallel : 2 ,
              seconds : 5 ,
              host : db.getMongo().host };

if (jsTest.options().auth) {
    benchArgs['db'] = 'admin';
    benchArgs['username'] = jsTest.options().adminUser;
    benchArgs['password'] = jsTest.options().adminPassword;
}

res = benchRun( benchArgs );
printjson( res );

var keys = [];
var totals = {};
db.bench_test3.find().sort( { _id : 1 } ).forEach( function(z){ keys.push( z._id ); totals[z._id] = z.x; } );
printjson(totals);
assert.eq( [ 0 , 4 , 8 , 12 , 16 ] , keys );